A membrane system cleaning fluid neutralizing device

Abstract

This utility model discloses a membrane system cleaning solution neutralization device, including a neutralization tank, a circulating pump, an acid dosing tank, an alkali dosing tank, a reducing agent dosing tank, an acid metering pump, an alkali metering pump, a reducing agent metering pump, and a pipeline mixer. The circulating pump is connected to the bottom outlet and the top circulating liquid inlet of the neutralization tank through a circulating pipeline. A drain outlet is provided on the circulating pipeline, connected to a drain pipe with a drain valve. A pipeline mixer is installed on the circulating pipeline. The acid dosing tank is connected to the first inlet of the pipeline mixer through the acid metering pump and the acid inlet pipe. The alkali dosing tank is connected to the second inlet of the pipeline mixer through the alkali metering pump and the alkali inlet pipe. The reducing agent dosing tank is connected to the third inlet of the pipeline mixer through the reducing agent metering pump and the reducing agent inlet pipe. This application can achieve rapid and uniform mixing of the cleaning solution and neutralizing agent in the neutralization tank, shortening the neutralization time and ensuring stable effluent quality and compliance with discharge standards.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a membrane system cleaning solution neutralization device. Background Technology

[0002] Membrane systems become fouled after a period of use, leading to reduced filtration efficiency. Therefore, regular chemical cleaning is necessary. This process generates acidic, alkaline, and oxidizing waste liquids, which, if discharged directly into the environment without treatment, can negatively impact water bodies, soil, and ecosystems. Typically, membrane system cleaning liquids are neutralized by adding alkalis, acids, or reducing agents to neutralize the acidic and alkaline components, thus reducing their direct environmental impact. Existing neutralization devices for membrane system cleaning liquids include a neutralization tank and a chemical dosing system. The dosing system directly adds neutralizing agents to the neutralization tank to react with the cleaning liquid. However, this system suffers from low neutralization efficiency, long neutralization times, uneven reactions, high reagent dosages, and unstable effluent quality due to the large tank volume. Utility Model Content

[0003] To address the aforementioned problems, this invention provides a membrane system cleaning solution neutralization device.

[0004] The technical solution adopted in this utility model is:

[0005] A membrane system cleaning solution neutralization device includes a neutralization tank, a circulating pump, an acid dosing tank, an alkali dosing tank, a reducing agent dosing tank, an acid metering pump, an alkali metering pump, a reducing agent metering pump, and a pipeline mixer. The circulating pump is connected to the bottom outlet and the top circulating liquid inlet of the neutralization tank through a circulating pipeline. A drain outlet is provided on the circulating pipeline, and a drain pipe is connected to the drain outlet. A drain valve is provided on the drain pipe. A pipeline mixer is provided on the circulating pipeline. The acid dosing tank is connected to the first inlet of the pipeline mixer through the acid metering pump and the acid inlet pipe. The alkali dosing tank is connected to the second inlet of the pipeline mixer through the alkali metering pump and the alkali inlet pipe. The reducing agent dosing tank is connected to the third inlet of the pipeline mixer through the reducing agent metering pump and the reducing agent inlet pipe.

[0006] The membrane system cleaning solution enters the neutralization tank and circulates in the neutralization tank and circulation pipeline under the action of the circulation pump. During this process, the neutralizing agent is added to the circulation pipeline through the pipeline mixer and mixes rapidly with the membrane system cleaning solution in the pipeline mixer. Then, under the mechanical power of the circulation pump, the mixture flows to complete the neutralization reaction. The neutralized wastewater that meets the standards is discharged from the neutralization tank through the discharge pipe via the circulation pump.

[0007] Furthermore, the end of the circulation pipeline connected to the neutralization tank is provided with several branch pipelines, which are evenly distributed along the water flow direction in the neutralization tank. By setting up branch pipelines, the circulating liquid can be dispersed into the neutralization tank, increasing the mixing effect of the neutralization tank and improving the neutralization efficiency.

[0008] Furthermore, there are two circulation pumps, arranged in parallel. When the liquid level in the neutralization tank is high, both circulation pumps can be turned on simultaneously to accelerate the mixing of the membrane cleaning solution; when the liquid level in the neutralization tank is low, one circulation pump can be selectively turned on. If one circulation pump malfunctions or is damaged, the other circulation pump can be turned on to ensure the normal operation of the neutralization treatment system.

[0009] Furthermore, a neutralization tank level gauge is installed in the neutralization tank. By installing the level gauge, the water level in the neutralization tank can be monitored. When the water level reaches the lower limit, the neutralization tank inlet valve is opened to prevent the circulation pump from running dry when the water level is low.

[0010] Furthermore, a sampling port is installed on the circulation pipeline, and a sampling tube is connected to the sampling port. The sampling tube is equipped with a sampling valve. The water quality in the neutralization tank is sampled and tested periodically through the sampling valve. When the water quality meets the requirements, the neutralized wastewater is discharged using a circulation pump.

[0011] Furthermore, a pH meter and an ORP meter are installed on the circulation pipeline. The pH value and redox potential of the water in the neutralization tank are monitored in real time using the pH meter and ORP meter. When both phase indicators meet the discharge standards, the neutralized wastewater is discharged.

[0012] Furthermore, the acid dosing tank, alkali dosing tank, and reducing agent dosing tank are respectively equipped with acid level gauges, alkali level gauges, and reducing agent level gauges. The acid level gauges, alkali level gauges, and reducing agent level gauges are used to monitor the liquid levels in the acid dosing tank, alkali dosing tank, and reducing agent dosing tank, respectively. When the liquid level reaches the lower limit, the acid metering pump, alkali metering pump, and reducing agent metering pump are stopped to prevent the pumps from running dry.

[0013] Furthermore, it also includes a PLC controller;

[0014] The acid dosing tank, alkali dosing tank and reducing agent dosing tank are respectively equipped with acid level gauge, alkali level gauge and reducing agent level gauge, and the acid inlet pipe, alkali inlet pipe and reducing agent inlet pipe are respectively equipped with acid inlet automatic valve, alkali inlet automatic valve and reducing agent inlet automatic valve;

[0015] A pH meter and an ORP meter are installed on the circulation pipeline at the outlet side of the pipeline mixer. An inlet is provided at the front end of the neutralization tank, and an inlet pipe is connected to the inlet. A first automatic inlet valve is provided on the inlet pipe. A neutralization tank level gauge is provided in the neutralization tank, and the drain valve is an automatic valve.

[0016] The circulating pump includes a first circulating pump and a second circulating pump. The inlet pipes of the first circulating pump and the second circulating pump are respectively equipped with a second automatic liquid inlet valve and a third automatic liquid inlet valve.

[0017] The first circulation pump, the second circulation pump, the acid metering pump, the alkali metering pump, the reducing agent metering pump, the acid level sensor, the alkali level sensor, the reducing agent level sensor, the neutralization tank level sensor, the pH meter, the ORP meter, the first automatic inlet valve, the automatic drain valve, the second automatic inlet valve, the third automatic inlet valve, the automatic acid inlet valve, the automatic alkali inlet valve, and the automatic reducing agent inlet valve are all connected to the PLC controller.

[0018] By setting up a PLC controller, the neutralization tank can be automatically controlled, the dosage can be precisely controlled, the pH and ORP adjustment efficiency can be improved, and the stability of the effluent quality from the neutralization tank and the compliance with discharge standards (pH 6-9, ORP ≤ 800mv) can be guaranteed.

[0019] The beneficial effects of this utility model are:

[0020] 1. By setting up a circulation pump, circulation pipeline, and pipeline mixer, the neutralizing agent is connected to the circulation pipeline through the pipeline mixer. This allows for rapid mixing of the cleaning solution in the neutralization tank with the neutralizing agent in the circulation pipeline, shortening the neutralization time and improving the neutralization efficiency.

[0021] 2. With the action of the circulating pump and pipeline mixer, the neutralizing agent can be evenly mixed with the cleaning solution, ensuring the stability of the effluent quality, improving the utilization rate of the neutralizing agent, and reducing the consumption of the agent.

[0022] 3. The circulating pump serves to circulate the cleaning solution in the tank and quickly mix it with the chemicals through the pipeline mixer. It also functions as the effluent pump for the neutralization tank, resulting in high pump utilization. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the membrane system cleaning solution neutralization device of this application.

[0024] Figure 2 This is the logic control diagram for the membrane system cleaning solution neutralization device. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solution of this utility model will be clearly and completely described below in conjunction with the accompanying drawings and a preferred embodiment.

[0026] See Figure 1A membrane system cleaning solution neutralization device includes a neutralization tank 1, a liquid level sensor 9 inside the neutralization tank 1, an inlet pipe 13 at the front end of the neutralization tank 1, a first automatic inlet valve 16 on the inlet pipe, and two outlets at the bottom of the neutralization tank 1. The two outlets are respectively connected to a first circulation pump 2 and a second circulation pump 3 through a first outlet pipe and a second automatic inlet valve 4, and a second outlet pipe and a third automatic inlet valve 5. The first circulation pump 2 and the second circulation pump 3 are connected to the circulation pipe 14 via the fourth and third outlet pipes, respectively. The circulation pipe 14 is equipped with a pipe mixer 6, a pH meter 7, and an ORP meter 8. Both the fourth and third outlet pipes are equipped with check valves and pump outlet valves. The other end of the circulation pipe 14 extends above the neutralization tank and splits into two pipelines: a discharge pipeline and a circulation inlet pipeline. The discharge pipeline includes a discharge pipe 15 and an automatic discharge valve 17 installed on it. The circulation inlet pipeline includes three branch pipelines, each equipped with a circulation valve 1# 10, a circulation valve 1# 11, and a circulation valve 1# 12. A sampling valve 33 is also installed on the circulation pipe 14 between the pipe mixer 6 and the circulation pumps.

[0027] The pipeline mixer 6 is equipped with interfaces for acid, alkali, and reducing agent. The acid dosing tank 18 is connected to the first inlet of the pipeline mixer 6, i.e., the acid interface, through the acid metering pump 21 and the acid inlet pipe 27. The alkali dosing tank 19 is connected to the second inlet of the pipeline mixer 6, i.e., the alkali interface, through the alkali metering pump 22 and the alkali inlet pipe 28. The reducing agent dosing tank 20 is connected to the third inlet of the pipeline mixer 6, i.e., the reducing agent interface, through the reducing agent metering pump 23 and the reducing agent inlet pipe 29.

[0028] Each of the acid dosing tank 18, alkali dosing tank 19, and reducing agent dosing tank 20 is equipped with an acid level sensor 30, an alkali level sensor 31, and a reducing agent level sensor 32. An automatic acid inlet valve 24 is provided on the acid inlet pipe 27, an automatic alkali inlet valve 25 is provided on the alkali inlet pipe 28, and an automatic reducing agent inlet valve 26 is provided on the reducing agent inlet pipe 29.

[0029] The acid solution in the acid dosing tank 18 is rapidly mixed with the membrane cleaning solution in the circulation pipe 14 through the acid metering pump 21 and the pipeline mixer 6 before entering the neutralization tank 1.

[0030] The alkaline solution in the alkaline dosing tank 19 is rapidly mixed with the membrane cleaning solution in the circulation pipe 14 through the alkaline metering pump 22 and the pipeline mixer 6 before entering the neutralization tank 1.

[0031] The reducing agent in the reducing agent dosing tank 20 is rapidly mixed with the membrane cleaning solution in the circulation pipe 14 through the reducing agent metering pump 23 and the pipeline mixer 6 before entering the neutralization tank 1.

[0032] The operation process of the membrane system cleaning solution neutralization device is as follows:

[0033] The membrane system cleaning solution enters the neutralization tank 1 through the inlet pipe 13. The neutralizing agents (acid, alkali, and reducing agent) are added to the circulation pipe 14 through the pipe mixer 6, allowing the neutralizing agents and membrane system cleaning solution to mix rapidly and instantaneously in the pipe mixer. Then, under the mechanical power of two circulation pumps, the solution undergoes flow mixing and neutralization. The pH meter 7 and ORP meter 8 monitor the pH and ORP values ​​of the membrane system cleaning solution in real time. When the pH and ORP values ​​meet the discharge requirements, the drain valve 17 is opened to discharge the qualified membrane system cleaning solution.

[0034] During the dosing process, when the acid level sensor 30, alkali level sensor 31, and reducing agent level sensor 32 reach low levels, an alarm is triggered, prompting the acid dosing tank 18, alkali dosing tank 19, and reducing agent dosing tank 20 to replenish the corresponding reagents. The alarm also interlocks and stops the operation of the acid metering pump 21, alkali metering pump 22, and reducing agent metering pump 23. When the level sensor 9 of the neutralization tank 1 reaches low levels, an alarm is triggered, and the first circulation pump 2 and the second circulation pump 3 are interlocked and shut down. Then, the second automatic inlet valve 4 and the third automatic inlet valve 5 are shut down.

[0035] See Figure 2 This application also provides an automatic control method for the above-mentioned neutralization device, wherein the first circulation pump 2, the second circulation pump 3, the acid metering pump 21, the alkali metering pump 22, the reducing agent metering pump 23, the acid level sensor 30, the alkali level sensor 31, the reducing agent level sensor 32, the neutralization tank level sensor 9, the pH meter 7, the ORP meter 8, the first automatic inlet valve 16, the automatic drain valve 17, the second automatic inlet valve 4, the third automatic inlet valve 5, the automatic acid inlet valve 24, the automatic alkali inlet valve 25, the automatic reducing agent inlet valve 26, the #1 circulation valve 10, the #2 circulation valve 11, and the #3 circulation valve 12 are all connected to a PLC controller.

[0036] Step 1: The membrane system cleaning solution enters the neutralization tank 1 through the inlet pipe 13. When the membrane system cleaning solution reaches the allowable circulation level of the neutralization tank 1, the first automatic inlet valve 16 and the automatic drain valve 17 are closed, and the 1# circulation valve 10, the 2# circulation valve 11, and the 3# circulation valve 12 are opened. Then, the second automatic inlet valve 4 is started, and then the first circulation pump 2 is started. When the neutralization tank reaches the high level, the third automatic inlet valve 5 is opened, and then the second circulation pump 3 is started. When the corresponding valves and pumps on the circulation pipe 14 are in the open state, the circulation stage begins. The circulation time can be adjusted according to the actual situation. The circulation continues until the pH value and ORP value are stable.

[0037] Step 2: Read the pH and ORP values ​​and determine their accuracy.

[0038] When pH>9 or ORP>800mV, open the automatic acid inlet valve 24 and the automatic reducing agent inlet valve 26, then open the acid metering pump 21 and the reducing agent metering pump 23. After the acid and reducing agent enter the pipeline mixer 6, they are instantly mixed with the membrane system cleaning solution. The dosage and time of the acid and reducing agent can be set. The acid and reducing agent undergo acid-base neutralization and redox reactions in the neutralization tank 1 and the circulation pipe 14 connected to the neutralization tank 1. Then, the dosing cycle stage begins. The dosing cycle time is adjustable. The cycle continues until the pH and ORP values ​​stabilize.

[0039] When pH < 6 or ORP > 800mV, open the automatic alkali inlet valve 25 and the automatic reducing agent inlet valve 26, and then open the alkali metering pump 22 and the reducing agent metering pump 23. After the alkali solution and reducing agent enter the pipeline mixer 6, they are instantly mixed with the membrane system cleaning solution. The dosage and time of alkali solution and reducing agent can be set. The alkali solution and reducing agent undergo acid-base neutralization reaction and redox reaction in the neutralization tank 1 and the circulation pipe 14 connected to the neutralization tank 1, and then enter the dosing cycle stage. The dosing cycle time is adjustable. The cycle continues until the pH and ORP values ​​are stable.

[0040] When the ORP and pH values ​​are stable at pH = 6-9 and ORP ≤ 800mV, open the automatic drain valve 17 and close circulation valves 1# 10, 2# 11, and 3# 12. The membrane system cleaning solution will be discharged in compliance with the standards. If the pH and ORP still do not meet the discharge requirements (pH = 6-9 and ORP ≤ 800mV), continue to add acid, alkali, and reducing agent and continue the dosing cycle.

[0041] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications are also within the protection scope of the present utility model.

Claims

1. A membrane system cleaning solution neutralization device, comprising a neutralization tank (1), characterized in that, It also includes a circulating pump, an acid dosing tank (18), an alkali dosing tank (19), a reducing agent dosing tank (20), an acid metering pump (21), an alkali metering pump (22), a reducing agent metering pump (23), and a pipeline mixer (6); the circulating pump is connected to the bottom outlet and the top circulating liquid inlet of the neutralization tank (1) through a circulating pipeline (14), and a drain outlet is provided on the circulating pipeline (14), which is connected to a drain pipe, and a drain valve (17) is provided on the drain pipe. A pipeline mixer (6) is installed on the pipeline (14). The acid dosing tank (18) is connected to the first inlet of the pipeline mixer (6) through the acid metering pump (21) and the acid inlet pipe (27). The alkali dosing tank (19) is connected to the second inlet of the pipeline mixer (6) through the alkali metering pump (22) and the alkali inlet pipe (28). The reducing agent dosing tank (20) is connected to the third inlet of the pipeline mixer (6) through the reducing agent metering pump (23) and the reducing agent inlet pipe (29).

2. The membrane system cleaning solution neutralization device according to claim 1, characterized in that, The circulation pipeline (14) is connected to the neutralization tank (1) at one end and has several branch pipelines, which are evenly distributed along the water flow direction of the neutralization tank (1).

3. The membrane system cleaning solution neutralization device according to claim 1, characterized in that, There are two circulating pumps, installed side by side.

4. The membrane system cleaning solution neutralization device according to claim 1, characterized in that, The neutralization tank (1) is equipped with a neutralization tank level gauge.

5. A membrane system cleaning solution neutralization device according to claim 1, characterized in that, A sampling port is provided on the circulation pipeline (14), and a sampling tube is connected to the sampling port. A sampling valve (33) is provided on the sampling tube.

6. The membrane system cleaning solution neutralization device according to claim 1, characterized in that, A pH meter (7) and an ORP meter (8) are installed on the circulation pipeline (14).

7. The membrane system cleaning solution neutralization device according to claim 1, characterized in that, The acid dosing tank (18), the alkali dosing tank (19), and the reducing agent dosing tank (20) are respectively equipped with an acid level gauge, an alkali level gauge, and a reducing agent level gauge.

8. A membrane system cleaning solution neutralization device according to claim 1, characterized in that, It also includes a PLC controller; The acid dosing tank (18), the alkali dosing tank (19) and the reducing agent dosing tank (20) are respectively equipped with an acid level sensor (30), an alkali level sensor (31) and a reducing agent level sensor (32), and the acid inlet pipe (27), the alkali inlet pipe (28) and the reducing agent inlet pipe (29) are respectively equipped with an automatic acid inlet valve (24), an automatic alkali inlet valve (25) and an automatic reducing agent inlet valve (26); A pH meter (7) and an ORP meter (8) are installed on the circulation pipeline (14), and the drain valve (17) is an automatic valve; The neutralization tank (1) is provided with an inlet at the front end, and an inlet pipe (13) is connected to the inlet. The inlet pipe (13) is provided with a first automatic inlet valve (16); a neutralization tank level sensor (9) is provided in the neutralization tank (1). The circulating pump includes a first circulating pump (2) and a second circulating pump (3). The inlet pipes of the first circulating pump (2) and the second circulating pump (3) are respectively equipped with a second automatic liquid inlet valve (4) and a third automatic liquid inlet valve (5). The first circulating pump (2), the second circulating pump (3), the acid metering pump (21), the alkali metering pump (22), the reducing agent metering pump (23), the acid level sensor (30), the alkali level sensor (31), the reducing agent level sensor (32), the neutralization tank level sensor (9), the pH meter (7), the ORP meter (8), the first automatic inlet valve (16), the automatic drain valve (17), the second automatic inlet valve (4), the third automatic inlet valve (5), the automatic acid inlet valve (24), the automatic alkali inlet valve (25), and the automatic reducing agent inlet valve (26) are all connected to the PLC controller.

Images