CN111375239A - Laminated self-cleaning filtering device and cleaning filtering method for sewage treatment - Google Patents

Abstract

The invention discloses a laminated self-cleaning filtering device and a cleaning filtering method for sewage treatment. The invention has stable filtering efficiency and accurate filtering effect; the structure integration level is high, and the occupied area is small; the unique control valve structure realizes full-automatic control of filtration and backwashing by one valve; the high-efficiency self-cleaning performance is realized, and the energy and the water are saved during the flushing; a back washing water pump is not needed, so that the investment is low; the corrosion resistance is good, and the service life is long; the invention has wide application prospect when being used as a rear end advanced treatment device of the effluent of a secondary sewage treatment system under the condition of increasingly strict requirements on sewage treatment discharge standards.

Description

A laminated self-cleaning filter device and cleaning and filtering method for sewage treatment

technical field

The invention relates to the field of water treatment and filtration equipment, in particular to a sewage treatment stack suitable for advanced treatment of sewage treatment systems, separation of solid suspended particles in circulating water treatment systems and reclaimed water reuse systems so that they can be recycled. A chip-type self-cleaning filter device and a cleaning and filtering method.

Background technique

With the development of society, the state has put forward higher requirements for sewage treatment technology and effluent standards. The discharge standards of sewage treatment plants and sewage treatment equipment are gradually increased to the first-level A standard, and even the surface level V or quasi-IV standard. The effluent SS is required to be less than or equal to 5mg/L. The effluent of the traditional sewage treatment sedimentation separation process cannot meet the requirements of the discharge standard and must undergo advanced treatment. Therefore, various filtration equipment is widely used in sewage treatment plants and sewage treatment equipment upgrading and upgrading. In-depth processing.

At present, the commonly used sewage or wastewater treatment filtration are quartz sand filter, activated carbon filter, multi-media filter and so on. These filters are collectively referred to as mechanical filters, which mainly intercept and absorb particulate matter and metal ions in water through filtration. Such filters are generally large in size, complex in structure, and many external pipelines; they are easy to block the filter material, have a long cleaning time, and consume a lot of energy. Defects such as large amount of water greatly reduce the filtration efficiency of the filter.

Therefore, it is an urgent problem to provide a new type of sewage treatment filtration device that is small in size, high in efficiency, can be integrated into integrated sewage treatment equipment, and at the same time is easy to operate and can realize automatic back-cleaning function.

SUMMARY OF THE INVENTION

In view of the above-mentioned deficiencies in the prior art, the present invention provides a lamination type self-cleaning filter device for sewage treatment with high integration, small volume, high filtration efficiency, low water consumption for backwashing, and automatic backwashing function and cleaning filter method.

The object of the present invention is achieved in this way:

A laminated self-cleaning filter device for sewage treatment, comprising an electric control valve 1, the electric control valve 1 is arranged above a filter housing, and a laminated filter element 12 is arranged in the filter housing;

The electric control valve 1 is a three-position, five-way electric control valve 1, which includes a valve body 13 and a drive controller 11 arranged above the valve body; the valve body 13 is provided with a water inlet A, a water outlet B, The sewage outlet C, the outer cavity interface D and the inner cavity interface E; the valve body 13 is provided with an external thread 10 that is connected and fixed with the casing; the drive controller 11 is provided with adjustment operations for displaying parameters and control buttons panel 14;

The filter housing includes an upper housing 2 and a lower housing 3 that are connected and fixed together by a quick-opening clamp 5; the top of the upper housing is provided with an internal thread structure that cooperates with the external thread 10; Two fixed supports 9 with internal threads are arranged on the casings on both sides of the upper casing to fix the filter;

The laminated filter element 12 includes a flow guide 6, a disc holder 7, a filter disc 4 and a compression spring 7; the disc holder 7 interfaces with the inner cavity on the valve body 13 through the flow guide 6 E connection;

The filter disc 4 is a circular ring sheet made of plastic, and both sides are engraved with a V-shaped radial filter channel of a certain micron size. Several filter laminations are overlapped and installed on the disc support 7. The end of the support is equipped with The compression spring 8 is used to compress the filter disc 4;

The valve body 13, the filter housing including the upper housing 2 and the lower housing 3, as well as the flow guide 6 and the lamination bracket 7 located in the filter housing are all made of corrosion-resistant high-strength plastics; The shell 3 is made of transparent plastic material;

The quick-opening clamps 5 used to connect the upper casing 2 and the lower casing 3 and the compression springs 8 used for pressing are made of corrosion-resistant stainless steel.

A cleaning and filtering method for a laminated self-cleaning filter device for sewage treatment, comprising the following steps:

Step 1: When used for advanced treatment of sewage treatment, the effluent of the secondary sedimentation tank is connected to the filter inlet A through the pressurized pump, the filter outlet B is connected to the clean water tank or the reuse water system, and the cleaning effluent is connected to the sewage pipeline by the sewage outlet C. , access the sludge tank or return to the adjustment tank;

After the pipeline is connected, the starter controller enters the automatic control state. At this time, the drive controller 13 of the three-position five-way electric control valve 1 drives the valve core to rotate to the "positive washing" position, and the valve body inlet A and the outer cavity interface D are connected. , the sewage outlet C and the inner cavity interface E are connected, and the water outlet B is in a closed state;

At this time, the drive controller 13 sends an instruction to start the filter pressurizing pump, and the effluent from the secondary sedimentation tank flows in through the filter water inlet A after being pressurized. Between the sheet filter element 12 and the filter housing, under the action of fluid pressure, the liquid penetrates the filter disc and enters the filter element, and solid impurities or suspended matter are intercepted by the filter disc;

The clean water filtered by the filter element flows out from the sewage outlet through the inner cavity interface E. At this time, the filter is in the "positive washing" working state;

When entering the working state of "washing", the drive controller 13 starts timing, and after reaching the set time, it switches to the filtering state. ;

Step 2: After reaching the set time for positive washing, the drive controller 13 drives the valve core to rotate to the "filtering" position, the water inlet A of the valve body is still connected with the outer cavity interface D, the water outlet B is connected with the inner cavity interface E, and the sewage outlet C is in the closed cutoff state;

At this time, the effluent from the secondary settling tank flows in through the filter inlet A after being pressurized. Under the diversion of the flow guide 6, through the outer cavity interface D, it enters between the laminated filter element 12 and the filter housing. Under the action of pressure, the liquid penetrates the filter disc and enters the filter element, and solid impurities or suspended matter are intercepted by the filter disc;

The clean water filtered by the filter element flows out from the water outlet B through the inner cavity interface E. At this time, the filter is in the "filtering" working state;

When entering the working state of "filtering", the drive controller 13 starts timing. As the filtration proceeds, solid impurities are continuously intercepted and accumulated, resulting in an increase in filtration resistance, an increase in differential pressure, and a decrease in filtration efficiency. It is necessary to enter the backwash state. Backwash the filter element;

Step 3: After receiving the backwash demand signal, the drive controller 13 drives the valve core to rotate to the "backwash" position, the water inlet A of the valve body is communicated with the inner cavity interface E, the sewage outlet C is communicated with the outer cavity interface D, and the outlet Nozzle B is in a closed state;

At this time, the effluent of the secondary sedimentation tank flows into the filter inlet A after being pressurized, and enters the filter element through the inner cavity interface E under the diversion of the flow guide 6, and presses the filter disc 4 under the action of the fluid pressure. The compression spring 8 is compressed, the overlapping discs are loosened, the flushing water enters the filter cavity through the gap between the discs, and the solid impurities or suspended matter are discharged from the sewage outlet through the outer cavity interface D, so that the discs can filter The device is backwashed;

Because the two sides of the disc are engraved with radial V-shaped filter channels at a certain angle to the center line, under the pressure of the flushing water, the disc vibrates and rotates, the dirt on the disc is thrown out by centrifugal force, and the water is in the filter cavity. The body forms a swirling flow, and the dirt in the cavity is quickly cleaned and discharged, so the backwashing of the device is extremely efficient and fast, and the backwashing process is completed within a few seconds to tens of seconds, and the backwashing time can be adjusted by adjusting the operation panel 14;

After the backwash reaches the set time, it switches to the normal washing state again to prepare for the next filtration, and repeats the cycle, so as to realize the automatic self-cleaning and filtration process of the filter.

In the first step: in the "positive washing" working state, the filtered clean water is not directly discharged from the water outlet B, but flows out from the sewage outlet. Impurities enter the clean water system to maximize the filtering effect;

In the second step: there are three control methods for entering the backwashing state. The first is time control. After reaching the filtering set time, it will automatically switch to the backwashing state. The filtering time can be adjusted by adjusting the operation panel 14, and the controller also Accept external differential pressure signal or flow signal, set as differential pressure control mode or flow control mode.

Positive and beneficial effects: the invention has stable filtration efficiency and accurate filtration effect; high structural integration and small footprint; unique control valve structure, one valve realizes automatic control of filtration and backwashing; efficient self-cleaning performance, flushing Energy saving and water saving; no need to install backwash pump, low investment; good corrosion resistance and long service life; as the requirements of sewage treatment and discharge standards are becoming more and more stringent, as a back-end advanced treatment device for the effluent of the secondary sewage treatment system, The invention has broad application prospects.

Description of drawings

Fig. 1 is the half-section structure schematic diagram of the present invention:

Fig. 2 is a left-view structural schematic diagram of the present invention;

Fig. 3 is the axonometric view of the present invention:

Fig. 4 is the perspective view of the present invention:

Fig. 5 is the front view of the present invention:

The picture shows: electric control valve 1, upper casing 2, lower casing 3, filter disc 4, quick-opening clamp 5, deflector 6, disc bracket 7, compression spring 8, fixed support 9 , connecting thread 10, drive controller 11, laminated filter element 12, valve body 13, operation control panel 14, water inlet A, water outlet B, sewage outlet C, outer cavity interface D, inner cavity interface E.

Detailed ways

Below in conjunction with accompanying drawing and embodiment, the present invention is further described:

As shown in FIG. 1, a laminated self-cleaning filter device for sewage treatment includes an electric control valve 1, the electric control valve 1 is arranged above the filter housing, and a stack is arranged in the filter housing. Chip filter element 12;

As shown in FIGS. 1 and 5 , the electric control valve 1 is a three-position, five-way electric control valve 1 , including a valve body 13 and a drive controller 11 arranged above the valve body; the valve body 13 is provided with There are a water inlet A, a water outlet B, a sewage outlet C, an outer cavity interface D and an inner cavity interface E; the valve body 13 is provided with an external thread 10 that is connected and fixed with the casing; the drive controller 11 is provided with a useful Adjustment operation panel 14 for displaying parameters and control buttons, as shown in Figure 3;

The filter housing includes an upper housing 2 and a lower housing 3 that are connected and fixed together by a quick-opening clamp 5; the top of the upper housing is provided with an internal thread structure that cooperates with the external thread 10; As shown in Figure 2 and Figure 4, two fixed supports 9 with internal threads are arranged on the casings on both sides of the upper casing to fix the filter;

The laminated filter element 12 includes a flow guide 6, a disc holder 7, a filter disc 4 and a compression spring 7; the disc holder 7 interfaces with the inner cavity on the valve body 13 through the flow guide 6 E connection;

The filter disc 4 is a circular ring sheet made of plastic, and both sides are engraved with a V-shaped radial filter channel of a certain micron size. Several filter laminations are overlapped and installed on the disc support 7. The end of the support is equipped with The compression spring 8 is used to compress the filter disc 4;

The valve body 13, the filter housing including the upper housing 2 and the lower housing 3, as well as the flow guide 6 and the lamination bracket 7 located in the filter housing are all made of corrosion-resistant high-strength plastics; The shell 3 is made of transparent plastic material;

The quick-opening clamps 5 used to connect the upper casing 2 and the lower casing 3 and the compression springs 8 used for pressing are made of corrosion-resistant stainless steel.

Example 1

A cleaning and filtering method for a laminated self-cleaning filter device for sewage treatment, comprising the following steps:

Step 1: When used for advanced treatment of sewage treatment, the effluent of the secondary sedimentation tank is connected to the filter inlet A through the pressurized pump, the filter outlet B is connected to the clean water tank or the reuse water system, and the cleaning effluent is connected to the sewage pipeline by the sewage outlet C. , access the sludge tank or return to the adjustment tank;

After the pipeline is connected, the starter controller enters the automatic control state. At this time, the drive controller 13 of the three-position five-way electric control valve 1 drives the valve core to rotate to the "positive washing" position, and the valve body inlet A and the outer cavity interface D are connected. , the sewage outlet C and the inner cavity interface E are connected, and the water outlet B is in a closed state;

At this time, the drive controller 13 sends an instruction to start the filter pressurizing pump, and the effluent from the secondary sedimentation tank flows in through the filter water inlet A after being pressurized. Between the sheet filter element 12 and the filter housing, under the action of fluid pressure, the liquid penetrates the filter disc and enters the filter element, and solid impurities or suspended matter are intercepted by the filter disc;

The clean water filtered by the filter element flows out from the sewage outlet through the inner cavity interface E. At this time, the filter is in the "positive washing" working state;

In the first step: in the "positive washing" working state, the filtered clean water is not directly discharged from the water outlet B, but flows out from the sewage outlet. Impurities enter the clean water system to maximize the filtering effect;

When entering the working state of "washing", the drive controller 13 starts timing, and after reaching the set time, it switches to the filtering state. ;

Step 2: After reaching the set time for positive washing, the drive controller 13 drives the valve core to rotate to the "filtering" position, the water inlet A of the valve body is still connected with the outer cavity interface D, the water outlet B is connected with the inner cavity interface E, and the sewage outlet C is in the closed cutoff state;

At this time, the effluent from the secondary settling tank flows in through the filter inlet A after being pressurized. Under the diversion of the flow guide 6, through the outer cavity interface D, it enters between the laminated filter element 12 and the filter housing. Under the action of pressure, the liquid penetrates the filter disc and enters the filter element, and solid impurities or suspended matter are intercepted by the filter disc;

The clean water filtered by the filter element flows out from the water outlet B through the inner cavity interface E. At this time, the filter is in the "filtering" working state;

When entering the working state of "filtering", the drive controller 13 starts timing. As the filtration proceeds, solid impurities are continuously intercepted and accumulated, resulting in an increase in filtration resistance, an increase in differential pressure, and a decrease in filtration efficiency. It is necessary to enter the backwash state. Backwash the filter element;

In the second step: there are three control methods for entering the backwashing state. The first is time control. After reaching the filtering set time, it will automatically switch to the backwashing state. The filtering time can be adjusted by adjusting the operation panel 14, and the controller also Accept external differential pressure signal or flow signal, set as differential pressure control mode or flow control mode.

Step 3: After receiving the backwash demand signal, the drive controller 13 drives the valve core to rotate to the "backwash" position, the water inlet A of the valve body is communicated with the inner cavity interface E, the sewage outlet C is communicated with the outer cavity interface D, and the outlet Nozzle B is in a closed state;

At this time, the effluent of the secondary sedimentation tank flows into the filter inlet A after being pressurized, and enters the filter element through the inner cavity interface E under the diversion of the flow guide 6, and presses the filter disc 4 under the action of the fluid pressure. The compression spring 8 is compressed, the overlapping discs are loosened, the flushing water enters the filter cavity through the gap between the discs, and the solid impurities or suspended matter are discharged from the sewage outlet through the outer cavity interface D, so that the discs can filter The device is backwashed;

Because the two sides of the disc are engraved with radial V-shaped filter channels at a certain angle to the center line, under the pressure of the flushing water, the disc vibrates and rotates, the dirt on the disc is thrown out by centrifugal force, and the water is in the filter cavity. The body forms a swirling flow, and the dirt in the cavity is quickly cleaned and discharged, so the backwashing of the device is extremely efficient and fast, and the backwashing process is completed within a few seconds to tens of seconds, and the backwashing time can be adjusted by adjusting the operation panel 14;

After the backwash reaches the set time, it switches to the normal washing state again to prepare for the next filtration, and repeats the cycle, so as to realize the automatic self-cleaning and filtration process of the filter.

As mentioned above, the filter disc 4 of the self-cleaning filter is engraved with a large number of V-shaped grooves of a certain micron size on both sides, a number of discs are stacked on the bracket 7, and the grooves between the discs intersect, thereby forming a series of unique filtering channels In the deep filter unit, the disc is pressed by the spring 8 and the water flow pressure during filtration. The greater the differential pressure, the stronger the pressing force, which ensures the self-locking and efficient filtration. During backwashing, under the reverse action of water pressure, the compression spring is pushed open, and a gap is formed between the discs, so that each disc can be fully cleaned.

As mentioned above, the backwashing of this device also utilizes a filtration pressure pump, and uses the water before filtration to achieve self-cleaning, without the need for additional backwashing pumps and flushing pools, the system has a simple structure, and the positive washing process before filtration ensures that the water before filtration does not It will enter the filtered clean water system, and is suitable for the occasion of advanced sewage treatment. It can also be used in similar scenarios in circulating water treatment and reclaimed water reuse, and has a wide range of applicability.

As mentioned above, the filtration control valve and filter of this device are highly integrated. One valve realizes the whole process of forward washing, filtration and backwashing. There is no external backwashing pipeline. It is small in size and light in weight, which is convenient for matching with integrated sewage treatment equipment. integrated.

As mentioned above, the filter control valve and the filter body of the device are made of corrosion-resistant high-strength plastic materials, which are resistant to corrosion, acid and alkali, and can be applied to sewage treatment, industrial wastewater treatment, circulating water treatment, and reclaimed water reuse. Use in other occasions.

The invention has the following advantages: 1. It has stable filtering efficiency and accurate filtering effect. The unique disc design and micron-level filtration precision ensure that only particles with a particle size smaller than the required size can enter the system. It is the most effective filtration system. Users can choose different precision filter discs according to their requirements. Option; 2. The present invention has high structural integration and small footprint. Modular design is adopted, the structure is highly integrated, and the floor area is extremely small. There is no complicated external backwashing pipeline of traditional filters. Under the same filtering flow, the volume of the device is only about one-tenth of the traditional sand filter, and the weight is only One twentieth of it can be easily installed into the integrated sewage treatment equipment; 3. Unique control valve structure, one valve realizes automatic control of filtration and backwashing. Using a specially designed three-position five-way electric rotary valve, through the different rotation positions of the valve core and the flow channel structure of the filter, a control valve is used to replace the four electric valves of the traditional filter. Function; 4. Efficient backwashing performance, energy saving and water saving during backwashing. The invention has extremely high backwashing performance, the device automatically switches between the states of filtration, backwashing and normal washing, and the backwashing can be completed in only tens of seconds, and the backwashing water consumption is extremely small, accounting for less than 0.5% of the water output. 5. There is no need to set up a backwash pump, and the investment is small. The invention does not need a special backwash pump, but uses the filter feed pump to realize backwash through the switching of the control valve, the system is simple, and the investment is low; 6. Good corrosion resistance and long service life: the control valve, filter element and shell are all Made of new plastic material, it is corrosion-resistant, aging-resistant, non-clogging, and the filtering and backwashing effects will not deteriorate due to use time.

With the increasingly stringent requirements of sewage treatment and discharge standards, the invention has broad application prospects as a back-end advanced treatment device for the effluent of the secondary sewage treatment system. The above embodiments have described the present invention in detail, but the content is only the preferred embodiment of the present invention, but the present invention is not limited to the above-mentioned embodiment, within the scope of knowledge possessed by those of ordinary skill in the field, the present invention Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application shall be deemed as the protection scope of this application.

Claims (10)

1. A lamination type self-cleaning filter device for sewage treatment, characterized in that it comprises an electric control valve, and the electric control valve is arranged above the filter housing, and the filter housing is provided with a lamination type filter element. 2 . The laminated self-cleaning filter device for sewage treatment according to claim 1 , wherein the electric control valve is a three-position, five-way electric control valve, comprising a valve body, which is arranged above the valve body. 3 . the drive controller; the valve body is provided with a water inlet, a water outlet, a sewage outlet, an outer cavity interface and an inner cavity interface; the valve body is provided with an external thread that is connected and fixed with the shell; the drive control The controller is provided with an adjustment operation panel for displaying parameters and control buttons. 3 . The laminated self-cleaning filter device for sewage treatment according to claim 1 , wherein the filter housing comprises an upper housing and a lower housing which are connected and fixed together by a quick-opening clamp. The casing; the top of the upper casing is provided with an inner thread structure that is matched with the outer thread; two fixing supports with inner threads are arranged on the casings on both sides of the upper casing to fix the filter. 4. A lamination type self-cleaning filter device for sewage treatment according to claim 1, characterized in that: the lamination type filter element comprises a flow guide, a disc holder, a filter disc and a compression spring; The disc support is connected with the inner cavity interface on the valve body through the flow guide. 5. A lamination type self-cleaning filter device for sewage treatment according to claim 4, characterized in that: the filter disc is a circular ring sheet made of plastic, and both sides are engraved with a V of a certain micron size. A type of radial filter channel, several filter laminations are overlapped and installed on the disc bracket, and the end of the bracket is equipped with a compression spring to compress the filter disc. 6. A laminated self-cleaning filter device for sewage treatment according to claim 4, characterized in that: the valve body, the filter housing including the upper housing and the lower housing, and the filter housing located at the filter The guides and lamination brackets in the shell are made of corrosion-resistant high-strength plastic; the lower shell is made of transparent plastic. 7. A lamination type self-cleaning filter device for sewage treatment according to claim 3, characterized in that: a quick-opening clamp for connecting the upper shell and the lower shell and a compression spring for compressing Made of corrosion-resistant stainless steel. 8. A cleaning and filtering method for a lamination type self-cleaning filter device for sewage treatment as claimed in claim 1, characterized in that, comprising the following steps: Step 1: When used for advanced treatment of sewage treatment, the effluent of the secondary sedimentation tank is connected to the water inlet of the filter through the pressurized pump, the water outlet of the filter is connected to the clear water tank or the reuse water system, and the cleaning effluent is connected to the sewage pipeline from the sewage outlet. Sludge tank or return to conditioning tank; After the pipeline is connected, the startup controller enters the automatic control state. At this time, the drive controller of the three-position, five-way electric control valve drives the valve core to rotate to the "positive washing" position. The inner cavity interface is connected, and the water outlet is in a closed state; At this time, the drive controller 13 sends an instruction to start the filter pressurizing pump, and the effluent from the secondary sedimentation tank flows into the filter water inlet after being pressurized. Between the filter housing and the filter housing, under the action of fluid pressure, the liquid penetrates the filter disc and enters the interior of the filter element, and solid impurities or suspended matter are intercepted by the filter disc; The clean water filtered by the filter element flows out from the sewage outlet through the inner cavity interface. At this time, the filter is in the "positive washing" working state; When entering the working state of "washing", the drive controller starts timing, and when the set time is reached, it switches to the filtering state. The washing time is generally set to 1 to 2 minutes, and the washing time can be adjusted by adjusting the operation panel; Step 2: After reaching the set time of positive washing, drive the controller to drive the valve core to rotate to the "filtering" position, the water inlet of the valve body is still connected with the outer cavity interface, the water outlet is connected with the inner cavity interface, and the sewage outlet is in a closed state; At this time, the effluent of the secondary sedimentation tank flows into the filter inlet after being pressurized. Under the diversion of the flow guide, it enters between the laminated filter element and the filter shell through the outer cavity interface. Under the action of fluid pressure, The liquid penetrates the filter disc and enters the inside of the filter element, and solid impurities or suspended matter are intercepted by the filter disc; The clean water filtered by the filter element flows out from the water outlet through the inner cavity interface. At this time, the filter is in the "filtering" working state; When entering the "filtering" working state, the drive controller starts timing. With the progress of filtration, solid impurities are continuously intercepted and accumulated, resulting in increased filtration resistance, increased differential pressure, and decreased filtration efficiency. It is necessary to enter the backwash state. Backwash the filter element; Step 3: After receiving the backwash demand signal, the drive controller drives the valve core to rotate to the "backwash" position, the valve body water inlet is connected to the inner cavity interface, the sewage outlet is connected to the outer cavity interface, and the water outlet is in a closed state. ; At this time, the effluent of the secondary settling tank flows into the filter inlet after being pressurized, and enters the filter element through the inner cavity interface under the diversion of the flow guide. Under the action of the fluid pressure, the compression spring of the filter disc is pressed. When compressed, the overlapping discs are loosened, the flushing water enters the filter cavity through the gap between the discs, and the solid impurities or suspended matter are discharged from the sewage outlet through the outer cavity interface, so that the discs can be backwashed by the filter; Because the two sides of the disc are engraved with radial V-shaped filter channels at a certain angle to the center line, under the pressure of the flushing water, the disc vibrates and rotates, the dirt on the disc is thrown out by centrifugal force, and the water is in the filter cavity. The body forms a swirling flow, and the dirt in the cavity is quickly cleaned and discharged, so the backwashing of the device is extremely efficient and fast, and the backwashing process can be completed within a few seconds to tens of seconds, and the backwashing time can be adjusted by adjusting the operation panel; After the backwash reaches the set time, it switches to the normal washing state again to prepare for the next filtration, and repeats the cycle, so as to realize the automatic self-cleaning and filtration process of the filter. 9 . The cleaning and filtering method for a lamination type self-cleaning filter device for sewage treatment according to claim 8 , wherein in the first step: in the working state of “washing”, the filtered clean water It is not directly discharged from the water outlet, but flows out from the sewage outlet. The purpose is to flush the filter element and the pipeline, prevent impurities in the pipeline from entering the clean water system, and maximize the filtering effect. 10. A cleaning and filtering method for a lamination type self-cleaning filter device for sewage treatment according to claim 8, characterized in that: in the second step: there are three control modes for entering the backwashing state, the first one is Time control, after reaching the filter set time, it will automatically switch to the backwash state, the filter time can be adjusted by adjusting the operation panel, the controller can also accept external differential pressure signal or flow signal, set to differential pressure control mode or flow control mode .

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