CN113562942A - Aerobic granular sludge-immersed ultrafiltration combined water treatment system and method - Google Patents
Aerobic granular sludge-immersed ultrafiltration combined water treatment system and method Download PDFInfo
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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
- C02F3/1263—Sequencing batch reactors [SBR]
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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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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- 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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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The disclosure relates to an aerobic granular sludge-immersed ultrafiltration combined water treatment system and method. The aerobic granular sludge-immersed ultrafiltration combined water treatment system comprises a transition zone, an advanced treatment zone and a drug storage zone, wherein the transition zone comprises a raw water storage tank which is internally connected with a raw water inlet pipe; the advanced treatment zone comprises an AGS-SBR reaction tank and an immersed ultrafiltration filter tank, wherein the tail end of a raw water inlet pipe is introduced into the AGS-SBR reaction tank, the AGS-SBR reaction tank is internally connected with a primary water production pipe, the tail end of the primary water production pipe is communicated with the immersed ultrafiltration filter tank, and the immersed ultrafiltration filter tank is internally connected with a secondary water production pipe; the drug storage area comprises a water production storage tank, an alkaline drug feeding tank and an acidic drug feeding tank, the tail end of the secondary water production pipe is communicated with the water production storage tank, the terminal water production pipe and the total backwashing guide pipe are connected in the water production storage tank, and the tail end of the total backwashing guide pipe is communicated with the immersed ultrafiltration filter. The present disclosure is beneficial to the aerobic granular sludge to fully remove organic carbon, total phosphorus, total nitrogen and turbidity, and the ultrafiltration membrane of the immersed ultrafiltration filter can be intermittently cleaned.
Description
Technical Field
The disclosure relates to the technical field of water treatment, in particular to an aerobic granular sludge-immersed ultrafiltration combined water treatment system and method.
Background
Aerobic Granular Sludge (AGS) is Granular activated Sludge formed by microorganisms through self-aggregation and adsorption of extracellular polymers (e.g., biogels such as proteins, polysaccharides, oils and fats, humic acids, etc.). Compared with common flocculent activated sludge, the aerobic granular sludge has the advantages of strong sludge settleability, difficult sludge expansion, regular and smooth shape, compact microbial structure, strong impact resistance, high organic load bearing capacity and the like. The aerobic granular sludge is formed by layering various bacteria populations such as aerobic, facultative and anaerobic from the surface of the granules to the core of the granules, and can form a complete microbial community in a smaller floor area, so that the organic pollutant degradation capability is strong, and the nitrogen and phosphorus removal can be efficiently carried out.
In the aspect of carbon and nitrogen removal, the aerobic granular sludge can realize high-efficiency biological nitrogen removal through the synergistic action of the nitrifying bacteria, the nitrifying bacteria and the denitrifying bacteria in the aerobic granular sludge, and the aerobic granular sludge technology can also better realize the synchronous removal of carbon and nitrogen through the synergistic action of the heterotrophic bacteria, the nitrifying bacteria and the denitrifying bacteria; in the aspect of phosphorus removal, phosphorus accumulating bacteria and glycan bacteria are dominant populations in aerobic granular sludge, wherein the phosphorus accumulating bacteria usually gather at the outer side of the granular sludge, the biological phosphorus removal effect is achieved through the phosphorus release-phosphorus accumulation effect, and the glycan bacteria are located in the inner core of the granular sludge and can provide glycogen, namely energy for the phosphorus accumulating process of the phosphorus accumulating bacteria; in the aspect of salt ions, the aerobic granular sludge has stable shape and is easy to separate sludge and water, and has higher adsorption capacity on heavy metal ions.
According to the prior patents and literature, aerobic granular sludge is generally applied in industrial sewage treatment as a secondary treatment unit alone or as a sludge material for a membrane bioreactor. As an independent water treatment unit, the aerobic granular sludge has weak removal capability on part of small molecular organic matters, micro suspended matters and colloids, and the effect of advanced sewage treatment is difficult to achieve; when the biological membrane bioreactor is used as a material, the granular structure of the biological membrane bioreactor is easy to cause membrane pore blockage, and the aeration space of the biological membrane bioreactor is limited, so that the biological membrane bioreactor is not beneficial to biochemical reactions such as nitrification, phosphorus accumulation and the like of aerobic granular sludge. Therefore, innovations and improvements are needed for the combined process of aerobic granular sludge.
Disclosure of Invention
To solve the above technical problems or to at least partially solve the above technical problems, the present disclosure provides an aerobic granular sludge-submerged ultrafiltration combined water treatment system and method.
The present disclosure provides an aerobic granular sludge-submerged ultrafiltration combined water treatment system, comprising:
the transition zone comprises a raw water storage tank, and the raw water storage tank is internally connected with a raw water inlet pipe;
the advanced treatment area comprises an AGS-SBR reaction tank and an immersed ultrafiltration filter tank, wherein the tail end of the raw water inlet pipe is introduced into the AGS-SBR reaction tank, a primary water production pipe is connected with the AGS-SBR reaction tank in an internal connection mode, the tail end of the primary water production pipe is communicated with the immersed ultrafiltration filter tank, and a secondary water production pipe is connected with the immersed ultrafiltration filter tank in an internal connection mode;
the system comprises a medicine storage area, wherein the medicine storage area comprises a water production storage tank, an alkaline dosing tank and an acidic dosing tank, the tail end of a secondary water production pipe is communicated with the water production storage tank, a terminal water production pipe and a total backwashing conduit are connected in the water production storage tank, the tail end of the total backwashing conduit is communicated with the immersed ultrafiltration filter, the alkaline dosing tank is connected with an alkaline detergent conduit, the acidic dosing tank is connected with an acidic detergent conduit, and the tail end of the alkaline detergent conduit and the tail end of the acidic detergent conduit are both connected with the total backwashing conduit.
Optionally, the top of submergence formula ultrafiltration filter is provided with inlet channel, inlet channel department is provided with superfine grating, superfine grating slope covers inlet channel's water inlet, superfine grating's top be provided with the intake antrum of inlet channel intercommunication, the one-level produce the water pipe terminal with the intake antrum intercommunication.
Optionally, a microporous aeration bottom plate is arranged in the AGS-SBR reaction tank, covers the bottom of the AGS-SBR reaction tank, is connected with a blower unit through a vent pipe, and is filled with aerobic granular sludge.
Optionally, be provided with efflux aeration bottom plate and an at least dull and stereotyped milipore filter in the submergence formula milipore filter, efflux aeration bottom plate passes through the breather pipe and is connected with the blower unit, dull and stereotyped milipore filter is located the top of efflux aeration bottom plate, dull and stereotyped milipore filter is kept away from one side of efflux aeration bottom plate is connected with the collector pipe, the collector pipe intercommunication water pipe is produced to the second grade, dull and stereotyped milipore filter submergence in during the beginning the product water in AGS-SBR reaction tank.
Optionally, be provided with one-level on the one-level product water pipe and produce water pump and one-level product water valve, be provided with second grade product water pump and second grade product water valve on the second grade product water pipe, the collector pipe with be provided with the pressure gauge between the second grade product water pump, the pressure gauge is used for real-time supervision the transmembrane pressure difference of dull and stereotyped milipore filter.
Optionally, be provided with raw water intake pump and raw water intaking valve on the raw water inlet pipe, the back flow is installed to submergence formula ultrafiltration pond's bottom, the end of back flow inserts the raw water inlet pipe, the back flow with the joining point of raw water inlet pipe is located the raw water intaking valve with between the AGS-SBR reaction tank, be provided with backwash pump and reflux valve on the back flow.
Optionally, a total backwashing pump and a total backwashing valve are arranged on the total backwashing conduit, the alkaline cleaning agent conduit and the connection point of the acidic cleaning agent conduit and the total backwashing conduit are located between the total backwashing valve and the immersed ultrafiltration filter, an alkaline dosing pump and an alkaline dosing valve are arranged on the alkaline cleaning agent conduit, and an acidic dosing pump and an acidic dosing valve are arranged on the acidic cleaning agent conduit.
Optionally, a terminal water producing pump and a terminal water producing valve are arranged on the terminal water producing pipe, a liquid level meter is installed on the side wall of the water producing storage tank, and the liquid level meter is used for monitoring the liquid level in the water producing storage tank in real time.
The present disclosure also provides an aerobic granular sludge-submerged ultrafiltration combined water treatment method, comprising the following steps:
s1, starting a raw water inlet valve and a raw water inlet pump, and introducing raw water into the AGS-SBR reaction tank from a raw water storage tank;
s2, after the water feeding of the AGS-SBR reaction tank is finished, closing a raw water inlet pump and a raw water inlet valve, and starting a blower connected with a microporous aeration bottom plate in a blower set to fully aerate the sludge mixed liquid of aerobic granular sludge and raw water in the AGS-SBR reaction tank, wherein the hydraulic power stays for a first preset time to finish the biochemical reaction process;
s3, turning off a blower connected with the microporous aeration bottom plate in the blower set to settle the aerobic granular sludge for a second preset time to complete the mud-water separation process;
s4, opening a primary water production valve and a primary water production pump, introducing supernatant, which accounts for a preset percentage of the total volume, in the AGS-SBR reaction tank into the immersed ultrafiltration filter tank through a superfine grating, simultaneously opening a secondary water production valve and a secondary water production pump, and introducing the ultrafiltered purified water into a water production storage tank;
s5, after the ultrafiltration process is finished, closing the secondary water production pump, the secondary water production valve, the primary water production pump and the primary water production valve;
s6, the steps S1-S5 are repeated until the circulation times reach the preset times;
s7, introducing the purified water in the water production storage tank and the alkaline agent in the alkaline agent feeding tank into the immersed ultrafiltration filter by using the total backwashing guide pipe and the alkaline cleaning agent guide pipe, performing alkaline cleaning on the flat ultrafiltration membrane, and starting the next cycle of steps S1-S5 after the alkaline cleaning is finished;
s8, if the transmembrane pressure difference of the flat ultrafiltration membrane is larger than a preset value after the alkali washing is finished, introducing the purified water in the water production storage tank and an acidic agent in the acidic agent adding tank into the immersed ultrafiltration filter tank by using the total backwashing conduit and the acidic cleaning agent conduit after the one-round circulation step S1-S5, carrying out acid washing on the flat ultrafiltration membrane, and circulating the steps S1-S7 after the acid washing is finished;
and S9, in the process of the operation steps S1-S8, when the liquid level of the water production storage tank exceeds the highest allowable liquid level, opening the terminal water production valve and the terminal water production pump, guiding the final produced water out of the water production storage tank, and when the liquid level of the water production storage tank is lower than the lowest allowable liquid level, closing the terminal water production pump and the terminal water production valve.
Optionally, step S7 specifically includes:
s71, opening a return valve and a return pump, and introducing the residual stored water in the immersed ultrafiltration filter into an AGS-SBR reaction tank;
s72, after the stored water in the immersed ultrafiltration filter tank is emptied, closing the reflux pump and the reflux valve, opening the total backwashing valve and the total backwashing pump, and introducing the purified water stored in the water production storage tank into the immersed ultrafiltration filter tank until the liquid level of the purified water in the immersed ultrafiltration filter tank completely sinks over the top end of the flat ultrafiltration membrane;
s73, after backwashing water inlet, starting an alkaline dosing pump and an alkaline dosing valve, and quantitatively injecting an alkaline medicament;
s74, after backwashing water inlet and dosing are finished, closing the alkaline dosing pump, the alkaline dosing valve, the total backwashing pump and the total backwashing valve to soak the flat ultrafiltration membrane in the reagent solution for a third preset time;
s75, starting a blower connected with the jet aeration bottom plate in the blower set, and carrying out air-water combined backwashing for a fourth preset time;
and S76, turning off the blower connected with the jet flow aeration bottom plate in the blower set, and starting the next circulation of the steps S1-S5.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
1. the process of serially combining the AGS-SBR reaction tank and the immersed ultrafiltration filter tank replaces the conventional aerobic granular sludge-MBR coupling process, is favorable for fully removing total phosphorus and ammonia nitrogen from the aerobic granular sludge in an oxygen-enriched state, and improves the decomposition rate and the decomposition degree of biochemical organic matters, so that the aerobic granular sludge and most suspended matters are fully settled in the AGS-SBR reaction tank; and the ultrafiltration membrane of the immersed ultrafiltration filter can be intermittently cleaned, so that the membrane pollution can be effectively relieved, and the service life of the membrane is prolonged.
2. The ultrafiltration unit adopts an immersed ultrafiltration filter, and compared with pressure ultrafiltration, the immersed ultrafiltration filter occupies a smaller area and has a smaller ineffective volume under the condition of the same daily treated water amount, and a concentrated water reflux system is not required, so that the whole process is simplified.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of an aerobic granular sludge-submerged ultrafiltration combined water treatment system according to an embodiment of the disclosure;
FIG. 2 is a schematic structural diagram of a drug storage area of an aerobic granular sludge-submerged ultrafiltration combined water treatment system according to an embodiment of the disclosure;
fig. 3 is a simulation program control diagram of an aerobic granular sludge-submerged ultrafiltration combined water treatment method according to an embodiment of the disclosure.
Wherein, 1-raw water storage tank; 2-raw water inlet pipe; 3-raw water intake pump; 4-raw water inlet valve; 5-AGS-SBR reaction tank; 6-microporous aeration bottom plate; 7-first-stage water producing pipe; 8-first-stage water production pump; 9-first-stage water producing valve; 10-ultrafine grating; 11-a water collecting pipe; 12-an immersed ultrafiltration filter; 13-jet aeration bottom plate; 14-flat ultrafiltration membrane; 15-a blower unit; 16-a pressure gauge; 17-a secondary water production pipe; 18-a secondary water production pump; 19-a secondary water production valve; 20-a water producing storage tank; 21-terminal water producing pipe; 22-a terminal water pump; 23-terminal water producing valve; 24-a liquid level meter; 25-a return pipe; 26-a reflux pump; 27-a return valve; 28-total backwash conduit; 29-total backwash pump; 30-total backwash valve; 31-an alkaline dosing tank; 32-alkaline cleaner conduits; 33-basic dosing pump; 34-basic dosing valve; 35-an acidic dosing tank; 36-acid cleaner conduit; 37-acid dosing pump; 38-acid dosing valve.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
As shown in fig. 1 and 2, embodiments of the present disclosure provide an aerobic granular sludge-submerged ultrafiltration combined water treatment system, including: transition area, advanced treatment area and medicine storage area.
Specifically, the transition zone comprises a raw water storage tank 1, and a raw water inlet pipe 2 is connected in the raw water storage tank 1; the advanced treatment zone comprises an AGS-SBR reaction tank 5 (namely an aerobic granular sludge-sequencing batch reaction tank) and an immersed ultrafiltration filter 12, wherein the tail end of a raw water inlet pipe 2 is introduced into the AGS-SBR reaction tank 5, a primary water production pipe 7 is connected with the AGS-SBR reaction tank 5 in an inscribed mode, the tail end of the primary water production pipe 7 is communicated with the immersed ultrafiltration filter 12, and a secondary water production pipe 17 is connected with the immersed ultrafiltration filter 12 in an inscribed mode; the medicine storage area comprises a water production storage tank 20, an alkaline dosing tank 31 and an acidic dosing tank 35, the tail end of a secondary water production pipe 17 is communicated with the water production storage tank 20, the water production storage tank 20 is internally connected with a terminal water production pipe 21 and a total backwashing conduit 28, the tail end of the total backwashing conduit 28 is communicated with the immersed ultrafiltration filter 12, the alkaline dosing tank 31 is internally connected with an alkaline detergent conduit 32, the acidic dosing tank 35 is internally connected with an acidic detergent conduit 36, and the tail end of the alkaline detergent conduit 32 and the tail end of the acidic detergent conduit 36 are both communicated with the total backwashing conduit 28.
In specific implementation, the raw water storage tank 1 is generally used as a primary sewage treatment facility or is arranged at the rear end of the primary sewage treatment facility, and is used as a primary sedimentation tank or plays a role of the primary sedimentation tank; raw water primarily precipitated in the raw water storage tank 1 enters the AGS-SBR reaction tank 5 through the raw water inlet pipe 2, aerobic granular sludge in the AGS-SBR reaction tank 5 fully removes organic carbon, total phosphorus and total nitrogen in the raw water in an oxygen-enriched state, the decomposition rate and the decomposition degree of biochemical organic matters are improved, and the aerobic granular sludge and most suspended matters are fully precipitated in the AGS-SBR reaction tank 5; the supernatant after sedimentation enters an immersed ultrafiltration filter 12 through a primary water production pipe 7 for ultrafiltration, so as to achieve the effect of advanced treatment of sewage; the purified water after ultrafiltration enters a water production storage tank 20 through a secondary water production pipe 17 and is finally discharged through a terminal water production pipe 21; when the membrane flux of the ultrafiltration membrane in the immersed ultrafiltration filter 12 is deteriorated, the purified water in the water production storage tank 20 and the alkaline agent in the alkaline dosing tank 31 (or the acidic agent in the acidic dosing tank 35) can be introduced into the immersed ultrafiltration filter 12 by using the total backwashing conduit 28, and the immersed ultrafiltration filter 12 is backwashed, so that the membrane pollution is effectively relieved, and the service life of the membrane is prolonged.
In addition, the ultrafiltration unit of the present disclosure adopts the immersed ultrafiltration filter 12, and compared with pressure type ultrafiltration, the immersed ultrafiltration has a smaller floor area and a smaller ineffective volume under the condition of the same daily treated water amount, and a concentrated water reflux system is not required, which is beneficial to the simplification of the whole process.
Optionally, emptying the aerobic granular sludge in the AGS-SBR reaction tank 5 once at regular intervals, and then adding a batch of newly cultured aerobic granular sludge to prevent the reduction of nitrogen removal, phosphorus removal and carbon removal efficiency after the aerobic granular sludge is inactivated; the time interval length can be determined according to the sludge age, and is generally 40-50 days. When the sludge is emptied, a stirring type submersible sewage pump can be selected to improve the sludge discharge efficiency; when the sludge is added, a common cutting type submersible sewage pump can be selected to avoid the structure of the aerobic granular sludge from being damaged.
In some embodiments, as shown in fig. 1, a water inlet channel is arranged at the top of the immersed ultrafiltration filter 12, an ultrafine grating 10 is arranged at the water inlet channel, the ultrafine grating 10 obliquely covers a water inlet of the water inlet channel, a water inlet groove communicated with the water inlet channel is arranged at the top of the ultrafine grating 10, and the tail end of the primary water production pipe 7 is communicated with the water inlet groove. Specifically, the ultrafine grating 10 (also called a security grating) is a grating with a pore width of 0.2mm-2 mm; because the aerobic granular sludge has excellent settling property, the content of suspended particulate matters in the effluent of the AGS-SBR reaction tank 5 is extremely low, and the ultrafine grid 10 is mainly used for intercepting fibrous suspended matters, so that the blockage or abrasion of the ultrafiltration membrane in the immersed ultrafiltration filter tank 12 caused by the impurities is avoided. In specific implementation, the ultrafine grating 10 should be inspected and cleaned after being used for a long time, so as to avoid serious pollution and blockage of the ultrafine grating 10 and influence on the water inlet flow of the immersed ultrafiltration filter 12.
In some embodiments, as shown in FIG. 1, the aeration device in the AGS-SBR reaction tank 5 employs a microporous aeration floor 6 to ensure high oxygenation efficiency and dissolved oxygen concentration. Specifically, a microporous aeration bottom plate 6 is arranged in the AGS-SBR reaction tank 5, the microporous aeration bottom plate 6 covers the bottom of the AGS-SBR reaction tank 5, the microporous aeration bottom plate 6 is connected with a blower unit 15 through a vent pipe, and the AGS-SBR reaction tank 5 is filled with aerobic granular sludge.
In some embodiments, as shown in fig. 1, the aeration device in the submerged ultrafiltration filter 12 employs a jet aeration bottom plate 13 to ensure that air disturbs the water body under high-speed flow during air-water combined backwashing, and sufficient friction and shear force are generated between the air and the ultrafiltration membrane in the submerged ultrafiltration filter 12, so that pollutants attached to the surface of the ultrafiltration membrane and the gaps between membrane filaments fall off, and the membrane flux is recovered.
Specifically, a jet aeration bottom plate 13 and at least one flat ultrafiltration membrane 14 are arranged in the immersed ultrafiltration filter 12, and the number of the flat ultrafiltration membranes 14 can be specifically multiple; the jet flow aeration bottom plate 13 is connected with a blower unit 15 through a vent pipe, the flat ultrafiltration membrane 14 is positioned above the jet flow aeration bottom plate 13, and the flat ultrafiltration membrane 14 is immersed in the produced water of the AGS-SBR reaction tank 5 at the beginning; furthermore, one side of the flat ultrafiltration membrane 14, which is far away from the jet aeration bottom plate 13, is connected with a water collecting pipe 11, and the water collecting pipe 11 is communicated with a secondary water production pipe 17.
In practical use, the flat ultrafiltration membrane 14 is fixed in the immersed ultrafiltration filter 12 through a membrane box, and the distance between the bottom of the membrane box and the jet aeration bottom plate 13 is kept over 10cm, so that the edge of the membrane is prevented from cracking due to air flow impact; the liquid level in the immersed ultrafiltration filter 12 is kept at a position about 10cm above the top of the membrane box, so that the effective filtration area of the membrane is fully utilized, and the reduction of the filtration performance of the membrane after drying and dehydration is avoided. Wherein, the position of the fixed flat ultrafiltration membrane 14 at the top edge of the membrane box is provided with a water collecting pipe 11, and the ultrafiltration water can directly flow into the secondary water producing pipe 17 after being collected by the water collecting pipe 11.
In a specific implementation, the blower set 15 comprises at least two blowers, one blower is connected with the micropore aeration bottom plate 6, and the other blower is connected with the jet flow aeration bottom plate 13; in practical use, the blower unit 15 may be added with a spare blower.
It should be noted that, when the volume exchange rate of the AGS-SBR reaction tank 5 is set to 50%, the volume of the AGS-SBR reaction tank 5 is ensured to be 2 times or more of the volume of the submerged ultrafiltration filter 12, and the volume of the water production tank 20 is ensured to be 1 time or more of the volume of the submerged ultrafiltration filter 12.
In the specific implementation, the exchange rate of the AGS-SBR reaction tank 5 can be adjusted according to the actual situation, and the volume ratio of the AGS-SBR reaction tank 5 to the immersed ultrafiltration filter 12 can be adjusted appropriately.
In some embodiments, as shown in fig. 1, a raw water inlet pump 3 and a raw water inlet valve 4 are disposed on the raw water inlet pipe 2, a primary water producing pump 8 and a primary water producing valve 9 are disposed on the primary water producing pipe 7, a secondary water producing pump 18 and a secondary water producing valve 19 are disposed on the secondary water producing pipe 17, and a terminal water producing pump 22 and a terminal water producing valve 23 are disposed on the terminal water producing pipe 21.
In some embodiments, as shown in fig. 1, a pressure gauge 16 is disposed between the water collecting pipe 11 and the secondary water production pump 18, and the pressure gauge 16 is configured to monitor the transmembrane pressure difference of the flat ultrafiltration membrane 14 in real time, so that when the transmembrane pressure difference of the flat ultrafiltration membrane 14 is greater than a preset value, it is determined that the membrane flux of the flat ultrafiltration membrane 14 is deteriorated, and the flat ultrafiltration membrane 14 needs to be cleaned in time.
In some embodiments, as shown in fig. 1, a return pipe 25 is installed at the bottom of the submerged ultrafiltration filter 12, the end of the return pipe 25 is connected to the raw water inlet pipe 2, the joint point of the return pipe 25 and the raw water inlet pipe 2 is located between the raw water inlet valve 4 and the AGS-SBR reaction tank 5, and a return pump 26 and a return valve 27 are installed on the return pipe 25.
In some embodiments, as shown in fig. 1 and 2, the total backwash conduit 28 is provided with a total backwash pump 29 and a total backwash valve 30, the junction of the alkaline cleaner conduit 32 and the acidic cleaner conduit 36 with the total backwash conduit 28 is located between the total backwash valve 30 and the submerged ultrafiltration filter 12, the alkaline cleaner conduit 32 is provided with an alkaline dosing pump 33 and an alkaline dosing valve 34, and the acidic cleaner conduit 36 is provided with an acidic dosing pump 37 and an acidic dosing valve 38.
In specific implementation, the return pipe 25 is connected to the raw water inlet pipe 2 through a three-way joint, and the alkaline cleaning agent conduit 32 and the acidic cleaning agent conduit 36 are respectively connected to the total backwashing conduit 28 through three-way joints, so as to save the floor area or space of the pipe gallery structure; the water outlet of the return pipe 25 is positioned at the bottom of the immersed ultrafiltration filter 12 so as to facilitate the evacuation of backwashing water.
Furthermore, the installation position of the return valve 27 is as close as possible to the water inlet of the return pipe 25, so as to avoid the liquid level loss of the immersed ultrafiltration filter 12; the joint of the total backwashing conduit 28 and the immersed ultrafiltration filter 12, the joint of the return pipe 25 and the raw water inlet pipe 2, the joint of the alkaline cleaning agent conduit 32 and the total backwashing conduit 28, and the joint of the acidic cleaning agent conduit 36 and the total backwashing conduit 28 can judge whether a check valve needs to be installed according to the actual pipeline trend.
In some embodiments, the water inlet of the primary water production pipe 7 is immersed 50% below the liquid level of the AGS-SBR reaction tank 5, and if the volume exchange rate of the AGS-SBR reaction tank 5 is higher than 50%, the position of the water inlet of the primary water production pipe 7 needs to be adjusted accordingly.
In some embodiments, as shown in fig. 1, a liquid level meter 24 is installed on a side wall of the water production tank 20, and the liquid level meter 24 is used for monitoring the liquid level in the water production tank 20 in real time, so that when the liquid level in the water production tank 20 exceeds the maximum allowable liquid level, the terminal water production valve 23 and the terminal water production pump 22 are opened to lead the final produced water out of the water production tank 20; and when the liquid level of the water production storage tank 20 is lower than the lowest allowable liquid level, the terminal water production pump 22 and the terminal water production valve 23 are closed.
The embodiment of the disclosure also provides an aerobic granular sludge-immersed ultrafiltration combined water treatment method, which comprises the following steps:
s1, starting a raw water inlet valve 4 and a raw water inlet pump 3, and introducing raw water into an AGS-SBR reaction tank 5 from a raw water storage tank 1;
s2, after the water feeding of the AGS-SBR reaction tank 5 is finished, closing the raw water inlet pump 3 and the raw water inlet valve 4, and starting a blower connected with the microporous aeration bottom plate 6 in the blower set 15 to fully aerate the sludge mixed liquid of the aerobic granular sludge and the raw water in the AGS-SBR reaction tank 5, and stopping the water power for a first preset time to finish the biochemical reaction process;
s3, turning off a blower in the blower set 15 connected with the microporous aeration bottom plate 6 to settle the aerobic granular sludge for a second preset time to complete the mud-water separation process;
s4, opening a primary water production valve 9 and a primary water production pump 8, introducing supernatant, which accounts for a preset percentage of the total volume, in the AGS-SBR reaction tank 5 into the immersed ultrafiltration filter tank 12 through the ultrafine grating 10, simultaneously opening a secondary water production valve 19 and a secondary water production pump 18, and introducing the ultrafiltered purified water into a water production storage tank 20;
s5, after the ultrafiltration process is finished, closing the secondary water production pump 18, the secondary water production valve 19, the primary water production pump 8 and the primary water production valve 9;
s6, the steps S1-S5 are repeated until the circulation times reach the preset times;
s7, introducing the purified water in the water production storage tank and the alkaline agent in the alkaline agent feeding tank into the immersed ultrafiltration filter by using the total backwashing guide pipe and the alkaline cleaning agent guide pipe, performing alkaline cleaning on the flat ultrafiltration membrane, and starting the next cycle of steps S1-S5 after the alkaline cleaning is finished;
s8, if the transmembrane pressure difference of the flat ultrafiltration membrane is larger than a preset value after the alkali washing is finished, introducing the purified water in the water production storage tank and an acidic agent in the acidic agent adding tank into the immersed ultrafiltration filter tank by using the total backwashing conduit and the acidic cleaning agent conduit after the one-round circulation step S1-S5, carrying out acid washing on the flat ultrafiltration membrane, and circulating the steps S1-S7 after the acid washing is finished;
and S9, in the process of the operation steps S1-S8, when the liquid level of the water production storage tank 20 exceeds the highest allowable liquid level, the terminal water production valve 23 and the terminal water production pump 22 are opened, the final produced water is led out of the water production storage tank 20, and when the liquid level of the water production storage tank 20 is lower than the lowest allowable liquid level, the terminal water production pump 22 and the terminal water production valve 23 are closed.
The aerobic granular sludge-immersed ultrafiltration combined water treatment method provided by the embodiment of the disclosure replaces the existing aerobic granular sludge-MBR coupling process with the process of serially combining the AGS-SBR reaction tank 5 and the immersed ultrafiltration filter tank 12, is beneficial to fully removing total phosphorus and ammonia nitrogen from the aerobic granular sludge in an oxygen-rich state, and improves the decomposition rate and the decomposition degree of biochemical organic matters, so that the aerobic granular sludge and most suspended matters are fully settled in the AGS-SBR reaction tank 5; and the flat ultrafiltration membrane 14 can be intermittently cleaned, so that the membrane pollution can be effectively relieved, and the service life of the membrane is prolonged.
In some embodiments, step S7 specifically includes:
s71, opening a return valve 27 and a return pump 26, and introducing the residual water in the immersed ultrafiltration filter 12 into the AGS-SBR reaction tank 5;
s72, after the water storage in the immersed ultrafiltration filter 12 is emptied, closing the reflux pump 26 and the reflux valve 27, opening the total backwashing valve 30 and the total backwashing pump 29, and introducing the purified water stored in the water production storage tank 20 into the immersed ultrafiltration filter 12 until the liquid level of the purified water in the immersed ultrafiltration filter 12 completely sinks over the top end of the flat ultrafiltration membrane 14;
s73, after backwashing water inlet, starting the alkaline dosing pump 33 and the alkaline dosing valve 34, and quantitatively injecting an alkaline medicament;
s74, after backwashing water inlet and dosing are finished, closing the alkaline dosing pump 33, the alkaline dosing valve 34, the total backwashing pump 29 and the total backwashing valve 30, and soaking the flat ultrafiltration membrane 14 in the reagent solution for a third preset time;
s75, starting a blower connected with the jet aeration bottom plate 13 in the blower set 15, and carrying out air-water combined backwashing for a fourth preset time length;
and S76, turning off the blower connected with the jet flow aeration bottom plate 13 in the blower set 15, and starting the next circulation of the steps S1-S5.
The membrane flux of the flat ultrafiltration membrane 14 can be improved by performing alkaline washing on the flat ultrafiltration membrane 14, so that the membrane pollution is effectively relieved, and the service life of the membrane is prolonged; if the transmembrane pressure difference of the flat ultrafiltration membrane 14 is still greater than the preset value after the alkaline cleaning is finished, after one cycle of steps S1-S5 is finished, the acid cleaning can be performed once, and the acid cleaning process is similar to the alkaline cleaning process except that the alkaline dosing pump 33, the alkaline dosing valve 34 and the acidic dosing valve 38 in steps S73 and S74 are replaced by the acidic dosing pump 37 and the alkaline dosing valve 34 and the acidic reagent, and the description is omitted here.
In one embodiment, as shown in fig. 3, the present disclosure provides an aerobic granular sludge-submerged ultrafiltration combined water treatment method, comprising the steps of:
s1, starting a raw water inlet valve 4 and a raw water inlet pump 3, and introducing raw water into an AGS-SBR reaction tank 5 from a raw water storage tank 1 for about 10 min;
s2, after water is completely fed into the AGS-SBR reaction tank 5, closing the raw water inlet pump 3 and the raw water inlet valve 4, and starting a blower connected with the microporous aeration bottom plate 6 in the blower set 15 to fully aerate the sludge mixed liquid of the aerobic granular sludge and the raw water, wherein the hydraulic retention time is about 4 hours, so that the biochemical reaction process is completed;
s3, closing a blower in the blower set 15 connected with the microporous aeration bottom plate 6 to settle the aerobic granular sludge for about 30min, and completing the sludge-water separation process;
s4, opening a primary water producing valve 9 and a primary water producing pump 8, and introducing supernatant accounting for 50% of the total volume into the immersed ultrafiltration filter 12 through a safety superfine grid; meanwhile, the second-stage water production valve 19 and the second-stage water production pump 18 are opened, and the ultrafiltered purified water is introduced into the water production storage tank 20 for about 30 min; in the step, the water inlet of the immersed ultrafiltration filter 12 and the water produced by the immersed ultrafiltration filter 12 run synchronously and have equal flow;
s5, after the ultrafiltration process is finished, closing the secondary water production pump 18, the secondary water production valve 19, the primary water production pump 8 and the primary water production valve 9;
s6, circulating the steps S1-S5;
s71, after the step S1-S5 circularly operates for 10 times, opening a return valve 27 and a return pump 26, and introducing the residual water storage in the immersed ultrafiltration filter 12 into the AGS-SBR reaction tank 5 for about 10 min;
s72, after the stored water in the immersed ultrafiltration filter tank 12 is emptied, closing the reflux pump 26 and the reflux valve 27, opening the total backwashing valve 30 and the total backwashing pump 29, and introducing the purified water stored in the water production storage tank 20 into the immersed ultrafiltration filter tank 12 until the liquid level of the purified water in the membrane tank completely passes through the top end of the flat ultrafiltration membrane 14 for about 30 min;
s73, after backwashing water inlet, starting the alkaline dosing pump 33 and the alkaline dosing valve 34, and quantitatively injecting an alkaline medicament;
s74, after backwashing water inlet and dosing are finished, closing the alkaline dosing pump 33, the alkaline dosing valve 34, the total backwashing pump 29 and the total backwashing valve 30, and soaking the flat ultrafiltration membrane 14 in the reagent solution for about 30 min;
s75, starting a blower connected with the jet aeration bottom plate 13 in the blower set 15, and carrying out air-water combined backwashing for about 20 min;
s76, turning off the blower, and starting the first-stage water producing valve 9, the first-stage water producing pump 8, the second-stage water producing valve 19 and the second-stage water producing pump 18 in sequence to start the next cycle;
s8, when the transmembrane pressure difference of the flat ultrafiltration membrane 14 after alkaline cleaning is still high, acid cleaning is carried out after one cycle of circulation is finished, and the specific method comprises the steps of replacing the alkaline dosing pump 33 in the steps S73 and S74 with the acidic dosing pump 37, replacing the alkaline dosing valve 34 with the acidic dosing valve 38, replacing the alkaline medicament with the acidic medicament, and repeatedly operating the step S7;
and S9, in the process of the operation steps S1-S8, when the liquid level of the water production storage tank 20 exceeds the highest allowable liquid level, the terminal water production valve 23 and the terminal water production pump 22 are opened, the final produced water is led out of the water production storage tank 20, and when the liquid level of the water production storage tank 20 is lower than the lowest allowable liquid level, the terminal water production pump 22 and the terminal water production valve 23 are closed.
In actual use, all the pump and valve devices are uniformly controlled by a programmable logic control cabinet (PLC), so that the operation of the process flow can be automatically completed by setting programs.
It should be noted that, when the whole set of system is put into use for the first time, the submerged ultrafiltration filter 12 is already in a full water state, that is, before the whole set of system is put into use for the first time, the water inlet process of the submerged ultrafiltration filter 12 in steps S1 to S3 and S4 should be operated once separately.
Optionally, the hydraulic retention time of the AGS-SBR reaction tank 5 is 4 hours, and the sludge settling time is 30 min; in practical operation, the duration of the above-mentioned stage can be extended or shortened as appropriate according to practical circumstances.
In specific implementation, the water inlet time and flow rate of the AGS-SBR reaction tank 5, the water production time and flow rate of the AGS-SBR reaction tank 5 (namely the water inlet and production time and flow rate of the immersed ultrafiltration filter 12), the reflux time and flow rate, the medicine adding time and flow rate are comprehensively set according to a plurality of factors such as the power of a corresponding pump, the inner diameter of a corresponding pipeline, the volume of each reaction unit and the like.
It should be noted that the agent used in alkaline cleaning is usually 2500ppm sodium hydroxide or 200ppm sodium hypochlorite, and is used for dissolving organic matter micelles which cause membrane fouling; the pickling agent, usually 2500ppm citric acid, is used to dissolve the metal hydroxide colloid that causes the membrane fouling; in order to ensure the continuous operation of the system, the medicaments stored in the alkaline dosing tank 31 and the acidic dosing tank 35 are high-concentration solutions and are diluted to the required concentration by quantitative purified water led out from the water production storage tank 20 in the dosing process.
Optionally, the soaking time of the medicament is 30min, and the aeration flow of the jet aeration bottom plate 13 is 200Nm during air-water combined backwashing3H, the aeration time is 20 min; in actual operation, the aeration time and the aeration flow rate can be properly adjusted according to actual conditions, and the aeration time and the aeration flow rate are not too high in order to avoid damage of the edge of the ultrafiltration flat membrane under severe impact.
Preferably, the steps S1-S5 are circulated for 10 times and then are subjected to primary alkali washing. Because of the excellent sedimentation performance of the aerobic granular sludge, the turbidity of the supernatant of the AGS-SBR reaction tank 5 is lower, namely the content of suspended matters in the inlet water of the immersed ultrafiltration filter 12 is lower, and membrane pores are not easy to block, so that the physical cleaning process can be omitted and the chemical cleaning frequency is limited; in actual operation, the number of cycles can be increased or decreased as appropriate depending on the operating conditions.
Further, if the immersed ultrafiltration filter 12 runs after the alkaline cleaning, the transmembrane pressure difference of the flat ultrafiltration membrane 14 monitored by the pressure gauge 16 is still increased by a higher slope and approaches the highest allowable transmembrane pressure difference when the ultrafiltration water production is not finished, performing primary acid cleaning after the ultrafiltration water production is finished; the maximum allowable transmembrane pressure difference is determined by the nature of the flat ultrafiltration membrane 14 selected and is typically around 50 kPa.
In practical use, the highest allowable liquid level of the water production storage tank 20 is set to be 10cm lower than the top edge of the water production storage tank 20, and the lowest allowable liquid level of the water production storage tank 20 is set to be a liquid level which enables the water storage amount in the water production storage tank 20 not to be lower than the volume of the submerged ultrafiltration filter 12; in order to simplify the system, the devices such as the terminal water production pipe 21, the terminal water production pump 22, the terminal water production valve 23, the liquid level meter 24 and the like can be eliminated and replaced by an overflow weir, and the volume of the water production storage tank 20 is only required to be ensured not to be lower than that of the immersed ultrafiltration filter 12.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An aerobic granular sludge-submerged ultrafiltration combined water treatment system, comprising:
the device comprises a transition area, a water inlet pipe and a water outlet pipe, wherein the transition area comprises a raw water storage tank (1), and the raw water storage tank (1) is internally connected with the raw water inlet pipe (2);
the advanced treatment zone comprises an AGS-SBR reaction tank (5) and an immersed ultrafiltration filter (12), wherein the tail end of the raw water inlet pipe (2) is introduced into the AGS-SBR reaction tank (5), a primary water production pipe (7) is connected in the AGS-SBR reaction tank (5) in an inscribed mode, the tail end of the primary water production pipe (7) is communicated with the immersed ultrafiltration filter (12), and a secondary water production pipe (17) is connected in the immersed ultrafiltration filter (12) in an inscribed mode;
the chemical storage area comprises a water production storage tank (20), an alkaline chemical feeding tank (31) and an acidic chemical feeding tank (35), the tail end of the secondary water production pipe (17) is communicated with the water production storage tank (20), a terminal water production pipe (21) and a total backwashing conduit (28) are connected in the water production storage tank (20), the tail end of the total backwashing conduit (28) is communicated with the immersed ultrafiltration filter (12), the alkaline chemical feeding tank (31) is connected in an alkaline chemical cleaning agent conduit (32), the acidic chemical feeding tank (35) is connected in an acidic chemical cleaning agent conduit (36), and the tail end of the alkaline chemical cleaning agent conduit (32) and the tail end of the acidic chemical cleaning agent conduit (36) are both connected into the total backwashing conduit (28).
2. The aerobic granular sludge-submerged ultrafiltration combined water treatment system as claimed in claim 1, wherein a water inlet channel is arranged on the top of the submerged ultrafiltration filter tank (12), a superfine grating (10) is arranged at the water inlet channel, the superfine grating (10) covers the top of the water inlet channel in an inclined manner, a water inlet groove is arranged on the top of the superfine grating (10), and the end of the primary water production pipe (7) is communicated with the water inlet groove.
3. The aerobic granular sludge-submerged ultrafiltration combined water treatment system as claimed in claim 1, wherein a microporous aeration bottom plate (6) is arranged in the AGS-SBR reaction tank (5), the microporous aeration bottom plate (6) covers the bottom of the AGS-SBR reaction tank (5), the microporous aeration bottom plate (6) is connected with a blower unit (15) through a vent pipe, and the AGS-SBR reaction tank (5) is filled with aerobic granular sludge.
4. The aerobic granular sludge-submerged ultrafiltration combined water treatment system according to claim 1, wherein a jet aeration bottom plate (13) and at least one flat ultrafiltration membrane (14) are arranged in the submerged ultrafiltration filter tank (12), the jet aeration bottom plate (13) is connected with a blower unit (15) through a vent pipe, the flat ultrafiltration membrane (14) is positioned above the jet aeration bottom plate (13), a water collecting pipe (11) is connected to one side of the flat ultrafiltration membrane (14) far away from the jet aeration bottom plate (13), the water collecting pipe (11) is communicated with the secondary water production pipe (17), and the flat ultrafiltration membrane (14) is initially immersed in the water produced by the AGS-SBR reaction tank (5).
5. The aerobic granular sludge-submerged ultrafiltration combined water treatment system as claimed in claim 4, wherein a primary water production pump (8) and a primary water production valve (9) are arranged on the primary water production pipe (7), a secondary water production pump (18) and a secondary water production valve (19) are arranged on the secondary water production pipe (17), a pressure gauge (16) is arranged between the water collection pipe (11) and the secondary water production pump (18), and the pressure gauge (16) is used for monitoring transmembrane pressure difference of the flat ultrafiltration membrane (14) in real time.
6. The aerobic granular sludge-submerged ultrafiltration combined water treatment system as claimed in any one of claims 1 to 5, wherein a raw water inlet pump (3) and a raw water inlet valve (4) are arranged on the raw water inlet pipe (2), a return pipe (25) is installed at the bottom of the submerged ultrafiltration filter (12), the tail end of the return pipe (25) is connected to the raw water inlet pipe (2), the connection point of the return pipe (25) and the raw water inlet pipe (2) is located between the raw water inlet valve (4) and the AGS-SBR reaction tank (5), and a return pump (26) and a return valve (27) are arranged on the return pipe (25).
7. The aerobic granular sludge-submerged ultrafiltration combined water treatment system according to any one of claims 1 to 5, wherein a total backwash pump (29) and a total backwash valve (30) are arranged on the total backwash conduit (28), the junction of the alkaline cleaner conduit (32) and the acidic cleaner conduit (36) with the total backwash conduit (28) is located between the total backwash valve (30) and the submerged ultrafiltration filter (12), the alkaline cleaner conduit (32) is provided with an alkaline dosing pump (33) and an alkaline dosing valve (34), and the acidic cleaner conduit (36) is provided with an acidic dosing pump (37) and an acidic dosing valve (38).
8. The aerobic granular sludge-submerged ultrafiltration combined water treatment system as claimed in any one of claims 1 to 5, wherein the terminal water production pipe (21) is provided with a terminal water production pump (22) and a terminal water production valve (23), the side wall of the water production storage tank (20) is provided with a liquid level meter (24), and the liquid level meter (24) is used for monitoring the liquid level in the water production storage tank (20) in real time.
9. An aerobic granular sludge-immersed ultrafiltration combined water treatment method is characterized by comprising the following steps:
s1, starting a raw water inlet valve (4) and a raw water inlet pump (3), and introducing raw water into an AGS-SBR reaction tank (5) from a raw water storage tank (1);
s2, after the AGS-SBR reaction tank (5) finishes water inflow, closing a raw water inlet pump (3) and a raw water inlet valve (4), starting a blower connected with a microporous aeration bottom plate (6) in a blower set (15), fully aerating sludge mixed liquor of aerobic granular sludge and raw water in the AGS-SBR reaction tank (5), and hydraulically staying for a first preset time to finish a biochemical reaction process;
s3, turning off a blower in the blower unit (15) connected with the microporous aeration bottom plate (6) to settle the aerobic granular sludge for a second preset time to complete the mud-water separation process;
s4, opening a primary water production valve (9) and a primary water production pump (8), introducing supernate which accounts for a preset percentage of the total volume in the AGS-SBR reaction tank (5) into the immersed ultrafiltration filter tank (12) through a superfine grating (10), and simultaneously opening a secondary water production valve (19) and a secondary water production pump (18) and introducing the ultrafiltered purified water into a water production storage tank (20);
s5, after the ultrafiltration process is finished, closing the secondary water production pump (18), the secondary water production valve (19), the primary water production pump (8) and the primary water production valve (9);
s6, the steps S1-S5 are repeated until the circulation times reach the preset times;
s7, introducing purified water in the water production storage tank (20) and an alkaline medicament in the alkaline dosing tank (31) into the immersed ultrafiltration filter (12) by using the total backwashing conduit (28) and the alkaline cleaning agent conduit (32), performing alkaline cleaning on the flat ultrafiltration membrane (14), and after the alkaline cleaning is finished, starting the next cycle of steps S1-S5;
s8, if the transmembrane pressure difference of the flat ultrafiltration membrane (14) is larger than a preset value after the alkali washing is finished, introducing purified water in the water production storage tank (20) and an acid medicament in the acid dosing tank (35) into the immersed ultrafiltration filter (12) by using the total backwashing conduit (28) and the acid cleaning agent conduit (36) after a cycle of steps S1-S5 is finished, carrying out acid washing on the flat ultrafiltration membrane (14), and after the acid washing is finished, circulating steps S1-S7;
s9, in the process of operation steps S1-S8, when the liquid level of the water production storage tank (20) exceeds the highest allowable liquid level, the terminal water production valve (23) and the terminal water production pump (22) are opened, the final produced water is led out of the water production storage tank (20), and when the liquid level of the water production storage tank (20) is lower than the lowest allowable liquid level, the terminal water production pump (22) and the terminal water production valve (23) are closed.
10. The aerobic granular sludge-submerged ultrafiltration combined water treatment method as claimed in claim 9, wherein the step S7 specifically comprises:
s71, opening a reflux valve (27) and a reflux pump (26), and introducing the residual water storage in the immersed ultrafiltration filter (12) into an AGS-SBR reaction tank (5);
s72, after the stored water in the immersed ultrafiltration filter (12) is emptied, closing the reflux pump (26) and the reflux valve (27), opening the total backwashing valve (30) and the total backwashing pump (29), and introducing the purified water stored in the water production storage tank (20) into the immersed ultrafiltration filter (12) until the liquid level of the purified water in the immersed ultrafiltration filter (12) completely submerges over the top end of the flat ultrafiltration membrane (14);
s73, after backwashing water inlet, opening an alkaline dosing valve (34) and an alkaline dosing pump (33) and quantitatively injecting an alkaline medicament;
s74, after backwashing water inlet and dosing are finished, closing the alkaline dosing pump (33), the alkaline dosing valve (34), the total backwashing pump (29) and the total backwashing valve (30), and soaking the flat ultrafiltration membrane (14) in the reagent solution for a third preset time;
s75, starting a blower connected with the jet aeration bottom plate (13) in the blower set (15) to carry out air-water combined backwashing for a fourth preset time;
and S76, turning off a blower connected with the jet flow aeration bottom plate (13) in the blower set (15), and starting the next cycle of steps S1-S5.
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