An automatic cleaning landfill leachate nanofiltration concentrate reduction system

Abstract

The present invention discloses an automatic cleaning landfill leachate nanofiltration concentrate reduction system, comprising: a control component, a concentration reduction component, a cleaning component and a collection component; the control end of the control component is respectively connected to the control end of the concentration reduction component, the control end of the cleaning component and the control end of the collection component; the cleaning component is connected to the concentration reduction component pipeline; the collection component is used to collect the real-time operation data of the concentration reduction component, and send the real-time operation data to the control component; the control component is used to compare the real-time operation data with a preset operation data threshold, and judge whether the concentrate reduction system needs to be cleaned according to the comparison result, when it is judged that the concentrate reduction system needs to be cleaned, when the concentration reduction component stops working, the cleaning component is turned on to clean the concentrate reduction system. The present invention realizes the online cleaning of the nanofiltration concentrate reduction system, avoids the membrane component from being hoisted out for offline cleaning, and reduces the occurrence of broken wires.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment, and in particular to an automatic cleaning garbage leachate nanofiltration concentrate reduction system. Background Art

[0002] In the field of landfill leachate treatment, the combined process of "pretreatment + biological treatment + deep treatment" is currently widely used. Deep treatment is generally a nanofiltration or reverse osmosis treatment process. Although it can ensure that the effluent meets the discharge standards, since nanofiltration and reverse osmosis only play a role in physical filtration, while the clear liquid meets the standards, 20-30% volume of membrane filtration concentrate will be produced. The nanofiltration concentrate is enriched with most of the divalent salts in the leachate and organic matter such as humic acid that is difficult to biodegrade or cannot be biodegraded.

[0003] Improving the overall water recovery rate of the landfill leachate treatment system is an industry goal for landfill leachate treatment, and nanofiltration and reverse osmosis concentrate treatment is an industry challenge for landfill leachate treatment. The main treatment methods for nanofiltration concentrate include reinjection method, membrane concentration reduction method, evaporation-drying method, coagulation precipitation-advanced oxidation method, electrochemical oxidation method, etc.

[0004] The two-stage material separation membrane reduction process in the nanofiltration concentrate membrane concentration reduction method is currently the most advanced treatment process, with low investment and operating costs, high reduction degree, and can greatly improve the recovery rate of water treated by nanofiltration. Compared with other methods, it has the advantages of high efficiency, low energy consumption, simple process, and small footprint. It has gradually been applied in the field of landfill leachate nanofiltration concentrate treatment and achieved good results.

[0005] However, the two-stage material separation membrane is still a physical filter. The huge challenge faced by the two-stage material separation membrane reduction technology is the membrane pollution problem. During the operation, there are various forms of substances that can cause surface contamination of the material separation membrane, such as hydrated metal oxides, calcium-containing precipitates, humic acid and other organic matter. Various sediments covering the membrane surface will block the membrane pores, reduce membrane flux, shorten the service life of the membrane, increase energy consumption and operating costs. At the same time, due to the high purchase cost of the two-stage material separation membrane components, the operation and maintenance and cleaning requirements are high. Improper operation and maintenance cleaning can easily shorten the service life of the material separation membrane components. Summary of the invention

[0006] The present invention provides an automatic cleaning landfill leachate nanofiltration concentrate reduction system, which is used to solve the technical problems that the existing automatic cleaning landfill leachate nanofiltration concentrate reduction system has high requirements for operation and maintenance and cleaning, and improper operation and maintenance and cleaning can easily lead to a shortened service life of material separation membrane components.

[0007] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0008] An automatic cleaning landfill leachate nanofiltration concentrate reduction system comprises: a control component, a concentration reduction component, a cleaning component and a collection component; the control end of the control component is respectively connected to the control end of the concentration reduction component, the control end of the cleaning component and the control end of the collection component; the cleaning component is connected to the concentration reduction component through a pipeline; the collection component is used to collect real-time operation data of the concentration reduction component and send the real-time operation data to the control component;

[0009] The control component is used to compare the real-time operation data with a preset operation data threshold, and determine whether the concentrate reduction system needs to be cleaned according to the comparison result. When it is determined that the concentrate reduction system needs to be cleaned, any of the following steps is performed:

[0010] A. Sending a cleaning prompt message to the user, prompting the user to select whether to clean, receiving and starting the cleaning component to clean the concentrate reduction system according to the cleaning instruction sent by the user;

[0011] B. When the concentration and reduction component stops working, the cleaning component is turned on to clean the concentrate reduction system.

[0012] Preferably, the concentration and reduction component comprises: a nanofiltration concentrated water tank, a primary nanofiltration system and a secondary nanofiltration system;

[0013] The primary nanofiltration system comprises: a primary water inlet pump, a primary water inlet valve, a primary filter, a primary high-pressure pump, a primary first-stage circulation pump, a primary first-stage membrane assembly, a primary first-stage produced water discharge valve, a primary produced water tank, a primary first-stage concentrated water regulating valve, a primary second-stage water inlet valve, a primary second-stage circulation pump, and a primary second-stage membrane assembly; the liquid outlet pipe of the nanofiltration concentrated water tank is connected to the liquid inlet pipe of the primary water inlet pump, the liquid outlet pipe of the primary water inlet pump is connected to the first end of the primary water inlet valve, and the second end of the primary water inlet valve is connected to the liquid inlet pipe of the primary filter; the liquid outlet pipe of the primary filter is connected to the liquid inlet pipe of the primary high-pressure pump, the liquid outlet pipe of the primary high-pressure pump is connected to the liquid inlet pipe of the primary first-stage circulation pump, and the liquid outlet pipe of the primary first-stage circulation pump is connected to the liquid inlet pipe of the primary first-stage membrane assembly; The water production pipe of the first-stage membrane assembly is connected to the liquid inlet pipe of the first-stage water production tank through the first-stage water production discharge valve; the concentrate water pipe of the first-stage membrane assembly is also connected to the liquid inlet pipe of the first-stage circulation pump, the concentrate water pipe of the first-stage membrane assembly is connected to the first end of the first-stage concentrate water regulating valve, and the second end of the first-stage concentrate water regulating valve is connected to the first end pipeline of the first-stage second-stage water inlet valve; the second end of the first-stage second-stage water inlet valve is connected to the liquid inlet pipe of the first-stage second-stage circulation pump, the liquid outlet pipe of the first-stage second-stage circulation pump is connected to the liquid inlet pipe of the first-stage second-stage membrane assembly, the water production pipe of the first-stage second-stage membrane assembly is also connected to the circulation liquid inlet pipe of the nanofiltration concentrate water tank through the first-stage second-stage water production discharge valve, and the concentrate water pipe of the first-stage second-stage membrane assembly is also connected to the first end of the first-stage second-stage concentrate water regulating valve;

[0014] The secondary nanofiltration system includes: a secondary water inlet pump, a secondary water inlet valve, a secondary filter, a secondary high-pressure pump, a secondary circulation pump, a secondary membrane assembly, and a secondary concentrated water regulating valve; the liquid inlet pipe of the secondary water inlet pump is connected to the liquid outlet pipe of the primary water production tank, the liquid outlet pipe of the secondary water inlet pump is connected to the first end of the secondary water inlet valve, the second end of the secondary water inlet valve is connected to the liquid inlet pipe of the secondary filter, the liquid outlet pipe of the secondary filter is connected to the liquid inlet pipe of the secondary high-pressure pump, the liquid outlet pipe of the secondary high-pressure pump is connected to the liquid inlet pipe of the secondary circulation pump, the liquid outlet pipe of the secondary circulation pump is connected to the liquid inlet pipe of the secondary membrane, and the concentrated water pipe of the secondary membrane is respectively connected to the liquid inlet pipe of the secondary circulation pump and the first end of the secondary concentrated water regulating valve; the water production pipe of the secondary membrane is connected to the first end of the secondary water production discharge valve.

[0015] Preferably, the cleaning component includes: an acidic chemical cleaning agent storage tank, an alkaline chemical cleaning agent storage tank, an acidic dosing pump, an alkaline dosing pump, a cleaning pump, a water replenishment valve, a cleaning drain valve, a circulating liquid inlet pipe, multiple cleaning water inlet valves, multiple water production cleaning valves and multiple concentrated water cleaning valves; the multiple cleaning water inlet valves, multiple water production cleaning valves and multiple concentrated water cleaning valves all correspond to multiple nanofiltration systems one by one, the acidic chemical cleaning agent storage tank is connected to the cleaning tank through the acidic dosing pump; the alkaline chemical cleaning agent storage tank is connected to the cleaning tank through the alkaline dosing pump; the cleaning tank is connected to an external tap water pipeline through a water replenishment valve, the liquid outlet pipe of the cleaning tank is connected to the liquid inlet pipe of the cleaning pump, the cleaning pump is respectively connected to the first ends of the multiple cleaning water inlet valves, and the second end of each cleaning water inlet valve is connected to the high-pressure pump inlet pipe or the flow pipe of the corresponding nanofiltration system. The filter is connected to the liquid inlet pipe of the filter; the first end of each water production cleaning valve is connected to the circulating liquid inlet pipe of the cleaning box, and the second end is connected to the water production pipe of the membrane component of the corresponding nanofiltration system; one end of each concentrated water cleaning valve is connected to the circulating liquid inlet pipe of the cleaning box, and the other end is connected to the concentrated water pipe of the membrane component of the nanofiltration system; the control ends of the acid dosing pump, alkaline dosing pump, cleaning pump, water replenishment valve, cleaning emptying valve, multiple cleaning water inlet valves, multiple water production cleaning valves and multiple concentrated water cleaning valves are all connected to the control end of the control component; the cleaning box is also provided with a cleaning liquid level meter, a cleaning mixer and a cleaning pH meter, and the control ends of the cleaning liquid level meter, the cleaning mixer and the cleaning pH meter are all connected to the control end of the control component, and the cleaning liquid level meter is used to measure the liquid level height of the cleaning box and send the measured liquid level height to the control component;

[0016] The control assembly includes a cleaning liquid preparation control module, the control end of which is respectively connected to the control ends of the cleaning liquid level meter, the cleaning mixer, the cleaning pH meter, the water replenishment valve, the acid dosing pump, and the alkaline dosing pump. The cleaning liquid preparation control module has a plurality of cleaning liquid preparation modes, including: a clean water preparation mode, an acid cleaning liquid preparation mode, and an alkaline cleaning liquid preparation mode;

[0017] When the cleaning liquid preparation module is in the clean water preparation mode, the cleaning liquid preparation module is used to:

[0018] Open the water supply valve and detect the liquid level in the cleaning tank by using the cleaning tank liquid level gauge. When the liquid level in the cleaning tank reaches a set value, close the water supply valve;

[0019] When the cleaning solution preparation module is in the acidic cleaning solution preparation mode, the cleaning solution preparation module is used to:

[0020] Open the water supply valve and detect the liquid level in the cleaning tank by using the cleaning tank liquid level gauge. When the liquid level in the cleaning tank reaches a set value, close the water supply valve;

[0021] Turn on the cleaning mixer and the acid cleaning agent dosing pump in sequence, and detect the pH value of the cleaning tank by using the cleaning tank pH meter. When the pH value in the cleaning tank is ≤ the lower limit of the acid cleaning pH value interval, turn off the acid cleaning agent dosing pump. When the pH value in the cleaning tank is ≥ the upper limit of the acid cleaning pH value interval, turn on the acid cleaning agent dosing pump, and the acid cleaning agent dosing pump is interlocked with the cleaning pH meter for control;

[0022] When the cleaning solution preparation module is in the alkaline cleaning solution preparation mode, the cleaning solution preparation module is used to:

[0023] Open the water supply valve and detect the liquid level in the cleaning tank by using the cleaning tank liquid level gauge. When the liquid level in the cleaning tank reaches a set value, close the water supply valve;

[0024] Turn on the cleaning mixer and alkaline cleaning agent dosing pump in sequence, and detect the pH value of the cleaning tank by the cleaning tank pH meter. When the pH value in the cleaning tank is ≥ the lower limit of the alkaline cleaning pH value range, turn off the acid cleaning agent dosing pump. When the pH value in the cleaning tank is ≤ the upper limit of the alkaline cleaning pH value range, turn on the alkaline cleaning agent dosing pump. The alkaline cleaning agent dosing pump is interlocked with the cleaning pH meter for control.

[0025] Preferably, the cleaning water inlet valve includes: a first-stage cleaning water inlet valve, a first-stage second-stage cleaning water inlet valve, and a second-stage cleaning water inlet valve; the produced water cleaning valve includes: a first-stage produced water cleaning valve, a first-stage second-stage produced water cleaning valve, and a second-stage produced water cleaning valve; the concentrated water cleaning valve includes a first-stage concentrated water cleaning valve, a first-stage second-stage concentrated water cleaning valve, and a second-stage concentrated water cleaning valve;

[0026] The cleaning pump is connected to the liquid inlet pipe of the first-stage filter through the first-stage cleaning water inlet valve; the water production pipe of the first-stage membrane assembly is also connected to the circulating liquid inlet pipe of the cleaning tank through the first-stage water production cleaning valve; the second end of the first-stage concentrated water regulating valve is also connected to the circulating liquid inlet pipe of the cleaning tank through the first-stage concentrated water cleaning valve;

[0027] The cleaning pump is connected to the first-stage second-stage water inlet valve through the first-stage second-stage cleaning water inlet valve, and the water production pipe of the first-stage second-stage membrane assembly is also connected to the circulating liquid inlet pipe of the cleaning tank through the first-stage second-stage water production cleaning valve; the second end of the first-stage second-stage concentrated water regulating valve is also connected to the circulating liquid inlet pipe of the cleaning tank through the first-stage second-stage concentrated water cleaning valve;

[0028] The cleaning pump is connected to the liquid inlet pipe of the secondary filter through a secondary cleaning water inlet valve; the water production pipe of the secondary membrane assembly is also connected to the circulating liquid inlet pipe of the cleaning tank through a secondary water production cleaning valve; the second end of the secondary concentrated water regulating valve is also connected to the circulating liquid inlet pipe of the cleaning tank through a secondary concentrated water cleaning valve.

[0029] Preferably, the control component includes a cleaning process control module, which is used to control the cleaning component to conduct the cleaning channel of the system or equipment to be cleaned after the cleaning component prepares the cleaning liquid, so that the prepared cleaning liquid enters the cleaning system or equipment for cleaning, and controls the cleaning process of the system or equipment to be cleaned. The cleaning process control module has multiple system cleaning modes, including: a primary system cleaning mode, a primary first-order system cleaning mode, a primary second-order system cleaning mode, and a secondary system cleaning mode;

[0030] When the cleaning process control module is in the primary system cleaning mode, it is used to:

[0031] Open the first stage cleaning water inlet valve, the first stage water production cleaning valve, the first stage concentrated water regulating valve 100% in sequence, the first stage second stage water inlet valve, the first stage second stage water production cleaning valve, the first stage second stage concentrated water regulating valve 100% open, and the first stage second stage concentrated water discharge valve;

[0032] After confirming that all valves are fully opened, delay starting the cleaning pump, delay starting the first-stage high-pressure pump, delay starting the first-stage first-stage circulation pump, and delay starting the first-stage second-stage circulation pump;

[0033] Delay opening of the first-stage and second-stage concentrated water cleaning valves, and after confirming that the valves are fully opened, delay closing of the first-stage and second-stage concentrated water discharge valves;

[0034] The system automatically enters the first-stage system flushing mode. When the first-stage system flushing time reaches the set time or the pH value displayed by the cleaning pH meter in the cleaning box, the first-stage system flushing mode shutdown program is triggered, and the first-stage two-stage circulation pump, the first-stage one-stage circulation pump, the first-stage high-pressure pump, and the cleaning pump are delayed in sequence. After confirming that all pumps are shut down, the first-stage one-stage cleaning water inlet valve, the first-stage one-stage water production cleaning valve, the first-stage one-stage concentrated water regulating valve, the first-stage two-stage water inlet valve, the first-stage two-stage water production cleaning valve, the first-stage two-stage concentrated water regulating valve, and the first-stage two-stage concentrated water cleaning valve are delayed to close. The first-stage one-stage water production discharge valve, the first-stage two-stage water production discharge valve, the first-stage two-stage concentrated liquid discharge valve, and the cleaning drain valve are opened;

[0035] When the cleaning process control module is in the first-stage first-order system cleaning mode, it is used to:

[0036] Open the first stage cleaning water inlet valve, first stage water production cleaning valve, first stage concentrated water regulating valve 100% and first stage concentrated water cleaning valve in sequence;

[0037] After confirming that all valves are fully opened, delay the start of the cleaning pump, delay the start of the first-stage high-pressure pump, and delay the start of the first-stage circulation pump;

[0038] The system automatically enters the flushing mode of the first stage system. When the flushing time of the first stage system reaches the set time or the set pH value, the shutdown program of the first stage system flushing mode is triggered, and the first stage circulation pump, the first stage high pressure pump, and the cleaning pump are delayed to be closed in sequence. After confirming that all pumps are shut down, the first stage cleaning water inlet valve, the first stage water production cleaning valve, the first stage concentrated water regulating valve, and the first stage concentrated water cleaning valve are delayed to be closed, and the first stage water production discharge valve and the cleaning drain valve are opened;

[0039] When the cleaning process control module is in the first-stage second-stage system cleaning mode, it is used to:

[0040] Open the first-stage second-stage cleaning water inlet valve, the first-stage second-stage water production cleaning valve, the first-stage second-stage concentrated water regulating valve 100%, and the first-stage second-stage concentrated water discharge valve in sequence;

[0041] After confirming that all valves are fully opened, delay the start of the cleaning pump and the delay the start of the first-stage and second-stage circulation pumps;

[0042] Delay opening of the first-stage and second-stage concentrated water cleaning valves, and after confirming that the valves are fully opened, delay closing of the first-stage and second-stage concentrated water discharge valves;

[0043] The system automatically enters the first-stage two-stage system flushing mode. When the first-stage two-stage system flushing time reaches the set time or the set pH value, the first-stage two-stage system flushing mode shutdown program is triggered, and the first-stage two-stage circulation pump and the cleaning pump are automatically closed in sequence. After confirming that all pumps are closed, the first-stage two-stage cleaning water inlet valve, the first-stage two-stage water production cleaning valve, the first-stage two-stage concentrated water regulating valve, and the first-stage two-stage concentrated water cleaning valve are closed with delay, and the first-stage two-stage water production discharge valve and the cleaning drain valve are opened;

[0044] When the cleaning process control module is in the secondary system cleaning mode, it is used to:

[0045] Open the secondary cleaning water inlet valve, secondary water production cleaning valve, secondary concentrated water regulating valve 100% in sequence, and the secondary concentrated water discharge valve;

[0046] After confirming that all valves are fully opened, delay starting the cleaning pump, delay starting the secondary high-pressure pump, and delay starting the secondary circulation pump;

[0047] Delay opening of the secondary concentrated water cleaning valve, and after confirming that the valve is fully opened, delay closing of the secondary concentrated water discharge valve;

[0048] The system automatically enters the secondary system flushing mode. When the secondary system flushing time reaches the set time or the set pH value, the secondary system flushing mode shutdown program is triggered, and the secondary circulation pump, secondary high-pressure pump, and cleaning pump are automatically and sequentially delayed shut down. After confirming that all pumps are shut down, the secondary cleaning water inlet valve, secondary water production cleaning valve, secondary concentrated water regulating valve, and secondary concentrated water cleaning valve are delayed shut down, and the secondary water production discharge valve and cleaning drain valve are opened.

[0049] Preferably, when it is determined that the concentration and reduction component needs to be cleaned, the control component also sends system cleaning mode and cleaning liquid preparation mode options to the user; and receives the selected system cleaning mode and cleaning liquid preparation mode sent by the user, and adjusts the cleaning liquid preparation mode of the cleaning liquid preparation control module to the selected cleaning liquid preparation mode to prepare the selected cleaning liquid; and adjusts the system cleaning mode of the cleaning object control module to the selected system cleaning mode to use the prepared, selected cleaning liquid to clean the selected system.

[0050] Preferably, the collection component includes: a membrane inlet pressure sensor arranged on the liquid inlet pipe of each membrane module of the concentration and reduction module, a membrane outlet pressure sensor arranged on the concentrated water pipe of each membrane module of the concentration and reduction module; a water production flow meter arranged on the water production pipe of each membrane module of the concentration and reduction module, and a water production conductivity meter arranged on the water production pipe of the secondary membrane module;

[0051] The real-time operation data includes: the membrane inlet pressure value collected by the membrane inlet pressure sensor and the membrane outlet pressure collected by the membrane outlet pressure sensor, the membrane assembly water production flow rate collected by the water production flowmeter, the membrane assembly water production conductivity collected by the water production conductivity meter, and the automatic operation time of the concentration and reduction assembly;

[0052] The cleaning includes chemical cleaning and water flushing; the control component is used for:

[0053] The front-to-back pressure difference of each membrane component is calculated according to the membrane inlet pressure and the membrane outlet pressure of each membrane component, and the front-to-back pressure difference of each membrane component is compared with its preset pressure threshold. When the front-to-back pressure difference of any membrane component exceeds the pressure threshold, it is determined that the concentration and reduction component needs chemical cleaning;

[0054] Compare the water production flow rate value of each membrane component with its preset flow rate threshold value, and when the water production flow rate value of any membrane component is lower than the preset flow rate for a duration exceeding the preset time threshold value, it is determined that the concentration and reduction component needs chemical cleaning;

[0055] Comparing the water conductance value of the secondary membrane assembly with a preset conductance threshold, and when the duration of the water conductance value being higher than the preset conductance threshold exceeds a calibrated conductance time threshold, determining that the concentration and reduction assembly needs chemical cleaning;

[0056] Monitoring the automatic operation time of the concentration and reduction component, and comparing the automatic operation time of the nanofiltration concentrate reduction system with a preset chemical cleaning time threshold, when the continuous operation time of the nanofiltration concentrate reduction system in the automatic operation state exceeds the preset chemical cleaning time threshold, determining that the concentration and reduction component needs chemical cleaning;

[0057] The automatic operation time of the concentration and reduction component is compared with the preset flushing time threshold. When the automatic operation time of the concentration and reduction component exceeds the preset flushing time threshold and the concentration and reduction component is shut down, the clean water flushing mode is triggered.

[0058] Preferably, the system cleaning mode has the following chemical cleaning modes:

[0059] A primary system acid chemical cleaning mode, wherein the primary system acid chemical cleaning mode is specifically: the cleaning liquid preparation control module executes the acid cleaning liquid preparation mode, and the cleaning object control module executes the primary system cleaning mode;

[0060] A primary system alkaline chemical cleaning mode, wherein the primary system alkaline chemical cleaning mode is specifically: the cleaning liquid preparation control module executes the alkaline cleaning liquid preparation mode, and the cleaning object control module executes the primary system cleaning mode;

[0061] A first-stage, first-order system acidic chemical cleaning mode, wherein the first-stage, first-order system acidic chemical cleaning mode is specifically: the cleaning liquid preparation control module executes the acidic cleaning liquid preparation mode, and the cleaning object control module executes the first-stage, first-order system cleaning mode;

[0062] A first-stage, first-order system alkaline chemical cleaning mode, wherein the first-stage, first-order system alkaline chemical cleaning mode is specifically: the cleaning liquid preparation control module executes the alkaline cleaning liquid preparation mode, and the cleaning object control module executes the first-stage, first-order system cleaning mode;

[0063] A first-stage two-stage system acidic chemical cleaning mode, wherein the first-stage two-stage system acidic chemical cleaning mode is specifically: the cleaning liquid preparation control module executes the acidic cleaning liquid preparation mode, and the cleaning object control module executes the first-stage two-stage system cleaning mode;

[0064] A first-stage two-stage system alkaline chemical cleaning mode, wherein the first-stage two-stage system alkaline chemical cleaning mode is specifically: the cleaning liquid preparation control module executes the alkaline cleaning liquid preparation mode, and the cleaning object control module executes the first-stage two-stage system cleaning mode;

[0065] A secondary system acid chemical cleaning mode, wherein the secondary system acid chemical cleaning mode is specifically: the cleaning liquid preparation control module executes the acid cleaning liquid preparation mode, and the cleaning object control module executes the secondary system cleaning mode;

[0066] A primary system alkaline chemical cleaning mode, wherein the primary system alkaline chemical cleaning mode is specifically: the cleaning liquid preparation control module executes the alkaline cleaning liquid preparation mode, and the cleaning object control module executes the primary system cleaning mode;

[0067] The system cleaning mode has the following clean water flushing modes:

[0068] A primary system clean water flushing mode, wherein the primary system clean water flushing mode is specifically: the cleaning liquid preparation control module executes the clean water preparation mode, and the cleaning object control module executes the primary system cleaning mode;

[0069] A first-stage, first-order system clean water flushing mode, wherein the first-stage, first-order system clean water flushing mode is specifically: the cleaning liquid preparation control module executes the clean water preparation mode, and the cleaning object control module executes the first-stage, first-order system cleaning mode;

[0070] A primary and secondary system clean water flushing mode, wherein the primary and secondary system clean water flushing mode is specifically: the cleaning liquid preparation control module executes the clean water preparation mode, and the cleaning object control module executes the primary system cleaning mode;

[0071] The secondary system clean water flushing mode is specifically: the cleaning liquid preparation control module executes the clean water preparation mode, and the cleaning object control module executes the secondary system cleaning mode.

[0072] When it is determined that the concentration and reduction component requires chemical cleaning, the control component is used to send its own chemical cleaning mode to the user as an option, accept and execute the chemical cleaning mode selected by the user; after chemical cleaning of any system, the control component is also used to execute the clean water cleaning mode of the corresponding system.

[0073] Preferably, it also includes: a scale inhibition component and an acid injection component, wherein the scale inhibition component includes a scale inhibition agent storage tank, a primary scale inhibition injection pump, and a secondary scale inhibition injection pump; the liquid outlet pipe of the scale inhibition agent storage tank is respectively connected to the liquid inlet pipe of the primary scale inhibition injection pump and the liquid inlet pipe of the secondary scale inhibition injection pump, the liquid outlet pipe of the primary scale inhibition injection pump is connected to the liquid inlet pipe of the primary high-pressure pump; the liquid outlet pipe of the secondary scale inhibition injection pump is connected to the liquid inlet pipe of the secondary filter, and the control ends of the primary scale inhibition injection pump and the secondary scale inhibition injection pump are connected to the liquid inlet pipe of the secondary filter. The control end of the control component is connected; the acid dosing component includes: an acid storage tank, a primary acid dosing pump, and a secondary acid dosing pump; the liquid outlet pipe of the acid storage tank is respectively connected to the liquid inlet pipe of the primary acid dosing pump and the liquid inlet pipe of the secondary acid dosing pump, the liquid outlet pipe of the primary acid dosing pump is connected to the liquid inlet pipe of the nanofiltration concentrated water tank; the liquid outlet pipe of the secondary acid dosing pump is connected to the liquid inlet pipe of the primary water production tank; the control ends of the primary acid dosing pump and the secondary acid dosing pump are both connected to the control end of the control component;

[0074] A nanofiltration concentrated water tank level gauge is installed in the nanofiltration concentrated water tank, and a control end of the nanofiltration concentrated water tank level gauge is connected to a control end of the control component; the control component is used to execute the following automatic system cleaning mode according to the user's automatic operation instruction:

[0075] The control component monitors the real-time liquid level of the nanofiltration concentrated water tank through the nanofiltration concentrated water tank level gauge, and compares the real-time liquid level of the nanofiltration concentrated water tank with the set liquid level for starting the nanofiltration concentrated liquid reduction system. When the liquid level of the nanofiltration concentrated water tank reaches the set liquid level for starting the nanofiltration concentrated liquid reduction system, the nanofiltration concentrated water tank agitator, the first-stage water inlet valve, the first-stage first-stage water production discharge valve, the first-stage first-stage concentrated water regulating valve opened 100%, the first-stage second-stage water inlet valve, the first-stage second-stage water production discharge valve, the first-stage second-stage concentrated water regulating valve opened 100%, and the first-stage second-stage concentrated water discharge valve are opened in sequence;

[0076] After confirming that all valves are fully opened, delay starting the first-stage water inlet pump, the first-stage anti-scaling pump, the first-stage high-pressure pump, the first-stage first-stage circulation pump, and delay adjusting the opening degree of the first-stage first-stage concentrated water regulating valve to the set pressure range;

[0077] After confirming that the opening degree of the first-stage concentrated water regulating valve is adjusted to the right position, the first-stage second-stage circulation pump is started with a delay, and the opening degree of the first-stage second-stage concentrated water regulating valve is adjusted to the set pressure or flow range with a delay;

[0078] When the liquid level in the primary water production tank reaches the set start level, the primary water production tank mixer, secondary water inlet valve, secondary water production discharge valve, secondary concentrated water regulating valve open 100%, and secondary concentrated water discharge valve are automatically opened in sequence;

[0079] After confirming that the above valves are fully opened, delay the start of the secondary water inlet pump, the secondary antiscalant dosing pump, the secondary high-pressure pump, the secondary circulation pump, and adjust the opening of the secondary concentrated water regulating valve to the set pressure or flow range;

[0080] The system enters automatic operation state.

[0081] Preferably, a first water inlet pressure sensor is installed on the liquid inlet pipe of the filter, and a second water inlet pressure sensor is installed on the liquid outlet pipe of the filter, and both the first water inlet pressure sensor and the second water inlet pressure sensor are connected to the control component;

[0082] The first water inlet pressure sensor is used to collect the liquid pressure value at the filter inlet pipe, and send the liquid pressure value at the filter inlet pipe to the control component; the second water inlet pressure sensor is used to collect the liquid pressure value at the filter outlet pipe, and send the liquid pressure value at the filter outlet pipe to the control component; the control component is used to calculate the filtration pressure difference between the liquid pressure value at the filter inlet pipe and the liquid pressure value at the filter outlet pipe, and determine whether the filtration pressure difference is greater than the upper limit of a preset filtration pressure difference range:

[0083] When the filtration pressure difference is greater than the upper limit of the preset filtration pressure difference interval, an alarm signal is sent to the user, and the user is prompted to replace the filter element of the filter;

[0084] When the filtration pressure difference is lower than the lower limit of the filtration pressure difference interval for a duration ≥ a preset time, the nanofiltration system is controlled to enter a shutdown state;

[0085] A third water inlet pressure sensor is installed on the liquid outlet side pipeline of the high-pressure pump, and the control end of the third water inlet pressure sensor is connected to the control end of the control component. The third water inlet pressure sensor is used to collect the liquid pressure value output by the high-pressure pump, and compare the liquid pressure value output by the high-pressure pump with a preset pressure threshold. When the liquid pressure is higher than the preset pressure threshold, the nanofiltration system is controlled to enter a shutdown state.

[0086] The present invention has the following beneficial effects:

[0087] (1) The nanofiltration concentrate reduction system realizes automated operation to the maximum extent, reduces manual operation, facilitates maintenance, and greatly reduces management difficulty and manpower investment;

[0088] (2) Through the intelligent control system, the two-stage material separation membrane system can maintain a high water production flux for a long time, which reduces energy consumption and operating costs to a certain extent;

[0089] (3) The online cleaning of the nanofiltration concentrate reduction system is realized, avoiding the need to lift out the two-stage material separation membrane components for offline cleaning, reducing the occurrence of wire breakage, increasing the stability of the two-stage material separation membrane system operation, and reducing the floor space occupied;

[0090] (4) The real-time monitoring of the produced water quality by the intelligent control system effectively ensures the produced water quality of the two-stage material separation membrane system, providing a strong guarantee for the effluent to meet the discharge standards.

[0091] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0092] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0093] Figure 1 It is a control diagram of an automatic cleaning landfill leachate nanofiltration concentrate reduction system disclosed in the present invention;

[0094] Figure 2 It is a structural diagram of an automatic cleaning landfill leachate nanofiltration concentrate reduction system disclosed in the present invention;

[0095] Note in the figure:

[0096] 1-nanofiltration concentrated water tank level gauge; 2-nanofiltration concentrated water tank agitator; 3-nanofiltration concentrated water tank; 4-nanofiltration concentrated water tank pH meter; 5-first-stage water inlet pump; 6-first-stage water inlet valve; 7-first-stage first water inlet pressure sensor; 8-first-stage water inlet thermometer; 9-first-stage second-stage water production discharge valve; 10-first-stage water inlet conductivity meter; 11-first-stage second water inlet pressure sensor; 12-first-stage water inlet flowmeter; 13-first-stage high-pressure pump; 14-first-stage third water inlet pressure sensor; 15-first-stage first-stage membrane inlet pressure sensor; 16-first-stage first-stage circulation pump; 17-first-stage first-stage material membrane shell and membrane assembly; 18-first-stage first-stage water production sampling valve; 19-first-stage first-stage membrane outlet pressure sensor; 20-first-stage second-stage water production flowmeter; 21-first-stage first-stage concentrated Water regulating valve; 22-first stage one section water flow meter; 23-first stage two section water inlet valve; 24-first stage two section water sampling valve; 25-first stage two section membrane inlet pressure sensor; 26-first stage two section circulation pump; 27-first stage two section material membrane shell and membrane assembly; 28-first stage two section membrane outlet pressure sensor; 29-first stage filter; 30-first stage two section concentrated water flow meter; 31-first stage two section concentrated water regulating valve; 32-second stage water sampling valve; 33-second stage material membrane shell and membrane assembly; 34-second stage concentrated water flow meter; 35-second stage membrane outlet pressure sensor; 36-second stage circulation pump; 37-second stage concentrated water regulating valve; 38-scale inhibitor storage tank level gauge; 39-second stage scale inhibitor dosing pump; 40-first stage scale inhibitor dosing pump; 41-scale inhibitor storage tank tank; 42-secondary membrane inlet pressure sensor; 43-secondary water production flowmeter; 44-secondary third water inlet pressure sensor; 45-secondary water production conductivity meter; 46-secondary high-pressure pump; 47-secondary second water inlet pressure sensor; 48-secondary filter; 49-secondary water production cleaning valve; 50-secondary concentrated water cleaning valve; 51-first stage water production cleaning valve; 52-first stage second concentrated water cleaning valve; 53-first stage second stage water production cleaning valve; 54-secondary cleaning water inlet valve; 55-first stage second stage cleaning water inlet valve; 56-first stage first stage cleaning water inlet valve; 57-cleaning pump; 58-cleaning pH meter; 59-cleaning liquid level meter; 60-cleaning drain valve; 61-alkaline cleaning agent dosing pump; 62-acidic cleaning agent dosing pump; 63-alkaline Cleaning agent storage tank; 64-alkaline cleaning agent storage tank level gauge; 65-primary acid dosing pump; 66-secondary acid dosing pump; 67-acid storage tank; 68-acid storage tank level gauge; 69-acid cleaning agent storage tank; 70-acid cleaning agent storage tank level gauge; 71-cleaning tank; 72-cleaning mixer; 73-secondary water inlet pump; 74-secondary water inlet valve; 75-primary water production tank pH meter; 76-secondary first water inlet pressure sensor; 77-secondary water inlet flow meter; 78-primary water production tank; 79-primary water production tank mixer; 80-primary water production tank level gauge; 81-secondary water production discharge valve; 82-secondary concentrated water discharge valve; 83-first stage water production discharge valve; 84-first stage second stage concentrated water discharge valve; 85-first stage first stage concentrated water cleaning valve. DETAILED DESCRIPTION

[0097] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0098] Embodiment 1:

[0099] like Figure 1 and Figure 2 As shown, the present embodiment discloses an automatic cleaning landfill leachate nanofiltration concentrate reduction system, including a primary material membrane housing and a membrane assembly, a secondary material membrane housing and a membrane assembly 33, a nanofiltration concentrated water tank 3, a primary water inlet pump 5, a primary filter 29, a primary high-pressure pump 13, a primary circulation pump, a primary water production tank 78, a secondary water inlet pump 73, a secondary filter 48, a secondary high-pressure pump 46, a secondary circulation pump 36, a cleaning tank 71, a cleaning pump 57, an acid cleaning agent storage tank 69, an alkaline cleaning agent storage tank 63, a scale inhibitor storage tank 41, an acid storage tank 67 and an intelligent control system;

[0100] Wherein, the intelligent control system comprises a computer and a process controller, and the computer and the input end are electrically connected to the process controller;

[0101] Among them, the nanofiltration concentrated water tank 3 is connected to the primary water inlet pump 5 through a pipeline, and a primary water inlet valve 6 is provided on the water inlet pipeline. The primary water inlet valve 6 is connected to the primary filter 29, the primary high-pressure pump 13, the primary circulation pump, the primary material membrane shell and the membrane assembly through the primary water inlet pipeline; the nanofiltration concentrated water tank 3 is provided with a nanofiltration concentrated water tank level gauge 1 for detecting the liquid level and a nanofiltration concentrated water tank pH meter 4 for detecting the pH value of the nanofiltration concentrated water tank 3, and the nanofiltration water tank is also provided with a nanofiltration concentrated water tank stirrer 2 for mixing and homogenizing water quality; the nanofiltration concentrated water tank level gauge 1, the nanofiltration concentrated water tank pH meter 4, the nanofiltration concentrated water tank stirrer 2, the primary water inlet pump 5, the primary water inlet valve 6, the primary high-pressure pump 13, and the primary circulation pump are all electrically connected to the intelligent control system;

[0102] Wherein, the acid storage tank 67 and the primary acid dosing pump 65 are connected to the nanofiltration concentrated water tank 3 through a pipeline; the acid storage tank 67 is provided with an acid storage tank level gauge 68 for detecting the liquid level. When the liquid level of the acid storage tank 67 is lower than the set value, the intelligent control system sends an alarm signal to prompt manual dosing; the primary acid dosing pump 65 is interlocked with the nanofiltration concentrated water tank pH meter 4 and the nanofiltration concentrated water tank mixer 2, and the start and stop of the primary acid dosing pump 65 is controlled by the nanofiltration concentrated water tank pH meter 4, and the pH value of the nanofiltration concentrated water tank 3 is controlled within the range of 6.0-6.8; the acid storage tank level gauge 68 uses an ultrasonic level gauge with strong corrosion resistance and high precision; the acid storage tank level gauge 68 and the primary acid dosing pump 65 are electrically connected to the intelligent control system;

[0103] Among them, the first-level water inlet pipeline is provided with a first-level water inlet thermometer 8 and a first-level water inlet conductivity meter 10 for detecting water quality, a first-level water inlet flowmeter 12 for detecting flow rate, and the first-level filter 29 is provided with a first-level first water inlet pressure sensor 7 and a first-level second water inlet pressure sensor 11 for detecting filter performance, and a first-level third water inlet pressure sensor 14 for detecting the pressure after the first-level high-pressure pump 13; the first-level water inlet thermometer 8, the first-level water inlet conductivity meter 10, the first-level water inlet flowmeter 12, the first-level first water inlet pressure sensor 7, the first-level second water inlet pressure sensor 11, and the first-level third water inlet pressure sensor 14 are electrically connected to the intelligent control system; the first-level filter 29 has a filtration accuracy of ≤5um, and a core-type security filter is selected. When the pressure difference before and after the filtration is ≥1.0bar, the intelligent control system can automatically pop up an alarm to prompt the replacement of the filter element;

[0104] The first-level water inlet pipeline is also provided with an antiscalant dosing device, which includes a first-level antiscalant dosing pump 40, a second-level antiscalant dosing pump 39, an antiscalant storage tank 41 and an antiscalant storage tank level gauge 38; the antiscalant storage tank 41 and the first-level antiscalant dosing pump 40 are connected to the first-level water inlet pipeline through a pipeline, and the first-level antiscalant dosing pump 40 and the antiscalant storage tank level gauge 38 are electrically connected to the intelligent control system; when the liquid level of the antiscalant storage tank 41 is lower than the set value, the intelligent control system sends an alarm signal to prompt manual dosing; the antiscalant storage tank level gauge 38 uses an ultrasonic level gauge with strong corrosion resistance and high precision, and the antiscalant is a special antiscalant;

[0105] Among them, the first-level circulation pump is divided into a first-stage circulation pump 16 and a first-stage circulation pump 26; the first-level material membrane shell and membrane assembly are divided into a first-stage material membrane shell and membrane assembly 17 and a first-stage material membrane shell and membrane assembly 27; the first-stage circulation pump 16 is connected with the first-stage material membrane shell and membrane assembly 17 through an inlet pipeline, and the inlet pipeline connecting the first-stage circulation pump 16 with the first-stage material membrane shell and membrane assembly 17 is also provided with a first-stage membrane inlet pressure sensor 15 for detecting the membrane inlet pressure; the first-stage concentrated liquid pipeline of the first-stage material membrane shell and membrane assembly 17 is provided with a first-stage membrane outlet pressure sensor 19 for detecting the membrane outlet pressure, and the first-stage concentrated liquid pipeline is connected with the first-level water inlet pipeline to improve the system recovery rate; the first-stage concentrated liquid pipeline is connected with the first-stage concentrated water regulating valve 21, the first-stage water inlet valve 23, the first-stage circulation pump 26, the first-stage membrane inlet pressure sensor 25, the first-stage material membrane shell and membrane assembly 27; The first-stage and second-stage material membrane shell and membrane assembly 27 concentrate water measuring line of the first-stage and second-stage concentrated liquid is provided with a first-stage and second-stage membrane pressure sensor 28 for detecting the membrane pressure, a first-stage and second-stage concentrated water regulating valve 31, a first-stage and second-stage concentrated water flowmeter 30, a first-stage and second-stage concentrated water cleaning valve 52, and a first-stage and second-stage concentrated water discharge valve 84; the first-stage and second-stage concentrated water discharge valve 84 discharges humic acid through the first-stage and second-stage concentrated liquid pipeline to spray back into the furnace or recycle it as a resource, and the first-stage and second-stage concentrated water cleaning valve 52 is connected to the cleaning tank 71 through a pipeline ... The first stage circulation pump 16, the first stage second stage circulation pump 26, the first stage first stage membrane inlet pressure sensor 15, the first stage first stage membrane outlet pressure sensor 19, the first stage first stage concentrated water regulating valve 21, the first stage second stage water inlet valve 23, the first stage second stage circulation pump 26, the first stage second stage membrane inlet pressure sensor 25, the first stage second stage membrane outlet pressure sensor 28 and the first stage second stage concentrated water regulating valve 31, the first stage second stage concentrated water flowmeter 30, the first stage second stage concentrated water cleaning valve 52, and the first stage second stage concentrated water discharge valve 84 are all electrically connected to the intelligent control system;

[0106] The first-stage material membrane shell and the membrane assembly 17 are connected to the water production side through the first-stage water production pipeline, and the first-stage water production pipeline is provided with a first-stage water production sampling valve 18 for manual detection and sampling, a first-stage water production flowmeter 22, a first-stage water production discharge valve 83, and a first-stage water production cleaning valve 51; the first-stage water production discharge valve 83 is connected to the first-stage water production tank 78 through the first-stage water production pipeline, and the first-stage water production cleaning valve 51 is connected to the cleaning tank 71 through a pipeline, and the first-stage water production flowmeter 22, the first-stage water production discharge valve 83, and the first-stage water production cleaning valve 51 are electrically connected to the intelligent control system;

[0107] Among them, the water production side of the first-stage and second-stage material membrane membrane shell and the membrane assembly 27 are connected through the first-stage and second-stage water production pipeline, and the first-stage and second-stage water production pipeline is provided with a first-stage and second-stage water production sampling valve 24 for manual detection and sampling, a first-stage and second-stage water production flowmeter 20, a first-stage and second-stage water production discharge valve 9, and a first-stage and second-stage water production cleaning valve 53; the first-stage and second-stage water production discharge valve 9 is connected to the nanofiltration concentrated water tank 3 through the first-stage and second-stage water production pipeline, and the first-stage and second-stage water production cleaning valve 53 is connected to the cleaning tank 71 through a pipeline, and the first-stage and second-stage water production flowmeter 20, the first-stage and second-stage water production discharge valve 9, and the first-stage and second-stage water production cleaning valve 53 are electrically connected to the intelligent control system;

[0108] The primary water tank 78 is provided with a primary water tank level gauge 80 for detecting the liquid level and a primary water tank pH meter 75 for detecting the pH value. The primary water tank 78 is also provided with a primary water tank agitator 79 for mixing and homogenizing the water quality. The acid storage tank 67 and the secondary acid dosing pump 66 are connected to the primary water tank 78 through a pipeline. The secondary acid dosing pump 66 is interlocked with the primary water tank pH meter 75 and the primary water tank agitator 79. The start and stop of the secondary acid dosing pump 66 is controlled by the primary water tank pH meter 75 to control the pH value of the primary water tank 78 to be 6. 0-6.8 range; the primary water production tank 78 is connected to the secondary water inlet pump 73 through a secondary water inlet pipeline, and a secondary water inlet valve 74 is provided on the secondary water inlet pipeline, and the secondary water inlet valve 74 is connected to the secondary filter 48, the secondary high-pressure pump 46, the secondary circulation pump 36, the secondary material membrane membrane shell and the membrane assembly 33 through a pipeline through the secondary water inlet pipeline; the primary water production tank level meter 80, the primary water production tank pH meter 75, the primary water production tank mixer 79, the secondary acid dosing pump 66, the secondary water inlet pump 73, the secondary high-pressure pump 46, and the secondary circulation pump 36 are all electrically connected to the intelligent control system;

[0109] Among them, the secondary water inlet pipeline is provided with a secondary water inlet flowmeter 77, a secondary first water inlet pressure sensor 76 and a secondary second water inlet pressure sensor 47 for detecting the performance of the secondary filter 48, and a secondary third water inlet pressure sensor 44 for detecting the pressure after the secondary high-pressure pump 46; the secondary water inlet flowmeter 77, the secondary first water inlet pressure sensor 76, the secondary second water inlet pressure sensor 47, and the secondary third water inlet pressure sensor 44 are electrically connected to the intelligent control system; the filtering accuracy of the secondary filter 48 is ≤5um, and a core-type security filter is selected. When the pressure difference before and after the filtration is ≥1.0bar, the intelligent control system can automatically pop up an alarm to prompt the replacement of the filter element;

[0110] The antiscalant storage tank 41 and the secondary antiscalant dosing pump 39 are connected to the secondary water inlet pipeline through a pipeline, and the secondary antiscalant dosing pump 39 is electrically connected to the intelligent control system;

[0111] The secondary circulation pump 36 is connected to the secondary material membrane shell and the membrane assembly 33 through a pipeline, and the pipeline connecting the secondary circulation pump 36 with the secondary material membrane shell and the membrane assembly 33 is also provided with a secondary membrane inlet pressure sensor 42 for detecting the membrane inlet pressure; the secondary material membrane shell and the membrane assembly 33 are connected to the secondary concentrated liquid pipeline with a secondary membrane outlet pressure sensor 35 for detecting the membrane outlet pressure, and the secondary concentrated liquid pipeline is connected to the secondary water inlet pipeline to improve the system recovery rate; the secondary concentrated liquid pipeline is also provided with a secondary concentrated water regulating valve 37 and a secondary concentrated water flow The meter 34, the secondary concentrated water cleaning valve 50, and the secondary concentrated water discharge valve 82; the secondary concentrated water discharge valve 82 discharges through the secondary concentrated liquid pipeline, and after being softened to remove most of the divalent inorganic salts, enters the biochemical system for further treatment; the secondary concentrated water cleaning valve 50 is connected to the cleaning tank 71 through a pipeline; the secondary circulating pump 36, the secondary membrane inlet pressure sensor 42, the secondary membrane outlet pressure sensor 35, the secondary concentrated water regulating valve 37, the secondary concentrated water flowmeter 34, the secondary concentrated water cleaning valve 50, and the secondary concentrated water discharge valve 82 are all electrically connected to the intelligent control system;

[0112] Among them, the secondary section material membrane membrane shell and membrane assembly water production are connected through a secondary water production pipeline, and the secondary water production pipeline is provided with a secondary water production sampling valve 32 for manual detection and sampling, a secondary water production flow meter 43, a secondary water production conductivity meter 45, a secondary water production discharge valve 81, and a secondary water production cleaning valve 49; the secondary water production discharge valve 81 enters the secondary water production pipeline for deep treatment and discharges after meeting the standards, and the secondary water production cleaning valve 49 is connected to the cleaning box 71 through a pipeline, and the secondary water production flow meter 43, the secondary water production conductivity meter 45, the secondary water production discharge valve 81, and the secondary water production cleaning valve 49 are electrically connected to the intelligent control system;

[0113] The cleaning tank 71 is provided with a cleaning liquid level meter 59 for detecting the liquid level and a cleaning emptying valve 60 for emptying, and a cleaning pH meter 58 for detecting the pH value of the cleaning tank 71; the cleaning tank 71 is also provided with a tap water pipeline for replenishing water during cleaning and a cleaning mixer 72 for mixing and stirring to homogenize the cleaning water quality, and the tap water pipeline is connected to the cleaning tank 71 through a water replenishing valve; the cleaning liquid level meter 59, the cleaning emptying valve 60, the cleaning pH meter 58, the water replenishing valve, and the cleaning mixer 72 are all electrically connected to the intelligent control system;

[0114] The acid cleaning agent storage tank 69 and the alkaline cleaning agent storage tank 63 are connected to the cleaning tank 71 through pipelines with the acid cleaning agent dosing pump 62 and the alkaline cleaning agent dosing pump 61, respectively; the acid cleaning agent storage tank 69 and the alkaline cleaning agent storage tank 63 are also provided with an acid cleaning agent storage tank level gauge 70 and an alkaline cleaning agent storage tank level gauge 64 for detecting the liquid level. When the liquid level of the acid cleaning agent storage tank 69 and the alkaline cleaning agent storage tank 63 is lower than the set value, the intelligent control system will send out an alarm signal to prompt manual dosing; the acid cleaning agent storage tank level gauge 70 and the alkaline cleaning agent storage tank level gauge 64 are ultrasonic level gauges with strong corrosion resistance and high precision; the cleaning tank 71 and the cleaning tank 71 are connected to the cleaning tank 71 and the cleaning tank 71. The washing pump 57 is connected through a washing pipeline, and the washing pump 57 is connected to the primary water inlet pipeline through a first-stage washing water inlet valve 56 through a pipeline, and the washing pump 57 is connected to the primary water inlet pipeline after the first-stage washing water inlet valve 23 through a first-stage washing water inlet valve 55 through a pipeline, and the washing pump 57 is connected to the secondary water inlet pipeline through a pipeline through a secondary washing water inlet valve 54, and the washing pump 57, the first-stage washing water inlet valve 56, the first-stage washing water inlet valve 55, the secondary washing water inlet valve 54, the acidic detergent dosing pump 62, the alkaline detergent dosing pump 61, the acidic detergent storage tank level meter 70, and the alkaline detergent storage tank level meter 64 are all electrically connected to the intelligent control system;

[0115] Among them, the automatic cleaning landfill leachate nanofiltration concentrate reduction system includes three modes: operation mode, flushing mode, and chemical cleaning mode; it is operated through a computer software program.

[0116] Operation Mode:

[0117] Automatic control starts the operation mode. The specific steps of the operation mode are as follows:

[0118] ①. Press the "Start" button in the automatic mode of the nanofiltration concentrate reduction system; or meet the start conditions in the "Start" state;

[0119] ②, the liquid level of the nanofiltration concentrated water tank 3 reaches the set liquid level for starting the nanofiltration concentrated liquid reduction system, and the nanofiltration concentrated water tank mixer 2, the first-stage water inlet valve 6, the first-stage water production discharge valve 83, the first-stage concentrated water regulating valve 21 are opened 100%, the first-stage second-stage water inlet valve 23, the first-stage second-stage water production discharge valve 9, the first-stage second-stage concentrated water regulating valve 31 are opened 100%, and the first-stage second-stage concentrated water discharge valve 84 are automatically opened in sequence, and the valve action interval is 3 seconds. (If it is detected that the above valves are not opened, the startup procedure will be terminated and an alarm will be displayed);

[0120] ③. After confirming that all valves are fully opened, delay 10* seconds to start the first-stage water inlet pump 5 and the first-stage antiscalant dosing pump 40, delay 30* seconds to start the first-stage high-pressure pump 13 (frequency conversion*50Hz), delay 30* seconds to start the first-stage circulation pump 16, delay 60* seconds to adjust the opening degree of the first-stage concentrated water regulating valve 21 to the set pressure range (when the opening degree of the first-stage concentrated water regulating valve 21 is automatically adjusted by the set pressure, it is interlocked with the first-stage membrane outlet pressure sensor 19, and the pressure setting range is 10~20bar, which can be flexibly set according to the actual inlet water quality);

[0121] ④. After confirming that the opening degree of the first-stage concentrated water regulating valve 21 is adjusted to the right position, start the first-stage second-stage circulation pump 26 after a delay of 30* seconds, and adjust the opening degree of the first-stage second-stage concentrated water regulating valve 31 to the set pressure or flow range after a delay of 60* seconds (when the opening degree of the first-stage second-stage concentrated water regulating valve 31 is automatically adjusted by the set pressure, it is interlocked with the first-stage second-stage membrane outlet pressure sensor 28, and the pressure setting range is 10-20 bar, which is flexibly set according to the actual influent water quality; when the opening degree of the first-stage second-stage concentrated water regulating valve 31 is automatically adjusted by the set flow, it is interlocked with the first-stage second-stage concentrated water flowmeter 30, and the setting range of the first-stage second-stage concentrated water flowmeter 30 is flexibly set according to the system processing scale and the actual influent water quality);

[0122] ⑤. When the liquid level of the primary water tank 78 reaches the set start-up liquid level, the primary water tank mixer 79, the secondary water inlet valve 74, the secondary water discharge valve 81, the secondary concentrated water regulating valve 37 are opened 100%, and the secondary concentrated water discharge valve 82 are opened automatically in sequence. The valve action interval is 3 seconds. (If it is detected that the above valves are not opened, the startup procedure will be terminated and an alarm will be displayed);

[0123] ⑥. After confirming that the above valves are fully opened, start the secondary water inlet pump 73 and the secondary antiscalant dosing pump 39 with a delay of 10* seconds, start the secondary high-pressure pump 46 (frequency conversion*50Hz) with a delay of 30* seconds, start the secondary circulation pump 36 with a delay of 30* seconds, and adjust the opening degree of the secondary concentrated water regulating valve 37 to the set pressure or flow range with a delay of 60* seconds (when the opening degree of the secondary concentrated water regulating valve 37 is automatically adjusted by the set pressure, it is interlocked with the secondary membrane outlet pressure sensor 35, and the pressure setting range is 10-20bar, which is flexibly set according to the actual influent water quality; when the opening degree of the secondary concentrated water regulating valve 37 is automatically adjusted by the set flow, it is interlocked with the secondary concentrated water flowmeter 34, and the setting range of the secondary concentrated water flowmeter 34 is flexibly set according to the system processing scale and the actual influent water quality);

[0124] ⑦. The system enters automatic operation state;

[0125] ⑧. In the automatic operation state, when the liquid level of the nanofiltration concentrated water tank 3 reaches the set shutdown liquid level, the primary system automatically enters the shutdown program. When the liquid level of the nanofiltration concentrated water tank 3 reaches the set start liquid level, the primary system automatically starts to run, and the cycle repeats; when the liquid level of the primary production water tank 78 reaches the set shutdown liquid level, the secondary system automatically enters the shutdown program. When the liquid level of the primary production water tank 78 reaches the set start liquid level, the secondary system automatically starts to run, and the cycle repeats; in the automatic operation state, the operation and shutdown of the primary and secondary systems are interlocked with the liquid level of the nanofiltration concentrated water tank 3 and the liquid level of the primary production water tank 78 respectively;

[0126] ⑨. When the primary and secondary systems for nanofiltration concentrate reduction are in operation mode, the operation of the primary water inlet pump 5 is interlocked with the primary antiscalant dosing pump 40, that is, when the primary water inlet pump 5 is in operation mode, the primary antiscalant dosing pump 40 is in operation, and when the primary water inlet pump 5 is turned off, the primary antiscalant dosing pump 40 is turned off; the operation of the secondary water inlet pump 73 is interlocked with the secondary antiscalant dosing pump 39, that is, when the secondary water inlet pump 73 is in operation mode, the secondary antiscalant dosing pump 39 is in operation, and when the secondary water inlet pump 73 is turned off, the secondary antiscalant dosing pump 39 is closed; both the first-level antiscalant dosing pump 40 and the second-level antiscalant dosing pump 39 are corrosion-resistant mechanical diaphragm pumps with adjustable flow. The type and dosage of antiscalant can be flexibly selected and set according to the actual operation conditions; when the liquid level of the antiscalant storage tank 41 is lower than the set liquid level, an alarm signal is issued to prompt manual dosing. When the liquid level of the antiscalant storage tank 41 is lower than the set liquid level for a duration of ≥1 hour, the first and second level systems automatically enter the shutdown procedure. Before the low liquid level alarm of the antiscalant storage tank 41 is eliminated, the first and second level systems cannot enter the automatic operation state;

[0127] ⑩, when the pH value of the nanofiltration concentrated water tank PH meter 4 is set to a control range of 6.0 to 6.8 (which can be adjusted according to actual conditions); when the pH value of the nanofiltration concentrated water tank 3 is detected to be higher than 6.8, the system automatically turns on the primary acid dosing pump 65 for pH adjustment, and when the pH value of the nanofiltration concentrated water tank 3 is detected to be lower than 6.0, the system automatically turns off the primary acid dosing pump 65; when the pH value of the primary production water tank PH meter 75 is set to a control range of 6.0 to 6.8 (which can be adjusted according to actual conditions); when the pH value of the primary production water tank 78 is detected to be higher than 6.8, the system automatically turns on the secondary acid dosing pump 6 6. pH adjustment. When the pH value of the primary water production tank 78 is detected to be lower than 6.0, the system automatically shuts down the secondary acid dosing pump 66. The primary and secondary acid dosing pumps use corrosion-resistant mechanical diaphragm pumps with adjustable flow. The type of acid and the amount of dosing can be flexibly selected and set according to the actual operating conditions. When the liquid level of the acid storage tank 67 is lower than the set level, an alarm signal is issued to prompt manual dosing. When the liquid level of the acid storage tank 67 is lower than the set level for a duration of ≥1 hour, the primary and secondary systems automatically enter the shutdown procedure. Before the low liquid level alarm of the acid storage tank 67 is eliminated, the primary and secondary systems cannot enter the automatic operation state.

[0128] 11. When the pressure difference between the first level first water inlet pressure sensor 7 and the second level second water inlet pressure sensor 11 is ≥1.0 bar, an alarm signal is issued to prompt manual replacement of the filter element. When the pressure difference between the front and rear is lower than the set liquid level for ≥24 hours, the first level system automatically enters the shutdown procedure. Before the pressure difference alarm is eliminated, the first level system cannot enter the automatic operation state;

[0129] 12. When the pressure of the first-stage third water inlet pressure sensor 14 is higher than the set pressure range, an alarm signal is issued, and the first-stage system automatically enters the shutdown procedure to protect the first-stage high-pressure pump 13 and the membrane assembly. Before the high-pressure alarm is eliminated, the first-stage system cannot enter the automatic operation state;

[0130] 13. When the pressure difference between the secondary first water inlet pressure sensor 76 and the secondary second water inlet pressure sensor 47 is ≥1.0 bar, an alarm signal is issued to prompt manual replacement of the filter element. When the pressure difference between the front and rear is lower than the set liquid level for ≥24 hours, the secondary system automatically enters the shutdown procedure. Before the pressure difference alarm is eliminated, the secondary system cannot enter the automatic operation state;

[0131] 14. When the pressure of the secondary third water inlet pressure sensor 44 is higher than the set pressure range, an alarm signal is issued, and the secondary system automatically enters the shutdown procedure to protect the secondary high-pressure pump 46 and the membrane assembly. Before the high-pressure alarm is eliminated, the secondary system cannot enter the automatic operation state;

[0132] 15. When the first-stage water flow meter 22 shows that the water flow rate is lower than the set water flow rate for a duration of ≥24 hours, it will automatically prompt to perform fault inspection or cleaning;

[0133] 16. When the first-stage second-stage water flow meter 20 shows that the water flow rate is lower than the set water flow rate for a duration of ≥24 hours, it will automatically prompt to perform fault inspection or cleaning;

[0134] 17. When the secondary water flow meter shows that the water flow rate is lower than the set water flow rate for ≥24 hours, it will automatically prompt to perform fault inspection or cleaning;

[0135] 18. When the secondary produced water conductivity meter 45 shows that the produced water conductivity is higher than the set produced water conductivity value, an alarm signal is issued to prompt the user to perform a fault inspection or cleaning;

[0136] 19. When the pressure difference between the first-stage membrane inlet pressure sensor 15 and the first-stage membrane outlet pressure sensor 19 is greater than the set value, an alarm signal is issued to prompt manual adjustment or chemical cleaning. When the pressure difference between the first-stage membrane inlet pressure sensor 15 and the first-stage membrane outlet pressure sensor 19 is greater than the set value for a duration of ≥24 hours, the first-stage system automatically enters the shutdown program and pops up a dialog box to prompt chemical cleaning;

[0137] 20. When the pressure difference between the first-stage second-stage membrane inlet pressure sensor 25 and the first-stage second-stage membrane outlet pressure sensor 28 is greater than the set value, an alarm signal is issued to prompt manual adjustment or chemical cleaning. When the pressure difference between the first-stage second-stage membrane inlet pressure sensor 25 and the first-stage second-stage membrane outlet pressure sensor 28 is greater than the set value for a duration of ≥24 hours, the first-stage system automatically enters the shutdown program and pops up a dialog box to prompt chemical cleaning;

[0138] Among them, when the pressure difference between the secondary membrane inlet pressure sensor 42 and the secondary membrane outlet pressure sensor 35 is greater than the set value, an alarm signal is issued to prompt manual adjustment or chemical cleaning. When the pressure difference between the secondary membrane inlet pressure sensor 42 and the secondary membrane outlet pressure sensor 35 is greater than the set value for a duration of ≥24 hours, the secondary system automatically enters the shutdown program and pops up a dialog box to prompt chemical cleaning;

[0139] Among them, when any shutdown condition is triggered under the automatic operation state, the system automatically enters the shutdown program, and the first-level system automatically shuts down the program: the first-level second-stage concentrated water regulating valve 31 is opened 100%, the first-level first-stage concentrated water regulating valve 21 is opened 100%, the first-level first-stage produced water discharge valve 83, the first-level second-stage produced water discharge valve 9, the first-level second-stage concentrated water discharge valve 84, the first-level water inlet valve 6, the first-level second-stage water inlet valve 23, and the valve action interval is 3 seconds; after confirming that all valves are opened in place, delay 10* seconds to close the first-level second-stage circulation pump 26, delay 10* seconds to close the first-level first-stage circulation pump 16, delay 30* to close the first-level high-pressure pump 13 (frequency conversion*50Hz), delay 10* seconds to close the first-level water inlet pump 5, the first-level scale inhibitor dosing pump 40, and the nanofiltration concentrated water tank mixer 2; after confirming that all pumps are closed, delay 10* seconds to close the first-level water inlet valve 6; after confirming that all equipment is closed in place, delay 5* seconds for the first-level system to enter the standby state;

[0140] Among them, when any shutdown condition is triggered under the automatic operation state, the system automatically enters the shutdown procedure, and the secondary system automatically shuts down the procedure: the secondary concentrated water regulating valve 37 is opened 100%, the secondary water production discharge valve 81, the secondary concentrated water discharge valve 82, and the secondary water inlet valve 74 are opened in sequence, and the valve action interval is 3 seconds; after confirming that each valve is opened in place, the secondary circulation pump 36 is closed after a delay of 10* seconds, the secondary high-pressure pump 46 (frequency conversion*50Hz) is closed after a delay of 30* seconds, and the secondary water inlet pump 73, the secondary antiscalant dosing pump 39, and the primary water production tank mixer 79 are closed after a delay of 10* seconds; after confirming that each pump is closed, the secondary water inlet valve 74 is closed after a delay of 10* seconds; after confirming that each equipment is closed in place, the secondary system is transferred to the standby state after a delay of 5* seconds;

[0141] Clean water rinse mode:

[0142] When the continuous operation time of the nanofiltration concentrate reduction system in the automatic operation state is ≥ 24 hours (the specific time can be flexibly set according to the actual operation situation), the system automatically enters the shutdown program and completes the automatic shutdown of the system, triggering the flushing mode;

[0143] When the nanofiltration concentrate reduction system is automatically shut down after each chemical cleaning, the system triggers the flushing mode;

[0144] When the system triggers the flushing mode, a prompt dialog box will pop up automatically, and you can flexibly select the primary system flushing mode or the secondary system flushing mode according to the actual operation of the system; the primary system flushing mode is divided into three flushing modes: primary system flushing mode, primary one-stage system flushing mode, and primary two-stage system flushing mode, with a total of 4 flushing modes;

[0145] The flushing mode operation conditions are automatically triggered by running the computer software program, and a dialog box pops up to prompt manual judgment to select any of the four flushing modes: the first-stage system flushing mode, the first-stage system flushing mode, the first-stage system flushing mode, the second-stage system flushing mode, and the second-stage system flushing mode.

[0146] Among them, the first-level system flushing mode is as follows:

[0147] ①. When the liquid level of the cleaning tank 71 reaches the set start level, the first-stage cleaning water inlet valve 56, the first-stage water production cleaning valve 51, the first-stage concentrated water regulating valve 21 are opened 100%, the first-stage second-stage water inlet valve 23, the first-stage second-stage water production cleaning valve 53, the first-stage second-stage concentrated water regulating valve 31 are opened 100%, and the first-stage second-stage concentrated water discharge valve 84 are opened in sequence. The valve action interval is 3 seconds. (If it is detected that the above valves are not opened, the execution of the program will be terminated and an alarm will be displayed);

[0148] ②. After confirming that all valves are fully opened, start the cleaning pump 57 with a delay of 10* seconds, start the first-stage high-pressure pump 13 (frequency conversion*35Hz) with a delay of 10* seconds, start the first-stage circulation pump 16 with a delay of 10* seconds, and start the first-stage second-stage circulation pump 26 with a delay of 10* seconds;

[0149] ③, delay 120* seconds to open the first-stage second-stage concentrated water cleaning valve 52, and after confirming that the valve is fully opened, delay 10* seconds to close the first-stage second-stage concentrated water discharge valve 84;

[0150] ④. The system automatically enters the primary system flushing mode. When the primary system flushing time reaches the set time or the set pH value, the primary system flushing mode shutdown program is triggered, and the primary second-stage circulation pump 26 is automatically closed with a delay of 10* seconds, the primary first-stage circulation pump 16 is automatically closed with a delay of 10* seconds, the primary high-pressure pump 13 (frequency conversion*35Hz) is automatically closed with a delay of 30* seconds, and the cleaning pump 57 is automatically closed with a delay of 10* seconds. After confirming that all pumps are closed, the primary first-stage cleaning water inlet valve 56 and the primary Open the first stage water production cleaning valve 51, the first stage concentrated water regulating valve 21, the first stage second water inlet valve 23, the first stage second water production cleaning valve 53, the first stage second concentrated water regulating valve 31, the first stage second concentrated water cleaning valve 52, the first stage first stage water production discharge valve 83, the first stage second water production discharge valve 9, the first stage second concentrated liquid discharge valve, and the cleaning and emptying valve 60 (when the liquid level of the cleaning tank 71 is ≤0m, the cleaning and emptying valve 60 is automatically closed). After confirming that all equipment is closed or opened in place, the system will enter the standby state after a delay of 5* seconds;

[0151] ⑤. When the cleaning tank 71 does not reach the set liquid level, the primary system flushing mode cannot be started to protect the cleaning pump 57. In the primary system flushing mode, when the cleaning tank 71 is lower than the set liquid level, the water replenishment valve is automatically opened to replenish tap water. When the set maximum liquid level is reached, the water replenishment valve is automatically closed to ensure the effect of the primary system flushing mode;

[0152] Among them, the flushing mode of the first stage system is as follows:

[0153] ①. When the liquid level of the cleaning tank 71 reaches the set start level, the first-stage cleaning water inlet valve 56, the first-stage water production cleaning valve 51, the first-stage concentrated water regulating valve 21 are opened 100% in sequence, and the first-stage concentrated water cleaning valve 85 is opened, and the valve action interval is 3 seconds. (If it is detected that the above valves are not opened, the execution of the program is terminated and an alarm is displayed);

[0154] ② After confirming that all valves are fully opened, delay 10* seconds to start the cleaning pump 57, delay 10* seconds to start the first-stage high-pressure pump 13 (frequency conversion*35Hz), and delay 10* seconds to start the first-stage circulation pump 16;

[0155] ③. The system automatically enters the flushing mode of the first-stage system. When the flushing time of the first-stage system reaches the set time or the set pH value, the shutdown program of the first-stage system flushing mode is triggered, and the first-stage circulation pump 16 is automatically closed with a delay of 10* seconds, the first-stage high-pressure pump 13 (frequency conversion*35Hz) is automatically closed with a delay of 30* seconds, and the cleaning pump 57 is automatically closed with a delay of 10* seconds. After confirming that all pumps are closed, the first-stage cleaning water inlet valve 56, the first-stage water production cleaning valve 51, the first-stage concentrated water regulating valve 21, and the first-stage concentrated water cleaning valve 85 are closed with a delay of 10* seconds, and the first-stage water production discharge valve 83 and the cleaning drain valve 60 are opened (when the liquid level of the cleaning tank 71 is ≤0m, the cleaning drain valve 60 is automatically closed). After confirming that all equipment is closed or opened in place, the system is switched to standby mode with a delay of 5* seconds;

[0156] ④. When the cleaning tank 71 does not reach the set liquid level, the flushing mode of the first-stage system cannot be started to protect the cleaning pump 57. In the flushing mode of the first-stage system, when the cleaning tank 71 is lower than the set liquid level, the water replenishment valve is automatically opened to replenish tap water. When the set maximum liquid level is reached, the water replenishment valve is automatically closed to ensure the effect of the flushing mode of the first-stage system;

[0157] Among them, the flushing mode of the first-stage and second-stage systems is as follows:

[0158] ①. When the liquid level of the cleaning tank 71 reaches the set start level, open the first-stage second-stage cleaning water inlet valve 55, the first-stage second-stage water production cleaning valve 53, the first-stage second-stage concentrated water regulating valve 31 100% in sequence, and the first-stage second-stage concentrated water discharge valve 84, and the valve action interval is 3 seconds. (If it is detected that the above valves are not opened, the execution program will be terminated and an alarm will be displayed);

[0159] ② After confirming that all valves are fully opened, start the cleaning pump 57 with a delay of 10* seconds, and start the first-stage second-stage circulation pump 26 with a delay of 10* seconds;

[0160] ③, delay 120* seconds to open the first-stage second-stage concentrated water cleaning valve 52, and after confirming that the valve is fully opened, delay 10* seconds to close the first-stage second-stage concentrated water discharge valve 84;

[0161] ④. The system automatically enters the flushing mode of the first-stage and second-stage system. When the flushing time of the first-stage and second-stage system reaches the set time or the set pH value, the shutdown program of the flushing mode of the first-stage and second-stage system is triggered, and the first-stage and second-stage circulation pump 26 is automatically closed with a delay of 10* seconds, and the cleaning pump 57 is automatically closed with a delay of 10* seconds. After confirming that all pumps are closed, the first-stage and second-stage cleaning water inlet valve 55, the first-stage and second-stage water production cleaning valve 53, the first-stage and second-stage concentrated water regulating valve 31, and the first-stage and second-stage concentrated water cleaning valve 52 are closed with a delay of 10* seconds, and the first-stage and second-stage water production discharge valve 9 and the cleaning drain valve 60 are opened (when the liquid level of the cleaning tank 71 is ≤0m, the cleaning drain valve 60 is automatically closed). After confirming that all equipment is closed or opened in place, the system is transferred to the standby state with a delay of 5* seconds;

[0162] ⑤. When the cleaning tank 71 does not reach the set liquid level, the first-stage two-stage system flushing mode cannot be started to protect the cleaning pump 57. In the first-stage two-stage system flushing mode, when the cleaning tank 71 is lower than the set liquid level, the water replenishment valve is automatically opened to replenish tap water. When the set maximum liquid level is reached, the water replenishment valve is automatically closed to ensure the effect of the first-stage two-stage system flushing mode;

[0163] Among them, the secondary system flushing mode is as follows:

[0164] ①. When the liquid level of the cleaning tank 71 reaches the set start level, open the secondary cleaning water inlet valve 54, the secondary water production cleaning valve 49, the secondary concentrated water regulating valve 37 100% in sequence, and the secondary concentrated water discharge valve 82, with a valve action interval of 3 seconds. (If it is detected that the above valves are not open, the execution of the program will be terminated and an alarm will be displayed);

[0165] ② After confirming that all valves are fully opened, delay 10* seconds to start the cleaning pump 57, delay 10* seconds to start the secondary high-pressure pump 46 (frequency conversion*35Hz), and delay 10* seconds to start the secondary circulation pump 36;

[0166] ③, open the secondary concentrated water cleaning valve 50 with a delay of 120* seconds, and after confirming that the valve is fully opened, close the secondary concentrated water discharge valve 82 with a delay of 10* seconds;

[0167] ④. The system automatically enters the secondary system flushing mode. When the secondary system flushing time reaches the set time or the set pH value, the secondary system flushing mode shutdown program is triggered, and the secondary circulation pump 36 is automatically closed with a delay of 10* seconds, the secondary high-pressure pump 46 (frequency conversion*35Hz) is automatically closed with a delay of 30* seconds, and the cleaning pump 57 is automatically closed with a delay of 10* seconds. After confirming that all pumps are closed, the secondary cleaning water inlet valve 54, the secondary water production cleaning valve 49, the secondary concentrated water regulating valve 37, and the secondary concentrated water cleaning valve 50 are closed with a delay of 10* seconds, and the secondary water production discharge valve 81 and the cleaning drain valve 60 are opened (when the liquid level of the cleaning tank 71 is ≤0m, the cleaning drain valve 60 is automatically closed). After confirming that all equipment is closed or opened in place, the system is delayed for 5* seconds to enter the standby state;

[0168] ⑤. When the cleaning tank 71 does not reach the set liquid level, the secondary system flushing mode cannot be started to protect the cleaning pump 57. In the secondary system flushing mode, when the cleaning tank 71 is lower than the set liquid level, the water replenishment valve is automatically opened to replenish tap water. When the set maximum liquid level is reached, the water replenishment valve is automatically closed to ensure the effect of the secondary system flushing mode;

[0169] Chemical cleaning mode:

[0170] In this embodiment, the chemical cleaning mode is divided into two programs: acidic chemical cleaning and alkaline chemical cleaning. The computer software program runs to automatically trigger the chemical cleaning mode operation conditions, and a dialog box pops up to prompt manual judgment to select the acidic chemical cleaning or alkaline chemical cleaning program;

[0171] Among them, when the continuous operation time of the nanofiltration concentrate reduction system in the automatic operation state is ≥360 hours (the specific setting can be flexibly performed according to the actual operation conditions), the system automatically enters the shutdown program to complete the automatic shutdown of the system, and automatically triggers the chemical cleaning mode operation conditions, and a dialog box pops up to prompt manual judgment to select the acid chemical cleaning or alkaline chemical cleaning program;

[0172] When the operating conditions of the chemical cleaning mode are triggered, a dialog box pops up to prompt manual judgment to select the acid chemical cleaning or alkaline chemical cleaning program. Eight chemical cleaning programs can be flexibly selected according to the actual operation of the system, including the first-stage system acid chemical cleaning or alkaline chemical cleaning program, the first-stage system acid chemical cleaning or alkaline chemical cleaning program, the first-stage two-stage system acid chemical cleaning or alkaline chemical cleaning program mode, and the second-stage system acid chemical cleaning or alkaline chemical cleaning program.

[0173] Among them, the acid chemical cleaning procedure of the first-level system is as follows:

[0174] ①. Manually select and determine the acid chemical cleaning procedure for the first-level system and enter the acid chemical cleaning procedure for the first-level system;

[0175] ②. When the pressure difference between the first-stage membrane inlet pressure sensor 15 and the first-stage membrane outlet pressure sensor 19 is greater than the set value for a duration of ≥24 hours or the pressure difference between the first-stage membrane inlet pressure sensor 25 and the first-stage membrane outlet pressure sensor 28 is greater than the set value for a duration of ≥24 hours (the specific setting can be flexibly made according to the actual operation conditions), the first-stage system automatically enters the shutdown program. After the system automatically shuts down, the chemical cleaning mode operation conditions are automatically triggered, and a dialog box pops up to prompt manual judgment to select any one of the eight chemical cleaning programs, namely, the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage system acidic chemical cleaning or alkaline chemical cleaning program mode, and the second-stage system acidic chemical cleaning or alkaline chemical cleaning program. After manually selecting and confirming the first-stage system acidic chemical cleaning program, the first-stage system acidic chemical cleaning program is entered;

[0176] ③. When the first-stage water flow meter 22 shows that the water flow duration is ≥24 hours (which can be flexibly set according to the actual operation situation) lower than the set water flow, or when the first-stage second-stage water flow meter 20 shows that the water flow duration is ≥24 hours (which can be flexibly set according to the actual operation situation) lower than the set water flow, the system automatically enters the shutdown program. After the system automatically shuts down, the chemical cleaning mode operation conditions are automatically triggered, and a dialog box pops up to prompt manual judgment to select any one of the eight chemical cleaning programs of the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage first-stage system acidic chemical cleaning or alkaline chemical cleaning program mode, and the second-stage system acidic chemical cleaning or alkaline chemical cleaning program. After manually selecting and confirming the first-stage system acidic chemical cleaning program, enter the first-stage system acidic chemical cleaning program;

[0177] ④. When any of the conditions for automatically triggering the chemical cleaning mode appears, a dialog box pops up to prompt manual judgment to select any one of the eight chemical cleaning programs: the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage two-stage system acidic chemical cleaning or alkaline chemical cleaning program mode, and the second-stage system acidic chemical cleaning or alkaline chemical cleaning program. After manually selecting and confirming the first-stage system acidic chemical cleaning program, enter the first-stage system acidic chemical cleaning program;

[0178] ⑤. Open the water supply valve, set the liquid level through the liquid level gauge of the cleaning tank 71 to control the opening and closing of the cleaning water supply valve, and automatically close the cleaning water supply valve when the liquid level in the cleaning tank 71 reaches the set liquid level value;

[0179] ⑥. Turn on the cleaning mixer 72 and the acid cleaning agent dosing pump 62 in sequence. When the pH value in the cleaning tank 71 is ≤2, the acid cleaning agent dosing pump 62 is automatically turned off. When the pH value in the cleaning tank 71 is ≥3, the acid cleaning agent dosing pump 62 is automatically turned on. The acid cleaning agent dosing pump 62 is interlocked with the cleaning pH meter 58 to control the pH value in the cleaning tank 71 during the acid chemical cleaning process.

[0180] ⑦. Open the first stage cleaning water inlet valve 56, the first stage water production cleaning valve 51, the first stage concentrated water regulating valve 21 100%, the first stage second stage water inlet valve 23, the first stage second stage water production cleaning valve 53, the first stage second stage concentrated water regulating valve 31 100%, and the first stage second stage concentrated water cleaning valve 52 in sequence. The valve action interval is 3 seconds. (If it is detected that the above valves are not open, the execution program will be terminated and an alarm will be displayed);

[0181] ⑧. After confirming that all valves are fully opened, start the cleaning pump 57 with a delay of 10* seconds, start the first-stage high-pressure pump 13 (frequency conversion*35Hz) with a delay of 10* seconds, start the first-stage circulation pump 16 with a delay of 10* seconds, and start the first-stage second-stage circulation pump 26 with a delay of 10* seconds;

[0182] ⑨. The system automatically enters the acid chemical cleaning program of the first-level system. When the chemical cleaning time of the first-level system reaches the set time, the acid chemical cleaning shutdown program of the first-level system is triggered. The first-level second-stage circulation pump 26 is automatically closed with a delay of 10* seconds, the first-level first-stage circulation pump 16 is closed with a delay of 10* seconds, the first-level high-pressure pump 13 (frequency conversion*35Hz) is closed with a delay of 30* seconds, and the cleaning pump 57 is closed with a delay of 10* seconds. After confirming that all pumps are closed, the first-level first-stage cleaning water inlet valve 56, the first-level first-stage water production cleaning valve 51, the first-level first-stage concentrated water regulating valve 21, the first-level second-stage water inlet valve 23, the first-level second-stage water production cleaning valve 53, the first-level second-stage concentrated water regulating valve 31, and the first-level second-stage concentrated water cleaning valve 52 are closed with a delay of 10* seconds, and the cleaning drain valve 60 is opened (when the liquid level of the cleaning tank 71 is ≤0m, the cleaning drain valve 60 is automatically closed). After confirming that all equipment is closed or opened in place, the system automatically triggers the flushing program with a delay of 5* seconds. After manual selection and confirmation, it enters the flushing mode;

[0183] ⑩. When the liquid level of the acid cleaning agent storage tank 69 is lower than the set value, the acid chemical cleaning program of the first-level system cannot be started to ensure the acid chemical cleaning effect. At the same time, an alarm signal pops up automatically to prompt manual dosing. Before the low liquid level alarm of the acid cleaning agent storage tank 69 is eliminated, the first-level system cannot enter the operation mode or chemical cleaning mode;

[0184] Among them, the acid chemical cleaning procedure for the first stage system is as follows:

[0185] ①. Manually select and determine the acid chemical cleaning program for the first-stage and first-stage systems, and enter the acid chemical cleaning program for the first-stage and first-stage systems;

[0186] ②. When the pressure difference between the first-stage membrane inlet pressure sensor 15 and the first-stage membrane outlet pressure sensor 19 is greater than the set value for a duration of ≥24 hours (which can be flexibly set according to the actual operating conditions), the first-stage system automatically enters the shutdown program. After the system automatically shuts down, the chemical cleaning mode operation conditions are automatically triggered, and a dialog box pops up to prompt manual judgment to select any one of the eight chemical cleaning programs: the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage second-stage system acidic chemical cleaning or alkaline chemical cleaning program mode, and the second-stage system acidic chemical cleaning or alkaline chemical cleaning program. After manually selecting and confirming the first-stage first-stage system acidic chemical cleaning program, enter the first-stage first-stage system acidic chemical cleaning program;

[0187] ③. When the first-stage first-stage water flow meter 22 shows that the water flow duration is ≥24 hours (which can be flexibly set according to the actual operation situation) and is lower than the set water flow, the system automatically enters the shutdown program. After the system automatically shuts down, the chemical cleaning mode operation conditions are automatically triggered, and a dialog box pops up to prompt manual judgment to select any one of the eight chemical cleaning programs: the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage second-stage system acidic chemical cleaning or alkaline chemical cleaning program mode, and the second-stage system acidic chemical cleaning or alkaline chemical cleaning program. After manually selecting and confirming the first-stage first-stage system acidic chemical cleaning program, enter the first-stage first-stage system acidic chemical cleaning program;

[0188] ④. When any of the conditions for automatically triggering the chemical cleaning mode appears, a dialog box pops up to prompt manual judgment to select any one of the eight chemical cleaning programs, including the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage two-stage system acidic chemical cleaning or alkaline chemical cleaning program mode, and the second-stage system acidic chemical cleaning or alkaline chemical cleaning program. After manually selecting and confirming the first-stage system acidic chemical cleaning program, enter the first-stage system acidic chemical cleaning program;

[0189] ⑤. Open the water supply valve, set the liquid level through the liquid level gauge of the cleaning tank 71 to control the opening and closing of the cleaning water supply valve, and automatically close the cleaning water supply valve when the liquid level in the cleaning tank 71 reaches the set liquid level value;

[0190] ⑥. Turn on the cleaning mixer 72 and the acid cleaning agent dosing pump 62 in sequence. When the pH value in the cleaning tank 71 is ≤2, the acid cleaning agent dosing pump is automatically turned off. When the pH value in the cleaning tank 71 is ≥3, the acid cleaning agent dosing pump is automatically turned on. The acid cleaning agent dosing pump 62 is interlocked with the cleaning pH meter 58 to control the pH value in the cleaning tank 71 during the acid chemical cleaning process.

[0191] ⑦. Open the first stage cleaning water inlet valve 56, the first stage water production cleaning valve 51, the first stage concentrated water regulating valve 21 100%, and the first stage concentrated water cleaning valve 85 in sequence. The valve action interval is 3 seconds. (If it is detected that the above valves are not opened, the execution program will be terminated and an alarm will be displayed);

[0192] ⑧. After confirming that all valves are fully opened, delay 10* seconds to start the cleaning pump 57, delay 10* seconds to start the first-stage high-pressure pump 13 (frequency conversion*35Hz), and delay 10* seconds to start the first-stage circulation pump 16;

[0193] ⑨. The system automatically enters the acid chemical cleaning program of the first stage and the first stage system. When the chemical cleaning time of the first stage and the first stage system reaches the set time, the acid chemical cleaning shutdown program of the first stage and the first stage system is triggered, and the first stage and the first stage circulation pump 16 is automatically closed with a delay of 10* seconds, the first stage high pressure pump 13 (frequency conversion*35Hz) is automatically closed with a delay of 30* seconds, and the cleaning pump 57 is automatically closed with a delay of 10* seconds. After confirming that all pumps are closed, the first stage and the first stage cleaning water inlet valve 56, the first stage and the first stage water production cleaning valve 51, the first stage and the first stage concentrated water regulating valve 21, and the first stage and the first stage concentrated water cleaning valve 85 are closed with a delay of 10* seconds, and the cleaning drain valve 60 is opened (when the liquid level of the cleaning tank 71 is ≤0m, the cleaning drain valve 60 is automatically closed). After confirming that all equipment is closed or opened in place, the system automatically triggers the flushing program with a delay of 5* seconds, and enters the flushing mode after manual selection and confirmation;

[0194] ⑩. When the liquid level of the acid cleaning agent storage tank 69 is lower than the set value, the acid chemical cleaning program of the first stage system cannot be started to ensure the acid chemical cleaning effect. At the same time, an alarm signal will automatically pop up to prompt manual dosing. Before the low liquid level alarm of the acid cleaning agent storage tank 69 is eliminated, the first stage system cannot enter the operation mode or chemical cleaning mode;

[0195] Among them, the acid chemical cleaning procedure of the first-stage and second-stage systems is as follows:

[0196] ①. Manually select and determine the acid chemical cleaning procedure for the first-stage and second-stage systems, and enter the acid chemical cleaning procedure for the first-stage and second-stage systems;

[0197] ②. When the pressure difference between the first-stage and second-stage membrane inlet pressure sensor 25 and the first-stage and second-stage membrane outlet pressure sensor 28 is greater than the set value for a duration of ≥24 hours (which can be flexibly set according to the actual operating conditions), the first-stage system automatically enters the shutdown program. After the system automatically shuts down, the chemical cleaning mode operation conditions are automatically triggered, and a dialog box pops up to prompt manual judgment to select any one of the eight chemical cleaning programs: the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage and first-stage system acidic chemical cleaning or alkaline chemical cleaning program mode, and the second-stage system acidic chemical cleaning or alkaline chemical cleaning program. After manually selecting and determining the first-stage and second-stage system acidic chemical cleaning program, enter the first-stage and second-stage system acidic chemical cleaning program;

[0198] ③. When the first-stage and second-stage water flow meter 20 shows that the water flow duration is ≥24 hours (which can be flexibly set according to the actual operation situation) and is lower than the set water flow, the system automatically enters the shutdown program. After the system automatically shuts down, the chemical cleaning mode operation conditions are automatically triggered, and a dialog box pops up to prompt manual judgment to select any one of the eight chemical cleaning programs, namely, the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage and first-stage system acidic chemical cleaning or alkaline chemical cleaning program mode, and the second-stage system acidic chemical cleaning or alkaline chemical cleaning program. After manually selecting and confirming the first-stage and second-stage system acidic chemical cleaning program, the first-stage and second-stage system acidic chemical cleaning program is entered;

[0199] ④. When any of the conditions for automatically triggering the chemical cleaning mode appears, a dialog box pops up to prompt manual judgment to select any one of the eight chemical cleaning programs, including the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage two-stage system acidic chemical cleaning or alkaline chemical cleaning program mode, and the second-stage system acidic chemical cleaning or alkaline chemical cleaning program. After manually selecting and confirming the first-stage two-stage system acidic chemical cleaning program, enter the first-stage two-stage system acidic chemical cleaning program;

[0200] ⑤. Open the water supply valve, set the liquid level through the liquid level gauge of the cleaning tank 71 to control the opening and closing of the cleaning water supply valve, and automatically close the cleaning water supply valve when the liquid level in the cleaning tank 71 reaches the set liquid level value;

[0201] ⑥. Turn on the cleaning mixer 72 and the acid cleaning agent dosing pump 62 in sequence. When the pH value in the cleaning tank 71 is ≤2, the acid cleaning agent dosing pump is automatically turned off. When the pH value in the cleaning tank 71 is ≥3, the acid cleaning agent dosing pump is automatically turned on. The acid cleaning agent dosing pump 62 is interlocked with the cleaning pH meter 58 to control the pH value in the cleaning tank 71 during the acid chemical cleaning process.

[0202] ⑦. Open the first-stage second-stage cleaning water inlet valve 55, the first-stage second-stage water production cleaning valve 53, the first-stage second-stage concentrated water regulating valve 31 100%, and the first-stage second-stage concentrated water cleaning valve 52 in sequence. The valve action interval is 3 seconds. (If it is detected that the above valves are not open, the execution program will be terminated and an alarm will be displayed);

[0203] ⑧. After confirming that all valves are fully opened, start the cleaning pump 57 with a delay of 10* seconds, and start the first-stage second-stage circulation pump 26 with a delay of 10* seconds;

[0204] ⑨. The system automatically enters the first-stage two-stage system acid chemical cleaning program. When the first-stage two-stage system chemical cleaning time reaches the set time, the first-stage two-stage system acid chemical cleaning shutdown program is triggered, and the first-stage two-stage circulation pump 26 is automatically closed for 10* seconds, and the cleaning pump 57 is automatically closed for 10* seconds. After confirming that all pumps are closed, the first-stage two-stage cleaning water inlet valve 55, the first-stage two-stage water production cleaning valve 53, the first-stage two-stage concentrated water regulating valve 31, and the first-stage two-stage concentrated water cleaning valve 52 are closed for 10* seconds, and the cleaning drain valve 60 is opened (when the liquid level of the cleaning tank 71 is ≤0m, the cleaning drain valve 60 is automatically closed). After confirming that all equipment is closed or opened in place, the system automatically triggers the flushing program with a delay of 5* seconds. After manual selection and confirmation, it enters the flushing mode;

[0205] ⑩. When the liquid level of the acid cleaning agent storage tank 69 is lower than the set value, the acid chemical cleaning program of the first stage system cannot be started to ensure the acid chemical cleaning effect. At the same time, an alarm signal will automatically pop up to prompt manual dosing. Before the low liquid level alarm of the acid cleaning agent storage tank 69 is eliminated, the first stage system cannot enter the operation mode or chemical cleaning mode;

[0206] Among them, the secondary system acid chemical cleaning procedure is as follows:

[0207] ①. Manually select and determine the secondary system acid chemical cleaning procedure and enter the secondary system acid chemical cleaning procedure;

[0208] ②. When the pressure difference between the secondary membrane inlet pressure sensor 42 and the secondary membrane outlet pressure sensor 35 is greater than the set value for a duration of ≥24 hours (which can be flexibly set according to the actual operating conditions), the secondary system automatically enters the shutdown program. After the system automatically shuts down, the chemical cleaning mode operation conditions are automatically triggered, and a dialog box pops up to prompt manual judgment to select any one of the eight chemical cleaning programs: the primary system acid chemical cleaning or alkaline chemical cleaning program, the primary first stage system acid chemical cleaning or alkaline chemical cleaning program, the primary second stage system acid chemical cleaning or alkaline chemical cleaning program mode, and the secondary system acid chemical cleaning or alkaline chemical cleaning program. After manually selecting and confirming the secondary system acid chemical cleaning program, enter the secondary system acid chemical cleaning program;

[0209] ③. When the secondary water production flow meter 43 shows that the water production flow duration is ≥24 hours (which can be flexibly set according to the actual operation situation) and is lower than the set water production flow, the system automatically enters the shutdown program. After the system automatically shuts down, the chemical cleaning mode operation conditions are automatically triggered, and a dialog box pops up to prompt manual judgment to select any one of the eight chemical cleaning programs: the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage two-stage system acidic chemical cleaning or alkaline chemical cleaning program mode, and the second-stage system acidic chemical cleaning or alkaline chemical cleaning program. After manually selecting and confirming the second-stage system acidic chemical cleaning program, enter the second-stage system acidic chemical cleaning program;

[0210] ④. When any of the conditions for automatically triggering the chemical cleaning mode appears, a dialog box pops up to prompt manual judgment to select any one of the eight chemical cleaning programs: the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage second-stage system acidic chemical cleaning or alkaline chemical cleaning program mode, and the second-stage system acidic chemical cleaning or alkaline chemical cleaning program. After manually selecting and confirming the second-stage system acidic chemical cleaning program, enter the second-stage system acidic chemical cleaning program;

[0211] ⑤. Open the water supply valve, set the liquid level through the liquid level gauge of the cleaning tank 71 to control the opening and closing of the cleaning water supply valve, and automatically close the cleaning water supply valve when the liquid level in the cleaning tank 71 reaches the set liquid level value;

[0212] ⑥. Turn on the cleaning mixer 72 and the acid cleaning agent dosing pump 62 in sequence. When the pH value in the cleaning tank 71 is ≤2, the acid cleaning agent dosing pump is automatically turned off. When the pH value in the cleaning tank 71 is ≥3, the acid cleaning agent dosing pump is automatically turned on. The acid cleaning agent dosing pump 62 is interlocked with the cleaning pH meter 58 to control the pH value in the cleaning tank 71 during the acid chemical cleaning process.

[0213] ⑦. Open the secondary cleaning water inlet valve 54, the secondary water production cleaning valve 49, the secondary concentrated water regulating valve 37 100%, and the secondary concentrated water cleaning valve 50 in sequence. The valve action interval is 3 seconds. (If it is detected that the above valves are not open, the execution program will be terminated and an alarm will be displayed);

[0214] ⑧. After confirming that all valves are fully opened, delay 10* seconds to start the cleaning pump 57, delay 30* seconds to start the secondary high-pressure pump 46 (frequency conversion*35Hz), and delay 10* seconds to start the secondary circulation pump 36;

[0215] ⑨. The system automatically enters the secondary system acid chemical cleaning program. When the secondary system chemical cleaning time reaches the set time, the secondary system acid chemical cleaning shutdown program is triggered, and the secondary circulation pump 36 is automatically closed with a delay of 10* seconds, the secondary high-pressure pump 46 (frequency conversion*35Hz) is closed with a delay of 30* seconds, and the cleaning pump 57 is closed with a delay of 10* seconds. After confirming that all pumps are closed, the secondary cleaning water inlet valve 54, the secondary water production cleaning valve 49, the secondary concentrated water regulating valve 37, and the secondary concentrated water cleaning valve 50 are closed with a delay of 10* seconds, and the cleaning drain valve 60 is opened (when the liquid level of the cleaning tank 71 is ≤0m, the cleaning drain valve 60 is automatically closed). After confirming that all equipment is closed or opened in place, the system automatically triggers the flushing program with a delay of 5* seconds. After manual selection and confirmation, it enters the flushing mode;

[0216] ⑩. When the liquid level of the acid cleaning agent storage tank 69 is lower than the set value, the acid chemical cleaning program of the first stage system cannot be started to ensure the acid chemical cleaning effect. At the same time, an alarm signal will automatically pop up to prompt manual dosing. Before the low liquid level alarm of the acid cleaning agent storage tank 69 is eliminated, the first stage system cannot enter the operation mode or chemical cleaning mode;

[0217] Among them, the alkaline chemical cleaning procedure of the first-level system is as follows:

[0218] ①. Manually select and determine the primary system alkaline chemical cleaning program and enter the primary system alkaline chemical cleaning program;

[0219] ②. When the pressure difference between the first-stage membrane inlet pressure sensor 15 and the first-stage membrane outlet pressure sensor 19 is greater than the set value for a duration of ≥24 hours or the pressure difference between the first-stage membrane inlet pressure sensor 25 and the first-stage membrane outlet pressure sensor 28 is greater than the set value for a duration of ≥24 hours (the specific setting can be flexibly made according to the actual operation conditions), the first-stage system automatically enters the shutdown program. After the system automatically shuts down, the chemical cleaning mode operation conditions are automatically triggered, and a dialog box pops up to prompt manual judgment to select any one of the eight chemical cleaning programs, namely, the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage system acidic chemical cleaning or alkaline chemical cleaning program mode, and the second-stage system acidic chemical cleaning or alkaline chemical cleaning program. After manually selecting and confirming the alkaline chemical cleaning program of the first-stage system, the first-stage system alkaline chemical cleaning program enters the alkaline chemical cleaning program of the first-stage system;

[0220] ③. When the first-stage water flow meter 22 shows that the water flow duration is ≥24 hours (which can be flexibly set according to the actual operation situation) lower than the set water flow, or when the first-stage second-stage water flow meter 20 shows that the water flow duration is ≥24 hours (which can be flexibly set according to the actual operation situation) lower than the set water flow, the system automatically enters the shutdown program. After the system automatically shuts down, the chemical cleaning mode operation conditions are automatically triggered, and a dialog box pops up to prompt manual judgment to select any one of the eight chemical cleaning programs of the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage first-stage system acidic chemical cleaning or alkaline chemical cleaning program mode, and the second-stage system acidic chemical cleaning or alkaline chemical cleaning program. After manually selecting and confirming the first-stage system alkaline chemical cleaning program, enter the first-stage system alkaline chemical cleaning program;

[0221] ④. When any of the conditions for automatically triggering the chemical cleaning mode appears, a dialog box pops up to prompt manual judgment to select any one of the eight chemical cleaning programs: the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage two-stage system acidic chemical cleaning or alkaline chemical cleaning program mode, and the second-stage system acidic chemical cleaning or alkaline chemical cleaning program. After manually selecting and confirming the first-stage system acidic chemical cleaning program, enter the first-stage system alkaline chemical cleaning program;

[0222] ⑤. Open the water supply valve, set the liquid level through the liquid level gauge of the cleaning tank 71 to control the opening and closing of the cleaning water supply valve, and automatically close the cleaning water supply valve when the liquid level in the cleaning tank 71 reaches the set liquid level value;

[0223] ⑥. Turn on the cleaning mixer 72 and the alkaline cleaning agent dosing pump 61 in sequence. When the pH value in the cleaning tank 71 is ≤10.5, the alkaline cleaning agent dosing pump 61 is automatically turned on to run. When the pH value in the cleaning tank 71 is ≥11.5, the alkaline cleaning agent dosing pump is automatically turned off to run. The alkaline cleaning agent dosing pump 61 is interlocked with the cleaning pH meter 58 to control the pH value in the cleaning tank 71 during the alkaline chemical cleaning process.

[0224] ⑦. Open the first stage cleaning water inlet valve 56, the first stage water production cleaning valve 51, the first stage concentrated water regulating valve 21 100%, the first stage second stage water inlet valve 23, the first stage second stage water production cleaning valve 53, the first stage second stage concentrated water regulating valve 31 100%, and the first stage second stage concentrated water cleaning valve 52 in sequence. The valve action interval is 3 seconds. (If it is detected that the above valves are not open, the execution program will be terminated and an alarm will be displayed);

[0225] ⑧. After confirming that all valves are fully opened, start the cleaning pump 57 with a delay of 10* seconds, start the first-stage high-pressure pump 13 (frequency conversion*35Hz) with a delay of 10* seconds, start the first-stage circulation pump 16 with a delay of 10* seconds, and start the first-stage second-stage circulation pump 26 with a delay of 10* seconds;

[0226] ⑨. The system automatically enters the alkaline chemical cleaning program of the first-level system. When the chemical cleaning time of the first-level system reaches the set time, the alkaline chemical cleaning shutdown program of the first-level system is triggered. The first-level second-stage circulation pump 26 is automatically closed with a delay of 10* seconds, the first-level first-stage circulation pump 16 is closed with a delay of 10* seconds, the first-level high-pressure pump 13 (frequency conversion*35Hz) is closed with a delay of 30* seconds, and the cleaning pump 57 is closed with a delay of 10* seconds. After confirming that all pumps are closed, the first-level first-stage cleaning water inlet valve 56, the first-level first-stage water production cleaning valve 51, the first-level first-stage concentrated water regulating valve 21, the first-level second-stage water inlet valve 23, the first-level second-stage water production cleaning valve 53, the first-level second-stage concentrated water regulating valve 31, and the first-level second-stage concentrated water cleaning valve 52 are closed with a delay of 10* seconds, and the cleaning drain valve 60 is opened (when the liquid level of the cleaning tank 71 is ≤0m, the cleaning drain valve 60 is automatically closed). After confirming that all equipment is closed or opened in place, the system automatically triggers the flushing program with a delay of 5* seconds. After manual selection and confirmation, it enters the flushing mode;

[0227] ⑩. When the liquid level of the alkaline cleaning agent storage tank 63 is lower than the set value, the alkaline chemical cleaning program of the first-level system cannot be started to ensure the alkaline chemical cleaning effect. At the same time, an alarm signal automatically pops up to prompt manual dosing. Before the low liquid level alarm of the alkaline cleaning agent storage tank 63 is eliminated, the first-level system cannot enter the operation mode or chemical cleaning mode;

[0228] Among them, the alkaline chemical cleaning procedure of the first stage system is as follows:

[0229] ①. Manually select and determine the alkaline chemical cleaning program of the first-stage system and enter the alkaline chemical cleaning program of the first-stage system;

[0230] ②. When the pressure difference between the first-stage membrane inlet pressure sensor 15 and the first-stage membrane outlet pressure sensor 19 is greater than the set value for a duration of ≥24 hours (which can be flexibly set according to the actual operating conditions), the first-stage system automatically enters the shutdown program. After the system automatically shuts down, the chemical cleaning mode operation conditions are automatically triggered, and a dialog box pops up to prompt manual judgment to select any one of the eight chemical cleaning programs: the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage two-stage system acidic chemical cleaning or alkaline chemical cleaning program mode, and the second-stage system acidic chemical cleaning or alkaline chemical cleaning program. After manually selecting and confirming the first-stage one-stage system alkaline chemical cleaning program, enter the first-stage one-stage system alkaline chemical cleaning program;

[0231] ③. When the first-stage water flow meter 22 shows that the water flow duration is ≥24 hours (which can be flexibly set according to the actual operation situation) and is lower than the set water flow, the system automatically enters the shutdown program. After the system automatically shuts down, the chemical cleaning mode operation conditions are automatically triggered, and a dialog box pops up to prompt manual judgment to select any one of the eight chemical cleaning programs: the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage second-stage system acidic chemical cleaning or alkaline chemical cleaning program mode, and the second-stage system acidic chemical cleaning or alkaline chemical cleaning program. After manually selecting and confirming the first-stage first-stage system alkaline chemical cleaning program, the first-stage first-stage system alkaline chemical cleaning program is entered;

[0232] ④. When any of the conditions for automatically triggering the chemical cleaning mode appears, a dialog box pops up to prompt manual judgment to select any one of the eight chemical cleaning programs, including the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage two-stage system acidic chemical cleaning or alkaline chemical cleaning program mode, and the second-stage system acidic chemical cleaning or alkaline chemical cleaning program. After manually selecting and confirming the first-stage one-stage system alkaline chemical cleaning program, enter the first-stage one-stage system alkaline chemical cleaning program;

[0233] ⑤. Open the water supply valve, set the liquid level through the liquid level gauge of the cleaning tank 71 to control the opening and closing of the cleaning water supply valve, and automatically close the cleaning water supply valve when the liquid level in the cleaning tank 71 reaches the set liquid level value;

[0234] ⑥. Turn on the cleaning mixer 72 and the alkaline cleaning agent dosing pump 61 in sequence. When the pH value in the cleaning tank 71 is ≤10.5, the alkaline cleaning agent dosing pump 61 is automatically turned on to run. When the pH value in the cleaning tank 71 is ≥11.5, the alkaline cleaning agent dosing pump is automatically turned off to run. The alkaline cleaning agent dosing pump 61 is interlocked with the cleaning pH meter 58 to control the pH value in the cleaning tank 71 during the alkaline chemical cleaning process.

[0235] ⑦. Open the first stage cleaning water inlet valve 56, the first stage water production cleaning valve 51, the first stage concentrated water regulating valve 21 100%, and the first stage concentrated water cleaning valve 85 in sequence. The valve action interval is 3 seconds. (If it is detected that the above valves are not opened, the execution program will be terminated and an alarm will be displayed);

[0236] ⑧. After confirming that all valves are fully opened, delay 10* seconds to start the cleaning pump 57, delay 10* seconds to start the first-stage high-pressure pump 13 (frequency conversion*35Hz), and delay 10* seconds to start the first-stage circulation pump 16;

[0237] ⑨. The system automatically enters the alkaline chemical cleaning program of the first stage and the first stage system. When the chemical cleaning time of the first stage and the first stage system reaches the set time, the alkaline chemical cleaning shutdown program of the first stage and the first stage system is triggered, and the first stage and the first stage circulation pump 16 is automatically closed with a delay of 10* seconds, the first stage high pressure pump 13 (frequency conversion*35Hz) is automatically closed with a delay of 30* seconds, and the cleaning pump 57 is automatically closed with a delay of 10* seconds. After confirming that all pumps are closed, the first stage and the first stage cleaning water inlet valve 56, the first stage and the first stage water production cleaning valve 51, the first stage and the first stage concentrated water regulating valve 21, and the first stage and the first stage concentrated water cleaning valve 85 are closed with a delay of 10* seconds, and the cleaning drain valve 60 is opened (when the liquid level of the cleaning tank 71 is ≤0m, the cleaning drain valve 60 is automatically closed). After confirming that all equipment is closed or opened in place, the system automatically triggers the flushing program with a delay of 5* seconds, and enters the flushing mode after manual selection and confirmation;

[0238] ⑩. When the liquid level of the alkaline cleaning agent storage tank 63 is lower than the set value, the alkaline chemical cleaning program of the first-level system cannot be started to ensure the alkaline chemical cleaning effect. At the same time, an alarm signal automatically pops up to prompt manual dosing. Before the low liquid level alarm of the alkaline cleaning agent storage tank 63 is eliminated, the first-level system cannot enter the operation mode or chemical cleaning mode;

[0239] Among them, the alkaline chemical cleaning procedure of the first-stage and second-stage systems is as follows:

[0240] ①. Manually select and determine the alkaline chemical cleaning program of the first-stage and second-stage systems, and enter the alkaline chemical cleaning program of the first-stage and second-stage systems;

[0241] ②. When the pressure difference between the first-stage and second-stage membrane inlet pressure sensor 25 and the first-stage and second-stage membrane outlet pressure sensor 28 is greater than the set value for a duration of ≥24 hours (which can be flexibly set according to the actual operating conditions), the first-stage system automatically enters the shutdown program. After the system automatically shuts down, the chemical cleaning mode operation conditions are automatically triggered, and a dialog box pops up to prompt manual judgment to select any one of the eight chemical cleaning programs: the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage and first-stage system acidic chemical cleaning or alkaline chemical cleaning program mode, and the second-stage system acidic chemical cleaning or alkaline chemical cleaning program. After manually selecting and determining the first-stage and second-stage system alkaline chemical cleaning program, enter the first-stage and second-stage system alkaline chemical cleaning program;

[0242] ③. When the first-stage and second-stage water flow meter 20 shows that the water flow duration is ≥24 hours (which can be flexibly set according to the actual operation situation) and is lower than the set water flow, the system automatically enters the shutdown program. After the system automatically shuts down, the chemical cleaning mode operation conditions are automatically triggered, and a dialog box pops up to prompt manual judgment to select any one of the eight chemical cleaning programs, namely, the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage and first-stage system acidic chemical cleaning or alkaline chemical cleaning program mode, and the second-stage system acidic chemical cleaning or alkaline chemical cleaning program. After manually selecting and confirming the first-stage and second-stage system alkaline chemical cleaning program, the first-stage and second-stage system alkaline chemical cleaning program is entered;

[0243] ④. When any of the conditions for automatically triggering the chemical cleaning mode appears, a dialog box pops up to prompt manual judgment to select any one of the eight chemical cleaning programs, including the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage two-stage system acidic chemical cleaning or alkaline chemical cleaning program mode, and the second-stage system acidic chemical cleaning or alkaline chemical cleaning program. After manually selecting and confirming the first-stage two-stage system alkaline chemical cleaning program, enter the first-stage two-stage system alkaline chemical cleaning program;

[0244] ⑤. Open the water supply valve, set the liquid level through the liquid level gauge of the cleaning tank 71 to control the opening and closing of the cleaning water supply valve, and automatically close the cleaning water supply valve when the liquid level in the cleaning tank 71 reaches the set liquid level value;

[0245] ⑥. Turn on the cleaning mixer 72 and the alkaline cleaning agent dosing pump 61 in sequence. When the pH value in the cleaning tank 71 is ≤10.5, the alkaline cleaning agent dosing pump 61 is automatically turned on to run. When the pH value in the cleaning tank 71 is ≥11.5, the alkaline cleaning agent dosing pump is automatically turned off to run. The alkaline cleaning agent dosing pump 61 is interlocked with the cleaning pH meter 58 to control the pH value in the cleaning tank 71 during the alkaline chemical cleaning process.

[0246] ⑦. Open the first-stage second-stage cleaning water inlet valve 55, the first-stage second-stage water production cleaning valve 53, the first-stage second-stage concentrated water regulating valve 31 100%, and the first-stage second-stage concentrated water cleaning valve 52 in sequence. The valve action interval is 3 seconds. (If it is detected that the above valves are not open, the execution program will be terminated and an alarm will be displayed);

[0247] ⑧. After confirming that all valves are fully opened, start the cleaning pump 57 with a delay of 10* seconds, and start the first-stage second-stage circulation pump 26 with a delay of 10* seconds;

[0248] ⑨. The system automatically enters the alkaline chemical cleaning program of the first-stage and second-stage system. When the chemical cleaning time of the first-stage and second-stage system reaches the set time, the alkaline chemical cleaning shutdown program of the first-stage and second-stage system is triggered, and the first-stage and second-stage circulation pump 26 is automatically closed for 10* seconds, and the cleaning pump 57 is automatically closed for 10* seconds. After confirming that all pumps are closed, the first-stage and second-stage cleaning water inlet valve 55, the first-stage and second-stage water production cleaning valve 53, the first-stage and second-stage concentrated water regulating valve 31, and the first-stage and second-stage concentrated water cleaning valve 52 are closed for 10* seconds, and the cleaning drain valve 60 is opened (when the liquid level of the cleaning tank 71 is ≤0m, the cleaning drain valve 60 is automatically closed). After confirming that all equipment is closed or opened in place, the system automatically triggers the flushing program with a delay of 5* seconds. After manual selection and confirmation, it enters the flushing mode;

[0249] ⑩. When the liquid level of the alkaline cleaning agent storage tank 63 is lower than the set value, the alkaline chemical cleaning program of the first-level system cannot be started to ensure the alkaline chemical cleaning effect. At the same time, an alarm signal automatically pops up to prompt manual dosing. Before the low liquid level alarm of the alkaline cleaning agent storage tank 63 is eliminated, the first-level system cannot enter the operation mode or chemical cleaning mode;

[0250] Among them, the alkaline chemical cleaning procedure of the secondary system is as follows:

[0251] ①. Manually select and determine the alkaline chemical cleaning program of the secondary system and enter the alkaline chemical cleaning program of the secondary system;

[0252] ②. When the pressure difference between the secondary membrane inlet pressure sensor 42 and the secondary membrane outlet pressure sensor 35 is greater than the set value for a duration of ≥24 hours (which can be flexibly set according to the actual operating conditions), the secondary system automatically enters the shutdown program. After the system automatically shuts down, the chemical cleaning mode operation conditions are automatically triggered, and a dialog box pops up to prompt manual judgment to select any one of the eight chemical cleaning programs: the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage two-stage system acidic chemical cleaning or alkaline chemical cleaning program mode, and the second-stage system acidic chemical cleaning or alkaline chemical cleaning program. After manually selecting and confirming the alkaline chemical cleaning program for the secondary system, the secondary system alkaline chemical cleaning program is entered;

[0253] ③. When the secondary water flow meter 43 shows that the water flow duration is ≥24 hours (which can be flexibly set according to the actual operation situation) and is lower than the set water flow, the system automatically enters the shutdown program. After the system automatically shuts down, the chemical cleaning mode operation conditions are automatically triggered, and a dialog box pops up to prompt manual judgment to select any one of the eight chemical cleaning programs: the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage two-stage system acidic chemical cleaning or alkaline chemical cleaning program mode, and the second-stage system acidic chemical cleaning or alkaline chemical cleaning program. After manually selecting and confirming the second-stage system alkaline chemical cleaning program, enter the second-stage system alkaline chemical cleaning program;

[0254] ④. When any of the conditions for automatically triggering the chemical cleaning mode appears, a dialog box pops up to prompt manual judgment to select any one of the eight chemical cleaning programs: the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage system acidic chemical cleaning or alkaline chemical cleaning program, the first-stage two-stage system acidic chemical cleaning or alkaline chemical cleaning program mode, and the second-stage system acidic chemical cleaning or alkaline chemical cleaning program. After manually selecting and confirming the second-stage system alkaline chemical cleaning program, enter the second-stage system alkaline chemical cleaning program;

[0255] ⑤. Open the water supply valve, set the liquid level through the liquid level gauge of the cleaning tank 71 to control the opening and closing of the cleaning water supply valve, and automatically close the cleaning water supply valve when the liquid level in the cleaning tank 71 reaches the set liquid level value;

[0256] ⑥. Turn on the cleaning mixer 72 and the alkaline cleaning agent dosing pump 61 in sequence. When the pH value in the cleaning tank 71 is ≤10.5, the alkaline cleaning agent dosing pump 61 is automatically turned on to run. When the pH value in the cleaning tank 71 is ≥11.5, the alkaline cleaning agent dosing pump is automatically turned off to run. The alkaline cleaning agent dosing pump 61 is interlocked with the cleaning pH meter 58 to control the pH value in the cleaning tank 71 during the alkaline chemical cleaning process.

[0257] ⑦. Open the secondary cleaning water inlet valve 54, the secondary water production cleaning valve 49, the secondary concentrated water regulating valve 37 100%, and the secondary concentrated water cleaning valve 50 in sequence. The valve action interval is 3 seconds. (If it is detected that the above valves are not open, the execution program will be terminated and an alarm will be displayed);

[0258] ⑧. After confirming that all valves are fully opened, delay 10* seconds to start the cleaning pump 57, delay 30* seconds to start the secondary high-pressure pump 46 (frequency conversion*35Hz), and delay 10* seconds to start the secondary circulation pump 36;

[0259] ⑨. The system automatically enters the secondary system alkaline chemical cleaning program. When the secondary system chemical cleaning time reaches the set time, the secondary system alkaline chemical cleaning shutdown program is triggered, and the secondary circulation pump 36 is automatically closed with a delay of 10* seconds, the secondary high-pressure pump 46 (frequency conversion*35Hz) is closed with a delay of 30* seconds, and the cleaning pump 57 is closed with a delay of 10* seconds. After confirming that all pumps are closed, the secondary cleaning water inlet valve 54, the secondary water production cleaning valve 49, the secondary concentrated water regulating valve 37, and the secondary concentrated water cleaning valve 50 are closed with a delay of 10* seconds, and the cleaning drain valve 60 is opened (when the liquid level of the cleaning tank 71 is ≤0m, the cleaning drain valve 60 is automatically closed). After confirming that all equipment is closed or opened in place, the system automatically triggers the flushing program with a delay of 5* seconds. After manual selection and confirmation, it enters the flushing mode;

[0260] ⑩. When the liquid level of the alkaline cleaning agent storage tank 63 is lower than the set value, the alkaline chemical cleaning program of the first-level system cannot be started to ensure the alkaline chemical cleaning effect. At the same time, an alarm signal automatically pops up to prompt manual dosing. Before the low liquid level alarm of the alkaline cleaning agent storage tank 63 is eliminated, the first-level system cannot enter the operation mode or chemical cleaning mode;

[0261] Among them, the start-up time interval and chemical cleaning time of the chemical cleaning mode are flexibly set according to the actual operation of the reverse osmosis membrane system. The types and models of acid and alkaline cleaning agents are manually adjusted and determined according to the actual chemical cleaning effect and water quality. Acidic chemical cleaning and alkaline chemical cleaning are carried out alternately to ensure the chemical cleaning effect and maintain the normal operation of the membrane reduction system.

[0262] In summary, the present invention provides an automatically cleaning landfill leachate nanofiltration concentrate reduction system, which automatically and intelligently controls the operation, chemical cleaning time, chemical cleaning cycle and other operation control parameters of the nanofiltration concentrate reduction system through real-time collection and analysis of the operation data of the nanofiltration concentrate reduction system, and timely cleans the two-stage material separation membrane treatment system, effectively restores the flux of the two-stage material separation membrane, extends the service life of the two-stage material separation membrane system, and effectively avoids manual operation errors and possible irreversible damage to the two-stage material separation membrane components.

[0263] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An automatic cleaning landfill leachate nanofiltration concentrate reduction system, characterized in that: include: A control component, a concentration and reduction component, a cleaning component and a collection component; the control end of the control component is respectively connected to the control end of the concentration and reduction component, the control end of the cleaning component and the control end of the collection component; the cleaning component is connected to the concentration and reduction component through a pipeline; the collection component is used to collect real-time operation data of the concentration and reduction component and send the real-time operation data to the control component; The control component is used to compare the real-time operation data with a preset operation data threshold, and determine whether the concentrate reduction system needs to be cleaned according to the comparison result. When it is determined that the concentrate reduction system needs to be cleaned, any of the following steps is performed: A. Sending a cleaning prompt message to the user, prompting the user to select whether to clean, receiving and starting the cleaning component to clean the concentrate reduction system according to the cleaning instruction sent by the user; B. When the concentration reduction component stops working, the cleaning component is turned on to clean the concentrate reduction system; The concentration and reduction component includes: a nanofiltration concentrated water tank, a primary nanofiltration system and a secondary nanofiltration system; The primary nanofiltration system comprises: a primary water inlet pump, a primary water inlet valve, a primary filter, a primary high-pressure pump, a primary first-stage circulation pump, a primary first-stage membrane assembly, a primary first-stage produced water discharge valve, a primary produced water tank, a primary first-stage concentrated water regulating valve, a primary second-stage water inlet valve, a primary second-stage circulation pump, and a primary second-stage membrane assembly; the liquid outlet pipe of the nanofiltration concentrated water tank is connected to the liquid inlet pipe of the primary water inlet pump, the liquid outlet pipe of the primary water inlet pump is connected to the first end of the primary water inlet valve, and the second end of the primary water inlet valve is connected to the liquid inlet pipe of the primary filter; the liquid outlet pipe of the primary filter is connected to the liquid inlet pipe of the primary high-pressure pump, the liquid outlet pipe of the primary high-pressure pump is connected to the liquid inlet pipe of the primary first-stage circulation pump, and the liquid outlet pipe of the primary first-stage circulation pump is connected to the liquid inlet pipe of the primary first-stage membrane assembly; The water production pipe of the first-stage membrane assembly is connected to the liquid inlet pipe of the first-stage water production tank through the first-stage water production discharge valve; the concentrate water pipe of the first-stage membrane assembly is also connected to the liquid inlet pipe of the first-stage circulation pump, the concentrate water pipe of the first-stage membrane assembly is connected to the first end of the first-stage concentrate water regulating valve, and the second end of the first-stage concentrate water regulating valve is connected to the first end pipeline of the first-stage second-stage water inlet valve; the second end of the first-stage second-stage water inlet valve is connected to the liquid inlet pipe of the first-stage second-stage circulation pump, the liquid outlet pipe of the first-stage second-stage circulation pump is connected to the liquid inlet pipe of the first-stage second-stage membrane assembly, the water production pipe of the first-stage second-stage membrane assembly is also connected to the circulation liquid inlet pipe of the nanofiltration concentrate water tank through the first-stage second-stage water production discharge valve, and the concentrate water pipe of the first-stage second-stage membrane assembly is also connected to the first end of the first-stage second-stage concentrate water regulating valve; The secondary nanofiltration system includes: a secondary water inlet pump, a secondary water inlet valve, a secondary filter, a secondary high-pressure pump, a secondary circulation pump, a secondary membrane assembly, and a secondary concentrated water regulating valve; the liquid inlet pipe of the secondary water inlet pump is connected to the liquid outlet pipe of the primary water production tank, the liquid outlet pipe of the secondary water inlet pump is connected to the first end of the secondary water inlet valve, the second end of the secondary water inlet valve is connected to the liquid inlet pipe of the secondary filter, the liquid outlet pipe of the secondary filter is connected to the liquid inlet pipe of the secondary high-pressure pump, the liquid outlet pipe of the secondary high-pressure pump is connected to the liquid inlet pipe of the secondary circulation pump, the liquid outlet pipe of the secondary circulation pump is connected to the liquid inlet pipe of the secondary membrane, and the concentrated water pipe of the secondary membrane is respectively connected to the liquid inlet pipe of the secondary circulation pump and the first end of the secondary concentrated water regulating valve; the water production pipe of the secondary membrane is connected to the first end of the secondary water production discharge valve.

2. The automatic cleaning landfill leachate nanofiltration concentrate reduction system according to claim 1, characterized in that: The cleaning component includes: an acidic chemical cleaning agent storage tank, an alkaline chemical cleaning agent storage tank, an acidic dosing pump, an alkaline dosing pump, a cleaning pump, a water replenishment valve, a cleaning drain valve, a circulating liquid inlet pipe, multiple cleaning water inlet valves, multiple water production cleaning valves and multiple concentrated water cleaning valves; the multiple cleaning water inlet valves, multiple water production cleaning valves and multiple concentrated water cleaning valves all correspond to multiple nanofiltration systems one by one, the acidic chemical cleaning agent storage tank is connected to the cleaning tank through the acidic dosing pump; the alkaline chemical cleaning agent storage tank is connected to the cleaning tank through the alkaline dosing pump; the cleaning tank is connected to an external tap water pipeline through a water replenishment valve, the liquid outlet pipe of the cleaning tank is connected to the liquid inlet pipe of the cleaning pump, the cleaning pump is respectively connected to the first ends of the multiple cleaning water inlet valves, and the second end of each cleaning water inlet valve is connected to the high-pressure pump inlet pipe or filter inlet pipe of the corresponding nanofiltration system The control ends of the acid dosing pump, alkaline dosing pump, cleaning pump, water replenishment valve, cleaning drain valve, multiple cleaning water inlet valves, multiple water production cleaning valves and multiple concentrated water cleaning valves are all connected to the control end of the control component; a cleaning liquid level meter, a cleaning mixer and a cleaning pH meter are also provided in the cleaning tank, and the control ends of the cleaning liquid level meter, the cleaning mixer and the cleaning pH meter are all connected to the control end of the control component, and the cleaning liquid level meter is used to measure the liquid level height of the cleaning tank and send the measured liquid level height to the control component; The control assembly includes a cleaning liquid preparation control module, the control end of which is respectively connected to the control ends of the cleaning liquid level meter, the cleaning mixer, the cleaning pH meter, the water replenishment valve, the acid dosing pump, and the alkaline dosing pump. The cleaning liquid preparation control module has a plurality of cleaning liquid preparation modes, including: a clean water preparation mode, an acid cleaning liquid preparation mode, and an alkaline cleaning liquid preparation mode; When the cleaning liquid preparation module is in the clean water preparation mode, the cleaning liquid preparation module is used to: Open the water supply valve and detect the liquid level in the cleaning tank by using the cleaning tank liquid level gauge. When the liquid level in the cleaning tank reaches a set value, close the water supply valve; When the cleaning solution preparation module is in the acidic cleaning solution preparation mode, the cleaning solution preparation module is used to: Open the water supply valve and detect the liquid level in the cleaning tank by using the cleaning tank liquid level gauge. When the liquid level in the cleaning tank reaches a set value, close the water supply valve; Turn on the cleaning mixer and the acid cleaning agent dosing pump in sequence, and detect the pH value of the cleaning tank by using the cleaning tank pH meter. When the pH value in the cleaning tank is ≤ the lower limit of the acid cleaning pH value interval, turn off the acid cleaning agent dosing pump. When the pH value in the cleaning tank is ≥ the upper limit of the acid cleaning pH value interval, turn on the acid cleaning agent dosing pump, and the acid cleaning agent dosing pump is interlocked with the cleaning pH meter for control; When the cleaning solution preparation module is in the alkaline cleaning solution preparation mode, the cleaning solution preparation module is used to: Open the water supply valve and detect the liquid level in the cleaning tank by using the cleaning tank liquid level gauge. When the liquid level in the cleaning tank reaches a set value, close the water supply valve; Turn on the cleaning mixer and alkaline cleaning agent dosing pump in sequence, and detect the pH value of the cleaning tank by the cleaning tank pH meter. When the pH value in the cleaning tank is ≥ the lower limit of the alkaline cleaning pH value range, turn off the alkaline cleaning agent dosing pump. When the pH value in the cleaning tank is ≤ the upper limit of the alkaline cleaning pH value range, turn on the alkaline cleaning agent dosing pump. The alkaline cleaning agent dosing pump is interlocked with the cleaning pH meter for control.

3. The automatic cleaning landfill leachate nanofiltration concentrate reduction system according to claim 2, characterized in that: The cleaning water inlet valve includes: a first-stage cleaning water inlet valve, a first-stage second-stage cleaning water inlet valve, and a second-stage cleaning water inlet valve; the produced water cleaning valve includes: a first-stage produced water cleaning valve, a first-stage second-stage produced water cleaning valve, and a second-stage produced water cleaning valve; the concentrated water cleaning valve includes a first-stage concentrated water cleaning valve, a first-stage second-stage concentrated water cleaning valve, and a second-stage concentrated water cleaning valve; The cleaning pump is connected to the liquid inlet pipe of the first-stage filter through the first-stage cleaning water inlet valve; the water production pipe of the first-stage membrane assembly is also connected to the circulating liquid inlet pipe of the cleaning tank through the first-stage water production cleaning valve; the second end of the first-stage concentrated water regulating valve is also connected to the circulating liquid inlet pipe of the cleaning tank through the first-stage concentrated water cleaning valve; The cleaning pump is connected to the first-stage second-stage water inlet valve through the first-stage second-stage cleaning water inlet valve, and the water production pipe of the first-stage second-stage membrane assembly is also connected to the circulating liquid inlet pipe of the cleaning tank through the first-stage second-stage water production cleaning valve; the second end of the first-stage second-stage concentrated water regulating valve is also connected to the circulating liquid inlet pipe of the cleaning tank through the first-stage second-stage concentrated water cleaning valve; The cleaning pump is connected to the liquid inlet pipe of the secondary filter through a secondary cleaning water inlet valve; the water production pipe of the secondary membrane assembly is also connected to the circulating liquid inlet pipe of the cleaning tank through a secondary water production cleaning valve; the second end of the secondary concentrated water regulating valve is also connected to the circulating liquid inlet pipe of the cleaning tank through a secondary concentrated water cleaning valve.

4. The automatic cleaning landfill leachate nanofiltration concentrate reduction system according to claim 3 is characterized in that: The control component includes a cleaning process control module, which is used to control the cleaning component to conduct the cleaning channel of the system or equipment to be cleaned after the cleaning component prepares the cleaning liquid, so that the prepared cleaning liquid enters the cleaning system or equipment for cleaning, and controls the cleaning process of the system or equipment to be cleaned. The cleaning process control module has multiple system cleaning modes, including: a primary system cleaning mode, a primary first-order system cleaning mode, a primary second-order system cleaning mode, and a secondary system cleaning mode; When the cleaning process control module is in the primary system cleaning mode, it is used to: Open the first stage cleaning water inlet valve, the first stage water production cleaning valve, the first stage concentrated water regulating valve 100% in sequence, the first stage second stage water inlet valve, the first stage second stage water production cleaning valve, the first stage second stage concentrated water regulating valve 100% open, and the first stage second stage concentrated water discharge valve; After confirming that all valves are fully opened, delay starting the cleaning pump, delay starting the first-stage high-pressure pump, delay starting the first-stage first-stage circulation pump, and delay starting the first-stage second-stage circulation pump; Delay opening of the first-stage and second-stage concentrated water cleaning valves, and after confirming that the valves are fully opened, delay closing of the first-stage and second-stage concentrated water discharge valves; The system automatically enters the first-stage system flushing mode. When the first-stage system flushing time reaches the set time or the pH value displayed by the cleaning pH meter in the cleaning box, the first-stage system flushing mode shutdown program is triggered, and the first-stage two-stage circulation pump, the first-stage one-stage circulation pump, the first-stage high-pressure pump, and the cleaning pump are delayed in sequence. After confirming that all pumps are shut down, the first-stage one-stage cleaning water inlet valve, the first-stage one-stage water production cleaning valve, the first-stage one-stage concentrated water regulating valve, the first-stage two-stage water inlet valve, the first-stage two-stage water production cleaning valve, the first-stage two-stage concentrated water regulating valve, and the first-stage two-stage concentrated water cleaning valve are delayed to close. The first-stage one-stage water production discharge valve, the first-stage two-stage water production discharge valve, the first-stage two-stage concentrated liquid discharge valve, and the cleaning drain valve are opened; When the cleaning process control module is in the first-stage first-order system cleaning mode, it is used to: Open the first stage cleaning water inlet valve, first stage water production cleaning valve, first stage concentrated water regulating valve 100% and first stage concentrated water cleaning valve in sequence; After confirming that all valves are fully opened, delay the start of the cleaning pump, delay the start of the first-stage high-pressure pump, and delay the start of the first-stage circulation pump; The system automatically enters the flushing mode of the first stage system. When the flushing time of the first stage system reaches the set time or the set pH value, the shutdown program of the first stage system flushing mode is triggered, and the first stage circulation pump, the first stage high pressure pump, and the cleaning pump are delayed to be closed in sequence. After confirming that all pumps are shut down, the first stage cleaning water inlet valve, the first stage water production cleaning valve, the first stage concentrated water regulating valve, and the first stage concentrated water cleaning valve are delayed to be closed, and the first stage water production discharge valve and the cleaning drain valve are opened; When the cleaning process control module is in the first-stage second-stage system cleaning mode, it is used to: Open the first-stage second-stage cleaning water inlet valve, the first-stage second-stage water production cleaning valve, the first-stage second-stage concentrated water regulating valve 100%, and the first-stage second-stage concentrated water discharge valve in sequence; After confirming that all valves are fully opened, delay the start of the cleaning pump and the first-stage and second-stage circulation pumps; Delay opening of the first-stage and second-stage concentrated water cleaning valves, and after confirming that the valves are fully opened, delay closing of the first-stage and second-stage concentrated water discharge valves; The system automatically enters the first-stage two-stage system flushing mode. When the first-stage two-stage system flushing time reaches the set time or the set pH value, the first-stage two-stage system flushing mode shutdown program is triggered, and the first-stage two-stage circulation pump and the cleaning pump are automatically closed in sequence. After confirming that all pumps are closed, the first-stage two-stage cleaning water inlet valve, the first-stage two-stage water production cleaning valve, the first-stage two-stage concentrated water regulating valve, and the first-stage two-stage concentrated water cleaning valve are closed with delay, and the first-stage two-stage water production discharge valve and the cleaning drain valve are opened; When the cleaning process control module is in the secondary system cleaning mode, it is used to: Open the secondary cleaning water inlet valve, secondary water production cleaning valve, secondary concentrated water regulating valve 100% and secondary concentrated water discharge valve in sequence; After confirming that all valves are fully opened, delay starting the cleaning pump, delay starting the secondary high-pressure pump, and delay starting the secondary circulation pump; Delay opening of the secondary concentrated water cleaning valve, and after confirming that the valve is fully opened, delay closing of the secondary concentrated water discharge valve; The system automatically enters the secondary system flushing mode. When the secondary system flushing time reaches the set time or the set pH value, the secondary system flushing mode shutdown program is triggered, and the secondary circulation pump, secondary high-pressure pump, and cleaning pump are automatically and sequentially delayed shut down. After confirming that all pumps are shut down, the secondary cleaning water inlet valve, secondary water production cleaning valve, secondary concentrated water regulating valve, and secondary concentrated water cleaning valve are delayed shut down, and the secondary water production discharge valve and cleaning drain valve are opened.

5. The automatic cleaning landfill leachate nanofiltration concentrate reduction system according to claim 4, characterized in that: When it is determined that the concentration and reduction component needs to be cleaned, the control component also sends the system cleaning mode and cleaning liquid preparation mode options to the user; and receives the selected system cleaning mode and cleaning liquid preparation mode sent by the user, and adjusts the cleaning liquid preparation mode of the cleaning liquid preparation control module to the selected cleaning liquid preparation mode to prepare the selected cleaning liquid; and adjusts the system cleaning mode of the cleaning object control module to the selected system cleaning mode to use the prepared and selected cleaning liquid to clean the selected system.

6. The automatic cleaning landfill leachate nanofiltration concentrate reduction system according to claim 5, characterized in that: The collection assembly includes: a membrane inlet pressure sensor arranged on the liquid inlet pipe of each membrane assembly of the concentration and reduction assembly, a membrane outlet pressure sensor arranged on the concentrated water pipe of each membrane assembly of the concentration and reduction assembly; a water production flow meter arranged on the water production pipe of each membrane assembly of the concentration and reduction assembly, and a water production conductivity meter arranged on the water production pipe of the secondary membrane assembly; The real-time operation data includes: the membrane inlet pressure value collected by the membrane inlet pressure sensor and the membrane outlet pressure collected by the membrane outlet pressure sensor, the membrane assembly water production flow rate collected by the water production flowmeter, the membrane assembly water production conductivity collected by the water production conductivity meter, and the automatic operation time of the concentration and reduction assembly; The cleaning includes chemical cleaning and water flushing; the control component is used for: The front-to-back pressure difference of each membrane component is calculated according to the membrane inlet pressure and the membrane outlet pressure of each membrane component, and the front-to-back pressure difference of each membrane component is compared with its preset pressure threshold. When the front-to-back pressure difference of any membrane component exceeds the pressure threshold, it is determined that the concentration and reduction component needs chemical cleaning; Compare the water production flow rate value of each membrane component with its preset flow rate threshold value, and when the water production flow rate value of any membrane component is lower than the preset flow rate for a duration exceeding the preset time threshold value, it is determined that the concentration and reduction component needs chemical cleaning; Comparing the water conductance value of the secondary membrane assembly with a preset conductance threshold, and when the duration of the water conductance value being higher than the preset conductance threshold exceeds a calibrated conductance time threshold, determining that the concentration and reduction assembly needs chemical cleaning; Monitoring the automatic operation time of the concentration and reduction component, and comparing the automatic operation time of the nanofiltration concentrate reduction system with a preset chemical cleaning time threshold, when the continuous operation time of the nanofiltration concentrate reduction system in the automatic operation state exceeds the preset chemical cleaning time threshold, determining that the concentration and reduction component needs chemical cleaning; The automatic operation time of the concentration and reduction component is compared with the preset flushing time threshold. When the automatic operation time of the concentration and reduction component exceeds the preset flushing time threshold and the concentration and reduction component is shut down, the clean water flushing mode is triggered.

7. The automatic cleaning landfill leachate nanofiltration concentrate reduction system according to claim 6, characterized in that: The system cleaning mode has the following chemical cleaning modes: A primary system acid chemical cleaning mode, wherein the primary system acid chemical cleaning mode is specifically: the cleaning liquid preparation control module executes the acid cleaning liquid preparation mode, and the cleaning object control module executes the primary system cleaning mode; A primary system alkaline chemical cleaning mode, wherein the primary system alkaline chemical cleaning mode is specifically: the cleaning liquid preparation control module executes the alkaline cleaning liquid preparation mode, and the cleaning object control module executes the primary system cleaning mode; A first-stage, first-order system acidic chemical cleaning mode, wherein the first-stage, first-order system acidic chemical cleaning mode is specifically: the cleaning liquid preparation control module executes the acidic cleaning liquid preparation mode, and the cleaning object control module executes the first-stage, first-order system cleaning mode; A first-stage, first-order system alkaline chemical cleaning mode, wherein the first-stage, first-order system alkaline chemical cleaning mode is specifically: the cleaning liquid preparation control module executes the alkaline cleaning liquid preparation mode, and the cleaning object control module executes the first-stage, first-order system cleaning mode; A first-stage two-stage system acidic chemical cleaning mode, wherein the first-stage two-stage system acidic chemical cleaning mode is specifically: the cleaning liquid preparation control module executes the acidic cleaning liquid preparation mode, and the cleaning object control module executes the first-stage two-stage system cleaning mode; A first-stage two-stage system alkaline chemical cleaning mode, wherein the first-stage two-stage system alkaline chemical cleaning mode is specifically: the cleaning liquid preparation control module executes the alkaline cleaning liquid preparation mode, and the cleaning object control module executes the first-stage two-stage system cleaning mode; A secondary system acid chemical cleaning mode, wherein the secondary system acid chemical cleaning mode is specifically: the cleaning liquid preparation control module executes the acid cleaning liquid preparation mode, and the cleaning object control module executes the secondary system cleaning mode; A primary system alkaline chemical cleaning mode, wherein the primary system alkaline chemical cleaning mode is specifically: the cleaning liquid preparation control module executes the alkaline cleaning liquid preparation mode, and the cleaning object control module executes the primary system cleaning mode; The system cleaning mode has the following clean water flushing modes: A primary system clean water flushing mode, wherein the primary system clean water flushing mode is specifically: the cleaning liquid preparation control module executes the clean water preparation mode, and the cleaning object control module executes the primary system cleaning mode; A first-stage, first-order system clean water flushing mode, wherein the first-stage, first-order system clean water flushing mode is specifically: the cleaning liquid preparation control module executes the clean water preparation mode, and the cleaning object control module executes the first-stage, first-order system cleaning mode; A primary and secondary system clean water flushing mode, wherein the primary and secondary system clean water flushing mode is specifically: the cleaning liquid preparation control module executes the clean water preparation mode, and the cleaning object control module executes the primary system cleaning mode; A secondary system clean water flushing mode, wherein the secondary system clean water flushing mode is specifically: the cleaning liquid preparation control module executes the clean water preparation mode, and the cleaning object control module executes the secondary system cleaning mode; When it is determined that the concentration and reduction component requires chemical cleaning, the control component is used to send its own chemical cleaning mode to the user as an option, accept and execute the chemical cleaning mode selected by the user; after chemical cleaning of any system, the control component is also used to execute the clean water cleaning mode of the corresponding system.

8. The automatic cleaning landfill leachate nanofiltration concentrate reduction system according to claim 7, characterized in that: Also includes: The scale inhibition component and the acid injection component, the scale inhibition component includes a scale inhibition agent storage tank, a primary scale inhibition injection pump, and a secondary scale inhibition injection pump; the liquid outlet pipe of the scale inhibition agent storage tank is respectively connected to the liquid inlet pipe of the primary scale inhibition injection pump and the liquid inlet pipe of the secondary scale inhibition injection pump, the liquid outlet pipe of the primary scale inhibition injection pump is connected to the liquid inlet pipe of the primary high-pressure pump; the liquid outlet pipe of the secondary scale inhibition injection pump is connected to the liquid inlet pipe of the secondary filter, and the control ends of the primary scale inhibition injection pump and the secondary scale inhibition injection pump are connected to the control component The acid dosing assembly comprises: an acid storage tank, a primary acid dosing pump, and a secondary acid dosing pump; the liquid outlet pipe of the acid storage tank is respectively connected to the liquid inlet pipe of the primary acid dosing pump and the liquid inlet pipe of the secondary acid dosing pump, the liquid outlet pipe of the primary acid dosing pump is connected to the liquid inlet pipe of the nanofiltration concentrated water tank; the liquid outlet pipe of the secondary acid dosing pump is connected to the liquid inlet pipe of the primary water production tank; the control ends of the primary acid dosing pump and the secondary acid dosing pump are both connected to the control end of the control assembly; A nanofiltration concentrated water tank level gauge is installed in the nanofiltration concentrated water tank, and a control end of the nanofiltration concentrated water tank level gauge is connected to a control end of the control component; the control component is used to execute the following automatic system cleaning mode according to the user's automatic operation instruction: The control component monitors the real-time liquid level of the nanofiltration concentrated water tank through the nanofiltration concentrated water tank level gauge, and compares the real-time liquid level of the nanofiltration concentrated water tank with the set liquid level for starting the nanofiltration concentrated liquid reduction system. When the liquid level of the nanofiltration concentrated water tank reaches the set liquid level for starting the nanofiltration concentrated liquid reduction system, the nanofiltration concentrated water tank agitator, the first-stage water inlet valve, the first-stage first-stage water production discharge valve, the first-stage first-stage concentrated water regulating valve opened 100%, the first-stage second-stage water inlet valve, the first-stage second-stage water production discharge valve, the first-stage second-stage concentrated water regulating valve opened 100%, and the first-stage second-stage concentrated water discharge valve are opened in sequence; After confirming that all valves are fully opened, delay starting the first-stage water inlet pump, the first-stage anti-scaling pump, the first-stage high-pressure pump, the first-stage first-stage circulation pump, and delay adjusting the opening degree of the first-stage first-stage concentrated water regulating valve to the set pressure range; After confirming that the opening degree of the first-stage concentrated water regulating valve is adjusted to the right position, the first-stage second-stage circulation pump is started with a delay, and the opening degree of the first-stage second-stage concentrated water regulating valve is adjusted to the set pressure or flow range with a delay; When the liquid level in the primary water production tank reaches the set start level, the primary water production tank mixer, secondary water inlet valve, secondary water production discharge valve, secondary concentrated water regulating valve open 100%, and secondary concentrated water discharge valve are automatically opened in sequence; After confirming that the above valves are fully opened, delay the start of the secondary water inlet pump, the secondary antiscalant dosing pump, the secondary high-pressure pump, the secondary circulation pump, and adjust the opening of the secondary concentrated water regulating valve to the set pressure or flow range; The system enters automatic operation state.

9. The automatic cleaning landfill leachate nanofiltration concentrate reduction system according to claim 8, characterized in that: A first water inlet pressure sensor is installed on the liquid inlet pipe of the filter, and a second water inlet pressure sensor is installed on the liquid outlet pipe of the filter, and both the first water inlet pressure sensor and the second water inlet pressure sensor are connected to the control component; The first water inlet pressure sensor is used to collect the liquid pressure value at the filter inlet pipe, and send the liquid pressure value at the filter inlet pipe to the control component; the second water inlet pressure sensor is used to collect the liquid pressure value at the filter outlet pipe, and send the liquid pressure value at the filter outlet pipe to the control component; the control component is used to calculate the filtration pressure difference between the liquid pressure value at the filter inlet pipe and the liquid pressure value at the filter outlet pipe, and determine whether the filtration pressure difference is greater than the upper limit of a preset filtration pressure difference range: When the filtration pressure difference is greater than the upper limit of the preset filtration pressure difference interval, an alarm signal is sent to the user, and the user is prompted to replace the filter element of the filter; When the filtration pressure difference is lower than the lower limit of the filtration pressure difference interval for a duration ≥ a preset time, the nanofiltration system is controlled to enter a shutdown state; A third water inlet pressure sensor is installed on the liquid outlet side pipeline of the high-pressure pump, and the control end of the third water inlet pressure sensor is connected to the control end of the control component. The third water inlet pressure sensor is used to collect the liquid pressure value output by the high-pressure pump, and compare the liquid pressure value output by the high-pressure pump with a preset pressure threshold. When the liquid pressure is higher than the preset pressure threshold, the nanofiltration system is controlled to enter a shutdown state.

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