Skid-mounted waste incineration fly ash washing wastewater treatment device

Abstract

The utility model belongs to the technical field of fly ash washing wastewater treatment, and particularly relates to a skid-mounted waste incineration fly ash washing wastewater treatment device. The skid-mounted waste incineration fly ash washing wastewater treatment device comprises an integrated dosing hardness and weight removal device and a membrane system device, the integrated dosing hardness and weight removal device comprises a skid-mounted steel structure, and a reaction tank I, a reaction tank II, a sludge tank and a circulating tank which are arranged on the skid-mounted steel structure and are connected in sequence, the membrane system device comprises a skid-mounted box body, and a membrane element, a conveying assembly and a cleaning water tank which are arranged in the skid-mounted box body. By adopting skid-mounted integration, the device has the advantages of convenience in installation, small occupied area, flexibility in arrangement and the like; the dosing tank body is replaced by the tank body, so that the civil engineering cost is reduced, and the investment cost is low; the membrane system has the advantages of pollution resistance, cleaning resistance, large flux and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of fly ash water washing wastewater treatment, specifically relates to a pry -on type waste incineration fly ash water washing wastewater treatment device. BACKGROUND

[0002] With the high -speed development of urbanization, the garbage disposal quantity is increasing day by day, and garbage incineration is widely used as the basic method of municipal solid waste disposal in China. Fly ash is a kind of waste by-product produced in the process of flue gas treatment in the process of garbage incineration, and it is regarded as hazardous waste treatment because it contains high salt content, heavy metal and dioxin. At present, the main means of harmless and resourceful disposal of fly ash is chelation landfill, plasma melting, fly ash washing method, etc. Fly ash treated by harmless disposal has the potential of resource utilization, and fly ash washing is widely recognized because of low energy consumption and good resource utilization effect.

[0003] Patent CN212269758U discloses a kind of fly ash water washing wastewater zero discharge system of waste incineration plant, including homogeneous conditioning tank, heavy metal removal system, folding point chlorination reaction tank, flocculation sedimentation tank, multi-medium filter, salt separation system and first evaporation crystallization system etc. connected in sequence by pipeline, which can not produce water discharge in the whole process, so as to save water resources, realize the purpose of wastewater zero discharge.

[0004] However, the homogeneous conditioning tank, homogeneous conditioning tank, flocculation sedimentation tank and other buildings of the system occupy large area, and the civil cost is high, and the overall system integration is not high. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a pry -on type waste incineration fly ash water washing wastewater treatment device to solve the technical problems of large area and high civil cost of fly ash water washing wastewater treatment system of existing waste incineration plant.

[0006] The application provides a pry -on type waste incineration fly ash water washing wastewater treatment device, which comprises:

[0007] Integrated dosing, hardness removal and heavy metal removal device and membrane system device;

[0008] The integrated dosing, hardness removal and heavy metal removal device comprises a pry -on steel structure, and reaction tank one, reaction tank two, sludge tank and circulating tank connected in sequence and arranged on the pry -on steel structure.

[0009] The membrane system device comprises a pry -on box body, and membrane elements, conveying assemblies and cleaning water tanks arranged in the pry -on box body.

[0010] In an embodiment of the application, the reaction tank one and the reaction tank two are connected through the bottom communication port;

[0011] The reaction vessel is equipped with a fly ash water washing inlet and a soda ash and caustic soda dosing inlet.

[0012] Agitators are installed on each of the reaction tanks, including reaction tank 1, reaction tank 2, sludge tank, and circulation tank.

[0013] In one embodiment of this application, the reaction vessel 2 is provided with a sodium sulfide dosing port;

[0014] The reaction tank and the sludge tank are connected by a first overflow port.

[0015] In one embodiment of this application, the sludge tank is provided with a concentrated water return port;

[0016] The sludge tank and the circulation tank are connected by a second overflow port;

[0017] The top of the circulation tank is provided with a clear liquid return port;

[0018] The bottom of the sludge tank is provided with a sludge inlet;

[0019] The bottom of the circulation tank is equipped with a circulation pump suction port.

[0020] In one embodiment of this application, the delivery assembly includes: a product water valve, an inlet water valve, a concentrate regulating manual valve, an external membrane circulation valve, a connecting valve, a concentrate valve, a flushing inlet water valve, a backwash inlet water valve, a cleaning concentrate return valve, a cleaning product water return valve, a cleaning inlet water valve, and a cleaning pump.

[0021] In one embodiment of this application, the two ends of the product water valve are respectively connected to the product water end of the membrane element and the product water tank;

[0022] The two ends of the inlet valve are respectively connected to the outlet of the circulating pump and the inlet of the membrane element;

[0023] The concentrate regulating manual valve is located at the inlet end of the membrane element and is used to manually adjust the concentrate flow rate.

[0024] The two ends of the extra-membrane circulation valve are connected to the circulation pump outlet and the sludge tank, respectively.

[0025] The connection is made by connecting the two ends of the ring to the membrane element respectively;

[0026] The two ends of the concentrate valve are respectively connected to the concentrate end of the membrane element and the concentrate return port on the sludge tank.

[0027] The two ends of the flushing inlet valve are respectively connected to the outlet of the flushing pump and the flushing inlet of the membrane element;

[0028] The two ends of the backwash inlet valve are respectively connected to the outlet end of the backwash pump and the backwash inlet end of the membrane element.

[0029] The two ends of the cleaning concentrate return valve are respectively connected to the cleaning concentrate end of the membrane element and the cleaning water tank.

[0030] The two ends of the cleaning water return valve are respectively connected to the cleaning water end of the membrane element and the cleaning water tank.

[0031] The two ends of the cleaning inlet valve are respectively connected to the outlet end of the cleaning pump and the cleaning inlet end of the membrane element;

[0032] The cleaning pump is connected to a cleaning inlet valve and a cleaning water tank at its two ends, respectively.

[0033] The beneficial effects of this utility model are:

[0034] Unlike existing technologies, this application provides a skid-mounted waste incineration fly ash washing wastewater treatment device, comprising: an integrated chemical dosing and hardening / weight removal device and a membrane system; the integrated chemical dosing and hardening / weight removal device includes: a skid-mounted steel structure, and reaction tank one, reaction tank two, sludge tank, and circulation tank sequentially connected on the skid-mounted steel structure; the membrane system includes: a skid-mounted housing, and membrane elements, conveying components, and a cleaning water tank disposed within the skid-mounted housing. By adopting a skid-mounted integrated design, it offers advantages such as convenient installation, small footprint, and flexible layout; replacing the chemical dosing tank with a main tank reduces civil engineering costs, resulting in lower investment costs; the membrane system offers advantages such as anti-fouling, washability, and high flux.

[0035] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.

[0036] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0037] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0038] Figure 1 This is a flow chart of the fly ash washing wastewater process;

[0039] Figure 2 This is a schematic diagram of an integrated chemical dosing device for hardening and de-gravity removal according to a preferred embodiment of the present invention;

[0040] Figure 3 This is a perspective view of a membrane system device according to a preferred embodiment of the present invention;

[0041] Figure 4 This is a process flow diagram of a preferred embodiment of the membrane system device of this utility model.

[0042] In the picture:

[0043] 2-1 Reactor 1, 2-2 Reactor 2, 2-3 Sludge Tank, 2-4 Circulation Tank, 2-5 Bottom Connection Port, 2-6 Fly Ash Washing Inlet, 2-7 Soda Ash / Caustic Soda Dosing Port, 2-8 Agitator, 2-9 Sodium Sulfide Dosing Port, 2-10 First Overflow Port, 2-11 Concentrate Return Port, 2-12 Second Overflow Port, 2-13 Clear Liquid Return Port, 2-14 Sludge Inlet, 2-15 Circulation Pump Suction Port, 2-16 Skid-Mounted Steel Structure;

[0044] Product water valve 3-1, Inlet water valve 3-2, Concentrate regulating manual valve 3-3, External membrane circulation valve 3-4, Connecting valve 3-5, Membrane element 3-6, Concentrate valve 3-7, Flushing inlet valve 3-8, Backwash inlet valve 3-9, Cleaning concentrate return valve 3-10, Cleaning product water return valve 3-11, Cleaning inlet valve 3-12, Cleaning pump 3-13, Cleaning water tank 3-14, Skid-mounted structure 3-15. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0046] Technical terms and definitions:

[0047] Waste incineration: A process in which appropriate thermal decomposition, combustion, and melting reactions oxidize waste at high temperatures, reducing its volume and weight, turning it into residue or molten solid matter.

[0048] Fly ash washing: A process that removes soluble salts and other harmful substances from fly ash through washing, and recovers valuable substances, thereby achieving harmlessness, volume reduction, and resource utilization.

[0049] Hardness and heavy metal removal: A method that uses appropriate chemical agents to react with calcium and magnesium hardness ions and heavy metal ions in fly ash washing solution to produce chemical precipitation, followed by physical filtration to remove hardness and heavy metals.

[0050] Figure 1The process flow diagram of fly ash washing wastewater is shown.

[0051] This application provides a skid-mounted waste incineration fly ash washing wastewater treatment device, which will be described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, in the following embodiments, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0052] See Figure 2 and Figure 3 In one embodiment, the skid-mounted waste incineration fly ash washing wastewater treatment device includes: an integrated chemical dosing device for hardening and deweighting and a membrane system device; the integrated chemical dosing device for hardening and deweighting includes: a skid-mounted steel structure 2-16, and reaction tank 2-1, reaction tank 2-2, sludge tank 2-3, and circulation tank 2-4 arranged on the skid-mounted steel structure 2-16 and connected in sequence; the membrane system device includes: a skid-mounted housing 3-15, and membrane element 3-6, conveying assembly, and cleaning water tank 3-14 arranged in the skid-mounted housing 3-15.

[0053] For details, see Figure 1 The reaction tank 2-1 and the reaction tank 2-2 are connected by a bottom connection port 2-5; the reaction tank 2-1 is equipped with a fly ash water washing inlet 2-6 and a soda ash and caustic soda dosing port 2-7; the reaction tank 2-1, the reaction tank 2-2, the sludge tank 2-3, and the circulation tank 2-4 are all equipped with a mixer 2-8.

[0054] Furthermore, the reaction vessel 2-2 is provided with a sodium sulfide dosing port 2-9; the reaction vessel 2-2 and the sludge tank 2-3 are connected by a first overflow port 2-10.

[0055] Furthermore, the sludge tank 2-3 is provided with a concentrated water return port 2-11; the sludge tank 2-3 and the circulation tank 2-4 are connected by a second overflow port 2-12; the top of the circulation tank 2-4 is provided with a clear liquid return port 2-13; the bottom of the sludge tank 2-3 is provided with a sludge inlet port 2-14; and the bottom of the circulation tank 2-4 is provided with a circulation pump suction port 2-15.

[0056] For details, see Figure 3 The conveying assembly includes: a product water valve 3-1, an inlet water valve 3-2, a concentrate regulating manual valve 3-3, an external membrane circulation valve 3-4, a connecting rod 3-5, a concentrate water valve 3-7, a flushing inlet water valve 3-8, a backwash inlet water valve 3-9, a cleaning concentrate return valve 3-10, a cleaning product water return valve 3-11, a cleaning inlet water valve 3-12, and a cleaning pump 3-13.

[0057] See Figure 3 andFigure 4 The permeate valve 3-1 is connected to the permeate end of membrane element 3-6 and the permeate tank at both ends, respectively; the inlet valve 3-2 is connected to the outlet of the circulation pump and the inlet end of membrane element 3-6 at both ends, respectively; the concentrate regulating manual valve 3-3 is located at the inlet end of membrane element 3-6 and is used to manually adjust the concentrate flow rate; the external circulation valve 3-4 is connected to the outlet of the circulation pump and the sludge tank 2-3 at both ends, respectively; the connecting valve 3-5 is connected to membrane element 3-6 at both ends, respectively; the concentrate valve 3-7 is connected to the concentrate end of membrane element 3-6 and the concentrate return port 2-11 on sludge tank 2-3 at both ends, respectively; the flushing inlet valve 3-8 is connected to the flushing pump at both ends, respectively. The outlet and the flushing inlet of membrane element 3-6; the two ends of the backwash inlet valve 3-9 are respectively connected to the outlet of the backwash pump and the backwash inlet of membrane element 3-6; the two ends of the cleaning concentrate return valve 3-10 are respectively connected to the cleaning concentrate end of membrane element 3-6 and the cleaning water tank 3-14; the two ends of the cleaning permeate return valve 3-11 are respectively connected to the cleaning permeate end of membrane element 3-6 and the cleaning water tank 3-14; the two ends of the cleaning inlet valve 3-12 are respectively connected to the outlet of cleaning pump 3-13 and the cleaning inlet end of membrane element 3-6; the two ends of the cleaning pump 3-13 are respectively connected to the cleaning inlet valve 3-12 and the cleaning water tank 3-14.

[0058] Optionally, membrane element 3-6 can be a tubular microfiltration membrane operating in a low-pressure driven cross-flow mode. A circulation pump is installed between the inlet of the membrane device and the outlet of the circulation tank 2-4. Before the membrane, an inlet flow meter, an inlet pressure gauge, and an electric inlet valve 3-2 are installed in sequence. The permeate end of the membrane device is connected to a permeate tank, and an electric permeate valve 3-1 and a permeate flow meter are installed in sequence on the permeate side. The concentrate end of the membrane device flows back to the sludge tank 2-3, and an electric concentrate valve 3-7 and a concentrate pressure gauge are installed in sequence. The flushing pipeline is equipped with an electric flushing inlet valve 3-8. The flushing water uses the permeate from the membrane system as raw water and passes through the inlet of the membrane device, the concentrate to the sludge tank 2-3, and the permeate to the permeate tank in sequence. The backwash pipeline is equipped with an electric backwash inlet valve 3-9. The backwash water uses the permeate from the membrane system as raw water and enters from the permeate side of the membrane system, exiting to the sludge tank 2-3. The cleaning pump 3-13 is installed on the membrane frame. The cleaning inlet valve 3-12, the cleaning concentrate return valve 3-10, and the cleaning permeate return valve 3-11 are all manual butterfly valves. The rinsing water uses tap water as a solvent and is mixed with hydrochloric acid, sodium hypochlorite, and caustic soda for chemical cleaning. It enters from the inlet side, while the cleaning permeate and cleaning concentrate return to the cleaning water tank 3-14.

[0059] In this embodiment, the four tanks of the integrated dosing device for hardening and heavy removal can be interconnected via flanges and fixed with brackets. The circulation tank 2-4 pumps the solution into the membrane system via a circulation pump. A portion of the solution flows back to the sludge tank 2-3 through an external membrane circulation pipeline, while another portion is pumped through a microfiltration membrane to the microfiltration permeate tank. A portion of the unfiltered concentrate returns to the sludge tank 2-3 through a concentrate pipeline.

[0060] See Figure 3 Double unions are used between membrane elements 3-6 and between membrane elements 3-6 and pipelines; flanges are used between pipelines and valves; and unions or external straight pipes are used between pipelines.

[0061] See Figures 1 to 4 In one application scenario, the operation process of the integrated chemical dosing device for hardening and heavy removal is as follows:

[0062] 1. When the system is running normally, wastewater enters reaction tank 2-1 from fly ash washing inlet 2-6. Based on the influent test results, the dosage of sodium carbonate and sodium sulfide is calculated and added to reaction tank 2-1 and reaction tank 2-2 in sequence. Then, caustic soda solution is added to reaction tank 2-1, and the pH value in reaction tank 2-1 is adjusted by PID control using the caustic soda metering pump.

[0063] 2. Once the liquid level in circulation tanks 2-4 reaches a certain level, the membrane system can be started.

[0064] 3. After the membrane system has been running for a period of time, the sludge concentrate in sludge tank 2-3 will increase. When the sludge concentration increases to about 5%, the sludge transfer pump needs to be turned on to the plate and frame filter press, and the supernatant from the filter press should be returned to the circulation tank 2-4.

[0065] 4. The membrane system operation process is divided into external membrane circulation, permeate operation, flushing, backwashing, and chemical cleaning.

[0066] 5. External circulation: First, open external circulation valve 3-4, delay for 5 seconds, and after the valve is fully open, start the circulation pump. After a period of time, turn off the circulation pump in sequence and delay for a period of time, and then close external circulation valve 3-4. The main path of external circulation is: the solution in the circulation tank flows back to the sludge tank through the circulation pump. This process mainly serves to flush the pipeline.

[0067] 6. Permeate Water Operation: During operation, sequentially open permeate valve 3-1, concentrate regulating manual valve 3-3, concentrate valve 3-7, and inlet valve 3-2, with a 5-second interval between each valve. After the valves are fully open, start the circulation pump. Once operation is stable, adjust the opening of the concentrate regulating manual valve 3-3 according to the required permeate flow rate. After running for a certain period, turn off the circulation pump and delay until there is no permeate flow. Then, sequentially close inlet valve 3-2, concentrate valve 3-7, and permeate valve 3-1. Automatic backwashing occurs every 30 to 40 minutes, after which permeate operation is automatically resumed. Under the permeate water operation program, if there are valve or equipment malfunctions, or interlocking conditions related to flow rate, pressure, or liquid level, the system will automatically stop, flush, and not re-enter permeate water operation. The main path of the permeate water operation process is as follows: the solution in the circulation tank is pumped to the microfiltration membrane via the microfiltration circulation pump; the clarified liquid passes through the microfiltration membrane to the microfiltration permeate tank; and the concentrate flows back to the sludge tank.

[0068] 7. Backwashing: First, open the concentrate valve 3-7 and the backwash inlet valve 3-9 in sequence, delay for 5 seconds, then start the backwash pump. Backwash for a certain time, then turn off the backwash pump, delay for a certain time, and then close the backwash inlet valve 3-9 and the concentrate valve 3-7 in sequence. Main backwashing path: The microfiltration permeate is backwashed through the permeate section by the backwash pump. The effluent flows through the concentrate return pipeline to the sludge tank, achieving the effect of backwashing the microfiltration membrane.

[0069] 8. Flushing: Flushing is performed after shutdown or chemical cleaning. After shutdown, the program automatically enters the flushing program. Open the flushing inlet valve 3-8, concentrate valve 3-7, and permeate valve 3-1, and start the flushing pump to flush the membrane, removing any sludge or residual liquid deposited inside. Main flushing path: The microfiltration permeate enters through the inlet via the flushing pump, following the same path as the permeate, primarily serving to flush the microfiltration membrane.

[0070] Chemical Cleaning: This chemical cleaning is manually controlled. First, before chemical cleaning, the flushing solution inside the membrane is drained. Then, the cleaning inlet valve 3-12, the cleaning concentrate return valve 3-10, and the cleaning permeate return valve 3-11 are opened, and the cleaning pump 3-13 is started to introduce the chemical. After the membrane is completely filled with the chemical, it is cleaned by circulation and soaking. The initial design is 15 minutes of circulation and 30 minutes of soaking to complete the chemical cleaning process. After the chemical cleaning is completed, the rinsing program is manually initiated to rinse away any residual chemical from the membrane. Main chemical cleaning path: The chemical inlet valve of the cleaning tank 3-14 is pumped to the membrane system through the inlet pipe via the cleaning pump 3-13. The concentrate and permeate are returned to the cleaning tank 3-14 through the cleaning concentrate return valve 3-10 and the cleaning permeate return valve 3-11, respectively, to achieve continuous circulation cleaning.

[0071] The components of each device selected in this application that do not specify a particular structure are all general standard parts or parts known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0072] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0073] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0074] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A skid-mounted waste incineration fly ash washing wastewater treatment device, characterized in that, include: Integrated chemical dosing and hard / heavy removal device and membrane system; The integrated chemical dosing device for hardening and deweighting includes: a skid-mounted steel structure (2-16), and reaction tank 1 (2-1), reaction tank 2 (2-2), sludge tank (2-3), and circulation tank (2-4) arranged on the skid-mounted steel structure (2-16) and connected in sequence. The membrane system device includes: a skid-mounted housing (3-15), and membrane elements (3-6), a conveying assembly, and a cleaning water tank (3-14) disposed within the skid-mounted housing (3-15).

2. The skid-mounted waste incineration fly ash washing wastewater treatment device according to claim 1, characterized in that, The reaction vessel one (2-1) and the reaction vessel two (2-2) are connected by a bottom connection port (2-5); The reaction vessel 1 (2-1) is equipped with a fly ash water washing inlet (2-6) and a soda ash and caustic soda dosing inlet (2-7); A mixer (2-8) is installed on each of the reaction tanks (2-1), (2-2), (2-3), and (2-4).

3. The skid-mounted waste incineration fly ash washing wastewater treatment device according to claim 2, characterized in that, The reaction vessel 2 (2-2) is equipped with a sodium sulfide dosing port (2-9); The reaction tank (2-2) and the sludge tank (2-3) are connected by a first overflow port (2-10).

4. The skid-mounted waste incineration fly ash washing wastewater treatment device according to claim 3, characterized in that, The sludge tank (2-3) is equipped with a concentrated water return port (2-11); The sludge tank (2-3) and the circulation tank (2-4) are connected by a second overflow port (2-12); The top of the circulation tank (2-4) is provided with a clear liquid return port (2-13); The bottom of the sludge tank (2-3) is provided with a sludge inlet (2-14); The bottom of the circulation tank (2-4) is provided with a circulation pump suction port (2-15).

5. The skid-mounted waste incineration fly ash washing wastewater treatment device according to claim 4, characterized in that, The conveying assembly includes: a product water valve (3-1), an inlet water valve (3-2), a concentrate regulating manual valve (3-3), an external membrane circulation valve (3-4), a connecting mandrel (3-5), a concentrate valve (3-7), a flushing inlet water valve (3-8), a backwash inlet water valve (3-9), a cleaning concentrate return valve (3-10), a cleaning product water return valve (3-11), a cleaning inlet water valve (3-12), and a cleaning pump (3-13).

6. The skid-mounted waste incineration fly ash washing wastewater treatment device according to claim 5, characterized in that, The two ends of the product water valve (3-1) are respectively connected to the product water end of the membrane element (3-6) and the product water tank; The two ends of the inlet valve (3-2) are respectively connected to the outlet of the circulating pump and the inlet of the membrane element (3-6); The concentrate regulating manual valve (3-3) is located at the inlet end of the membrane element (3-6) and is used to manually regulate the concentrate flow rate. The two ends of the extra-membrane circulation valve (3-4) are respectively connected to the circulation pump outlet and the sludge tank (2-3); The connection is made by connecting the two ends of the connector (3-5) to the membrane element (3-6) respectively; The two ends of the concentrate valve (3-7) are respectively connected to the concentrate end of the membrane element (3-6) and the concentrate return port (2-11) on the sludge tank (2-3); The two ends of the flushing inlet valve (3-8) are respectively connected to the outlet of the flushing pump and the flushing inlet of the membrane element (3-6); The two ends of the backwash inlet valve (3-9) are respectively connected to the outlet end of the backwash pump and the backwash inlet end of the membrane element (3-6); The two ends of the cleaning concentrate return valve (3-10) are respectively connected to the cleaning concentrate end of the membrane element (3-6) and the cleaning water tank (3-14); The two ends of the cleaning water return valve (3-11) are respectively connected to the cleaning water end of the membrane element (3-6) and the cleaning water tank (3-14); The two ends of the cleaning inlet valve (3-12) are respectively connected to the outlet end of the cleaning pump (3-13) and the cleaning inlet end of the membrane element (3-6); The two ends of the cleaning pump (3-13) are respectively connected to the cleaning inlet valve (3-12) and the cleaning water tank (3-14).

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