CN116177744A - Sewage treatment system and method for improving efficient denitrification and dephosphorization of AOA technology coupled MBR - Google Patents
Sewage treatment system and method for improving efficient denitrification and dephosphorization of AOA technology coupled MBR 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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2853—Anaerobic digestion processes using anaerobic membrane bioreactors
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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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
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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
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
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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
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- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The application relates to the technical field of sewage treatment, in particular to a sewage treatment system and a sewage treatment method for coupling an improved AOA technology with MBR (membrane bioreactor) to efficiently remove nitrogen and phosphorus. The sewage treatment system for efficiently removing nitrogen and phosphorus by coupling the improved AOA technology with the MBR comprises a water inlet pipe, a water outlet pipe, an oxygen removing area, an anaerobic area, an aerobic area, a facultative area, an anoxic area, a membrane separation area and a sludge reflux assembly; the water inlet pipe is communicated with the anaerobic zone and the facultative zone, and the water outlet pipe is communicated with the membrane separation zone; the two ends of the first sludge return pipe are respectively communicated with the membrane separation area and the oxygen elimination area, and the two ends of the second sludge return pipe are respectively communicated with the membrane separation area and the facultative area. The sewage treatment system with the improved AOA technology coupled with the MBR for high-efficiency denitrification and dephosphorization is based on the segmented water inlet improved AOA technology coupled with the MBR for high-efficiency denitrification and dephosphorization, so that the problems of low denitrification efficiency and large carbon source addition amount of the existing MBR technology are solved, and the sewage treatment system has the advantages of high carbon source utilization rate, excellent denitrification effect and low energy consumption.
Description
Technical Field
The application relates to the technical field of sewage treatment, in particular to a sewage treatment system and a sewage treatment method for coupling an improved AOA technology with MBR (membrane bioreactor) to efficiently remove nitrogen and phosphorus.
Background
The MBR technology is widely applied to domestic on-ground and underground sewage treatment plants at present, and has the advantages of high pollutant removal efficiency, strong impact load resistance, good effluent quality, occupied area saving and the like, and also has the disadvantages of high energy consumption, poor total nitrogen removal effect, high life cycle cost, high comprehensive carbon emission and the like.
In principle, the MBR technology improves the sludge concentration through membrane separation, and respectively controls the hydraulic retention time HRT and the sludge age SRT, so that the whole biochemical system achieves better denitrification and dephosphorization effects. According to statistics, more than 95% of MBR coupled biochemical processes are AAO processes and modifications thereof, including AAOA, UCT, MUCT, multistage AO and the like. In actual operation, the MBR process can effectively ensure that the nitrification reaction and the carbonization reaction are carried out, but the denitrification and dephosphorization effects are poor, and high-quality carbon source denitrification and dephosphorization medicaments are required to be additionally added for dephosphorization under most operation conditions. For this reason, in the existing MBR coupling AAO and improved process, in order to ensure a certain denitrification effect, a large proportion of reflux is required, and in order to maintain the sludge concentration and avoid too high dissolved oxygen, a multi-stage reflux is required, and the total reflux amount is always more than 1000%. The dilution effect generated by large-scale reflux and the consumption of internal and external carbon sources caused by gradual reflux are difficult to avoid, so that the rapid consumption of the carbon sources can occur, but the removal effect of nitrogen and phosphorus in water is poor.
In view of this, the present invention has been proposed.
Disclosure of Invention
The invention aims to provide a sewage treatment system for improving the efficient denitrification and dephosphorization of an AOA technology coupled with an MBR so as to solve the problems.
The above purpose is achieved by the following technical scheme:
a sewage treatment system for improving the high-efficiency denitrification and dephosphorization of an AOA technology-coupled MBR comprises a water inlet pipe, a water outlet pipe, an oxygen elimination zone, an anaerobic zone, an aerobic zone, a facultative zone, an anoxic zone, a membrane separation zone and a sludge reflux component; the anaerobic zone, the aerobic zone, the facultative zone, the anoxic zone and the membrane separation zone are sequentially communicated; the water inlet pipe is communicated with the anaerobic zone and the facultative zone, and the water outlet pipe is communicated with the membrane separation zone;
the sludge reflux assembly comprises a first sludge reflux pipe, a second sludge reflux pipe and a third sludge reflux pipe; the two ends of the first sludge return pipe are respectively communicated with the membrane separation area and the oxygen elimination area, the two ends of the second sludge return pipe are respectively communicated with the membrane separation area and the facultative area, and the two ends of the third sludge return pipe are respectively communicated with the oxygen elimination area and the anaerobic area.
In one embodiment of the invention, the oxygen-removing zone, the anaerobic zone, the facultative zone and the anoxic zone are all provided with stirring devices.
In one embodiment of the invention, the sewage treatment system for coupling the improved AOA technology with the MBR for high-efficiency denitrification and dephosphorization further comprises an aeration device arranged in the aerobic zone, wherein the aeration device comprises an aeration fan, an aeration pipeline and an aeration head;
the aeration head is arranged in the aerobic zone and is connected with the aeration fan through an aeration pipeline.
In one embodiment of the invention, the sewage treatment system with the improved AOA technology coupled with the MBR for high-efficiency denitrification and dephosphorization further comprises a sludge pump and a sludge pipe;
the mud discharging pipe is communicated with the bottom of the membrane separation zone, and the mud discharging pump is arranged at the communication position of the mud discharging pipe and the membrane separation zone.
In one embodiment of the invention, the sludge return assembly further comprises a first sludge return pump and a second sludge return pump;
the first sludge reflux pump and the second sludge reflux pump are both arranged at the bottom of the membrane separation zone, the first sludge reflux pump is arranged at the communication position of the first sludge reflux pipe and the membrane separation zone, and the second sludge reflux pump is arranged at the communication position of the second sludge reflux pipe and the membrane separation zone.
In one embodiment of the invention, the sludge recirculation assembly further comprises a third sludge recirculation pump;
the third sludge reflux pump is arranged at the bottom of the membrane separation zone, and the first sludge reflux pipe and the second sludge reflux pipe are both communicated with the third sludge reflux pump.
A sewage treatment method for efficiently denitrifying and dephosphorizing by coupling an improved AOA technology with an MBR is realized by adopting the sewage treatment system for efficiently denitrifying and dephosphorizing by coupling the improved AOA technology with the MBR, and comprises the following steps of
Introducing sewage to be treated into an anaerobic zone and a facultative zone through a water inlet pipe, mixing the sewage introduced into the anaerobic zone with sludge returned to the anaerobic zone by a third sludge return pipe, and carrying out COD adsorption, internal carbon source conversion and phosphorus release reaction to cooperatively carry out denitrification dephosphorization;
introducing the sewage treated by the anaerobic zone into an aerobic zone, and performing nitrification and phosphorus absorption reaction in the aerobic zone to remove ammonia nitrogen and phosphorus in the sewage;
introducing the sewage treated by the aerobic zone into a facultative zone, and performing low-dissolved oxygen synchronous nitrification and denitrification reaction in the facultative zone to synchronously remove nitrogen; and the sludge returned to the facultative zone through the second sludge return pipe provides a carbon source for synchronous nitrification and denitrification of the facultative zone;
the sewage treated by the facultative zone and the second sludge reflux pipe reflux the sludge returned to the facultative zone to be led into an anoxic zone, and the sewage is further denitrified and endogenous denitrified in the anoxic zone; after the sludge returned by the second sludge return pipe flows into the anoxic zone, a carbon source is provided for denitrification in the anoxic zone; and part of raw water in the facultative zone directly enters the anoxic zone to provide an additional carbon source;
and (3) introducing the sewage treated by the anoxic zone into a membrane separation zone, separating mud and water from the sewage in the membrane separation zone, returning part of the bottom sludge to the anaerobic zone through the oxygen elimination zone, returning the other part to the facultative zone, and discharging the residual sludge.
In one embodiment of the invention, the water inlet of the anaerobic zone is distributed in proportion of 70% -100% and the water inlet of the facultative zone is distributed in proportion of 0% -30%.
In one embodiment of the invention, the sludge reflux ratio of the reflux to the oxygen-eliminating area is 50-150%.
In one embodiment of the invention, the sludge reflux ratio of the reflux to the facultative zone is 50% -150%.
The beneficial technical effects of the invention are as follows:
1. the sewage treatment system for efficiently removing nitrogen and phosphorus by coupling the improved AOA technology with the MBR comprises a water inlet pipe, a water outlet pipe, an oxygen removing area, an anaerobic area, an aerobic area, a facultative area, an anoxic area, a membrane separation area and a sludge reflux assembly; the anaerobic zone, the aerobic zone, the facultative zone, the anoxic zone and the membrane separation zone are sequentially communicated; the water inlet pipe is communicated with the anaerobic zone and the facultative zone, and the water outlet pipe is communicated with the membrane separation zone; the sludge reflux assembly comprises a first sludge reflux pipe, a second sludge reflux pipe and a third sludge reflux pipe; the two ends of the first sludge return pipe are respectively communicated with the membrane separation area and the oxygen elimination area, the two ends of the second sludge return pipe are respectively communicated with the membrane separation area and the facultative area, and the two ends of the third sludge return pipe are respectively communicated with the oxygen elimination area and the anaerobic area.
2. The sewage treatment system with the improved AOA technology coupled with the MBR for high-efficiency denitrification and dephosphorization is based on the segmented water inlet improved AOA technology coupled with the MBR for high-efficiency denitrification and dephosphorization, so that the problems of low denitrification efficiency and large carbon source addition amount of the existing MBR technology are solved, and the sewage treatment system has the advantages of high carbon source utilization rate, excellent denitrification effect and low energy consumption.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow diagram of a sewage treatment system for efficient denitrification and dephosphorization by coupling an improved AOA process with an MBR provided by the present application;
fig. 2 is a schematic structural diagram of a sewage treatment system with improved AOA technology coupled with MBR for efficient denitrification and dephosphorization.
Icon: 1-a water pump; 2-an oxygen-eliminating area; 3-anaerobic zone; 4-an aerobic zone; a 6-facultative region; 7-anoxic zone; 9-a membrane separation zone; 10-a clean water pump; 13-a first sludge return pipe; 14-a second sludge return pipe; 15-a sludge control system; a 16-carbon steady state regulation system; 17-a water inlet branch pipe; 18-monitoring instrument I; 21-monitoring instrument II; 22-monitoring instrument III; 24-an aeration fan; 25-membrane pool purge blower.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the embodiments of the present application, it should be noted that, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that is conventionally put when the product of the application is used, or the orientation or positional relationship that is conventionally understood by those skilled in the art, or the orientation or positional relationship that is conventionally put when the product of the application is used, which is merely for convenience of describing the application and simplifying the description, and is not indicative or implying that the device or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the application. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the embodiments of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
Referring to fig. 1 and 2, the present embodiment provides a sewage treatment system for efficiently denitrifying and dephosphorizing by coupling an improved AOA process to an MBR, which includes a water inlet pipe, a water outlet pipe, an oxygen-removing zone 2, an anaerobic zone 3, an aerobic zone 4, a facultative zone 6, an anoxic zone 7, a membrane separation zone 9 and a sludge reflux assembly; the anaerobic zone 3, the aerobic zone 4, the facultative zone 6, the anoxic zone 7 and the membrane separation zone 9 are communicated in sequence; the water inlet pipe is communicated with the anaerobic zone 3 and the facultative zone 6, and the water outlet pipe is communicated with the membrane separation zone 9;
the sludge reflux assembly comprises a first sludge reflux pipe 13, a second sludge reflux pipe 14 and a third sludge reflux pipe; the two ends of the first sludge return pipe 13 are respectively communicated with the membrane separation zone 9 and the oxygen elimination zone 2, the two ends of the second sludge return pipe 14 are respectively communicated with the membrane separation zone 9 and the facultative zone 6, and the two ends of the third sludge return pipe are respectively communicated with the oxygen elimination zone 2 and the anaerobic zone 3. The water inlet pipe communicated with the anaerobic zone 3 is a water inlet and distribution pipe 17.
Wherein, the inlet pipe is used for leading in sewage to be treated to the anaerobic zone 3 and the facultative zone 6, and the outlet pipe is used for leading out clean water generated in the membrane separation zone 9.
Referring to fig. 1 and 2, the sewage treatment system with the improved AOA technology coupled with MBR for high-efficiency denitrification and dephosphorization has the following working principle:
the system is based on the sectional water inlet improved AOA technology and coupled with MBR membrane separation for high-efficiency denitrification and dephosphorization, so as to solve the problems of low denitrification efficiency and large carbon source addition amount of the existing MBR technology, and has the advantages of high carbon source utilization rate, excellent denitrification effect and low energy consumption. Specifically, the AOA technology ensures the carbon source adsorption and phosphorus release effects by re-dividing the cell capacity ratio and longer anaerobic time; the shorter aerobic residence time reduces the consumption of a carbon source in an aerobic tank and saves energy consumption at the same time; and the anaerobic stage is utilized to adsorb carbon sources and synthesized PHA and other internal carbon sources for long anoxic time, so that sufficient endogenous denitrification is performed, and high denitrification efficiency is ensured. In addition, the longer anaerobic zone 3 ensures higher biological phosphorus removal rate through denitrification phosphorus removal, realizes 'one-carbon dual-purpose', and further reduces carbon source consumption.
Specifically, the sewage treatment system with the improved AOA technology coupled with MBR for high-efficiency denitrification and dephosphorization has the following treatment processes:
sewage to be treated enters an anaerobic zone 3 and is mixed with sludge which flows back to the anaerobic zone 3, COD is adsorbed, internal carbon source conversion and phosphorus release reaction are carried out, and denitrification dephosphorization is carried out cooperatively;
the effluent of the anaerobic zone 3 enters an aerobic zone 4 for nitrification and phosphorus absorption reaction, so that ammonia nitrogen and phosphorus in the sewage are removed;
the effluent of the aerobic zone 4 enters a facultative zone 6 to carry out low-dissolved oxygen synchronous nitrification and denitrification reaction, and nitrogen is synchronously removed;
the effluent of the facultative zone 6 enters an anoxic zone 7 for further denitrification and endogenous denitrification, and the sludge returned to the facultative zone 6 provides a carbon source for synchronous nitrification and denitrification of the facultative zone 6 and further provides a carbon source for denitrification of the anoxic zone 7; part of the raw water is directly distributed into the anoxic zone 7, providing an additional carbon source.
The effluent of the anoxic zone 7 flows into the membrane separation zone 9, after mud-water separation, part of sludge at the bottom flows back to the front end of the oxygen elimination zone 2, part of sludge flows back to the front end of the facultative zone 6, and the rest of sludge is pumped to a sludge discharge pipe for discharge.
Referring to fig. 1 and 2, in the present embodiment, the oxygen-removing zone 2, the anaerobic zone 3, the facultative zone 6 and the anoxic zone 7 are all provided with stirring devices for mixing sewage, sludge or chemicals entering the oxygen-removing zone 2, the anaerobic zone 3, the facultative zone 6 and the anoxic zone 7. In addition, in order to aerate the sewage in the aerobic zone 4, the sewage treatment system for efficiently denitrifying and dephosphorizing by coupling the improved AOA technology with the MBR also comprises an aeration device arranged in the aerobic zone 4, wherein the aeration device comprises an aeration fan 24, an aeration pipeline and an aeration head; an aeration head is arranged in the aerobic zone 4 and is connected with an aeration fan 24 through an aeration pipeline. In order to discharge the surplus sludge in the membrane separation zone 9, the sewage treatment system for efficiently denitrifying and dephosphorizing by coupling the improved AOA technology with the MBR also comprises a sludge pump and a sludge discharge pipe; the mud pipe is communicated with the bottom of the membrane separation zone 9, and the mud pump is arranged at the communication position of the mud pipe and the membrane separation zone 9.
In order to return the sludge at the bottom of the membrane separation zone 9 to the first sludge return pipe 13 and the second sludge return pipe 14, the sludge return assembly further comprises a first sludge return pump and a second sludge return pump; the first sludge reflux pump and the second sludge reflux pump are both arranged at the bottom of the membrane separation zone 9, the first sludge reflux pump is arranged at the communication position of the first sludge reflux pipe 13 and the membrane separation zone 9, and the second sludge reflux pump is arranged at the communication position of the second sludge reflux pipe 14 and the membrane separation zone 9.
In addition to the above, in other embodiments of the present invention, a mode in which the sludge recirculation assembly further includes a third sludge recirculation pump provided at the bottom of the membrane separation zone 9 may be adopted, and the first sludge recirculation pipe 13 and the second sludge recirculation pipe 14 are both in communication with the third sludge recirculation pump, that is, a mode in which the first sludge recirculation pipe 13 and the second sludge recirculation pipe 14 share one sludge recirculation pump.
Based on the above, please refer to fig. 1 and 2, the present invention also provides a sewage treatment method for efficiently denitrifying and dephosphorizing by coupling an improved AOA process with an MBR, which is implemented by adopting the sewage treatment system for efficiently denitrifying and dephosphorizing by coupling an improved AOA process with an MBR, comprising
Introducing sewage to be treated into an anaerobic zone 3 and a facultative zone 6 through a water inlet pipe, mixing the sewage introduced into the anaerobic zone 3 with sludge returned to the anaerobic zone 3 through a third sludge return pipe, and carrying out COD adsorption, internal carbon source conversion and phosphorus release reaction to cooperatively carry out denitrification dephosphorization;
introducing the sewage treated by the anaerobic zone 3 into an aerobic zone 4, and performing nitrification and phosphorus absorption reaction in the aerobic zone 4 to remove ammonia nitrogen and phosphorus in the sewage;
the sewage treated by the aerobic zone 4 is led into a facultative zone 6, and low-dissolved oxygen synchronous nitrification and denitrification reactions are carried out in the facultative zone 6 to synchronously remove nitrogen; and the sludge returned to the facultative zone 6 through the second sludge return pipe 14 provides a carbon source for synchronous nitrification and denitrification of the facultative zone 6;
the sewage treated by the facultative zone 6 and the second sludge reflux pipe 14 reflux to the facultative zone 6 are led into the anoxic zone 7, and the sewage is further denitrified and endogenous denitrified in the anoxic zone 7; after the sludge returned by the second sludge return pipe 14 flows into the anoxic zone 7, a carbon source is provided for denitrification of the anoxic zone 7; and part of raw water in the facultative zone 6 directly enters the anoxic zone 7 to provide an additional carbon source;
the sewage treated by the anoxic zone 7 is led into the membrane separation zone 9, after mud-water separation of the sewage in the membrane separation zone 9, part of the bottom sludge flows back to the anaerobic zone 3 through the anoxic zone 2, and the other part flows back to the facultative zone 6, and the residual sludge is discharged.
Further, in this embodiment, the inflow water of the anaerobic zone 3 is proportionally distributed 70% -100%, and the inflow water of the anoxic zone 6 is proportionally distributed 0% -30%. The reflux ratio of the sludge which flows back to the oxygen eliminating area 2 is 50-150%. The reflux ratio of the sludge which flows back to the facultative zone 6 is 50-150%.
Specifically, referring to fig. 1 and 2, incoming water is proportionally distributed according to the situation of carbon-nitrogen ratio, 70% -100% of the incoming water enters the anaerobic zone 3,0% -30% of the incoming water enters the facultative zone 6, and the direct distribution of carbon sources in raw water is performed; the subsequent water passes through the anaerobic zone 3 to realize the synthesis and adsorption of an internal carbon source and the hydrolysis of phosphorus and enters the aerobic zone 4; through the aerobic zone 4 with shorter residence time and combined with low-oxygen aeration control, the nitrification reaction is realized, and excessive carbon source loss and carbonization reaction are avoided; the effluent from the aerobic zone 4 enters a facultative zone 6, and is mixed with sludge in the facultative zone in a reflux way, and the reflux liquid and dissolved oxygen carried by the aerobic tail end are consumed; the facultative zone 6 subsequently enters an anoxic zone 7, and the mixed solution after anoxic confluence and oxygen elimination and a small amount of raw water are subjected to denitrification and endogenous denitrification by utilizing a raw water carbon source; the anoxic zone 7 enters the MBR membrane separation zone 9, a membrane module is arranged, and when solid-liquid separation is carried out, a small amount of ammonia nitrogen is removed on one hand, and on the other hand, nitrogen is blown off, and the energy conservation and consumption reduction are enhanced and the dissolved oxygen is prevented from being too high in the membrane separation zone 9 in a pulse aeration mode; the sludge reflux part is used for carrying out reflux by arranging a pump at the rear end of the membrane separation zone 9, and the sludge in the first sludge reflux pipe 13 enters the oxygen elimination zone 2 to reduce dissolved oxygen and then enters the anaerobic zone 3 to be mixed with incoming water; the sludge in the second sludge return pipe 14 enters the facultative zone 6 and is mixed with the effluent of the aerobic zone 4.
To sum up, referring to fig. 1 and 2, the sewage treatment method based on the above-mentioned improved AOA technology coupled with MBR for efficient denitrification and dephosphorization, the operation process of the sewage treatment system based on the improved AOA technology coupled with MBR for efficient denitrification and dephosphorization is as follows:
after being lifted by the water pump 1, the sewage is distributed to the anaerobic zone 3 and the facultative zone 6;
the first sludge return pipe 13 returns sludge to the oxygen-eliminating area 2 for stirring and oxygen elimination, then enters the anaerobic area 3, is mixed with raw sewage distributed to the anaerobic area 3, and performs synthesis of adsorption COD and internal carbon source, adsorption and hydrolysis of phosphorus accumulation, and cooperatively performs denitrification dephosphorization;
the effluent of the anaerobic zone 3 enters an aerobic zone 4, and through the aerobic zone 4 with shorter residence time and the combination of low-oxygen aeration control, the nitrification reaction is realized, and excessive carbon source loss and carbonization reaction are avoided;
the effluent of the aerobic zone 4 enters a facultative zone 6 and is mixed with the return sludge of a second sludge return pipe 14 to perform low-dissolved oxygen synchronous nitrification and denitrification reaction, so as to synchronously remove nitrogen;
the effluent from the facultative zone 6 enters an anoxic zone 7 for further denitrification and endogenous denitrification. The sludge returned by the second sludge return pipe 14 increases the concentration of the sludge in the subsequent link and further provides a carbon source for denitrification in the anoxic zone 7; part of the raw water is directly distributed into the front end of the facultative zone 6 to provide additional carbon source.
The effluent of the anoxic zone 7 flows into the membrane separation zone 9, after mud-water separation, part of sludge at the bottom flows back to the front end of the oxygen elimination zone 2, part of sludge flows back to the front end of the facultative zone 6, and the rest of sludge is pumped to a sludge discharge pipe for discharge. The treated water is sucked by the clean water pump 10 and discharged.
In order to control the return ratio of the sludge, the first sludge return pipe 13 and the second sludge return pipe 14 are respectively provided with a sludge regulation system 15 and a carbon steady state regulation system 16; the sludge regulation and control system 15 is responsible for intelligently regulating the reflux quantity and the sludge concentration according to the front-end water quality condition and the sludge condition of the anaerobic zone 3, and the reflux quantity regulation and control range is 50-150%; the carbon steady-state regulation and control system 16 is responsible for flexibly regulating the reflux quantity according to the front-end carbon nitrogen ratio data, the data of the anoxic effluent monitoring instrument II 21 and the sludge concentration, and can supplement a small amount of high-quality carbon source reflux quantity by 50-150%.
In addition, an aeration fan 24 of the aeration device and a membrane tank sweeping fan 25 in the membrane separation tank are respectively provided with an air gauge and an air regulating valve, and an aeration control system is arranged, wherein the aeration control system comprises that the aerobic process performs accurate aeration control according to a first monitoring instrument 18, and the membrane separation zone 9 performs pulse cycle aeration control according to a third monitoring instrument 22.
In the above process: the total hydraulic retention time of the biochemical pond is 10 hours, the hydraulic retention time of the oxygen elimination zone 2 is 1.0 hour, the hydraulic retention time of the anaerobic zone 3 is 1.5 hours, the hydraulic retention time of the aerobic zone 4 is 3 hours, the hydraulic retention time of the facultative zone 6 is 1 hour, and the hydraulic retention time of the anoxic zone 7 is 3.5 hours; part of sludge in the membrane separation zone 9 flows back to the oxygen elimination zone 2 through the first sludge return pipe 13, the reflux ratio is 50% -150%, and part of sludge in the membrane separation zone 9 flows back to the facultative zone 6 through the second sludge return pipe 14, and the reflux ratio is 50% -150%; the DO concentration at the end of the aerobic zone 4 is controlled at 2mg/L, and the DO concentration at the middle section of the facultative zone 6 is controlled at 0.5mg/L; the control range of MLSS in the anaerobic zone 3 and the aerobic zone 4 is 4000-6000 mg/L, the control range of MLSS in the facultative zone 6 and the anoxic zone 7 is 7500-8500 mg/L, and the control range of MLSS in the membrane separation zone 9 is 10000-12000 mg/L.
Specifically, a sewage treatment plant adopts an AOA+MBR process, the daily throughput is designed to be 50000m < 3 >/d, and the effluent is subjected to local standard (standard IV class). The design water quality of the inlet and outlet water of the sewage plant is shown in table 1. The total tank capacity of the biochemical tank is 20960m3, the total HRT is about 10 hours, the retention time of each function is shown in table 2, and the actual water quality of the inlet and outlet water is shown in table 3.
Table 1 shows the quality of water (mg/L)
| Functional zone residence time/h | Oxygen-eliminating area | Anaerobic zone | Aerobic zone | Facultative zone | Anoxic zone |
| Device A | 0.5 | 1.51 | 3.50 | 1.20 | 3.30 |
TABLE 2 residence time for functional zones
TABLE 3 actual Water quality of incoming and outgoing Water (mg/L)
Thus, through the process treatment, the water quality data of inlet water and outlet water are as follows (the unit is mg/L):
| COD cr | TN | TP | NH 3 -N | |
| inflow of water | 300～460 | 40～60 | 4～6 | 30～48 |
| Effluent water | ≤30 | ≤8 | ≤0.3 | ≤1 |
The effluent quality is stable and superior to the emission standard of Beijing standard B (quasi-IV water), the total nitrogen and ammonia nitrogen index reaches the emission standard of Beijing standard A (quasi-III water), and the sewage denitrification effect is remarkable.
Further, an application example A of the sewage treatment system adopting the improved AOA technology coupled with MBR high-efficiency denitrification and dephosphorization sewage treatment method is as follows:
the daily treatment capacity of the design of the application example A is 100m3/d, and the effluent executes the first-level A standard; the total cell volume of the biochemical cell and the membrane cell of application example A was 48.5m3 and the total residence time was 14.17h, wherein the cell volumes of the different functional areas of each device are shown in Table 4.
The AAO+MBR technology is adopted in the comparative example B, the daily throughput of the design of the comparative example B is 100m3/d, and the effluent performs the first-level A standard; the total cell volume of the biochemical cell and the membrane cell of comparative example B was 48.5m3, and the total residence time was 14.17h, wherein the cell volumes of the different functional areas of each device are shown in Table 4.
| Functional zone residence time/h | Oxygen-eliminating area | Anaerobic zone | Aerobic zone | Facultative zone | Anoxic zone | Membrane pool |
| Example A | 0.52 | 1.96 | 3.55 | 1.66 | 4.28 | 2.2 |
| Functional zone residence time/h | Anaerobic zone | Anoxic zone | Aerobic zone | Posterior anoxic zone | Membrane pool | |
| Comparative example B | 1.85 | 3.27 | 5.26 | 1.59 | 2.2 |
Table 4 functional area pool volume
Referring to Table 5, application example A was run in AOA mode with a total reflux ratio of 100% -300%; the DO value of the aerobic zone is controlled to be 1.5-2.5 mg/L, the DO value of the membrane pool is controlled to be below 5.0mg/L, the average sludge concentration is 6000-8000 mg/L, the membrane operation flux is 18L/m < 2 >. H, and the aeration gas-water ratio is about 2:1 to 4:1, purge gas-water ratio 4:1 to 8:1.
the comparative example B operates in an AAO mode, and is matched with a post-anoxic carbon source, the total reflux ratio is 600-900%, wherein the membrane pool is refluxed to 300-400% of an aerobic zone, the aerobic zone is refluxed to 200-300% of an anoxic zone, and the anoxic zone is refluxed to 100-200% of an anaerobic zone; the DO value of the aerobic zone is controlled to be 2.0-3.0 mg/L, the DO value of the membrane pool is controlled to be below 5.0mg/L, the average sludge concentration is 6000-8000 mg/L, and other data are consistent with the application example A.
Table 5 actual average Water quality (mg/L) of inlet and outlet of sewage device
In the actual operation process, the application example A is not added with a carbon source, and the comparison example B is added with 50mg/L sodium acetate in a rear anoxic zone for supplementing the carbon source; application example A was dosed with phosphorus removal agent (PAC) 30mg/L and comparative example B was dosed with 75mg/L. The operation results show that under the condition of a certain total pool capacity, the COD, BOD, SS, TP of the application example A and the comparative example B have higher removal rates; wherein the COD and BOD concentration of the effluent of the application example A are slightly lower than those of the comparative example B, and the COD and BOD concentration may be related to the addition of a carbon source in the anoxic zone after the comparative example B; the concentration of effluent SS and TP of the comparative example B is slightly lower than that of the application example A, and the effluent standard requirements can be met.
In the aspect of removing nitrogen, according to the manual detection data of the along-path sampling, the ammonia nitrogen reaches the requirement of the effluent quality by applying the embodiment A to the tail end of the facultative zone 6; denitrification is carried out in the subsequent anoxic zone 7 by utilizing an internal carbon source, the sludge concentration is improved, and the total nitrogen at the anoxic terminal is lower than the final effluent quality data; in the membrane tank, the ammonia nitrogen concentration is further reduced, the total nitrogen concentration is slightly increased, and the denitrification effect is good under the condition that a carbon source is not added into the whole. The comparative example B shows good ammonia nitrogen removal effect when ammonia nitrogen reaches the requirement of effluent quality at the 3/4 pool capacity of the aerobic zone; in the aspect of total nitrogen, the front-end hypoxia is influenced by aerobic large-proportion backflow dissolved oxygen, so that the denitrification effect is poor, the total nitrogen removal rate is less than 50%, the total nitrogen is removed mainly by supplementing a carbon source through the rear-end hypoxia, and the overall denitrification effect is still good.
In terms of dephosphorization, both sets of devices require enhanced dephosphorization by chemical dephosphorization agents. The application example a was dosed in a smaller amount and the biological phosphorus removal effect was better than comparative example B because of the longer anaerobic residence time and the less dilution effect than comparative example B.
It can be seen that the application example A has advantages in denitrification and dephosphorization, and can ensure that the effluent ammonia nitrogen, TN and TP reach the standards under the conditions of no carbon source and little dephosphorization agent.
In summary, the sewage treatment system with the improved AOA technology coupled with MBR for high-efficiency denitrification and dephosphorization has the following advantages:
the utilization rate of the carbon source is high, a great amount of dissolved oxygen is generated by the MBR process conventionally through aeration, the carbon source is subjected to carbon oxidation in a longer aerobic zone 4, the carbon source is lost in an anoxic zone 7 due to the large reflux ratio, the energy consumption is high, and the denitrification effect is poor. According to the invention, through the modes of reducing reflux ratio, setting an oxygen-removing area 2, redistributing tank capacity ratio, low-oxygen aeration and the like, unnecessary consumption of carbon sources is avoided firstly, screening is performed in multiple carbon source utilization paths, denitrification dephosphorization with 'one carbon for multiple purposes' is enhanced, carbon oxidation paths with high mud yield and high energy consumption are avoided, the carbon sources are cooperatively and efficiently utilized, and the carbon source adding amount is reduced by 70% -100%.
The denitrification effect is excellent, the traditional AAO and the improved denitrification effect thereof are limited by the recovery flow ratio in theory, and the effect is influenced by various factors such as carbon source, dissolved oxygen of reflux liquid, temperature and the like in actual operation. The improved AOA process of the sectional water inflow is coupled with the MBR membrane separation process, firstly, the anoxic is postponed, and all nitrified nitrates enter the anoxic for denitrification, so that the adverse effects of energy consumption and dissolved oxygen caused by backflow are avoided, and the limitation of theoretical denitrification rate is avoided. The method can realize that the TN of the effluent is stably lower than 10mg/L and the TN of the normal effluent is stably lower than 5mg/L at low temperature on the basis of the water quality of BOD/TN=4 and COD/TN=2 with low carbon nitrogen ratio.
The energy consumption is low, and compared with the conventional MBR process, the total reflux quantity is reduced from 1000% to about 200%, and the energy consumption of a reflux pump is correspondingly reduced by 80%. The capacity of the aerobic tank is reduced, the aeration quantity is reduced, and the aeration energy consumption is reduced by about 30 percent; the membrane tank adopts pulse aeration, and the energy consumption is reduced by 10% -40%.
The medicine consumption is low, the carbon source utilization rate is high, and the carbon source is basically not required to be added during operation. The anaerobic zone 3 is prolonged, which is favorable for realizing denitrification dephosphorization effect, strengthens biological dephosphorization and reduces the addition of dephosphorization medicament. According to actual project data, the dephosphorization agent is reduced by 20% -60%.
The occupied area is small, the solid interception effect of the MBR technology brings high sludge concentration, and the treatment load is higher than that of the traditional activated sludge method. By improving the coupling of the AOA process and the second sludge reflux, the sludge concentration of the anoxic zone 7 is increased, so that a remarkable land-saving effect is achieved, and the total HRT of the whole process flow is only less than 60% of the HRT of the traditional sewage treatment process and less than 90% of the HRT of the MBR process.
The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (10)
1. The sewage treatment system for coupling MBR high-efficiency denitrification and dephosphorization by an improved AOA process is characterized in that: comprises a water inlet pipe, a water outlet pipe, an oxygen elimination zone (2), an anaerobic zone (3), an aerobic zone (4), a facultative zone (6), an anoxic zone (7), a membrane separation zone (9) and a sludge reflux component; the anaerobic zone (3), the aerobic zone (4), the facultative zone (6), the anoxic zone (7) and the membrane separation zone (9) are sequentially communicated; the water inlet pipe is communicated with the anaerobic zone (3) and the facultative zone (6), and the water outlet pipe is communicated with the membrane separation zone (9);
the sludge reflux assembly comprises a first sludge reflux pipe (13), a second sludge reflux pipe (14) and a third sludge reflux pipe; the two ends of the first sludge return pipe (13) are respectively communicated with the membrane separation area (9) and the oxygen elimination area (2), the two ends of the second sludge return pipe are respectively communicated with the membrane separation area (9) and the facultative area (6), and the two ends of the third sludge return pipe are respectively communicated with the oxygen elimination area (2) and the anaerobic area (3).
2. The improved AOA process coupled MBR sewage treatment system of claim 1 for efficient denitrification and dephosphorization, wherein:
the anaerobic zone (2), the anaerobic zone (3), the facultative zone (6) and the anoxic zone (7) are all provided with stirring devices.
3. The improved AOA process coupled MBR sewage treatment system of claim 1 for efficient denitrification and dephosphorization, wherein:
the device also comprises an aeration device arranged in the aerobic zone (4), wherein the aeration device comprises an aeration fan (24), an aeration pipeline and an aeration head;
the aeration head is arranged in the aerobic zone (4) and is connected with the aeration fan (24) through an aeration pipeline.
4. The improved AOA process coupled MBR sewage treatment system of claim 1 for efficient denitrification and dephosphorization, wherein:
the device also comprises a mud pump and a mud pipe;
the mud discharging pipe is communicated with the bottom of the membrane separation zone (9), and the mud discharging pump is arranged at the communication position of the mud discharging pipe and the membrane separation zone (9).
5. The improved AOA process coupled MBR high efficiency nitrogen and phosphorus removal wastewater treatment system of any one of claims 1-4, wherein:
the sludge reflux assembly further comprises a first sludge reflux pump and a second sludge reflux pump;
the first sludge reflux pump and the second sludge reflux pump are both arranged at the bottom of the membrane separation zone (9), the first sludge reflux pump is arranged at the communication position of the first sludge reflux pipe (13) and the membrane separation zone (9), and the second sludge reflux pump is arranged at the communication position of the second sludge reflux pipe (14) and the membrane separation zone (9).
6. The improved AOA process coupled MBR high efficiency nitrogen and phosphorus removal wastewater treatment system of any one of claims 1-4, wherein:
the sludge reflux assembly further comprises a third sludge reflux pump;
the third sludge reflux pump is arranged at the bottom of the membrane separation zone (9), and the first sludge reflux pipe (13) and the second sludge reflux pipe (14) are communicated with the third sludge reflux pump.
7. A sewage treatment method for efficiently denitrifying and dephosphorizing by coupling an improved AOA process with an MBR, which is realized by adopting the sewage treatment system for efficiently denitrifying and dephosphorizing by coupling an improved AOA process with an MBR as claimed in any one of claims 1 to 6, and is characterized by comprising the following steps of
Introducing sewage to be treated into an anaerobic zone (3) and a facultative zone (6) through the water inlet pipe, mixing the sewage introduced into the anaerobic zone (3) with sludge returned to the anaerobic zone (3) through a third sludge return pipe, and carrying out COD adsorption, internal carbon source conversion and phosphorus release reaction to cooperatively carry out denitrification dephosphorization;
introducing the sewage treated by the anaerobic zone (3) into an aerobic zone (4), and performing nitrification and phosphorus absorption reactions in the aerobic zone (4) to remove ammonia nitrogen and phosphorus in the sewage;
introducing the sewage treated by the aerobic zone (4) into a facultative zone (6), and performing low-dissolved oxygen synchronous nitrification and denitrification reaction in the facultative zone (6) to synchronously remove nitrogen; and the sludge returned to the facultative zone (6) through the second sludge return pipe (14) provides a carbon source for synchronous nitrification and denitrification of the facultative zone (6);
the sewage treated by the facultative zone (6) and the second sludge return pipe (14) return to the facultative zone (6) to be led into the anoxic zone (7), and the sewage is further denitrified and endogenous denitrified in the anoxic zone (7); after the sludge returned by the second sludge return pipe (14) flows into the anoxic zone (7), a carbon source is provided for denitrification of the anoxic zone (7); and part of raw water in the facultative zone (6) directly enters the anoxic zone (7) to provide an additional carbon source;
and (3) introducing the sewage treated by the anoxic zone (7) into a membrane separation zone (9), separating mud and water in the membrane separation zone (9), and then, refluxing one part of the bottom sludge to the anaerobic zone (3) through the oxygen elimination zone (2) and the other part to the facultative zone (6) to discharge the residual sludge.
8. The improved AOA process coupled MBR sewage treatment method of claim 7, wherein the method comprises the steps of:
the water inflow of the anaerobic zone (3) is distributed to 70% -100% in proportion, and the water inflow of the concurrently raising zone (6) is distributed to 0% -30% in proportion.
9. The improved AOA process coupled MBR sewage treatment method of claim 7, wherein the method comprises the steps of:
the reflux ratio of the sludge which flows back to the oxygen eliminating area (2) is 50-150 percent.
10. The improved AOA process coupled MBR sewage treatment method of claim 7, wherein the method comprises the steps of:
the reflux ratio of the sludge which flows back to the facultative zone (6) is 50-150 percent.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117486437A (en) * | 2024-01-03 | 2024-02-02 | 天津创业环保集团股份有限公司 | Denitrification and dephosphorization system and method suitable for high sludge concentration |
| CN117486437B (en) * | 2024-01-03 | 2024-04-12 | 天津创业环保集团股份有限公司 | Denitrification and dephosphorization system and method suitable for high sludge concentration |
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