High-pressure flushing type water treatment system

Abstract

The utility model relates to the technical field of sewage treatment, in particular to a high-pressure flushing type water treatment system, which comprises a membrane tank and a flushing system, a membrane frame is arranged in the membrane tank, and a membrane wire component is arranged on the membrane frame; the flushing system comprises a dosing pipeline, a dosing tank, a dosing pump, a reclaimed water pipeline, a pipeline mixer, a booster pump and a plurality of first nozzles. According to the utility model, the defects in the prior art that the membrane tank needs to be cleaned manually at regular intervals on the basis of an aeration flushing system, the labor is consumed, and the aeration flushing system can increase the dissolved oxygen of sewage to reduce the biological phosphorus removal efficiency are overcome, and the traditional aeration flushing system is cancelled, so that the energy consumption is reduced, and the energy consumption is reduced. The physical and chemical synergistic cleaning mode of high-pressure water flow stripping and chemical oxidation is adopted, the cleaning efficiency of the membrane filament assembly can be greatly improved, the step of manual regular manual cleaning is omitted, and manpower consumption is reduced. And the dissolved oxygen content of the sewage in the membrane tank is reduced, so that the biological phosphorus removal efficiency is improved, and the consumption of a phosphorus removal agent is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewage treatment technical field more specifically, relate to a high pressure flush formula water treatment system. BACKGROUND

[0002] MBR is a kind of high-efficiency sewage treatment and reuse technology combining biodegradation and membrane separation technology, is widely used in municipal sewage, industrial wastewater, hospital wastewater and other fields, its characteristics are using microfiltration / ultrafiltration membrane to replace traditional secondary sedimentation tank, realize mud-water efficient separation.

[0003] In MBR sewage treatment system, membrane pollution is a common problem.For reducing membrane pollution, the existing water treatment system often uses aeration flushing system to shake membrane filaments to remove sludge attached to the surface of membrane filaments.For example, the MBR sewage treatment machine disclosed in the prior art comprises an integrated anaerobic tank, MBR membrane tank and disinfection tank connected in sequence.The anaerobic tank is provided with a sewage inlet on the side wall away from the MBR membrane tank, and the pool wall of the anaerobic tank is provided with elastic filler, and two rows of anaerobic tank partitions are vertically arranged in the anaerobic tank, and the two rows of anaerobic tank partitions are fixed on the top cover and the bottom wall of the anaerobic tank alternately.The bottom of MBR membrane tank is provided with aeration pipeline, and the aeration pipeline is connected with a blower, and the bottom of MBR membrane tank is connected with a reflux pump away from the anaerobic tank, and the water outlet of the reflux pump is connected to the sewage inlet of the anaerobic tank.The disinfection tank is connected with a disinfection device, and two rows of disinfection tank partitions are vertically and spaced apart in the disinfection tank, and the two rows of disinfection tank partitions are fixed on the top cover and the bottom wall of the disinfection tank alternately.

[0004] As the aeration flushing system of the above-mentioned prior art, the cleaning of membrane filaments mainly depends on the shearing force of bubbles.As bubbles are easy to gather, the root of membrane filaments is easy to be cleaned insufficiently, and the aeration flushing system mainly removes pollutants on the surface of membrane through physical flushing effect, and the removal effect of organic matter and microorganisms is relatively limited, so the prior art also needs to be stopped regularly, the water in the membrane tank is emptied, and then chemical agents are used to soak the membrane filaments, and finally the membrane filaments are manually cleaned.A chemical cleaning cycle is generally 6 to 12 hours, which not only consumes more manpower, but also reduces the water treatment efficiency.Secondly, the aeration flushing system needs to be turned on for 24 hours every day, which consumes more energy and leads to high operating cost.Thirdly, the aeration flushing system increases the dissolved oxygen in membrane reflux, affects the biological phosphorus removal effect, and increases the consumption of phosphorus removal agent. UTILITY MODEL CONTENTS

[0005] In view of the problems that the water treatment system in the prior art needs to manually clean the membrane pool on the basis of the aeration flushing system periodically, which consumes more manpower, and the aeration flushing system increases the dissolved oxygen content of the sewage and reduces the biological phosphorus removal efficiency, the utility model provides a high-pressure flushing type water treatment system, which can clean the membrane filaments in the membrane pool on line efficiently, does not need manual operation, can reduce the manpower and can improve the biological phosphorus removal efficiency.

[0006] To solve the above technical problems, the utility model provides a technical scheme which is:

[0007] A high-pressure flushing type water treatment system, comprising a membrane pool and a flushing system, wherein the membrane pool is internally provided with a membrane rack, and the membrane rack is provided with a membrane filament assembly; the flushing system comprises a dosing pipeline, a dosing tank, a dosing pump, a reclaimed water pipeline, a pipeline mixer, a booster pump and a plurality of first spray heads; the inlet end of the dosing pipeline is in communication with the dosing tank, the dosing pump is arranged on the dosing pipeline, and the outlet end of the dosing pipeline is in communication with the reclaimed water pipeline; the pipeline mixer and the booster pump are both arranged on the reclaimed water pipeline, and the pipeline mixer is located between the outlet end of the dosing pipeline and the booster pump; the first spray heads are all located in the inner cavity of the membrane pool, and the water outlets of the first spray heads are all in communication with the outlet end of the reclaimed water pipeline.

[0008] It should be noted that the structure and working principle of the membrane rack and the membrane filament assembly are both prior art, and the present specification will not be described in detail.

[0009] In the above technical scheme, the dosing tank can store sodium hypochlorite or other oxidizing cleaning agents, and the present specification takes sodium hypochlorite as the oxidizing cleaning agent. After the membrane filament assembly in the membrane pool operates for a period of time, the dosing pump can be started to pump the sodium hypochlorite in the dosing tank into the pipeline mixer, and at the same time, the reclaimed water pipeline can deliver clean water into the pipeline mixer, so that the sodium hypochlorite and the clean water are mixed in a certain proportion. Then the booster pump is started to pressurize the sodium hypochlorite solution in the pipeline mixer, and the sodium hypochlorite solution is sprayed into the inner cavity of the membrane pool in the form of high-pressure jet flow. After the sodium hypochlorite solution is sprayed into the inner cavity of the membrane pool, high-speed turbulent flow is formed in the sewage, and the water flow directly impacts the membrane filament surface of the membrane filament assembly, so that the membrane filament vibrates at a high frequency, thereby shaking off the sludge on the membrane filament. In addition, the sodium hypochlorite solution can oxidize and decompose the organic pollutants and microorganisms on the surface of the membrane filament assembly, thereby reducing the organic pollution on the surface of the membrane filament assembly, killing the microorganisms on the membrane surface and preventing the formation of biofilm on the membrane surface, and further reducing the pollution of the membrane. The flushing time of the first spray head can be controlled to be 15-20 minutes.

[0010] The above technical scheme. Through the physical and chemical synergistic effect of high-pressure water flow stripping + sodium hypochlorite oxidation, the cleaning effect of 1+1>2 can be realized, the cleaning efficiency of the membrane filament assembly is greatly improved, the step of manually cleaning the membrane filament assembly regularly can be omitted, and the labor consumption can be reduced. Moreover, the dissolved oxygen content in the membrane tank is reduced, which is beneficial to improving the biological phosphorus removal efficiency and reducing the consumption of phosphorus removal agent.

[0011] Preferably, the flushing system further comprises a first branch pipe, a second branch pipe and a plurality of second spray heads, the inlet ends of the first branch pipe and the second branch pipe are in communication with the outlet end of the reclaimed water pipeline; the water outlets of the first spray heads and the second spray heads are in communication with the first branch pipe and the second branch pipe respectively, the second spray heads are located in the inner cavity of the membrane tank, the first spray heads and the second spray heads are located on the opposite sides of the membrane rack respectively and the water outlets of the first spray heads and the second spray heads are both directed towards the membrane rack. The high-pressure sodium hypochlorite solution is sprayed out of the first spray heads and the second spray heads at the same time to form water flow on the two sides of the membrane rack respectively, which can make the stress of the membrane assembly and the distribution of the sodium hypochlorite solution more uniform, reduce the membrane pollution residues caused by insufficient local cleaning, and thus improve the overall cleaning effect.

[0012] Preferably, the first branch pipe is provided with a first pressure regulating valve and a first pressure transmitter, and the second branch pipe is provided with a second pressure regulating valve and a second pressure transmitter. The first pressure transmitter can monitor the liquid pressure in the first branch pipe, and when the liquid pressure in the first branch pipe is not within the set range, the opening size of the first pressure regulating valve is adjusted at this time to adjust the pressure inside the first branch pipe, so that the water outlet pressure of the first spray head is within a safe and effective range. The functions of the second pressure regulating valve and the second pressure transmitter are the same as those of the first pressure regulating valve and the first pressure transmitter respectively, and thus will not be described again.

[0013] Preferably, the flushing system further comprises a stress sensor and a vibration sensor, the vibration sensor is arranged in the inner cavity of the membrane tank, and the stress sensor is installed on the membrane rack. The vibration sensor is used to monitor the vibration frequency of the water flow in the membrane tank, so as to simulate the vibration frequency of the membrane filament assembly. The stress sensor on the membrane rack is used to detect the impact force of the water flow, so as to simulate the impact force received by the membrane filament assembly. Before judging whether the pressures of the first pressure transmitter and the second pressure transmitter are within a safe range, it is first judged whether the vibration frequency measured by the vibration sensor or the stress measured by the stress sensor is within a set range, and if so, it is then continued to judge whether the value measured by the first pressure transmitter or the second pressure transmitter is within a safe range, otherwise the frequency of the booster pump is reduced or increased at a speed of 1HZ / minute until the measurement values of the vibration sensor and the stress sensor are within a safe range, so as to avoid the breakage of the membrane filament assembly.

[0014] Preferably, the first branch pipe is provided with a first longitudinal pipe, at least part of the first spray heads are mounted on the first longitudinal pipe and are linearly distributed along the axis direction of the first longitudinal pipe, and the water outlets of the first spray heads are communicated with the first longitudinal pipe; the second branch pipe is provided with a second longitudinal pipe, at least part of the second spray heads are mounted on the second longitudinal pipe and are linearly distributed along the axis direction of the second longitudinal pipe, and the water outlets of the second spray heads are communicated with the second longitudinal pipe; the stress sensors are provided with at least two, and at least one stress sensor is mounted on each side of the membrane rack close to the first spray heads and the second spray heads. The multiple first spray heads and the multiple second spray heads are respectively distributed in the height direction of the membrane rack, so that the stress of the membrane filament assembly and the distribution of sodium hypochlorite in the membrane pool are more uniform, and the blind area of cleaning is avoided. The stress sensors are mounted on both sides of the membrane rack, so that the overall stress of the membrane filament assembly can be simulated and measured, and the local cleaning deficiency or local damage of the membrane filament assembly caused by one-side measurement is avoided.

[0015] Preferably, the membrane rack is provided with multiple and is linearly distributed in the inner cavity of the membrane pool, the first longitudinal pipe and the second longitudinal pipe are both provided with multiple and are both arranged one-to-one with the membrane rack, the first longitudinal pipe and the second longitudinal pipe are both distributed along the distribution direction of the membrane rack, the first longitudinal pipe is linearly distributed with multiple first spray heads, and the second longitudinal pipe is linearly distributed with multiple second spray heads; the vibration sensors are provided with multiple and are distributed along the distribution direction of the membrane rack. The multiple membrane racks arranged in the inner cavity of the membrane pool are beneficial to improve the water treatment efficiency.

[0016] Preferably, the first spray heads and the second spray heads are respectively threadedly connected with the first longitudinal pipe and the second longitudinal pipe. The threaded connection is relatively simple, convenient to disassemble and assemble, and can make the first spray heads and the second spray heads be stably fixed on the first longitudinal pipe and the second longitudinal pipe respectively, so as to avoid loosening caused by high-pressure water flow impact.

[0017] Preferably, the first spray head is provided with a first flared portion, the caliber of one side of the first flared portion close to the membrane rack is larger than that of the other side; the second spray head is provided with a second flared portion, and the caliber of one side of the second flared portion close to the membrane rack is larger than that of the other side. The ordinary straight cylinder spray head is easy to form concentrated jet flow, which causes the local overload (damage risk) of the membrane filament and the cleaning deficiency of other areas. The first flared portion and the second flared portion can make the water flow be conical scattering, which is beneficial to increase the coverage area of the water flow and reduce the risk of local damage of the membrane filament and cleaning deficiency of other areas.

[0018] Preferably, the dosing pipe is provided with a flow regulating valve. The flow regulating valve can adjust the flow of sodium hypochlorite, so as to adjust the pump-out amount of sodium hypochlorite.

[0019] Preferably, the first check valve is arranged on the reclaimed water pipeline, and the second check valve is arranged on the dosing pipeline.

[0020] Preferably, the system further comprises an anaerobic tank, an anoxic tank, an aerobic tank, a post-anoxic tank, an influent channel, an effluent channel, a first reflux pipeline, a first reflux pump, a second reflux pipeline and a second reflux pump, the anaerobic tank, the anoxic tank, the aerobic tank, the post-anoxic tank, the influent channel, the membrane tank and the effluent channel are sequentially connected; the first reflux pump is arranged on the first reflux pipeline, the influent end of the first reflux pipeline is connected with the effluent channel, and the effluent end of the first reflux pipeline is connected with the anaerobic tank; the second reflux pump is arranged on the second reflux pipeline, the influent end of the second reflux pipeline is connected with the aerobic tank, and the effluent end of the second reflux pipeline is connected with the anoxic tank. It should be noted that the anaerobic tank, the anoxic tank, the aerobic tank, the post-anoxic tank, the influent channel, the effluent channel and the membrane tank are all prior art, and their working processes and principles will not be described in detail. In the prior membrane tank water treatment system provided with an aeration flushing system, the sludge in the membrane tank has a high oxygen content, and therefore three reflux channels are required in the entire water treatment system. One of the three reflux channels is used to return the sludge in the effluent channel to the aerobic tank, another one is used to return the sludge in the post-anoxic tank to the anaerobic tank, and the last one is used to return the sludge in the aerobic tank to the anoxic tank. After the aeration flushing system is cancelled in the present application, the oxygen content of the sludge in the membrane tank is reduced, and therefore only two reflux channels are required. One of the two reflux channels (i.e. the first reflux channel) is used to directly return the sludge in the effluent channel to the anaerobic tank, and the other one (i.e. the second reflux channel) is used to return the sludge in the aerobic tank to the anoxic tank. By cutting off one reflux channel and adjusting the reflux path of one of the remaining reflux channels, a short-range material circulation of "membrane tank-anaerobic tank" is constructed, the membrane tank reflux ratio is optimized from the traditional 400%-500% to 50%-100%, the system energy consumption is reduced, and the biological phosphorus removal efficiency is effectively improved.

[0021] The present application has the following advantages:

[0022] 1. The traditional aeration flushing system is cancelled, and a physical-chemical cooperative cleaning mode of high-pressure water flow stripping+chemical oxidation is adopted, so that the cleaning efficiency of the membrane filament assembly can be greatly improved, the step of manual cleaning is saved, and the labor consumption is reduced. Moreover, the dissolved oxygen content of the sewage in the membrane tank is reduced, the biological phosphorus removal efficiency is improved, and the consumption of phosphorus removal agent is reduced.

[0023] 2, set stress sensor and vibration sensor analog measurement membrane silk assembly received impact force and membrane silk assembly vibration frequency, according to the measured value dynamic adjustment pressure regulating valve and booster pump operating parameters, can make membrane silk assembly stress and vibration frequency in the safe range, avoid membrane silk rupture; At the same time, set pressure transmitter analog measurement nozzle water pressure, according to the measured value dynamic adjustment pressure regulating valve operating parameters, can make the nozzle water pressure in the safe and effective range.

[0024] 3, the nozzle is provided with flared part, can make water flow present conical scattering, is favorable for increasing the coverage area of water flow, reduces the risk of membrane silk local damage and other area cleaning deficiency.

[0025] 4, cut off a section of backflow channel, by constructing "membrane pool-anaerobic" short-range material circulation, can optimize membrane pool backflow ratio from traditional 400%-500% to 50%-100%, reduce system energy consumption, while effectively improving biological phosphorus removal efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a high-pressure flushing type water treatment system, and the arrow direction in the figure is the flow direction of liquid or sludge;

[0027] Figure 2 It is a structural schematic diagram of a high-pressure flushing type water treatment system in the perspective of top view, and the arrow direction in the figure is the flow direction of liquid;

[0028] Figure 3 It is a distribution schematic diagram of the first nozzle on the first longitudinal pipe;

[0029] Figure 4 It is a sectional view of the first nozzle;

[0030] Figure 5 It is a backflow schematic diagram of the first backflow pipe and the second backflow pipe, and the arrow direction in the figure is the flow direction of sludge.

[0031] In the drawings: 1-membrane pool; 2-membrane frame; 3-dosing pipe; 4-dosing tank; 5-dosing pump; 6-gray water pipe; 7-pipe mixer; 8-boosting pump; 9-first nozzle; 901-first flared part; 10-first branch pipe; 11-first pressure regulating valve; 12-first pressure transmitter; 13-second pressure regulating valve; 14-second pressure transmitter; 15-stress sensor; 16-vibration sensor; 17-first longitudinal pipe; 18-flow regulating valve; 19-first check valve; 20-second check valve; 21-anaerobic tank; 22-anoxic tank; 23-aerobic tank; 24-post-anoxic tank; 25-influent channel; 26-effluent channel; 27-first backflow pipe; 28-first backflow pump; 29-second backflow pipe; 30-second backflow pump; 31-PLC controller; 32-second branch pipe. DETAILED DESCRIPTION

[0032] The accompanying drawings are only intended to illustrate the present application, and should not be construed as limiting the present application; in order to better illustrate the present application, some components in the drawings can be omitted, enlarged or reduced, and do not represent the actual size of the product; it is understandable for those skilled in the art that some well-known structures and their descriptions in the drawings can be omitted. The positional relationship described in the drawings is only intended to illustrate the present application, and should not be construed as limiting the present application.

[0033] The same or similar reference numerals in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it should be understood that if the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "long" and "short" is based on the orientation or positional relationship shown in the drawings, it is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore the terms describing the positional relationship in the drawings are only intended to illustrate the present application, and should not be construed as limiting the present application, and for those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0034] The technical scheme of the present application will be further described in detail below through specific embodiments and in combination with the drawings:

[0035] Embodiment 1

[0036] The present embodiment is a first embodiment of a high-pressure flushing type water treatment system, which is combined with Figures 1 to 3 As shown in the drawings, it comprises a membrane tank 1 and a flushing system, the membrane tank 1 is provided with a membrane rack 2, and the membrane rack 2 is provided with a membrane filament assembly (not shown in the drawings); the flushing system comprises a PLC controller 31, a dosing pipe 3, a dosing tank 4, a dosing pump 5, a reclaimed water pipe 6, a pipe mixer 7, a booster pump 8 and a plurality of first spray heads 9, the inlet end of the dosing pipe 3 is communicated with the dosing tank 4, the dosing pump 5 is arranged on the dosing pipe 3, and the outlet end of the dosing pipe 3 is communicated with the reclaimed water pipe 6; the pipe mixer 7 and the booster pump 8 are both arranged on the reclaimed water pipe 6, and the pipe mixer 7 is located between the outlet end of the dosing pipe 3 and the booster pump 8; the booster pump 8 is signal connected with the PLC controller 31; the first spray heads 9 are all located in the inner cavity of the membrane tank 1, and the water outlets of the first spray heads 9 are all communicated with the outlet end of the reclaimed water pipe 6.

[0037] It should be noted that the structure and working principle of the membrane rack 2 and the membrane filament assembly are both prior art, and the present embodiment will not be described in detail.

[0038] Further, the flushing system further comprises a first branch pipe 10, a second branch pipe 32 (the specific structure referring to the first branch pipe 10), and a plurality of second spray heads, the inlet ends of the first branch pipe 10 and the second branch pipe 32 are communicated with the outlet end of the reclaimed water pipeline 6; the water outlets of the first spray head 9 and the second spray head are communicated with the first branch pipe 10 and the second branch pipe 32 respectively, and the second spray heads are located in the inner cavity of the membrane tank 1, the first spray head 9 and the second spray head are located on the opposite sides of the membrane rack 2 respectively, and the outlets of the first spray head 9 and the second spray head are all directed to the membrane rack 2. The first spray head 9 and the second spray head spray out high-pressure sodium hypochlorite solution at the same time to form water flow on the two sides of the membrane rack 2 respectively, which can make the stress of the membrane assembly and the distribution of the sodium hypochlorite solution more uniform, reduce the membrane pollution residues caused by insufficient local cleaning, and thus improve the overall cleaning effect.

[0039] Further, the dosing pipeline 3 is provided with a flow regulating valve 18, and the flow regulating valve 18 is signal connected with the PLC controller 31. The flow regulating valve 18 can regulate the flow of sodium hypochlorite, so as to adjust the pump-out amount of sodium hypochlorite.

[0040] Further, the reclaimed water pipeline 6 is provided with a first check valve 19, and the dosing pipeline 3 is provided with a second check valve 20. The first check valve 19 can avoid the backflow of sodium hypochlorite solution in the pipeline mixer 7, and the second check valve 20 can avoid the backflow of sodium hypochlorite on the dosing pipeline 3, which is beneficial to improve the safety of system operation.

[0041] The working principle or working process of the embodiment is as follows: the dosing tank 4 can store sodium hypochlorite or other oxidizing cleaning agents, and the cleaning agent stored in the dosing tank 4 in the embodiment is sodium hypochlorite. After the membrane filament assembly in the membrane tank 1 operates for a period of time, the PLC controller 31 controls to open the dosing pump 5 to pump the sodium hypochlorite in the dosing tank 4 into the pipeline mixer 7, and at the same time, the reclaimed water pipeline 6 delivers clean water into the pipeline mixer 7 to mix the sodium hypochlorite with the clean water in a certain proportion. Then the PLC controller 31 controls to open the booster pump 8 to pressurize the sodium hypochlorite solution in the pipeline mixer 7, and then the sodium hypochlorite solution is injected into the inner cavity of the membrane tank 1 in the form of high-pressure jet through the first spray head 9. After the sodium hypochlorite solution is injected into the inner cavity of the membrane tank 1, high-speed turbulent flow is formed in the sewage, and the water flow directly impacts the membrane filament surface of the membrane filament assembly to make the membrane filament vibrate at a high frequency, thereby shaking off the sludge on the membrane filament. In addition, the sodium hypochlorite solution can oxidize and decompose the organic pollutants and microorganisms on the surface of the membrane filament assembly, thereby reducing the organic pollution on the surface of the membrane filament assembly, killing the microorganisms on the membrane surface, preventing the formation of biofilm on the membrane surface, and further reducing the pollution of the membrane. In the embodiment, the flushing time of the first spray head 9 and the second spray head is controlled to be 15 minutes.

[0042] The beneficial effects of the embodiment: cancel the traditional aeration flushing system, using high pressure water flow stripping + chemical oxidation of physical and chemical cleaning methods, can greatly improve the cleaning efficiency of membrane module, save the step of manual cleaning regularly, reduce the consumption of manpower. And because the dissolved oxygen content of sewage in the membrane pool is reduced, it is beneficial to improve the biological phosphorus removal efficiency and reduce the consumption of phosphorus removal agent.

[0043] Embodiment 2

[0044] The second embodiment of the high-pressure flushing type water treatment system, the embodiment is similar to embodiment 1, the difference is that, as shown in Figure 1 and Figure 2 The first branch pipe 10 is provided with a first pressure regulating valve 11 and a first pressure transmitter 12, and the second branch pipe 32 is provided with a second pressure regulating valve 13 and a second pressure transmitter 14. The first pressure regulating valve 11, the first pressure transmitter 12, the second pressure regulating valve 13 and the second pressure transmitter 14 are all signal connected with the PLC controller 31. The first pressure transmitter 12 can monitor the liquid pressure in the first branch pipe 10. When the liquid pressure in the first branch pipe 10 is not in the set range, the PLC controller 31 controls the opening size of the first pressure regulating valve 11 to adjust the pressure inside the first branch pipe 10, so that the water pressure of the first spray head 9 is in a safe and effective range. The functions of the second pressure regulating valve 13 and the second pressure transmitter 14 are the same as those of the first pressure regulating valve 11 and the first pressure transmitter 12 respectively, so they will not be described again.

[0045] Further, the flushing system further comprises a stress sensor 15 and a vibration sensor 16. The vibration sensor 16 is arranged in the inner cavity of the membrane tank 1 and is signal connected with the PLC controller 31. The stress sensor 15 is installed on the membrane frame 2 and is signal connected with the PLC controller 31. The vibration sensor 16 is used to monitor the vibration frequency of the water flow in the membrane tank 1, so as to simulate the vibration frequency of the membrane module. The stress sensor 15 is used to detect the impact force of the water flow on the membrane frame 2, so as to simulate the impact force received by the membrane module. Before judging whether the pressures of the first pressure transmitter 12 and the second pressure transmitter 14 are in the safe range, the PLC controller 31 first judges whether the vibration frequency measured by the vibration sensor 16 or the stress measured by the stress sensor 15 is in the set range. If yes, continue to judge whether the values measured by the first pressure transmitter 12 or the second pressure transmitter 14 are in the safe range, otherwise control the frequency of the booster pump 8 to decrease or increase at a speed of 1HZ / minute until the measured values of the vibration sensor 16 and the stress sensor 15 are in the safe range, so as to avoid the breakage of the membrane module.

[0046] Further, in combination with Figures 1 to 3As shown, the first branch pipe 10 is provided with a first longitudinal pipe 17, and a part of the first spray heads 9 are installed on the first longitudinal pipe 17 and linearly distributed along the axis direction of the first longitudinal pipe 17, and the water outlets of the first spray heads 9 are communicated with the first longitudinal pipe 17; the second branch pipe 32 is provided with a second longitudinal pipe (the structure can refer to the first longitudinal pipe 17), and a part of the second spray heads are installed on the second longitudinal pipe and linearly distributed along the axis direction of the second longitudinal pipe, and the water outlets of the second spray heads are communicated with the second longitudinal pipe; and a stress sensor 15 is installed on one side of the membrane rack 2 close to the first spray heads 9 and one side close to the second spray heads respectively. The plurality of first spray heads 9 and the plurality of second spray heads are respectively distributed in the height direction of the membrane rack 2, so that the stress of the membrane filament assembly and the distribution of sodium hypochlorite in the membrane pool 1 are more uniform, and blind cleaning area is avoided. The stress sensor 15 installed on both sides of the membrane rack 2 can simulate the overall stress of the membrane filament assembly, and avoid local cleaning deficiency or local damage of the membrane filament assembly caused by one-side measurement.

[0047] Further, the membrane rack 2 is provided with a plurality of and linearly distributed in the inner cavity of the membrane pool 1, the first longitudinal pipe 17 and the second longitudinal pipe are both provided with a plurality of and correspondingly arranged with the membrane rack 2, that is, one first longitudinal pipe 17 and one second longitudinal pipe correspond to one membrane rack 2, and the first longitudinal pipe 17 and the second longitudinal pipe are both distributed along the distribution direction of the membrane rack 2, the first longitudinal pipe 17 is linearly distributed with a plurality of first spray heads 9, and the second longitudinal pipe is linearly distributed with a plurality of second spray heads; the vibration sensor 16 is provided with a plurality of and distributed along the distribution direction of the membrane rack 2. The plurality of membrane racks 2 arranged in the inner cavity of the membrane pool 1 are beneficial to improve the water treatment efficiency.

[0048] The other features, working principles and beneficial effects of the embodiment are consistent with those of embodiment 1.

[0049] Embodiment 3

[0050] The third embodiment of the high-pressure flushing type water treatment system, which is similar to embodiment 2, differs from embodiment 2 in that, as shown, Figure 4 The first spray head 9 and the second spray head (the structure can refer to the first spray head) are both provided with external threads, and the first spray head 9 and the second spray head are respectively threadedly connected with the first longitudinal pipe 17 and the second longitudinal pipe through the external threads thereof. The threaded connection is relatively simple, convenient to disassemble and assemble, and can make the first spray head 9 and the second spray head respectively stable on the first longitudinal pipe 17 and the second longitudinal pipe, avoiding loosening caused by high-pressure water flow impact.

[0051] Further, the first nozzle 9 is provided with a first flared portion 901 at the water outlet, the diameter of the first flared portion 901 near the membrane frame 2 is larger than that of the other side, and the taper angle of the first flared portion 901 is 45°; the second nozzle has the same structure as the first nozzle 9, and the second nozzle is provided with a second flared portion at the water outlet, the diameter of the second flared portion near the membrane frame 2 is larger than that of the other side. The ordinary straight cylinder nozzle is easy to form concentrated jet flow, which causes local overload (damage risk) of the membrane filaments and insufficient cleaning of other areas, and the setting of the first flared portion 901 and the second flared portion can make the water flow be conical scattering, which is beneficial to increase the coverage area of the water flow and reduce the risk of local damage of the membrane filaments and insufficient cleaning of other areas.

[0052] Further, as shown in Figure 5 the system further comprises an anaerobic tank 21, an anoxic tank 22, an aerobic tank 23, a post-anoxic tank 24, an inlet water channel 25, an outlet water channel 26, a first reflux pipeline 27, a first reflux pump 28, a second reflux pipeline 29 and a second reflux pump 30, the anaerobic tank 21, the anoxic tank 22, the aerobic tank 23, the post-anoxic tank 24, the inlet water channel 25, the membrane tank 1 and the outlet water channel 26 are sequentially communicated; the first reflux pump 28 is arranged on the first reflux pipeline 27, the water inlet end of the first reflux pipeline 27 is communicated with the outlet water channel 26, and the water outlet end of the first reflux pipeline 27 is communicated with the anaerobic tank 21; the second reflux pump 30 is arranged on the second reflux pipeline 29, the water inlet end of the second reflux pipeline 29 is communicated with the aerobic tank 23, and the water outlet end of the second reflux pipeline 29 is communicated with the anoxic tank 22. It should be noted that the anaerobic tank 21, the anoxic tank 22, the aerobic tank 23, the post-anoxic tank 24, the inlet water channel 25, the outlet water channel 26 and the membrane tank 1 are all prior art, and their working processes and working principles will not be described in detail here. In the existing membrane tank 1 water treatment system provided with an aeration flushing system, due to the high oxygen content of the sludge in the membrane tank 1, three reflux channels need to be arranged in the entire water treatment system. One of them sends the sludge in the outlet water channel 26 back to the aerobic tank 23, another one sends the sludge in the post-anoxic tank 24 back to the anaerobic tank 21, and the last one sends the sludge in the aerobic tank 23 back to the anoxic tank 22. The present application cancels the aeration flushing system, and due to the reduction of the oxygen content of the sludge in the membrane tank 1, only two reflux channels need to be arranged, one of which (i.e. the first reflux channel) directly sends the sludge in the outlet water channel 26 back to the anaerobic tank 21, and the other one (i.e. the second reflux channel) sends the sludge in the aerobic tank 23 back to the anoxic tank 22. By reducing one reflux channel and adjusting the reflux path of one of the reflux channels, a short-range material cycle of "membrane tank-anaerobic tank" is constructed, the membrane tank reflux ratio can be optimized from the traditional 400%-500% to 50%-100%, the system energy consumption is reduced, and the biological phosphorus removal efficiency is effectively improved.

[0053] The other features, working principles and beneficial effects of the present embodiment are consistent with those of embodiment 2.

[0054] In the specific contents of the above specific embodiments, each technical feature can be combined arbitrarily without contradiction, and in order to make the description simple, all possible combinations of the above technical features are not described, however, as long as the combination of the technical features does not exist contradiction, it should be considered as the scope of the description.

[0055] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For ordinary skilled in the art, on the basis of the above description, other different forms of changes or variations can be made, here, all the embodiments need not and cannot be exhausted. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A high-pressure flushing water treatment system, comprising a membrane tank (1) and a flushing system, wherein a membrane frame (2) is provided inside the membrane tank (1), and a membrane fiber assembly is provided on the membrane frame (2), characterized in that, The flushing system includes a dosing pipe (3), a dosing tank (4), a dosing pump (5), a greywater pipe (6), a pipe mixer (7), a booster pump (8), and multiple first nozzles (9). The inlet end of the dosing pipe (3) is connected to the dosing tank (4). The dosing pump (5) is installed on the dosing pipe (3), and the outlet end of the dosing pipe (3) is connected to the greywater pipe (6). The pipe mixer (7) and the booster pump (8) are both installed on the greywater pipe (6). The pipe mixer (7) is located between the outlet end of the dosing pipe (3) and the booster pump (8). The first nozzles (9) are all located inside the membrane tank (1), and the outlet of each first nozzle (9) is connected to the outlet end of the greywater pipe (6).

2. The high-pressure flushing water treatment system according to claim 1, characterized in that, The flushing system also includes a first branch pipe (10), a second branch pipe (32), and a plurality of second nozzles. The inlet ends of the first branch pipe (10) and the second branch pipe (32) are connected to the outlet end of the greywater pipe (6). The outlets of the first nozzle (9) and the second nozzle are connected to the first branch pipe (10) and the second branch pipe (32), respectively. The second nozzles are all located inside the membrane tank (1). The first nozzle (9) and the second nozzle are located on opposite sides of the membrane frame (2), and the outlets of the first nozzle (9) and the second nozzle are all facing the membrane frame (2).

3. The high-pressure flushing water treatment system according to claim 2, characterized in that, The first branch pipe (10) is provided with a first pressure regulating valve (11) and a first pressure transmitter (12), and the second branch pipe (32) is provided with a second pressure regulating valve (13) and a second pressure transmitter (14).

4. The high-pressure flushing water treatment system according to claim 3, characterized in that, The flushing system also includes a stress sensor (15) and a vibration sensor (16). The vibration sensor (16) is disposed inside the inner cavity of the membrane tank (1), and the stress sensor (15) is mounted on the membrane frame (2).

5. A high-pressure flushing water treatment system according to claim 4, characterized in that, The first branch pipe (10) is provided with a first longitudinal pipe (17), and at least a portion of the first nozzles (9) are installed on the first longitudinal pipe (17) and are distributed in a straight line along the axial direction of the first longitudinal pipe (17). The outlet of the first nozzle (9) is connected to the first longitudinal pipe (17). The second branch pipe (32) is provided with a second longitudinal pipe, and at least a portion of the second nozzles are installed on the second longitudinal pipe and are distributed in a straight line along the axial direction of the second longitudinal pipe. The outlet of the second nozzle is connected to the second longitudinal pipe. At least two stress sensors (15) are provided, and at least one stress sensor (15) is installed on the side of the membrane frame (2) near the first nozzle (9) and the side near the second nozzle, respectively.

6. A high-pressure flushing water treatment system according to claim 5, characterized in that, The membrane frame (2) is provided in multiple and is linearly distributed in the inner cavity of the membrane pool (1). The first longitudinal tube (17) and the second longitudinal tube are provided in multiple and are arranged one-to-one with the membrane frame (2). The first longitudinal tube (17) and the second longitudinal tube are distributed along the distribution direction of the membrane frame (2). The first longitudinal tube (17) is provided with multiple first nozzles (9) linearly distributed, and the second longitudinal tube is provided with multiple second nozzles linearly distributed. The vibration sensor (16) is provided in multiple and is distributed along the distribution direction of the membrane frame (2).

7. A high-pressure flushing water treatment system according to claim 5, characterized in that, The first nozzle (9) has a first flared section (901) at its outlet, and the diameter of the first flared section (901) on the side closer to the membrane frame (2) is larger than the diameter on the other side; the second nozzle has a second flared section at its outlet, and the diameter of the second flared section on the side closer to the membrane frame (2) is larger than the diameter on the other side.

8. A high-pressure flushing water treatment system according to claim 1, characterized in that, The dosing pipeline (3) is equipped with a flow regulating valve (18).

9. A high-pressure flushing water treatment system according to claim 1, characterized in that, The greywater pipeline (6) is equipped with a first check valve (19), and the chemical dosing pipeline (3) is equipped with a second check valve (20).

10. A high-pressure flushing water treatment system according to any one of claims 1 to 9, characterized in that, It also includes an anaerobic tank (21), an anoxic tank (22), an aerobic tank (23), a post-anoxic tank (24), an inlet channel (25), an outlet channel (26), a first return pipe (27), a first return pump (28), a second return pipe (29), and a second return pump (30). The anaerobic tank (21), anoxic tank (22), aerobic tank (23), post-anoxic tank (24), inlet channel (25), membrane tank (1), and outlet channel (26) are connected in sequence. (28) is installed on the first return pipe (27), the inlet end of the first return pipe (27) is connected to the outlet channel (26), and the outlet end of the first return pipe (27) is connected to the anaerobic tank (21); the second return pump (30) is installed on the second return pipe (29), the inlet end of the second return pipe (29) is connected to the aerobic tank (23), and the outlet end of the second return pipe (29) is connected to the anoxic tank (22).

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