A water filtration and reuse method

Abstract

The invention discloses a water filtration and reuse method, which belongs to the field of sewage treatment and recycling, or other water treatment technologies. The physical sewage discharge component is started to flush the membrane component and the backwash tank. Raw water is retained in the membrane component. The gas storage tank is controlled to output gas with a suitable pressure value to enter the membrane component to filter the raw water, thereby solving the liquid pressure problem of the membrane component and improving the safety of the system. Then, the method enters a primary backwash treatment to further control the gas storage tank to output gas with a suitable pressure value to flush impurities in the membrane component. Then, the method enters an air forward flush treatment and a secondary backwash treatment to adopt a combination of pure water in the upper backwash tank and gas with a suitable pressure value output by the gas storage tank to flush the impurities in the membrane component again, and the impurities in the membrane component are further discharged. Finally, the air backwash treatment is adopted to blow and dry the membrane component. Effective cleaning and maintenance measures extend the service life of the filtration system.

Description

Technical Field

[0001] The present invention belongs to the field of sewage treatment and recycling, or other water treatment technologies, and in particular relates to a water filtration and reuse method. Background Art

[0002] Wastewater treatment is the process of purifying wastewater to meet the required water quality for discharge into a water body or reuse. Wastewater treatment is widely used in various fields, including construction, agriculture, transportation, energy, petrochemicals, environmental protection, urban landscapes, healthcare, and catering, and is increasingly becoming part of everyday life. Furthermore, to improve the comprehensive utilization of water resources, treating wastewater containing pollutants to make it reusable for industrial, agricultural, or other uses effectively reduces dependence on fresh water resources and minimizes the impact of wastewater on the environment, making it a crucial component of sustainable development.

[0003] For a specific filtration system, the success or failure of the engineering technology depends primarily on the filtration equipment, filter materials, and operating procedures. Problems in any one link may seriously affect the entire project. For example, even if the filtration effect meets the requirements, it will still be difficult to achieve industrialization if the investment is too large, the operating costs are high, the energy consumption is high, and the production efficiency is low. Therefore, before and during the implementation of the filtration project, it is extremely important to fully test and optimize the filtration equipment, materials, and operating procedures. Only the optimal filtration conditions (filters, pump and valve accessories, filtration mode, filtration pressure, filtration temperature, backwash media, backwash pressure, backwash time, drive mode, etc.) can bring the best overall project benefits. However, obtaining the optimal process is usually not easy. In fact, filtration test research is almost the daily work of filtration engineering technicians, and related research reports are endless. For example, a circulating water filtration system and a filtration method thereof with publication number: CN116216802A discloses that it includes: a manganese sand filtration unit, a descaling unit, a backwashing system, a safety filter, an ultrafilter, an automatic adjustment dosing device and a drain valve; the water outlet end of the manganese sand filtration unit is connected to the water inlet end connected to the descaling unit; the water outlet end of the descaling unit is connected to one end of the backwashing system, the other end of the backwashing system is connected to one end of the safety filter, the other end of the safety filter is connected to one end of the ultrafilter, the other end of the ultrafilter is connected to the automatic adjustment dosing device, and the other end of the automatic adjustment dosing device is connected to the drain valve. By setting up multi-stage pre-filtration and multi-stage detection and alarm systems, circulating water pretreatment is achieved.

[0004] However, existing water filtration systems and methods still have problems such as insufficient safety and environmental protection, and the need to improve the efficiency of effectively treating impurities and treatment efficiency as the system ages. Summary of the Invention

[0005] In order to solve the problems that the existing water filtration and reuse systems and methods are still unsafe and environmentally friendly, and whether they can effectively treat impurities and improve treatment efficiency as their service life increases, the present invention provides a water filtration and reuse system and method that further improves safety, has strong environmental performance, and can effectively treat impurities and improve treatment efficiency regardless of the service life.

[0006] The technical solution of the present invention is:

[0007] The water filtration and reuse method of the present invention comprises the following steps:

[0008] S1. Obtain the pressure information detected by the pressure sensor of the membrane assembly. When it is detected that the current pressure value reaches the pressure threshold, the operation of the membrane assembly is suspended and the physical sewage discharge assembly is started;

[0009] S2. Air exhaust: The air storage tank and pressure reducing valve of the physical wastewater drainage assembly are activated. The compressed air in the air storage tank is reduced to a first preset pressure by the pressure reducing valve and then enters the membrane assembly. The raw water remaining in the membrane assembly is exhausted, squeezed and filtered, and impurities remaining in the membrane assembly are removed.

[0010] S3. A backwash process: Start the backwash tank and the physical drainage assembly of the gas tank and the pressure reducing valve, the compressed air in the gas tank is reduced to a second preset pressure value by the pressure reducing valve, and the net liquid in the backwash tank is pushed into the membrane assembly in the reverse direction to flush the impurities in the membrane assembly;

[0011] S4. Air forward flushing: The air storage tank and pressure reducing valve of the physical wastewater discharge assembly are activated. The compressed air in the air storage tank is reduced to a third preset pressure by the pressure reducing valve and then enters the membrane assembly in a forward direction, further flushing impurities within the membrane assembly.

[0012] S5. Secondary backwash treatment: Start the backwash tank and the air tank and pressure reducing valve of the physical sewage discharge component. After the compressed air in the air tank is reduced to the fourth preset pressure value by the pressure reducing valve, the pure water in the backwash tank is pushed into the membrane assembly in the reverse direction, and then the membrane assembly is further flushed;

[0013] S6. Air backwash treatment: Start the backwash tank and the air storage tank of the physical sewage discharge component. The compressed air in the air storage tank enters the membrane component in the reverse direction through the backwash tank, and continuously blows air to the membrane component.

[0014] Furthermore, the method further comprises the following steps:

[0015] S7. Get the time interval between step S3 and step S5. When the time interval is less than the first preset time, start the chemical drainage component;

[0016] S8. Cleaning: Start the water pump, backwash tank, chemical wastewater treatment tank, and air tank. Control the chemical solution in the cleaning tank to repeatedly flow through the water pump into the membrane module and back into the cleaning tank. Control the compressed air in the air tank to first flow through the backwash tank and then into the membrane module in the reverse direction, removing impurities dissolved by the chemical solution from the membrane module.

[0017] S9. Cleaning and emptying process: Start the backwash tank and the gas tank of the chemical sewage treatment component. The compressed air in the gas tank first passes through the backwash tank and then enters the membrane component in the reverse direction, and the cleaning liquid in the membrane component flows back to the cleaning bucket;

[0018] S10. Rinsing: The backflush tank, the chemical wastewater assembly's rinse bucket, the water pump, and the air tank are activated. The pure water in the rinse bucket is repeatedly pumped into the membrane assembly and then back into the rinse bucket. Compressed air from the air tank flows through the backflush tank and then back into the membrane assembly, accelerating the removal of residual chemical liquid, rinse fluid, and impurities from the membrane assembly.

[0019] S11. Neutralization: First, add neutralizing solution to the rinse tank. Then, start the rinse tank and water pump of the chemical wastewater treatment unit. The neutralizing solution in the rinse tank is repeatedly pumped into the membrane module and then back into the rinse tank. When the pH value in the rinse tank and the membrane module is detected to be 7, turn off the rinse tank and water pump.

[0020] S12. Rinsing and emptying process: Start the backwash tank and the gas tank of the chemical blowdown assembly. The compressed air in the gas tank first passes through the backwash tank and then enters the membrane assembly in the reverse direction, and the rinsing liquid in the membrane assembly flows back to the rinsing bucket;

[0021] S13. Air backwash treatment: Start the backwash tank and the gas tank of the chemical sewage discharge component. The compressed air in the gas tank first passes through the backwash tank and then reversely enters the membrane component, continuously blowing air to the membrane component.

[0022] Furthermore, the setting of the gas pressure value output by the gas storage tank in steps S3 to S6 and steps S8 to S13 specifically includes the following sub-steps:

[0023] (11) Collect data on the filtration flow rate values ​​detected by the electromagnetic flowmeter at different gas pressure values ​​and the total energy consumption value of the water filtration and reuse system;

[0024] (12) Establish a model function of energy consumption value-gas pressure value-filter flow value. The specific model function is as follows:

[0025] C=a·P+b·Q+m;

[0026] Among them, C is the energy consumption value, P is the gas pressure value, Q is the filtration flow value, and a, b, and m are all model parameters obtained by fitting experimental data;

[0027] (13) According to the model function, the expected energy consumption value, the expected filtration flow value and the model parameters are substituted to obtain the gas pressure value under the expected energy consumption value and the expected filtration flow value.

[0028] Furthermore, the pressure threshold in step S1 is in the range of 50 kPa-200 kPa;

[0029] In step S2, the first preset pressure value is in the range of 0.2 MPa-0.3 MPa;

[0030] In step S3, the second preset pressure value is in the range of 0.2 MPa-0.3 MPa;

[0031] The third preset pressure value in step S4 is in the range of 0.5 MPa-0.6 MPa;

[0032] The fourth preset pressure value in step S5 is in the range of 0.2MPa-0.3MPa;

[0033] In step S7, the first preset time is 5 minutes to 10 minutes.

[0034] Furthermore, the raw water is a turbid mixed liquid to be treated, and the following steps are also included:

[0035] S01. The turbid mixed liquid to be treated is in the circulation tank, and the water pump is started to flow the turbid mixed liquid to be treated into the membrane module. The membrane module is filtered, and impurities remain in the membrane module. The membrane module discharges the clean liquid into the backwash tank;

[0036] S02. When the liquid level in the backflush tank is full, the clean liquid discharged from the membrane assembly flows to the clean liquid tank.

[0037] Furthermore, before step S1 starts, step S01 and step S02 are entered first; in step S7, when the time interval between step S3 and step S5 is not less than the first preset time, step S01 and step S02 are entered after step S6 is completed; when step S13 is completed, step S01 and step S02 are entered again; after step S4 is completed or before step S5 is started, the backflush pure water feed valve is started to add pure water into the backflush tank.

[0038] Furthermore, when the chemical liquid in step S8 is an acidic chemical liquid, the neutralizing liquid in step S11 is an alkaline neutralizing liquid; when the chemical liquid in step S8 is an alkaline chemical liquid, the neutralizing liquid in step S11 is an acidic neutralizing liquid.

[0039] The present invention also discloses a water filtration and reuse system, which executes the above-mentioned water filtration and reuse method, and includes: a water pump, an electromagnetic flowmeter, a membrane assembly, a backwash tank, a physical sewage discharge assembly and a chemical sewage discharge assembly. The physical sewage discharge assembly and the chemical sewage discharge assembly both include an air storage tank, and the air storage tank is used for the physical sewage discharge assembly and the chemical sewage discharge assembly. The chemical sewage discharge assembly includes a cleaning bucket and a rinsing bucket. The water pump, the electromagnetic flowmeter, the membrane assembly and the backwash tank constitute a filtration path, the air storage tank, the backwash tank and the membrane assembly constitute a physical sewage discharge path, and the air storage tank, the backwash tank, the water pump, the cleaning bucket and the rinsing bucket constitute a chemical sewage discharge path.

[0040] Furthermore, it also includes several pipelines, circulation tanks, filtration liquid inlet valves, pump outlet valves, membrane assembly manual butterfly valves, membrane assembly external exhaust valves, membrane assembly internal exhaust valves, air exhaust valves, membrane assembly manual ball valves, clean liquid outlet valves, backwash clean liquid feed valves and backwash tank exhaust valves. The membrane assembly includes a first inlet and outlet, a second inlet and outlet, a third inlet and outlet, a fourth inlet and outlet and a fifth inlet and outlet. The backwash tank includes a first inlet and outlet, a second inlet and outlet and a third inlet and outlet. The circulation tank is connected to the filtration liquid inlet valve, the water pump, the pump outlet valve, the electromagnetic flowmeter, The manual butterfly valve of the membrane assembly and the fourth inlet and outlet of the membrane assembly form a raw water channel of the filtration path. The second inlet and outlet of the membrane assembly are connected to the manual ball valve of the membrane assembly, the backwash clean liquid feed valve, the third inlet and outlet of the backwash tank and the clean liquid outlet valve in sequence through pipelines to form a clean liquid channel of the filtration path. The first inlet and outlet of the membrane assembly are connected to the exhaust valve and the air exhaust valve inside the membrane assembly through pipelines. The fifth inlet and outlet of the membrane assembly are connected to the exhaust valve outside the membrane assembly through pipelines and the first inlet and outlet of the backwash tank are connected to the backwash tank exhaust valve through pipelines to form an exhaust channel of the filtration path.

[0041] Furthermore, it also includes a recoil valve, a recoil air inlet valve, a recoil sewage butterfly valve, a recoil clean liquid feed valve, a pressure reducing valve, a forward air inlet valve and a recoil pure water feed valve. The gas tank includes an inlet, a first outlet and a second outlet. The inlet of the gas tank is connected to the second outlet of the gas tank, the recoil air inlet valve, the pressure reducing valve, the forward air inlet valve, the first inlet and outlet of the recoil tank and the recoil tank exhaust valve through a pipeline to form an exhaust channel of a physical sewage discharge path. The second inlet and outlet of the recoil tank are connected to the recoil valve, the recoil clean liquid feed valve through a pipeline. , the manual ball valve of the membrane assembly, the second inlet and outlet of the membrane assembly and the third inlet and outlet of the membrane assembly form a clean liquid channel of the physical sewage discharge path, the fourth inlet and outlet of the membrane assembly are connected to the manual butterfly valve of the membrane assembly and the backwash sewage butterfly valve in sequence through a pipeline to form a sewage pipe of the physical sewage discharge path, and the backwash pure water inlet valve and the third inlet and outlet of the backwash tank are connected through a pipeline to form a pure water channel of the physical sewage discharge path; it also includes a cleaning outlet manual valve, a rinsing outlet manual valve, a rinsing clean liquid reflux manual valve, a rinsing dirty liquid reflux manual valve, a cleaning liquid inlet valve , a cleaning liquid reflux valve, a cleaning dirty liquid reflux valve, a pipeline emptying valve, a cleaning liquid reflux manual valve and a cleaning dirty liquid reflux manual valve, the cleaning bucket includes a first inlet, a second inlet and an outlet, the rinsing bucket includes a first inlet, a second inlet and an outflow port, the outlet of the cleaning bucket is connected to the cleaning outlet manual valve through a pipeline, the outflow port of the rinsing bucket is connected to the rinsing outlet manual valve through a pipeline, the cleaning outlet manual valve and the rinsing outlet manual valve are then connected to the cleaning liquid inlet valve, water pump, pump outlet valve, electromagnetic flowmeter, membrane The components, the cleaning liquid reflux valve, the cleaning liquid reflux manual valve, the membrane component manual ball valve, the pipeline emptying valve, the cleaning liquid reflux valve, the cleaning liquid reflux manual valve, the rinse liquid reflux manual valve and the rinse liquid reflux manual valve form a cleaning liquid channel for the chemical sewage discharge path. The inlet of the gas tank is connected to the second outlet of the gas tank, the recoil air inlet valve, the pressure reducing valve, the forward air inlet valve, the membrane component, the first inlet and outlet of the recoil tank, the recoil valve, the membrane component manual ball valve and the membrane component manual butterfly valve through a pipeline to form an exhaust channel for the chemical sewage discharge path.

[0042] The beneficial effects of the present invention are:

[0043] (1) In the water filtration and reuse method, in order to solve the problem of the initial filtration flow rate value decreasing, the physical sewage discharge component is started to flush the membrane component and the backwash tank. In the gas discharge treatment, it is considered that the membrane component is suspended and there is raw water inside the membrane component, so the gas storage tank is controlled to output gas of a suitable pressure value to enter the membrane component to filter the raw water. Since the liquid pressure problem of the membrane component is solved, the safety of the system is further improved, and the raw water retained in the membrane component is not wasted, which is environmentally friendly. Then a backwash treatment is entered to further control the gas storage tank to output gas of a suitable pressure value to flush the impurities in the membrane component. The clean liquid is the raw water. The water obtained after filtration is reused, and then enters the air forward flushing treatment and the secondary backflush treatment. The impurities in the membrane component are flushed again by combining the pure water in the upper backflush tank and the gas with a suitable pressure value output by the control gas storage tank. The pure water is clean tap water. The combination of water and gas has a stronger driving force, which helps to further discharge impurities from the membrane component. Finally, considering that the filtration step needs to be re-entered after the flushing, the air backflush treatment is used to blow and dry the membrane component, ensuring that the filtration system can efficiently and reliably remove impurities in the fluid. At the same time, effective cleaning and maintenance measures are used to extend the service life of the filtration system.

[0044] (2) In the water filtration and reuse system, clear filtration paths, physical sewage discharge paths, and chemical sewage discharge paths are formed, so that the water filtration and reuse process can efficiently process impurities and facilitate equipment maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 The process of a water filtration and reuse method of the present invention is as follows Figure 1 ;

[0046] Figure 2 The process of a water filtration and reuse method of the present invention is as follows Figure 2 ;

[0047] Figure 3 This is a schematic diagram of the connection structure of a water filtration and reuse system of the present invention;

[0048] Figure numbers: 1, membrane assembly, 11, first inlet and outlet, 12, second inlet and outlet, 13, third inlet and outlet, 14, fourth inlet and outlet, 15, fifth inlet and outlet, 16, membrane assembly manual butterfly valve, 17, membrane assembly manual ball valve, 2, recoil tank, 21, first inlet and outlet, 22, second inlet and outlet, 23, third inlet and outlet, 24, recoil tank drain valve, 3, gas storage tank, 31, inlet, 32, first outlet, 33, second outlet, 4, circulation tank, 5, cleaning barrel, 51, first inlet, 52, second inlet, 53, outlet, 54, cleaning outlet manual valve, 55, cleaning liquid reflux manual valve, 56, cleaning liquid reflux manual valve, 6, rinsing barrel, 61, first inlet, 62, first Second inlet, 63, outflow port, 64, rinse outlet manual valve, 65, rinse clean liquid reflux manual valve, 66, rinse dirty liquid reflux manual valve, 7, water pump, 8, electromagnetic flowmeter, 9, pressure reducing valve, K0, filter liquid inlet valve, K1, pump outlet valve, K2, clean liquid outlet valve, K3, backflush valve, K4, forward flushing air inlet valve, K5, backflush pure water feed valve, K6, backflush air inlet valve, K7, backflush tank exhaust valve, K10, clean liquid reflux valve, K11, backflush sewage butterfly valve, K12, membrane module external exhaust valve, K13, pipeline emptying valve, K14, membrane module internal exhaust valve, K15, air exhaust valve, K16, backflush clean liquid feed valve, K17, cleaning dirty liquid reflux valve, K22, cleaning liquid inlet valve. DETAILED DESCRIPTION

[0049] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is 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 the present invention and are not intended to limit the present invention.

[0050] It should be noted that when a component is referred to as being "installed on", "provided on", "covered on", "sleeved on", or "locked on" another component, it can be directly on the other component or indirectly on the other component.

[0051] It should be understood that, in the description of the present invention, “several” means two or more than two, unless otherwise clearly and specifically defined.

[0052] In addition, the orientations or positional relationships indicated by terms such as "inside", "upper", "between", "both sides", "one side", "top", "bottom", and "side" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0053] It should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, a feature designated as "first," "second," "third," etc. may explicitly or implicitly include one or more of such features.

[0054] It should be noted that the term "and / or" in this document merely describes an association between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. A and B can each be singular or plural.

[0055] Example 1

[0056] Reference Figure 1 The present invention provides a water filtration and reuse method, comprising the following steps:

[0057] S01. The turbid mixed liquid to be treated is in the circulation tank, and the water pump is started to flow the turbid mixed liquid to be treated into the membrane module. The membrane module is filtered, and impurities remain in the membrane module. The membrane module discharges the clean liquid into the backwash tank;

[0058] S02. When the backflush tank is full, the clean liquid discharged from the membrane assembly flows to the clean liquid tank;

[0059] S1. Obtain pressure information detected by the pressure sensor of the membrane assembly. When the current pressure value reaches a pressure threshold of 50 kPa-200 kPa, the membrane assembly is suspended. Raw water (i.e., the turbid mixed liquid to be treated) remains in the membrane assembly, and the physical sewage discharge assembly is activated. It is worth noting that the pressure sensor of the membrane assembly is located within the membrane assembly and is not shown in the drawings.

[0060] S2. Air exhaust treatment: The air storage tank and pressure reducing valve of the physical sewage discharge component are activated. The compressed air in the air storage tank is reduced to a first preset pressure of 0.2MPa-0.3MPa by the pressure reducing valve. The compressed air then enters the membrane module, exhausting and squeezing the raw water remaining in the membrane module to remove impurities. This solves the problem of liquid pressure accumulation in the membrane module, further improves system safety, and does not waste the raw water remaining in the membrane module, thus achieving environmental protection.

[0061] S3. Primary backflush: The air storage tank and pressure reducing valve of the backflush tank and physical wastewater drainage assembly are activated. The compressed air in the air storage tank is reduced to a second preset pressure of 0.2MPa-0.3MPa by the pressure reducing valve. This reverses the pressure and pushes the clean liquid in the backflush tank into the membrane assembly, flushing impurities within the membrane assembly. This clean liquid is obtained by filtering the raw water, thus achieving reuse.

[0062] S4. Air forward flushing: The air storage tank and pressure reducing valve of the physical wastewater discharge assembly are activated. The compressed air in the air storage tank is reduced to a third preset pressure of 0.5 MPa-0.6 MPa by the pressure reducing valve and then enters the membrane assembly in a forward direction, further flushing impurities within the membrane assembly. The remaining clean liquid and impurities in the membrane assembly are discharged. After the completion of step S4, the backflush pure water feed valve is activated to add pure water to the backflush tank.

[0063] S5. Secondary backflush: The air storage tank and pressure reducing valve of the backflush tank and physical wastewater drainage assembly are activated. The compressed air in the air storage tank is reduced to a fourth preset pressure of 0.2MPa-0.3MPa by the pressure reducing valve. This pressure then pushes the pure water in the backflush tank back into the membrane assembly, further flushing the membrane assembly. This pure water is clean tap water, and the combination of water and air provides a stronger driving force, helping to further discharge impurities from the membrane assembly.

[0064] S6. Air backflushing treatment: Start the backflushing tank and the air tank of the physical sewage discharge component. The compressed air in the air tank enters the membrane component in reverse through the backflushing tank. Considering that the filtration step needs to be re-entered after the flushing is completed, the membrane component is continuously blown to dry the residual water on the module to prevent the raw water from combining with the residual water. This ensures that the filtration system can efficiently and reliably remove impurities in the fluid. At the same time, effective cleaning and maintenance measures are used to extend the service life of the filter.

[0065] S7. Detect the time interval between step S3 and step S5. If the time interval is less than the first preset time of 5 to 10 minutes, activate the chemical drainage assembly, indicating that impurities in the membrane assembly are stubborn and physical drainage cannot resolve the membrane assembly blockage problem. If the time interval is not less than the first preset time of 5 to 10 minutes, return to steps S01 and S02.

[0066] S8. Cleaning: Start the water pump, backwash tank, chemical wastewater treatment tank, and air tank. Control the chemical liquid in the cleaning tank to repeatedly flow through the water pump into the membrane module and back into the cleaning tank. Control the compressed air in the air tank to first pass through the backwash tank and then into the membrane module in the reverse direction, removing impurities dissolved by the chemical liquid from the membrane module. This is a continuous cleaning process, allowing the chemical liquid to fully interact with the impurities, dissolving or refining the impurities and allowing them to be removed from the membrane module.

[0067] S9. Cleaning and draining: Start the recoil tank and the air tank of the chemical drain assembly. Compressed air from the air tank flows through the recoil tank and then back into the membrane assembly, draining the cleaning liquid in the membrane assembly back into the cleaning tank. After the cleaning liquid is fully dissolved, the chemical liquid reacts with the impurities and the remaining cleaning liquid in the membrane assembly needs to be drained.

[0068] S10. Rinsing: The backflush tank, the chemical drain assembly's rinse bucket, the water pump, and the air tank are activated. Pure water in the rinse bucket is repeatedly pumped into the membrane assembly and then back into the rinse bucket. Compressed air from the air tank flows through the backflush tank and then back into the membrane assembly, accelerating the removal of residual chemical liquid, rinse liquid, and impurities from the membrane assembly. Tap water is used for this back-and-forth rinsing process to prevent the chemical liquid from altering the internal environment of the membrane assembly. After rinsing, any residual liquid in the membrane assembly must be drained.

[0069] S11. Neutralization: First, add neutralizing solution to the rinse tank. Then, start the rinse tank and water pump of the chemical wastewater treatment unit. The neutralizing solution in the rinse tank is repeatedly pumped into the membrane module and then back into the rinse tank. When the pH value in the rinse tank and the membrane module is detected to be 7, the rinse tank and water pump are turned off. Although rinsing can change the internal environment of the membrane module after cleaning, it cannot guarantee that the membrane module environment is neutral after rinsing. Therefore, further adjustment of the internal environment of the membrane module is required to prevent water quality problems in the subsequent filtration process.

[0070] S12. Rinsing and emptying process: Start the backwash tank and the gas tank of the chemical blowdown assembly. The compressed air in the gas tank first flows through the backwash tank and then enters the membrane assembly in the reverse direction, and the rinsing liquid in the membrane assembly flows back to the rinsing tank, thus emptying the residual liquid in the membrane assembly.

[0071] S13. Air backflush process: Start the backflush tank and the air tank of the chemical sewage discharge component. The compressed air in the air tank first passes through the backflush tank and then reversely enters the membrane component, continuously blowing air into the membrane component to further dry the membrane component and further ensure the filtration quality of the membrane component. After step S13 is completed, return to step S01.

[0072] Furthermore, when the chemical liquid in step S8 is an acidic chemical liquid, the neutralizing liquid in step S11 is an alkaline neutralizing liquid; when the chemical liquid in step S8 is an alkaline chemical liquid, the neutralizing liquid in step S11 is an acidic neutralizing liquid.

[0073] Furthermore, the setting of the gas pressure value output by the gas storage tank in steps S3 to S6 and steps S8 to S13 specifically includes the following sub-steps:

[0074] (11) Collect data on the filtration flow rate values ​​detected by the electromagnetic flowmeter at different gas pressure values ​​and the total energy consumption value of the water filtration and reuse system;

[0075] (12) Establish a model function of energy consumption value-gas pressure value-filter flow value. The specific model function is as follows:

[0076] C=a·P+b·Q+m;

[0077] Among them, C is the energy consumption value, P is the gas pressure value, Q is the filtration flow value, and a, b, and m are all model parameters obtained by fitting experimental data;

[0078] (13) According to the model function, the expected energy consumption value, the expected filtration flow value and the model parameters are substituted to obtain the gas pressure value under the expected energy consumption value and the expected filtration flow value. That is, in the efficient filtration process, the appropriate gas pressure value can be used to assist the system in removing impurities and prevent excessive energy consumption.

[0079] This modeling approach is suitable for analyzing and optimizing systems involving complex relationships between air pressure, filtration flow, and energy consumption, such as those found in chemical processes or industrial manufacturing. By using precise mathematical models, engineers can better understand the interactions between these parameters, thereby improving system efficiency and performance.

[0080] Example 2

[0081] Reference Figure 1 The present invention also discloses a water filtration and reuse system, which implements the above-mentioned water filtration and reuse method, and includes: a water pump 7, an electromagnetic flowmeter 8, a membrane assembly 1, a backwash tank 2, a physical sewage discharge assembly and a chemical sewage discharge assembly, the physical sewage discharge assembly and the chemical sewage discharge assembly both include an air storage tank 3, and the air storage tank 3 is commonly used for the physical sewage discharge assembly and the chemical sewage discharge assembly, the chemical sewage discharge assembly includes a cleaning bucket 5 and a rinsing bucket 6, the water pump 7, the electromagnetic flowmeter 8, the membrane assembly 1 and the backwash tank 2 constitute a filtration path, the air storage tank 3, the backwash tank 2 and the membrane assembly 1 constitute a physical sewage discharge path, the backwash tank 2 is also used to store clean liquid and pure water in the system, the air storage tank 3, the backwash tank 2, the water pump 7, the cleaning bucket 5 and the rinsing bucket 6 constitute a chemical sewage discharge path.

[0082] Furthermore, it also includes several pipelines, a circulation tank 4, a filter liquid inlet valve K0, a pump outlet valve K1, a membrane assembly manual butterfly valve 16, a membrane assembly external exhaust valve K12, a membrane assembly internal exhaust valve K14, an exhaust valve K15, a membrane assembly manual ball valve 17, a clean liquid outlet valve K2, a backwash clean liquid feed valve and a backwash tank exhaust valve K7. The membrane assembly 1 includes a first inlet and outlet 11, a second inlet and outlet 12, a third inlet and outlet 13, a fourth inlet and outlet 14 and a fifth inlet and outlet 15. The backwash tank 2 includes a first inlet and outlet 21, a second inlet and outlet 22 and a third inlet and outlet 23. The circulation tank 4 is connected to the filter liquid inlet valve K0, the water pump 7, the pump outlet valve K1, the electric The magnetic flowmeter 8, the manual butterfly valve 16 of the membrane assembly and the fourth inlet and outlet 14 of the membrane assembly 1 form a raw water channel of the filtration path. The second inlet and outlet 12 of the membrane assembly 1 is connected to the manual ball valve 17 of the membrane assembly, the backwash clean liquid feed valve, the third inlet and outlet 23 of the backwash tank 2 and the clean liquid outlet valve K2 through a pipeline to form a clean liquid channel of the filtration path. The first inlet and outlet 11 of the membrane assembly 1 is connected to the internal exhaust valve K14 and the air exhaust valve K15 of the membrane assembly through a pipeline. The fifth inlet and outlet 15 of the membrane assembly 1 is connected to the external exhaust valve K12 of the membrane assembly through a pipeline and the first inlet and outlet 21 of the backwash tank 2 is connected to the backwash tank exhaust valve K7 through a pipeline to form an exhaust channel of the filtration path.

[0083] Furthermore, it also includes a backwash valve K3, a backwash air intake valve K6, a backwash sewage butterfly valve K11, a backwash clean liquid feed valve K16, a pressure reducing valve 9, a forward air intake valve K4 and a backwash pure water feed valve K5. The gas storage tank 3 includes an inlet 31, a first outlet 32 ​​and a second outlet 33. The inlet 31 of the gas storage tank 3 is connected to the second outlet 33 of the gas storage tank 3, the backwash air intake valve K6, the pressure reducing valve 9, the forward air intake valve K4, the first inlet and outlet 21 of the backwash tank 2 and the backwash tank exhaust valve K7 through a pipeline to form an exhaust channel of a physical sewage discharge path. The second inlet and outlet 22 of the backwash tank 2 is connected to the backwash valve K3, the backwash clean liquid feed valve K16, the pressure reducing valve 9, the forward air intake valve K4 and the backwash pure water feed valve K5 through a pipeline to form an exhaust channel of a physical sewage discharge path. The feed valve K16, the manual ball valve 17 of the membrane assembly, the second inlet and outlet 12 of the membrane assembly 1 and the third inlet and outlet 13 of the membrane assembly 1 form a clean liquid channel of the physical sewage discharge path, the fourth inlet and outlet 14 of the membrane assembly 1 is connected in sequence through a pipeline to the manual butterfly valve 16 of the membrane assembly and the backwash sewage butterfly valve K11 to form a sewage pipe of the physical sewage discharge path, and the backwash pure water inlet valve and the third inlet and outlet 23 of the backwash tank 2 are connected through a pipeline to form a pure water channel of the physical sewage discharge path; it also includes a cleaning outlet manual valve 54, a rinsing outlet manual valve 64, a rinsing liquid reflux manual valve 65, a rinsing liquid reflux manual valve 66, a cleaning liquid inlet valve K22, and a cleaning liquid Reflux valve K10, cleaning liquid reflux valve K17, pipeline emptying valve K13, cleaning liquid reflux manual valve 55 and cleaning liquid reflux manual valve 56, the cleaning bucket 5 includes a first inlet 51, a second inlet 52 and an outlet 53, the rinsing bucket 6 includes a first inlet 61, a second inlet 62 and an outflow 63, the outlet of the cleaning bucket 5 is connected to the cleaning outlet manual valve 54 through a pipeline, the outflow 63 of the rinsing bucket 6 is connected to the rinsing outlet manual valve 64 through a pipeline, the cleaning outlet manual valve 54 and the rinsing outlet manual valve 64 are then connected to the cleaning liquid inlet valve K22, the water pump 7, the pump outlet valve K1, the electromagnetic flowmeter 8, The membrane assembly 1, the cleaning dirty liquid reflux valve K17, the cleaning dirty liquid reflux manual valve 56, the membrane assembly manual ball valve 17, the pipeline emptying valve K13, the cleaning clean liquid reflux valve K10, the cleaning dirty liquid reflux manual valve 56, the rinsing clean liquid reflux manual valve 65 and the rinsing dirty liquid reflux manual valve 66 form a cleaning liquid channel for the chemical sewage discharge path. The inlet of the gas storage tank 3 is connected to the second outlet 33 of the gas storage tank 3, the recoil air inlet valve K6, the pressure reducing valve 9, the forward air inlet valve K4, the membrane assembly 1, the first inlet and outlet 21 of the recoil tank 2, the recoil valve K3, the membrane assembly manual ball valve 17 and the membrane assembly manual butterfly valve 16 through a pipeline to form an exhaust channel for the chemical sewage discharge path.

[0084] Reference Figure 3 The recoil tank 2 is also connected to a recoil tank drain valve 24 , through which the sewage in the recoil tank 2 is discharged.

[0085] In addition to the electrically controlled valves, the water filtration and reuse system of the present invention also has manual valves. The reason for this is to facilitate the inspection and maintenance of the system by maintenance personnel and to prevent the occurrence of emergencies.

[0086] In combination with the above specific structure, it is again explained that the water filtration and reuse method of the present invention specifically includes the following steps:

[0087] S01. The turbid mixed liquid to be treated, i.e., the raw water, is in the circulation tank 4. The water pump 7 is started, and the clean liquid outlet valve K2 is closed. The raw water is sequentially connected through the pipeline to the filter liquid inlet valve K0, the water pump 7, the pump outlet valve K1, the electromagnetic flowmeter 8, the manual butterfly valve 16 of the membrane module, and the fourth inlet and outlet 14 of the membrane module 1, i.e., the raw water channel of the filtration path. At the same time, the membrane module external exhaust valve K12 and the membrane module internal exhaust valve K14 are also started. The gas in the membrane module 1 is connected to the membrane module internal exhaust valve K14 through the pipeline from the first inlet and outlet 11, and the gas in the membrane module 1 is connected to the membrane module internal exhaust valve K14 through the pipeline from the fifth inlet and outlet 15. Connect the outer exhaust valve K12 of the membrane module, that is, the exhaust channel of the filtration path to discharge into the concentration tank, and open the exhaust valve K7 of the backwash tank to discharge the gas into the concentration tank. After starting the water pump for 75 seconds, it is necessary to close the outer exhaust valve K12 of the membrane module and the inner exhaust valve K14 of the membrane module, and let the turbid mixed liquid to be treated flow into the membrane module 1, and be filtered by the membrane module 1. The impurities remain in the membrane module 1. After filtration, the clean liquid is obtained from the second inlet and outlet 12 of the membrane module 1, through the pipeline, through the manual ball valve 17 of the membrane module and the backwash semen feed valve, that is, the clean water channel of the filtration path, and enters from the third inlet and outlet 13 of the backwash tank 2;

[0088] S02. When the liquid level in the backwash tank 2 is full, close the backwash tank exhaust valve K7 and the backwash net liquid feed valve K16, open the net liquid outlet valve K2, the net liquid flows from the second inlet and outlet 12 of the membrane assembly 1 through the manual ball valve and the net liquid outlet valve K2 connected by a pipe to the net liquid tank;

[0089] S1. Obtain the pressure information detected by the pressure sensor of the membrane assembly. When the current pressure value reaches 50-200 kPa, it is necessary to suspend the operation of the membrane assembly 1, that is, stop the operation of the water pump 7, keep the clean liquid outlet valve K2 open, close the filter liquid inlet valve K0 and the pump outlet valve K1, open the membrane assembly exhaust valve K15, and start the physical sewage discharge component;

[0090] S2. Air exhaust: Start the air storage tank 3 and pressure reducing valve 9 of the physical wastewater drainage component. The compressed air in the air storage tank 3 is reduced to 0.2MPa-0.3MPa through the pressure reducing valve 9 and enters the membrane module 1. The raw water retained in the membrane module 1 is exhausted and squeezed out, and the impurities in the membrane module 1 are left. After the clean liquid is discharged from the clean liquid outlet valve K2, the clean liquid outlet valve K2 and the air exhaust valve K15 are closed after 5 seconds.

[0091] S3. Primary backflush process: Start backflush tank 2 and the air storage tank 3 and pressure reducing valve 9 of the physical sewage discharge assembly. Close backflush valve K3, open backflush air inlet valve K6 and backflush sewage butterfly valve K11. The compressed air from air storage tank 3 is reduced to 0.2MPa-0.3MPa through pressure reducing valve 9, pushing the clean liquid in backflush tank 2 into membrane assembly 1 in the opposite direction. After 5 seconds, backflush valve K3 is opened, and impurities in membrane assembly 1 are discharged through backflush sewage butterfly valve K11 to the concentrator. After another 5 seconds, close backflush valve K3 and backflush air inlet valve K6.

[0092] S4. Air forward flushing: Start the physical wastewater discharge assembly's air storage tank 3 and pressure reducing valve 9. Open the forward flushing air inlet valve K4, the backwash pure water feed valve K5, and the backwash tank exhaust valve K7. Compressed air from the air storage tank 3 is reduced to 0.5MPa-0.6MPa via the pressure reducing valve 9 and enters the membrane assembly 1, further flushing impurities within the membrane assembly 1. Pure water is then added to the backwash tank 2. After 5 seconds, the forward flushing air inlet valve K4 is closed. The liquid level sensor in the backwash tank 2 senses that the liquid is full. The backwash pure water feed valve K5 and the backwash tank exhaust valve K7 are closed, flushing any remaining solid particles downward to the concentrator tank. This completes the replenishment of pure water to the backwash tank 2.

[0093] S5. Secondary backflush: Start backflush tank 2 and the air storage tank 3 and pressure reducing valve 9 of the physical sewage discharge assembly. Close backflush valve K3 and open backflush air inlet valve K6. The compressed air in air storage tank 3 is reduced to 0.2MPa-0.3MPa by pressure reducing valve 9, pushing the pure water in backflush tank 2 into membrane assembly 1, further flushing membrane assembly 1. After 5 seconds, open backflush valve K3, allowing the clean water to flow to the concentrator. After 5 seconds, close backflush valve K3 and backflush air inlet valve K6.

[0094] S6. Air backwash treatment: Start the backwash tank 2 and the air storage tank 3 of the physical sewage discharge component, close the backwash valve K3, open the backwash air inlet valve K6 and the backwash sewage butterfly valve K11, and the compressed air in the air storage tank 3 first passes through the backwash tank 2 and then reverses into the membrane component 1. After 5 seconds, open the backwash valve K3 and continue to blow air into the membrane component 1. After 10 seconds, close the backwash valve K3, the backwash air inlet valve K6 and the backwash sewage butterfly valve K11.

[0095] S7. Get the time interval between step S3 and step S5. When the time interval is less than 5 minutes to 10 minutes, suspend the work of the membrane assembly 1 and start the chemical blowdown assembly;

[0096] S8. Cleaning process: Start the water pump 7, backwash tank 2, cleaning barrel 5 of the chemical sewage discharge component and gas tank 3, close the backwash valve K3, open the pump outlet valve K1, backwash air inlet valve K6, cleaning liquid reflux valve K10, membrane component external exhaust valve K12, cleaning liquid reflux valve K17 and cleaning liquid inlet valve K22, start the water pump 7, the chemical liquid in the cleaning barrel 5 repeatedly enters the membrane component 1 through the water pump 7 and then flows back to the cleaning barrel 5, the compressed air in the gas tank 3 first passes through the backwash tank 2 and then reversely enters the membrane component 1, the cleaning liquid circulates in the membrane component 1 to dissolve the blockage, close the membrane component external exhaust valve K12 after 5 seconds, and close the cleaning liquid reflux valve after 10 minutes. Valve K10, open the backflush valve K35s, then close the backflush valve K3, open the clean liquid reflux valve K10, and use compressed air to backflush the membrane assembly 1, forcing the blockage to leave the membrane assembly 1, helping to open the filtration channel of the membrane assembly 1 and remove the impurities dissolved by the chemical liquid from the membrane assembly 1. Switch the backflush valve K3 and the clean liquid reflux valve K10 open / close for 5 seconds every 10 minutes. Continue cleaning for 4 hours. After 4 hours, close the backflush valve K3, pump outlet valve K1, backflush air inlet valve K6, clean liquid reflux valve K10, membrane assembly external exhaust valve K12, dirty cleaning liquid reflux valve K17 and cleaning liquid inlet valve K22, and suspend the operation of water pump 7;

[0097] S9. Cleaning and emptying process: Start the backflush tank 2 and the gas tank 3 of the chemical wastewater treatment component, close the backflush valve K3 and the forward flushing air inlet valve K4, open the backflush air inlet valve K6 and the pipeline emptying valve K13, and the compressed air from the gas tank 3 first passes through the backflush tank 2 to prepare for backflush. After 5 seconds, the backflush air inlet valve K6 is closed, and the backflush valve K3 and the forward flushing air inlet valve K4 are opened. The air then enters the membrane module 1 in the reverse direction. The compressed air drives out the cleaning liquid, which flows back to the cleaning tank 5 through the pipeline emptying valve K13. After 10 seconds, the backflush valve K3, the forward flushing air inlet valve K4, the backflush air inlet valve K6 and the pipeline emptying valve K13 are closed;

[0098] S10. Rinsing treatment: Start the backwash tank 2, the rinsing bucket 6 of the chemical sewage discharge component, the water pump 7 and the air tank 3, close the backwash valve K3, open the pump outlet valve K1, the backwash air inlet valve K6, the cleaning liquid reflux valve K10, the membrane module external exhaust valve K12, the cleaning liquid reflux valve K17 and the cleaning liquid inlet valve K22, the compressed air from the air tank 3 first passes through the backwash tank 2 to prepare for backwashing, the pure water in the rinsing bucket 6 repeatedly enters the membrane module 1 through the water pump 7, the rinsing liquid circulates in the membrane module 1, mixes and cleans the residual acid / alkali, closes the membrane module external exhaust valve K12 after 5s, closes the cleaning liquid reflux valve K10 every 10 minutes, opens the backwash valve K3 for 5 seconds, then closes the backwash valve K3, opens the cleaning liquid reflux valve K10, and repeats for half an hour. The compressed air backwashes the membrane module 1 to accelerate the mixing of the rinsing liquid and the residual acid / alkali;

[0099] S11. Neutralization: First, add neutralizing solution to the rinse tank 6. After half an hour, repeatedly add small amounts of acid / base to the rinse tank 6 to adjust the pH to neutral. Then, start the rinse tank 6 and water pump 7 of the chemical wastewater drainage assembly. The neutralizing solution in the rinse tank 6 repeatedly flows through the water pump 7 into the membrane module 1 and back into the rinse tank 6. When the pH values ​​in the rinse tank 6 and the membrane module 1 are both 7, close the rinse tank 6 and water pump 7. Also close the pump outlet valve K1, backflush valve K3, backflush inlet valve K6, clean liquid reflux valve K10, membrane module external exhaust valve K12, dirty cleaning liquid reflux valve K17, and cleaning liquid inlet valve K22, and pause the water pump 7.

[0100] S12. Rinsing and draining: Start backflush tank 2 and the chemical drainage assembly's air tank 3. Close the backflush valve K3 and forward flushing inlet valve K4. Open the backflush inlet valve K6 and the pipeline drain valve K13. Compressed air from air tank 3 flows through backflush tank 2 and then back into membrane assembly 1, forcing the rinsing liquid in membrane assembly 1 back into rinsing tank 6. In other words, the compressed air displaces the rinsing liquid, which then flows back into rinsing tank 6 through pipeline drain valve K13. After 10 seconds, close the backflush valve K3, forward flushing inlet valve K4, backflush inlet valve K6, and pipeline drain valve K13.

[0101] S13. Air backwash treatment: Start the backwash tank 2 and the gas tank 3 of the chemical sewage discharge component, close the backwash valve K3, open the backwash air inlet valve K6 and the backwash sewage butterfly valve K11, and the compressed air in the gas tank 3 first passes through the backwash tank 2 to prepare for backwashing. After 5 seconds, open the backwash valve K3, and the air then enters the membrane assembly 1 in the reverse direction, and continues to blow air into the membrane assembly 1. After 10 seconds, close the backwash valve K3, the backwash air inlet valve K6 and the backwash sewage butterfly valve K11.

[0102] It is worth mentioning that the value measured by the electromagnetic flowmeter is used to monitor the flux of the membrane assembly at the current frequency. It is also a very important data that directly reflects the patency of the membrane assembly.

[0103] In summary, the opening / closing time of the valve is reasonably designed to ensure that the gas will not be squeezed in the system and cause safety problems. Due to the precise time control, the service life of the system is also guaranteed, and it is more convenient to inspect and maintain.

[0104] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A water filtration and reuse method, characterized in that: The following steps are involved: S1. Obtain the pressure information detected by the pressure sensor of the membrane assembly. When the current pressure value reaches the pressure threshold of 50kPa-200kPa, the membrane assembly is suspended and the physical sewage discharge assembly is started; S2. Air exhaust treatment: The air storage tank and pressure reducing valve of the physical sewage discharge component are activated. The compressed air in the air storage tank is reduced to a first preset pressure of 0.2MPa-0.3MPa by the pressure reducing valve and then enters the membrane module. The raw water retained in the membrane module is exhausted and squeezed and filtered, leaving impurities in the membrane module. S3. A backwash process: Start the backwash tank and the physical drainage assembly of the gas tank and the pressure reducing valve, the compressed air in the gas tank is reduced to a second preset pressure value of 0.2MPa-0.3MPa by the pressure reducing valve, and the net liquid in the backwash tank is pushed into the membrane assembly in the reverse direction to flush the impurities in the membrane assembly; S4. Air forward flushing: The air tank and pressure reducing valve of the physical wastewater discharge assembly are activated. The compressed air in the air tank is reduced to a third preset pressure of 0.5 MPa-0.6 MPa by the pressure reducing valve and then enters the membrane assembly in a forward direction, further flushing impurities within the membrane assembly. S5. Secondary backwash treatment: Start the backwash tank and the air tank and pressure reducing valve of the physical sewage discharge component. After the compressed air in the air tank is reduced to the fourth preset pressure value of 0.2MPa-0.3MPa by the pressure reducing valve, the pure water in the backwash tank is pushed into the membrane assembly in the reverse direction, and then the membrane assembly is further flushed; S6. Air backwash treatment: Start the backwash tank and the air storage tank of the physical blowdown assembly. The compressed air in the air storage tank enters the membrane assembly in the reverse direction through the backwash tank, continuously blowing air into the membrane assembly. S7 obtains the time interval between step S3 and step S5, when the time interval is less than the first preset time 5 minutes -10 minutes, start the chemical sewage component; S8. Cleaning: Start the water pump, backwash tank, chemical wastewater treatment tank, and air tank. Control the chemical solution in the cleaning tank to repeatedly flow through the water pump into the membrane module and back into the cleaning tank. Control the compressed air in the air tank to first flow through the backwash tank and then into the membrane module in the reverse direction, removing impurities dissolved by the chemical solution from the membrane module. S9. Cleaning and emptying process: Start the backwash tank and the gas tank of the chemical sewage treatment component. The compressed air in the gas tank first passes through the backwash tank and then enters the membrane component in the reverse direction, and the cleaning liquid in the membrane component flows back to the cleaning bucket; S10. Rinsing: The backflush tank, the chemical wastewater assembly's rinse bucket, the water pump, and the air tank are activated. The pure water in the rinse bucket is repeatedly pumped into the membrane assembly and then back into the rinse bucket. Compressed air from the air tank flows through the backflush tank and then back into the membrane assembly, accelerating the removal of residual chemical liquid, rinse fluid, and impurities from the membrane assembly. S11. Neutralization: First, add neutralizing solution to the rinse tank. Then, start the rinse tank and water pump of the chemical wastewater treatment unit. The neutralizing solution in the rinse tank is repeatedly pumped into the membrane module and then back into the rinse tank. When the pH value in the rinse tank and the membrane module is detected to be 7, turn off the rinse tank and water pump. S12. Rinsing and emptying process: Start the backwash tank and the gas tank of the chemical blowdown assembly. The compressed air in the gas tank first passes through the backwash tank and then enters the membrane assembly in the reverse direction, and the rinsing liquid in the membrane assembly flows back to the rinsing bucket; S13. Air backwash treatment: Start the backwash tank and the gas tank of the chemical sewage discharge component. The compressed air in the gas tank first passes through the backwash tank and then reversely enters the membrane component, continuously blowing air to the membrane component.

2. The water filtration and reuse method according to claim 1, characterized in that: The setting of the gas pressure value output by the gas storage tank in steps S3 to S6 and steps S8 to S13 specifically includes the following sub-steps: (11) Collect data on the filtration flow rate values ​​detected by the electromagnetic flowmeter at different gas pressure values ​​and the total energy consumption value of the water filtration and reuse system; (12) Establish a model function of energy consumption value-gas pressure value-filter flow value. The specific model function is as follows: Among them, C is the energy consumption value, P is the gas pressure value, Q is the filtration flow value, and a, b, and m are all model parameters obtained by fitting experimental data; (13) According to the model function, the expected energy consumption value, the expected filtration flow value and the model parameters are substituted to obtain the gas pressure value under the expected energy consumption value and the expected filtration flow value.

3. The water filtration and reuse method according to claim 1, characterized in that: The raw water is a turbid mixed liquid to be treated, and the process further comprises the following steps: S01. The turbid mixed liquid to be treated is in the circulation tank, and the water pump is started to flow the turbid mixed liquid to be treated into the membrane module. The membrane module is filtered, and impurities remain in the membrane module. The membrane module discharges the clean liquid into the backwash tank; S02. When the liquid level in the backflush tank is full, the clean liquid discharged from the membrane assembly flows to the clean liquid tank.

4. The water filtration and reuse method according to claim 3, characterized in that: Before step S1 starts, step S01 and step S02 are entered first; in step S7, when the time interval between step S3 and step S5 is not less than the first preset time, step S01 and step S02 are entered after step S6 is completed; after step S13 is completed, step S01 and step S02 are entered again; after step S4 is completed or before step S5 is started, the backflush pure water feed valve is started to add pure water into the backflush tank.

5. The water filtration and reuse method according to claim 1, characterized in that: When the chemical liquid in step S8 is an acidic chemical liquid, the neutralizing liquid in step S11 is an alkaline neutralizing liquid; When the chemical liquid in step S8 is an alkaline chemical liquid, the neutralizing liquid in step S11 is an acidic neutralizing liquid.

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