CN118771586A - An MBR membrane blockage pollution treatment system for sewage treatment - Google Patents
An MBR membrane blockage pollution treatment system for sewage treatment Download PDFInfo
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- CN118771586A CN118771586A CN202310355511.4A CN202310355511A CN118771586A CN 118771586 A CN118771586 A CN 118771586A CN 202310355511 A CN202310355511 A CN 202310355511A CN 118771586 A CN118771586 A CN 118771586A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
本发明属于曝气池污水处理技术领域，具体公开了一种用于污水处理的MBR膜堵塞污染处理系统，包括压力检测机构、控制机构和除污机构，所述压力检测机构用于检测MBR膜进口和出口的水压，所述控制机构用于判断检测的MBR膜进口和出口的水压差变化并输出控制信号控制除污机构动作；所述除污机构包括气吹水喷清扫单元、工业水反冲洗单元和化学清洗单元。本发明能够替代目前依靠人工清洗的除污方式，提高除污作业效率。
The present invention belongs to the technical field of aeration tank sewage treatment, and specifically discloses an MBR membrane blockage pollution treatment system for sewage treatment, including a pressure detection mechanism, a control mechanism and a decontamination mechanism, wherein the pressure detection mechanism is used to detect the water pressure at the inlet and outlet of the MBR membrane, and the control mechanism is used to judge the change of the water pressure difference between the inlet and outlet of the MBR membrane detected and output a control signal to control the action of the decontamination mechanism; the decontamination mechanism includes an air-blowing and water-spraying cleaning unit, an industrial water backwashing unit and a chemical cleaning unit. The present invention can replace the current decontamination method relying on manual cleaning and improve the efficiency of decontamination operations.
Description
Technical Field
The invention relates to the technical field of sewage treatment of aeration tanks, in particular to an MBR membrane blocking pollution treatment system for sewage treatment.
Background
The sewage biochemical treatment process of 'air flotation-hydrolytic acidification-A/O-MBR membrane' is adopted, an MBR membrane module unit (0.1 μm) is a novel efficient sewage treatment and recycling process which is formed by combining a high-efficiency separation technology of a membrane with biodegradation, a secondary sedimentation tank is replaced, all suspended matters and colloids are separated and trapped by the membrane, the concentration of activated sludge in an aeration tank is increased by the membrane separation function, the biodegradation rate is improved, and the discharge amount of residual sludge is reduced.
The MBR membrane component consists of a membrane element box (upper part) and an aeration box (lower part), wherein membrane elements connected with a water collecting pipe through hoses are arranged in the membrane element box, an aeration pipe is arranged in the aeration box, and each membrane element can be independently inserted and extracted, so that maintenance is facilitated.
The core component of the MBR membrane sewage treatment device is a high-performance immersed filter membrane component, and the operating energy consumption is reduced by 10-20 times compared with that of a split filter membrane component adopting a pressurized filter mode because the filter membrane component adopts a negative pressure suction type filter mode, the flat membrane component has a simple structure, and the surface of the filter membrane is not easy to scale and form mud when the filter membrane is mixed and flushed with aeration air flow and sewage during operation, so that the stable operation of the filter membrane in a filter system is ensured.
However, in the actual production and operation process, membrane blockage and pollution problems caused by activated sludge, inlet water impurities and cleaning fans often occur in the MBR membrane module.
Specifically, the problem of membrane clogging and contamination caused by activated sludge is manifested as: due to the low concentration of microorganisms in the activated sludge and the large amount of inorganic salts or inorganic matters, abnormal flora generation (such as filamentous fungus expansion, biological foam and the like) and the possible MBR membrane blockage caused by excessive EPS (extracellular polymeric substances) on the surfaces of microorganisms, the viscosity of extracellular substances in the activated sludge is high, and the EPS change can occur while the water temperature and the water quality change, so that the MBR membrane flux is rapidly reduced.
The membrane blockage and pollution problems caused by the inlet water impurities are expressed as follows: in some sewage plants, small impurities exist in the inlet water due to the fact that a membrane grille is not used or is improperly used, and in addition, in order to rapidly increase the concentration of activated sludge in a biological pond during the cultivation of activated sludge, inoculated sludge is directly added into the biological pond at the front end of an MBR, and the sludge which is not filtered by the membrane grille can cause membrane blockage, and even some sharp objects cause the breakage and fracture of the MBR membrane.
The membrane blockage and pollution problems caused by the cleaning fan are expressed as follows: because the design and the selection of the air blower are unreasonable, the conditions of excessive inflation or insufficient inflation and the like occur in the membrane cleaning process, the sludge on the surface of the MBR membrane is blocked due to the air blower, and in addition, the excessive aeration also easily causes the excessive oxygenation of the activated sludge, so that certain influence can be caused on dephosphorization and denitrification.
The inventor of the application finds that the current mode for treating the problem of MBR membrane blockage pollution is basically to stop the operation of the filtration system and then to perform decontamination by adopting a manual cleaning mode so as to achieve the purposes of high flux, low energy consumption and long service life, but the manual decontamination mode has a series of technical problems of long working time, low operation efficiency and serious influence on the normal operation time of the filtration system.
Disclosure of Invention
The invention provides an MBR membrane blockage pollution treatment system for sewage treatment, and aims to replace the existing manual cleaning mode and improve the efficiency of the sewage removal operation.
The invention is realized by the following technical scheme: the MBR membrane blockage pollution treatment system for sewage treatment is characterized by comprising a pressure detection mechanism, a control mechanism and a pollution removal mechanism, wherein the pressure detection mechanism is used for detecting water pressure of an inlet and an outlet of an MBR membrane, and the control mechanism is used for judging water pressure difference change of the detected inlet and outlet of the MBR membrane and outputting a control signal to control the action of the pollution removal mechanism; the decontamination mechanism comprises an air-blowing water-spraying sweeping unit, an industrial water back-flushing unit and a chemical cleaning unit.
Compared with the prior art, the invention has the following advantages and beneficial effects:
The technical scheme of the invention can replace the existing manual cleaning mode, and the control mechanism can output a control signal according to the water pressure difference change of the inlet and the outlet of the MBR membrane detected by the pressure detection mechanism, so that the automatic control of the pollution removal mechanism to clean and remove the MBR membrane is realized, the technical problems of long working time, low operation efficiency and serious influence on the normal operation time of a filtering system in the existing pollution removal technology are effectively solved, the efficiency of the pollution removal operation is effectively improved, and the serious pollution problem on the surface of the MBR membrane is effectively solved.
Further, the control mechanism presets a first early warning value, a second early warning value and a third early warning value; when the water pressure difference between the inlet and the outlet of the MBR membrane is increased to a first early warning value, the control mechanism outputs a first control signal; when the water pressure difference between the inlet and the outlet of the MBR membrane is increased to a second early warning value, the control mechanism outputs a second control signal; when the water pressure difference between the inlet and the outlet of the MBR membrane is increased to a third early warning value, the control mechanism outputs a third control signal;
The air-blowing water-spraying sweeping unit can perform air aeration sweeping and high-pressure water spraying scouring on the surface of the MBR membrane according to a first control signal output by the control mechanism, the industrial water backwashing unit can perform backwashing on the surface of the MBR membrane according to a second control signal output by the control mechanism, and the chemical cleaning unit can clean the excrement on the surface of the MBR membrane according to a third control signal output by the control mechanism.
The beneficial effects are that: according to the technical scheme, a first control signal is automatically output when the water pressure difference at the inlet and outlet of the MBR membrane is increased to a first early warning value, a second control signal is automatically output when the water pressure difference at the inlet and outlet of the MBR membrane is increased to a second early warning value, a third control signal is automatically output when the water pressure difference at the inlet and outlet of the MBR membrane is increased to a third early warning value, and an air-blowing water-spraying cleaning unit, an industrial water back flushing unit and a chemical cleaning unit in the decontamination mechanism respectively correspond to the first control signal, the second control signal and the third control signal, so that the surface of the MBR membrane is cleaned and decontaminated.
Further, the first early warning value, the second early warning value and the third early warning value are sequentially increased.
The beneficial effects are that: the more serious the MBR membrane pollution is blocked, the larger the corresponding pressure difference is, the cleaning degree of the used cleaning mode is different, and the corresponding decontamination operation can be selected according to the blocking pollution degree of the MBR membrane.
Further, the pressure detection mechanism comprises two pressure transmitters, and the two pressure transmitters are respectively arranged at the inlet and the outlet of the MBR membrane.
The beneficial effects are that: the scheme utilizes a pressure transmitter to detect the water pressure of an inlet and an outlet of an MBR membrane, the control mechanism judges whether the water pressure difference of the inlet and the outlet of the MBR membrane changes.
Further, the control mechanism is a PLC controller or a singlechip.
The beneficial effects are that: by adopting the two control modes, the automatic control of the decontamination action can be realized.
Further, the air-blowing water-spraying cleaning unit comprises an aeration valve, a hollow supporting shaft, a high-pressure air pipeline and a water spray nozzle, wherein the aeration valve is connected with an air inlet of the MBR membrane through the high-pressure air pipeline, the hollow supporting shaft is bridged on two opposite side walls of the aeration tank, the water spray nozzle is connected to the hollow supporting shaft and faces the surface of the MBR membrane, and one end of the hollow supporting shaft is communicated with an external high-pressure water source;
The industrial water backwashing unit comprises a water inlet valve, a backwashing pump, a backwashing valve, a water inlet pipeline, a water outlet pipeline and a suction pump, wherein the water inlet valve, the backwashing pump and the backwashing valve are connected with a water inlet of the MBR membrane through the water inlet pipeline, and the suction pump is connected with a water outlet of the MBR membrane through the water outlet pipeline;
The chemical cleaning unit comprises a switch valve, a chemical cleaning pump, a chemical cleaning pipeline and a chemical cleaning tank, wherein the switch valve and the chemical cleaning pump are connected to the chemical cleaning pipeline, one end of the chemical cleaning pipeline is connected with a water inlet pipeline between the backwash pump and the backwash valve, and the other end of the chemical cleaning pipeline is inserted into the chemical cleaning tank and connected with a branch pipeline communicated with the outside atmosphere.
The beneficial effects are that: the air-blowing water-spraying sweeping unit in the scheme can use a high-pressure water source to carry out air aeration sweeping and high-pressure spraying scouring on the surface of the MBR membrane through the water spray nozzle on the hollow supporting shaft, so that the cleaning force is strong; in the industrial water back flushing unit, external industrial water enters the MBR membrane through a water inlet pipeline, so that a mud cake layer deposited on the surface of the MBR membrane can be removed greatly, the membrane flux is recovered, the treatment effect of the reactor on wastewater cannot be influenced by industrial water back flushing, the flushing effect is good, and the flushed sewage can be discharged through a water outlet pipeline by a suction pump; and the chemical cleaning unit can be used for chemically cleaning the MBR membrane, and the chemical cleaning is more effective when the membrane pollution is lighter, so that the operation of the filtering system is more stable by timely and periodically performing the chemical cleaning.
Further, the water spray nozzles are arranged in a plurality, and the water spray nozzles are sequentially connected to the hollow supporting shaft at intervals.
The beneficial effects are that: the setting of a plurality of water nozzles can improve the washing dynamics and improve cleaning efficiency.
Further, the chemical cleaning unit further comprises a circulating valve, the chemical cleaning pipeline comprises a main cleaning pipeline and a chemical circulating pipeline, the switching valve and the circulating valve are connected to the main cleaning pipeline, one end of the main cleaning pipeline is connected with a water inlet pipeline between the backwash pump and the backwash valve, and the other end of the main cleaning pipeline is inserted into the chemical cleaning tank and connected with a branch pipeline communicated with the outside atmosphere;
One end of the chemical circulation pipeline is connected with the main cleaning pipeline between the switch valve and the circulation valve, the other end of the chemical circulation pipeline is communicated with the chemical cleaning tank, and the chemical cleaning pump is connected to the chemical circulation pipeline.
The beneficial effects are that: according to the scheme, the chemical agents added into the chemical cleaning tank can be recycled in a reciprocating mode through the recycling valve and the chemical recycling pipeline, so that the chemical agents in the chemical cleaning tank can be uniformly mixed, and the chemical cleaning effect in the later stage is improved.
Further, the aeration valve, the water inlet valve, the backwashing valve, the switching valve, the circulating valve, the backwashing pump, the suction pump and the chemical cleaning pump are all electrically connected with the control mechanism.
The beneficial effects are that: in the scheme, the action of each valve and the pump can be automatically controlled through the control mechanism, so that the automatic valve and the pump are more automatic.
Further, the hollow supporting shaft is rotationally connected with two opposite side walls of the aeration tank, a rotating motor is arranged on the outer side of the aeration tank, one end of the hollow supporting shaft is rotationally communicated with an external high-pressure water source, and the other end of the hollow supporting shaft is connected with a motor shaft of the rotating motor.
The beneficial effects are that: the cavity back shaft in this scheme can rotate to can drive the water jet and rotate, like this through the angle that changes the water jet towards the MBR membrane surface, with this can be better realize spraying the washing to the MBR membrane surface.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:
FIG. 1 is a schematic diagram of an embodiment 1 of an MBR membrane fouling treatment system for wastewater treatment according to the present invention;
FIG. 2 is a schematic diagram of an embodiment 1 of an MBR membrane fouling treatment system for wastewater treatment according to the present invention;
Fig. 3 is a schematic structural diagram of an MBR membrane clogging pollution treatment system for sewage treatment according to embodiment 2 of the present invention.
In the drawings, the reference numerals and corresponding part names:
The pressure detection mechanism 1, the control mechanism 2, the decontamination mechanism 3, the air-blown water jet cleaning unit 31, the aeration valve 311, the hollow support shaft 312, the water nozzle 313, the rotating motor 314, the industrial water back flushing unit 32, the water inlet valve 321, the back flushing pump 322, the back flushing valve 323, the suction pump 324, the chemical cleaning unit 33, the on-off valve 331, the circulation valve 332, the chemical cleaning pump 333 and the chemical cleaning tank 334.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
Embodiment 1 as shown in fig. 1-2, embodiment 1 provides an MBR membrane blockage pollution treatment system for sewage treatment, which comprises a pressure detection mechanism 1, a control mechanism 2 and a pollution removal mechanism 3, wherein the pressure detection mechanism 1 is used for detecting water pressure of an MBR membrane inlet and an MBR membrane outlet, and the control mechanism 2 is used for judging whether the water pressure difference of the MBR membrane inlet and the MBR membrane outlet detected by the pressure detection mechanism 1 changes or not and outputting a control signal to control the pollution removal mechanism 3 to act; the decontamination mechanism 3 includes an air-blown water spray cleaning unit 31, an industrial water back-flushing unit 32, and a chemical cleaning unit 33.
The control mechanism 2 presets a first early warning value, a second early warning value and a third early warning value, wherein the first early warning value, the second early warning value and the third early warning value are sequentially increased, and in the embodiment, the first early warning value is 0.2bar, the second early warning value is 0.35bar and the third early warning value is 0.5bar.
When the inlet and outlet water pressure difference of the MBR membrane is increased to a first early warning value, the control mechanism 2 outputs a first control signal; when the water pressure difference between the inlet and the outlet of the MBR membrane is increased to a second early warning value, the control mechanism 2 outputs a second control signal; when the water pressure difference between the inlet and the outlet of the MBR membrane is increased to a third early warning value, the control mechanism 2 outputs a third control signal.
The air-blowing water-spraying sweeping unit 31 can perform air-aeration sweeping and high-pressure water spraying scouring on the surface of the MBR membrane according to a first control signal output by the control mechanism 2, the industrial water backwashing unit 32 can perform backwashing on the surface of the MBR membrane according to a second control signal output by the control mechanism 2, and the chemical cleaning unit 33 can clean the excrement on the surface of the MBR membrane according to a third control signal output by the control mechanism 2.
In this embodiment, the pressure detecting mechanism 1 includes two pressure transmitters (not shown in the figure), the two pressure transmitters are respectively disposed at the inlet and the outlet of the MBR membrane, and the two pressure transmitters are used for detecting the water pressure at the inlet and the outlet of the MBR membrane, and sending the detected water pressure to the control mechanism 2 for judgment.
The control mechanism 2 in this embodiment is implemented by using an existing PLC controller or a single-chip microcomputer, and the specific structure and working principle of the PLC controller or the single-chip microcomputer are well known to those skilled in the art, and are not described herein.
As a specific example, as shown in fig. 2, the air-blown water-jet cleaning unit 31 includes an aeration valve 311, a hollow support shaft 312, a high-pressure air line, and a water jet 313, where the aeration valve 311 is connected to an air inlet of the MBR membrane through the high-pressure air line, that is, the aeration valve 311 is disposed on the high-pressure air line connected to the air inlet of the MBR membrane; the hollow supporting shaft 312 is bridged on two opposite side walls of the aeration tank, the water spray nozzles 313 are connected on the hollow supporting shaft 312 and face the surface of the MBR membrane, in the embodiment, a plurality of water spray nozzles 313 are arranged, the plurality of water spray nozzles 313 are sequentially connected on the hollow supporting shaft 312 at intervals, the inside of the hollow supporting shaft 312 is hollow, the water spray nozzles 313 are communicated with the hollow supporting shaft 312, and one end of the hollow supporting shaft 312 is communicated with an external high-pressure water source; further, in another embodiment, the two opposite side walls of the hollow supporting shaft 312 and the aeration tank are rotatably connected through bearings, a rotating motor 314 is arranged outside the aeration tank, a bracket (not shown in the figure) for supporting and fixing the rotating motor 314 is arranged outside the aeration tank, one end of the hollow supporting shaft 312 is rotatably communicated with an external high-pressure water source through a rotating component such as a bearing, and the other end of the hollow supporting shaft 312 is fixedly connected with a motor shaft of the rotating motor 314 through a coupling, so that when the rotating motor 314 rotates, the hollow supporting shaft 312 can be driven to rotate through the motor shaft, and then a water spray nozzle 313 of the hollow supporting shaft 312 is driven to rotate, so that the angle of the water spray nozzle 313 facing the MBR membrane surface is adjusted, and the water spray scouring on the MBR membrane surface is better realized.
The industrial water back flushing unit 32 comprises a water inlet valve 321, a back flushing pump 322, a back flushing valve 323, a water inlet pipeline, a water outlet pipeline and a suction pump 324, wherein the water inlet valve 321, the back flushing pump 322 and the back flushing valve 323 are connected with a water inlet of the MBR membrane through the water inlet pipeline, in the embodiment, the water inlet valve 321, the back flushing pump 322 and the back flushing valve 323 are sequentially arranged on the water inlet pipeline connected with the water inlet of the MBR membrane, the back flushing valve 323 is arranged closer to the MBR membrane, and the suction pump 324 is connected with a water outlet of the MBR membrane through a water outlet pipeline, namely the suction pump 324 is arranged on the water outlet pipeline connected with the water outlet of the MBR membrane;
The chemical cleaning unit 33 includes a switching valve 331, a chemical cleaning pump 333, a chemical cleaning pipe and a chemical cleaning tank 334, the switching valve 331 and the chemical cleaning pump 333 are connected on the chemical cleaning pipe, one end of the chemical cleaning pipe is connected with a water inlet pipe between the backwash pump 322 and the backwash valve 323, and the other end of the chemical cleaning pipe is inserted into the chemical cleaning tank 334 and connected with a branch pipe communicated with the outside atmosphere.
The control mechanism 2 is electrically connected to the respective pumps and valves, that is, the aeration valve 311, the water inlet valve 321, the backwash valve 323, the on-off valve 331, the backwash pump 322, the suction pump 324 and the chemical cleaning pump 333 in this embodiment are electrically connected to the control mechanism 2.
The specific implementation process is as follows:
As shown in fig. 2, the air-blowing water-spraying cleaning unit 31 is configured to perform air-aeration cleaning and high-pressure water-spraying flushing on the surface of the MBR membrane according to the first control signal output by the control mechanism 2, and specifically includes: opening the aeration valve 311, increasing the blowing air volume in the high-pressure air pipeline, and simultaneously opening an external high-pressure water source, wherein high-pressure water flows through the inside of the hollow support shaft 312 and is sprayed out by each water spray nozzle 313 at high pressure, so that intelligent blocking removal treatment of the MBR membrane is realized.
The industrial water back-flushing unit 32 is configured to back-flush the surface of the MBR membrane according to a second control signal output by the control mechanism 2, and specifically includes: the water inlet valve 321, the backwash pump 322, the backwash valve 323 and the suction pump 324 are opened, external industrial water enters the MBR membrane through the water inlet pipeline, a mud cake layer deposited on the surface of the MBR membrane can be removed greatly, membrane flux is recovered, the treatment effect of the reactor on wastewater cannot be influenced by industrial water backwash, the flushing effect is good, and the flushed sewage can be discharged through the water outlet pipeline by the suction pump 324.
The chemical cleaning unit 33 is configured to clean the MBR membrane surface excrement according to the third control signal output by the control mechanism 2, and specifically includes the following steps:
S1, closing a switch valve 331, and stopping the chemical cleaning pump 333;
s2, respectively preparing citric acid and hydrochloric acid chemical agents with pH values of 3-6, 30% sodium hydroxide solution by mass percent and 10% sodium hypochlorite solution by mass percent;
S3, stopping the operation of the filtering system;
s4, mixing citric acid and hydrochloric acid chemical agents with the pH value of 3-6 in the chemical cleaning tank 334;
S5, opening a switch valve 331, starting a chemical cleaning pump 333, determining the standard liquid inlet amount of chemical agents, and then injecting citric acid and hydrochloric acid chemical agents with pH value of 3-6 into the polluted MBR membrane module for cleaning, wherein the injection time is preferably 1-2 hours, and the cleaning time can be detected to be increased properly when cleaning excrement;
S6, stopping the chemical cleaning pump 333 and closing the switch valve 331 when the chemical agent in the chemical cleaning tank 334 is confirmed to be added;
S7, repeating the steps S4-S6, and sequentially completing injection cleaning of 30% by mass of sodium hydroxide chemical agent and 10% by mass of sodium hypochlorite chemical agent, namely cleaning the MBR membrane component sequentially through a citric acid hydrochloric acid chemical agent, a sodium hydroxide chemical agent and a sodium hypochlorite chemical agent; wherein, the injection time of the sodium hydroxide chemical agent is preferably 1-2 hours, the cleaning time is increased properly when the excrement is detected to be cleaned, and the sodium hypochlorite chemical agent is injected in a continuous injection mode;
S8, placing for a certain time, wherein the specific time is determined according to the cleaning excrement data;
s9, opening a water inlet valve 321, a backwashing pump 322, a backwashing valve 323 and a suction pump 324, and performing backwashing operation, namely performing backwashing operation again after the three chemical agents are injected and cleaned, so as to clean the residual chemical agents;
s10, starting the filtering system, and restarting normal filtering operation.
The frequency and operating conditions of chemical cleaning are related to the quality of the incoming water, and the filtration system should be usually operated for 1-3 months or the pressure difference across the membrane should be more than 0.5bar higher than the initial rise under the same operating conditions, and chemical cleaning can be performed by manual operation control when the membrane pollution is light (i.e. the pressure difference is less than 0.5 bar), and cleaning is more effective at this time, so the operation of the filtration system is more stable by periodically performing chemical cleaning in time.
Example 2 is different from example 1 in that, as shown in fig. 3: the chemical cleaning unit 33 in this embodiment further includes a circulation valve 332, and the circulation valve 332 is electrically connected to the control mechanism 2.
The chemical cleaning pipeline comprises a main cleaning pipeline and a chemical circulating pipeline, the on-off valve 331 and the circulating valve 332 are connected to the main cleaning pipeline, the circulating valve 332 is positioned at one side closer to the chemical cleaning tank 334, one end of the main cleaning pipeline is connected with a water inlet pipeline between the backwash pump 322 and the backwash valve 323, and the other end of the main cleaning pipeline is inserted into the chemical cleaning tank 334 and connected with a branch pipeline communicated with the outside atmosphere;
One end of the chemical circulation pipeline is connected with the main cleaning pipeline between the switch valve 331 and the circulation valve 332, the other end of the chemical circulation pipeline is communicated with the chemical cleaning tank 334, and the chemical cleaning pump 333 is connected to the chemical circulation pipeline, so that a circulation pipeline is formed, and the chemical agent in the chemical cleaning tank 334 is conveniently circulated, so that the chemical agent is more uniformly mixed.
The specific steps of the chemical cleaning unit 33 for cleaning the surface excrement of the MBR membrane according to the third control signal outputted from the control mechanism 2 in this embodiment are different from those of embodiment 1 in that:
S4, adding citric acid and hydrochloric acid chemical agents with the pH value of 3-6 into the chemical cleaning tank 334, starting the chemical cleaning pump 333, starting the circulating valve 332, and circularly adding the citric acid and hydrochloric acid chemical agents with the pH value of 3-6 into the chemical cleaning tank 334 to fully mix the chemical agents again; in this step, after the chemical cleaning pump 333 and the circulation valve 332 are opened, the chemical agent in the chemical cleaning tank 334 can be reciprocally circulated, so that the chemical agent in the chemical cleaning tank 334 is more uniformly mixed, the chemical agent after the MBR membrane is uniformly mixed is convenient for later injection, and the cleaning effect and the cleaning speed are better.
S5, opening the switch valve 331, closing the circulation valve 332, determining the standard liquid inlet amount of the chemical agent, and then injecting the citric acid and hydrochloric acid chemical agent with the pH value of 3-6 into the polluted MBR membrane module for cleaning, wherein the injection time is preferably 1-2 hours, and the cleaning time can be specifically detected to be properly increased when the cleaning excrement is cleaned.
The remaining steps are the same as those of example 1, and will not be described again.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
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