Sewage membrane filter device with automatic backwashing function

Abstract

The utility model provides a sewage membrane filter device with automatic backwash function relates to sewage treatment equipment technical field, and this device includes filter jar body, the membrane filter subassembly of being immersed in jar body, and water inlet pipeline, water outlet pipeline and sludge discharge pipeline. Its core improvement is integrated with a set of intelligent automatic backwash system, and this system is constituted by backwash water supply pipeline, gas water collaborative flushing unit, parameter detection unit and intelligent control unit. The gas water collaborative flushing unit includes the micropore aerator of being established in the membrane subassembly below jar body bottom, is used for generating tiny air bubble to carry out physical scrubbing to membrane surface, backwash water supply pipeline is connected water outlet pipe, can pump into membrane subassembly water production side with water production reversely. Control unit is based on sensor signal such as transmembrane pressure difference, and the automatic switching and collaborative operation of intelligent control gas washing, water backwash and sludge discharge process, thereby realize efficient, energy -conserving, full -automatic membrane pollution cleaning, significantly prolong the life of membrane and reduce operation maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of sewage treatment equipment technology, specifically to a sewage membrane filtration device with automatic backwashing function. Background Technology

[0002] Membrane filtration technology is widely used in wastewater treatment and reuse due to its advantages such as good effluent quality and small footprint. However, membrane fouling is an unavoidable problem in the membrane filtration process. The accumulation of pollutants on the membrane surface and inside the membrane pores leads to a decrease in membrane flux and an increase in operating pressure, eventually requiring shutdown for chemical cleaning, affecting the continuous and stable operation of the system, and increasing operating costs.

[0003] Traditional membrane cleaning methods mainly rely on manual operation, with periodic backwashing or chemical cleaning. This approach has drawbacks such as high labor intensity, difficulty in accurately timing cleaning (too early wastes water and electricity, too late leads to severe membrane fouling that is difficult to reverse), and low levels of system automation. Although some devices are equipped with backwashing functions, they often lack intelligent control, resulting in unsatisfactory backwashing effects and an inability to effectively control membrane fouling. Utility Model Content

[0004] This invention provides a wastewater membrane filtration device with automatic backwashing function, which can automatically and intelligently perform efficient backwashing of membrane modules, effectively reduce membrane fouling, extend chemical cleaning cycles, and ensure long-term stable and efficient operation of the system.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A wastewater membrane filtration device with automatic backwashing function includes: a filter tank, a membrane filtration assembly disposed within the filter tank, an inlet pipe communicating with the filter tank, an outlet pipe communicating with the product water side of the membrane filtration assembly, and a sludge discharge pipe disposed at the bottom of the filter tank, characterized in that:

[0007] It also includes an integrated automatic backwashing system, which includes a backwashing water supply pipeline, an air-water co-flushing unit, a parameter detection unit, and an intelligent control unit;

[0008] The inlet end of the backwash water supply pipeline is connected to the outlet pipeline to use the produced water for backwashing, and its outlet end is connected to the produced water side of the membrane filtration assembly.

[0009] The air-water co-flushing unit includes an air inlet pipe and a microporous aerator located at the bottom of the filter tank. The air inlet pipe is connected to an external air source and leads to the microporous aerator.

[0010] The parameter detection unit includes a transmembrane differential pressure sensor for real-time monitoring of the filtration resistance of the membrane filtration assembly, a turbidity meter for monitoring the sludge concentration in the filter tank, and a gas flow meter for monitoring the backwash gas volume.

[0011] The intelligent control unit is electrically connected to the parameter detection unit, the inlet valve on the inlet pipe, the product water valve on the outlet pipe, the backwash valve and backwash pump on the backwash water supply pipe, the air inlet valve on the air inlet pipe, and the sludge discharge valve on the sludge discharge pipe.

[0012] The intelligent control unit is configured to: perform multi-parameter fusion judgment based on feedback signals from the transmembrane differential pressure sensor and the turbidity meter; dynamically adjust the triggering timing of backwashing, the intensity and duration of air-water flushing, and the sludge discharge frequency; and execute a multi-mode flushing program including "air scrubbing - water backwashing - coordinated flushing".

[0013] Furthermore, a chemical cleaning branch is connected in parallel on the backwash water supply pipeline. This branch is equipped with a dosing pump and a dosing valve. The intelligent control unit is connected to the dosing pump and the dosing valve and is configured to automatically start the maintenance chemical enhanced backwashing program when the transmembrane pressure difference is continuously higher than a preset threshold.

[0014] Furthermore, the filter tank is equipped with a sludge hopper located below the membrane filtration assembly. The sludge discharge pipe is connected to the bottom of the sludge hopper, and the sludge discharge valve is an electrically adjustable valve with an adjustable opening. The intelligent control unit dynamically controls the opening of the sludge discharge valve and the sludge discharge time according to the reading of the turbidity meter to achieve precise sludge discharge.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0016] 1. High degree of automation: The entire cleaning process is completed automatically by receiving sensor signals or setting a time limit through the control unit, without the need for manual intervention, which reduces labor intensity and the risk of operational errors.

[0017] 2. Highly efficient and thorough cleaning: The air-water combined backwash mode is adopted. Compressed air generates a strong agitation and scrubbing effect on the membrane fiber surface, which can effectively remove attached pollutants. The backwash effect is far superior to water washing alone.

[0018] 3. Intelligent control, energy saving and consumption reduction: Backwashing can be triggered according to the actual degree of membrane fouling (judged by pressure difference), avoiding the waste of energy and water resources that may be caused by fixed-time flushing, achieving cleaning on demand, which is more intelligent and economical.

[0019] 4. Stable operation and extended lifespan: Timely and effective automatic backwashing can significantly slow down the rate of membrane flux decline, extend the chemical cleaning cycle and service life of membrane modules, and ensure the long-term stable operation of the entire wastewater treatment system.

[0020] 5. Compact structure and good integration: The components required for backwashing (water pump, air circuit, valve, control system) are highly integrated into the device. The structure is reasonably designed and easy to install and maintain. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of the filter tank in this utility model from one perspective.

[0023] Markings and component names in the diagram:

[0024] 1-Filter tank, 2-Membrane filter assembly, 3-Inlet water pipe, 4-Outlet water pipe, 5-Sludge discharge pipe, 6-Backwash water supply pipe, 7-Backwash pump, 8-Chemical cleaning branch, 9-Dosing pump, 10-Sludge hopper, 11-Air inlet pipe, 12-Air tank, 13-Drug storage tank, 14-Microporous aerator. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings.

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0027] This embodiment provides a wastewater membrane filtration device with automatic backwashing function, such as... Figure 1 and Figure 2 As shown, it includes a filter tank 1, a membrane filter assembly 2 installed inside the filter tank 1, an inlet pipe 3 connected to the filter tank 1, an outlet pipe 4 connected to the water production side of the membrane filter assembly 2, and a sludge discharge pipe 5 installed at the bottom of the filter tank 1. It also includes an integrated automatic backwashing system, which includes a backwashing water supply pipe 6, an air-water co-flushing unit, a parameter detection unit, and an intelligent control unit.

[0028] The inlet end of the backwash water supply line 6 is connected to the outlet water line 4 to use the produced water for backwashing, and its outlet end is connected to the produced water side of the membrane filter assembly.

[0029] The air-water co-flushing unit includes an air inlet pipe 11 and a microporous aerator 14 disposed at the bottom of the filter tank 1. The air inlet pipe 1 is connected to an external air source and leads to the microporous aerator 14; wherein, the external air source is an air tank 12.

[0030] The parameter detection unit includes a transmembrane differential pressure sensor for real-time monitoring of the filtration resistance of the membrane filtration assembly, a turbidity meter for monitoring the sludge concentration in the filter tank 1, and a gas flow meter for monitoring the backwash gas volume.

[0031] The intelligent control unit is electrically connected to the parameter detection unit, the inlet valve on the inlet pipe 3, the product water valve on the outlet pipe 4, the backwash valve and backwash pump 7 on the backwash water supply pipe 6, the air inlet valve on the air inlet pipe 11, and the sludge discharge valve on the sludge discharge pipe 5.

[0032] The intelligent control unit is configured to: perform multi-parameter fusion judgment based on feedback signals from the transmembrane differential pressure sensor and the turbidity meter; dynamically adjust the triggering timing of backwashing, the intensity and duration of air-water flushing, and the sludge discharge frequency; and execute a multi-mode flushing program including "air scrubbing - water backwashing - coordinated flushing".

[0033] The intelligent control unit has data storage and self-learning functions, enabling it to record historical transmembrane pressure differential growth curves and backwashing effects, and optimize the trigger thresholds and flushing parameters of subsequent backwashing procedures accordingly. The multi-mode flushing program executed by the intelligent control unit includes:

[0034] Air scrubbing mode: Close the inlet water valve and the product water valve, open the air inlet valve, and release tiny bubbles through the microporous aerator to physically agitate and scrub the membrane filter module 2.

[0035] Water backwash mode: Close the air inlet valve, open the backwash valve and backwash pump, and use the produced water to penetrate the membrane filter assembly in reverse.

[0036] Air-water co-flushing mode: The backwash valve, backwash pump and air inlet valve are opened at the same time, so that air scrubbing and water backwashing are carried out at the same time. The intelligent control unit controls the air inlet valve and backwash valve to open and close in an alternating pulse manner to form a pulsed air-water oscillation flushing effect.

[0037] A further optimization of the above embodiment is that a chemical cleaning branch 8 is connected in parallel to the backwash water supply pipeline 6. This branch is equipped with a dosing pump 9 and a dosing valve. The intelligent control unit is connected to the dosing pump 9 and the dosing valve and is configured to automatically start the maintenance chemical enhanced backwashing program when the transmembrane pressure difference is continuously higher than a preset threshold. A chemical storage tank 13 is provided on the chemical cleaning branch 8.

[0038] In a further optimization of the above embodiment, the filter tank 1 is provided with a mud hopper 10 located below the membrane filter assembly 2. The mud discharge pipeline 5 is connected to the bottom of the mud hopper 10, and the mud discharge valve is an electric regulating valve with adjustable opening. The intelligent control unit dynamically controls the opening of the mud discharge valve and the mud discharge time according to the reading of the turbidity meter to achieve precise mud discharge.

[0039] The specific working principle of this utility model is as follows:

[0040] It mainly includes two modes: "normal operation filtration" and "automatic backwashing", which are automatically switched by the intelligent control unit according to preset conditions.

[0041] I. Normal Filtering Mode

[0042] Start-up: The intelligent control unit (PLC) opens the inlet valve of the inlet pipeline and the product water valve of the outlet pipeline, and closes the backwash valve, air inlet valve and sludge discharge valve.

[0043] Filtration: Wastewater enters the filter tank and fills it. Driven by the negative pressure of the permeate pump, the wastewater penetrates the membrane wall of the membrane filter module.

[0044] Separation: Pollutants (suspended solids, colloids, etc.) are effectively trapped on the outside of the membrane fibers (feed side), while pure water passes through the membrane wall into the inside of the membrane fibers (product water side), becoming clean product water, which is discharged through the outlet pipe.

[0045] Assisted in mitigating pollution: During this process, the microporous aerator 14 can perform intermittent low-intensity aeration, generating bubbles that agitate the membrane filaments and slow down the deposition rate of pollutants.

[0046] II. Automatic backwashing mode

[0047] The intelligent control unit automatically switches from filtration mode to backwash mode when any of the following conditions are met:

[0048] Condition 1 (Timed Trigger): The continuous filtering time reaches a preset value (e.g., 30 minutes).

[0049] Condition 2 (Triggered on demand): The membrane fouling level detected by the transmembrane differential pressure sensor exceeds the set upper limit.

[0050] The backwash mode is a multi-step enhanced cleaning process, the core of which lies in the synergy of "air scrubbing" and "water backwashing":

[0051] Step 1: Stop filtration and prepare for sludge removal

[0052] The PLC shuts off the inlet and outlet water valves, stopping the filtration process.

[0053] Briefly open the sludge discharge valve to quickly discharge the high-concentration sludge from the bottom of the tank, making room for backwashing.

[0054] Step 2: Air-water synergistic backwashing (core step)

[0055] Air scrubbing: The PLC opens the air inlet valve, and compressed air is released into a large number of fine bubbles through the microporous aerator at the bottom. As the bubbles rise, they generate intense agitation, friction, and shearing action on the outer surface of the membrane fibers, "loosening" the attached contaminants.

[0056] Water backwashing: Simultaneously or alternately, the PLC activates the backwash valve and backwash pump. Clean permeate water is pumped in reverse from the inside (permeate water side) of the membrane module, penetrating the membrane wall from the inside out. This reverse water flow thoroughly washes away contaminants that have been loosened by air bubbles from the membrane surface.

[0057] Synergistic effect: The synergistic effect of air and water creates a powerful "vibration" and "flushing" effect, making the cleaning efficiency far higher than that of water washing or air washing alone.

[0058] Step 3: Thoroughly remove the mud

[0059] After backwashing is complete, close all flushing valves. Then reopen the sludge discharge valve to completely drain the backwash wastewater containing high concentrations of contaminants from the system.

[0060] Step 4: Restore Filtering

[0061] The sludge discharge valve is closed, and the inlet and product water valves are reopened, restoring the device to normal filtration mode and entering the next operating cycle.

[0062] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A wastewater membrane filtration device with automatic backwashing function, comprising: The filter tank, the membrane filtration assembly disposed within the filter tank, the inlet pipe connected to the filter tank, the outlet pipe connected to the product water side of the membrane filtration assembly, and the sludge discharge pipe disposed at the bottom of the filter tank are characterized in that: It also includes an integrated automatic backwashing system, which includes a backwashing water supply pipeline, an air-water co-flushing unit, a parameter detection unit, and an intelligent control unit; The inlet end of the backwash water supply pipeline is connected to the outlet pipeline to use the produced water for backwashing, and its outlet end is connected to the produced water side of the membrane filtration assembly. The air-water co-flushing unit includes an air inlet pipe and a microporous aerator located at the bottom of the filter tank. The air inlet pipe is connected to an external air source and leads to the microporous aerator. The parameter detection unit includes a transmembrane differential pressure sensor for real-time monitoring of the filtration resistance of the membrane filtration assembly, a turbidity meter for monitoring the sludge concentration in the filter tank, and a gas flow meter for monitoring the backwash gas volume. The intelligent control unit is electrically connected to the parameter detection unit, the inlet valve on the inlet pipe, the product water valve on the outlet pipe, the backwash valve and backwash pump on the backwash water supply pipe, the air inlet valve on the air inlet pipe, and the sludge discharge valve on the sludge discharge pipe. The intelligent control unit is configured to: perform multi-parameter fusion judgment based on feedback signals from the transmembrane differential pressure sensor and the turbidity meter; dynamically adjust the triggering timing of backwashing, the intensity and duration of air-water flushing, and the sludge discharge frequency; and execute a multi-mode flushing program including "air scrubbing - water backwashing - coordinated flushing".

2. A wastewater membrane filtration device with automatic backwashing function according to claim 1, characterized in that, A chemical cleaning branch is also connected in parallel to the backwash water supply line. The branch is equipped with a dosing pump and a dosing valve. The intelligent control unit is connected to the dosing pump and the dosing valve and is configured to automatically start the maintenance chemical enhanced backwash program when the transmembrane pressure difference is continuously higher than a preset threshold.

3. A wastewater membrane filtration device with automatic backwashing function according to claim 2, characterized in that, The filter tank is equipped with a sludge hopper located below the membrane filtration assembly. The sludge discharge pipeline is connected to the bottom of the sludge hopper, and the sludge discharge valve is an electrically adjustable valve with an adjustable opening. The intelligent control unit dynamically controls the opening of the sludge discharge valve and the sludge discharge time according to the reading of the turbidity meter to achieve precise sludge discharge.

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