CN113816566A - Urban sewage A2O-MBR combined nitrogen and phosphorus removal system - Google Patents

Urban sewage A2O-MBR combined nitrogen and phosphorus removal system Download PDF

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Publication number
CN113816566A
CN113816566A CN202111188848.8A CN202111188848A CN113816566A CN 113816566 A CN113816566 A CN 113816566A CN 202111188848 A CN202111188848 A CN 202111188848A CN 113816566 A CN113816566 A CN 113816566A
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tank
sludge
group
sewage
mbr
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CN113816566B (en
Inventor
陈婷婷
彭玉梅
钟亚萍
汪锐
邱恋
刘杨
熊兆锟
潘志成
罗荣林
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Sichuan Haitian Environmental Protection Energy Co ltd
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Sichuan Haitian Environmental Protection Energy Co ltd
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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
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • 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
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • 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
    • 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
    • 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
    • C02F3/302—Nitrification and denitrification treatment
    • 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)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)

Abstract

The invention discloses town sewage A2An O-MBR combined nitrogen and phosphorus removal system relates to the technical field of sewage treatment and comprises a grid pond, a water collecting adjusting pond, an MBR pond group, a primary sedimentation pond, an A pond and a filter pond which are sequentially arranged and communicated2An O tank group and a secondary sedimentation tank; the primary sedimentation tank is provided with a device for refluxing sludge in the primary sedimentation tank to the sludge A2A first sludge reflux mechanism of an aerobic tank in the O tank group; the secondary sedimentation tank is provided with a device for returning sludge in the secondary sedimentation tank to the sludge A2Second in group of O cellsSludge backflow mechanism. The invention discloses town sewage A2The O-MBR combined nitrogen and phosphorus removal system adopts an MBR tank group to divide the system into a phosphorus removal section and a nitrogen removal section, and three sludge ages exist in one system through two sludge backflow mechanisms, so that the sewage is subjected to phosphorus removal twice, a good phosphorus and nitrogen removal effect is achieved, and the contradiction of phosphorus accumulating bacteria, denitrifying bacteria and nitrifying bacteria on the sludge ages is solved.

Description

Urban sewage A2O-MBR combined nitrogen and phosphorus removal system
Technical Field
The invention relates to the technical field of town sewage treatment, in particular to town sewage A2An O-MBR combined nitrogen and phosphorus removal system.
Background
In recent years, with the rapid development of economy, the water consumption is increased, so that people face a severe problem of water resource shortage. Along with the rapid development of urbanization and industrialization, the urban water consumption is increased, and the sewage discharge amount is increased. In 2014, the total sewage discharge amount in China already reaches 7.16 multiplied by 1010Ton, but the current water treatment technology is relatively lagged, the sewage treatment rate is low, the sewage which is treated to reach the standard or is not treated is directly discharged to the natural environment, and the natural water environment deterioration phenomenon is frequent. Eutrophication of water is a phenomenon of water environment deterioration, and the root cause of eutrophication of water is that more and more nutrient salts (such as nitrogen and phosphorus) are discharged into water and exceed the bearing capacity of water. Therefore, enhancing the removal of nitrogen and phosphorus in sewage has become an important target for sewage treatment.
The biological sewage treating process is one method of eliminating organic pollutant from sewage with the metabolism of microbe, and has low cost, simple operation and high treating effect on sewage of great flow rate and low concentration.
Towns are places with highly concentrated population density, and thus the amount of sewage discharged in daily life is huge. Compared with sewage generated in the production process, the urban domestic sewage has much lower pollutant content than the production sewage, and a good sewage treatment effect is difficult to achieve by adopting the traditional sewage treatment technology, so the sewage biological treatment method becomes the first choice for urban domestic sewage treatment.
Because the nitrogen and phosphorus contents in the town sewage are higher, the nitrogen and phosphorus removal of the sewage becomes a research hotspot of the town sewage treatment at the present stage.
The biological denitrification of the sewage mainly comprises the steps of decomposing ammonia nitrogen in the sewage into harmless nitrogen through a nitrification-denitrification process; the biological phosphorus removal of the sewage is mainly realized by absorbing phosphorus in the sewage through phosphorus accumulating bacteria. In biological wastewater treatment processes, these two processes are usually performed simultaneously. However, because the phosphorus-accumulating bacteria and the nitrifying bacteria have different requirements on sludge age and different requirements on oxygen, the phosphorus removal effect of the sewage is not ideal when good denitrification effect is ensured.
Disclosure of Invention
Aiming at the prior art, the invention provides town sewage A2The O-MBR combined nitrogen and phosphorus removal system firstly removes and nitrifies the sewage by the MBR and then passes through the A2And the O is subjected to denitrification treatment, so that the circulation path of phosphorus-accumulating bacteria sludge is shortened, the sludge age of the MBR is short, and the phosphorus removal effect is improved, so that the system has a good phosphorus removal effect while the sewage denitrification effect is ensured.
The invention is realized by the following technical scheme: urban sewage A2The O-MBR combined nitrogen and phosphorus removal system comprises a grid tank, a water collecting adjusting tank, an MBR tank group, a primary sedimentation tank and an A tank which are sequentially arranged and communicated2An O tank group and a secondary sedimentation tank; the primary sedimentation tank is provided with a device for refluxing sludge in the primary sedimentation tank to the sludge A2A first sludge reflux mechanism of an aerobic tank in the O tank group; the secondary sedimentation tank is provided with a device for returning sludge in the secondary sedimentation tank to the sludge A2And a second sludge backflow mechanism in the O tank group.
A is described2The O-shaped battery pack comprises a plurality of groups which are connected in sequenceAn anoxic tank, an anaerobic tank and an aerobic tank. The anoxic tank is connected with the primary sedimentation tank, and the aerobic tank is connected with the secondary sedimentation tank.
The water inlet end of the grating pool is provided with a coarse grating, and the water outlet end of the grating pool is provided with a fine grating, so that massive solid pollutants in the sewage are filtered out. Because the discharge amount of the town sewage is unstable, the water collecting and regulating tank collects the town sewage and then uniformly allocates the collected town sewage, so that the problem that the quality of the effluent water of the system fluctuates greatly due to overlarge sewage treatment fall in the system is avoided. An MBR membrane module and an aeration device for sewage aeration are arranged in the MBR tank group; a is described2An aeration device for sewage aeration is also arranged in the aerobic tank in the O tank group. As the phosphorus accumulating bacteria take oxygen as an electron acceptor to absorb phosphorus in the sewage in the form of polyphosphate, the phosphorus removing effect is achieved. A large amount of sludge in the sewage is removed through the sewage of the MBR membrane module, and the sludge containing a large amount of phosphorus-accumulating bacteria is left in the MBR tank group to continuously and repeatedly absorb and remove phosphorus elements in the sewage, so that a good phosphorus removal effect is achieved. Meanwhile, the sludge settled in the primary sedimentation tank contains a large amount of phosphorus-accumulating bacteria, and the sludge containing a large amount of phosphorus-accumulating bacteria is refluxed to A through a first sludge reflux mechanism2And an aerobic tank in the O tank group is used for further dephosphorization treatment of the sewage after denitrification treatment, so that a good dephosphorization effect is achieved.
The deposited sludge in the secondary sedimentation tank flows back to the A tank because the sludge age of the sludge is longer as required by the microorganisms in the nitrification-denitrification process2And carrying out nitrification-denitrification in the O tank group.
Further, the MBR tank group comprises an aeration tank and an MBR membrane tank which are communicated with each other; the MBR membrane tank is provided with a third sludge backflow mechanism which enables the MBR membrane tank to flow back to the aeration tank, the aeration tank is connected with the water collection regulating tank, and the MBR membrane tank is connected with the primary sedimentation tank.
And an aeration device in the MBR tank group is arranged in the aeration tank to aerate the sewage and provide oxygen for phosphorus accumulating bacteria and nitrifying bacteria in the sludge. The third sludge backflow mechanism forms rapid sludge circulation backflow between the aeration tank and the MBR membrane tank, so that phosphate accumulating bacteria and nitrifying bacteria in the sludge keep dominant strains, and good phosphorus removal and ammonia nitrogen nitrification effects are achieved.
Further, A is2The group of O cells comprises a first A connected in parallel2Group of cells and second A2O, a pool group; the first A2Group of cells and second A2The O-tank group is respectively communicated with a primary sedimentation tank and a secondary sedimentation tank to realize A2The parallel denitrification sections of the O-tank groups shorten the hydraulic retention time of sewage in the system and improve the sewage treatment capacity of the system.
Further, the first A2The O-tank group comprises a first anoxic tank, a first anaerobic tank and a first aerobic tank which are sequentially arranged, wherein the first anoxic tank is connected with the primary sedimentation tank, and the first aerobic tank is communicated with the secondary sedimentation tank; the second A2The O-tank group comprises a second anoxic tank, a second anaerobic tank and a second aerobic tank which are sequentially arranged, wherein the second anoxic tank is connected with the primary sedimentation tank, and the second aerobic tank is connected with the secondary sedimentation tank; the second sludge backflow mechanism respectively and equivalently reflows the sludge in the second sedimentation tank to the first anoxic tank and the second anoxic tank; the first sludge backflow mechanism enables sludge in the first sedimentation tank to flow back to the first aerobic tank and the second aerobic tank in an equivalent manner respectively.
Further, the first A2O batteries and/or second A2The O-shaped pool group is provided with an auxiliary flow pipeline communicated with the water collecting adjusting pool. Because the fluctuation of the pollutant content in the urban sewage is large and the fluctuation of the sewage discharge is also large, when the content of ammonia nitrogen and phosphorus in the sewage is obviously increased, the sewage is subjected to MBR pool group and A2The sewage treated by the O-tank group still can not meet the requirements of denitrification and dephosphorization of the sewage, and at the moment, the auxiliary flow pipeline can be opened to circulate the sewage to the water collecting adjusting tank again to participate in the second sewage treatment, so that the sewage discharged after the system treatment reaches the discharge standard. Meanwhile, under the condition of large instantaneous fluctuation of sewage discharge, the auxiliary flow pipeline can keep the sewage in the system in a certain range all the time, so that the stable operation of the system is ensured, and the sludge activity is not influenced.
Further, the first A2The O-tank group is provided with a return pipeline which returns from the first aerobic tank to the first anoxic tank; the second A2The O-shaped pool group is provided with a secondary aerobic poolReflowing to the reflow pipeline of the second anoxic pond, when the ammonia nitrogen content in the sewage is higher, the first A2Group of cells and second A2The O-tank group forms circular reflux to the sewage discharged from the first aerobic tank and the second aerobic tank, so that the ammonia nitrogen discharge standard can be met, and the denitrification treatment of the sewage is realized.
Furthermore, the aeration tank, the first aerobic tank and the second aerobic tank adopt multi-point water inflow, so that sewage in the aeration tank, the first aerobic tank and the second aerobic tank is quickly and uniformly aerated, and a good aeration effect is achieved.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the invention provides town sewage A2The O-MBR combined nitrogen and phosphorus removal system adopts an MBR tank group to divide the system into a phosphorus removal section and a nitrogen removal section, and three sludge ages exist in one system through two sludge backflow mechanisms, so that the sewage is subjected to phosphorus removal twice, a good phosphorus and nitrogen removal effect is achieved, and the contradiction of phosphorus accumulating bacteria, denitrifying bacteria and nitrifying bacteria on the sludge ages is solved.
(2) The invention provides town sewage A2The O-MBR combined nitrogen and phosphorus removal system is also provided with a first A connected in parallel2Group of cells and second A2The O-tank group is used as a denitrification section, so that the hydraulic retention time of sewage in the system is shortened, and the sewage treatment capacity of the system is improved.
(3) The invention provides town sewage A2The O-MBR combined nitrogen and phosphorus removal system is also provided with a first A for sewage2O batteries and/or second A2The O-tank group flows back to the auxiliary flow pipeline of the water collecting and adjusting tank, so that the system can adjust the pollutant content and discharge fluctuation of the town sewage, and the stable operation and sewage treatment effect of the system are ensured.
Drawings
FIG. 1 is a schematic structural view of the present invention;
wherein: wherein: 1-grid tank, 2-water collecting and adjusting tank, 3-MBR tank group, 31-aeration tank, 32-MBR membrane tank, 4-primary sedimentation tank, and 5-A2Series of O cells, 51-first A2An O-tank group, 511-a first anoxic tank, 512-a first anaerobic tank,513-first aerobic tank, 52-second A2The device comprises an O-tank group, 521-a second anoxic tank, 522-a second anaerobic tank, 523-a second aerobic tank, 6-a secondary sedimentation tank, 7-a first sludge backflow mechanism, 8-a second sludge backflow mechanism, 9-a third sludge backflow mechanism, 10-an auxiliary flow pipeline and 11-a backflow pipeline.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
In the invention, the first sludge backflow mechanism 7, the second sludge backflow mechanism 8 and the third sludge backflow mechanism 9 respectively comprise a sludge discharge pipe for collecting sludge, a sludge pump for lifting sludge and a sludge backflow pipe for backflow of sludge, and the sludge backflow pipes are respectively provided with a flowmeter for monitoring the flow rate of the sludge. The first sludge backflow mechanism 7, the second sludge backflow mechanism 8 and the third sludge backflow mechanism 9 are all existing sludge backflow mechanisms, so that detailed description is omitted, and understanding and implementation of technical schemes of the invention by technicians in the field are not affected.
Example 1
As shown in figure 1, a town sewage A2The O-MBR combined nitrogen and phosphorus removal system comprises a grid tank 1, a water collecting adjusting tank 2, an MBR tank group 3, a primary sedimentation tank 4 and an A tank which are sequentially arranged and communicated2An O-tank group 5 and a secondary sedimentation tank 6; the primary sedimentation tank 4 is provided with a device for refluxing sludge in the primary sedimentation tank 4 to A2A first sludge reflux mechanism 7 of an aerobic tank in the O tank group 5; the secondary sedimentation tank 6 is provided with a device for returning the sludge in the secondary sedimentation tank 6 to the A2And a second sludge backflow mechanism 8 in the O-shaped tank group 5.
A is described2The O-tank group 5 comprises an anoxic tank, an anaerobic tank and an aerobic tank which are connected in sequence. The anoxic tank is connected with the primary sedimentation tank 4, and the aerobic tank is connected with the secondary sedimentation tank 6.
The water inlet end of the grating pool 1 is provided with a coarse grating, and the water outlet end of the grating pool 1 is provided with a fine grating, so that massive solid pollutants in the sewage are filtered out. Because the discharge amount of the town sewage is unstable, the water collecting and regulating tank 2 collects the town sewage and then uniformly allocates the collected sewage,the problem that the quality of effluent of the system fluctuates too much due to overlarge drop of sewage treatment capacity in the system is avoided. An MBR membrane module and an aeration device for sewage aeration are arranged in the MBR tank group 3; a is described2An aeration device for sewage aeration is also arranged in the aerobic tank in the O-tank group 5. As the phosphorus accumulating bacteria take oxygen as an electron acceptor to absorb phosphorus in the sewage in the form of polyphosphate, the phosphorus removing effect is achieved. The sewage passing through the MBR membrane module removes a large amount of sludge in the sewage, and the sludge containing a large amount of phosphorus-accumulating bacteria is left in the MBR tank group 3 to continuously and repeatedly absorb and remove phosphorus elements in the sewage, so that a good phosphorus removal effect is achieved. Meanwhile, the sludge settled in the primary sedimentation tank 4 contains a large amount of phosphorus-accumulating bacteria, and the sludge containing a large amount of phosphorus-accumulating bacteria is refluxed to A through a first sludge reflux mechanism 72And an aerobic tank in the O-tank group 5 is used for further dephosphorization treatment of the denitrified sewage to achieve a good dephosphorization effect.
The deposited sludge in the secondary sedimentation tank 6 is returned to A due to the sludge age required by the microorganisms in the nitrification-denitrification process2And carrying out nitrification-denitrification in the O tank group 5.
The MBR membrane module is a tubular membrane module, a flat plate membrane module and a hollow fiber type membrane module which are sold in the market, and preferably is a flat plate membrane module.
The MBR tank group 3 comprises an aeration tank 31 and an MBR membrane tank 32 which are communicated with each other; the MBR membrane tank 32 is provided with a third sludge backflow mechanism 9 which enables the MBR membrane tank 32 to flow back to the aeration tank 31, the aeration tank 31 is connected with the water collecting and adjusting tank 2, and the MBR membrane tank 32 is connected with the primary sedimentation tank 4.
The aeration device in the MBR tank group 3 is arranged in the aeration tank 31 and is used for aerating the sewage and providing oxygen for phosphorus accumulating bacteria and nitrifying bacteria in the sludge. The third sludge backflow mechanism 9 forms rapid sludge circulation backflow between the aeration tank 31 and the MBR membrane tank 32, so that the phosphorus accumulating bacteria and the nitrifying bacteria in the sludge keep dominant strains, and good phosphorus removal and ammonia nitrogen nitrification effects are achieved.
And the sludge age in the MBR tank group 3 is kept at 4-8 days. Within the range, the phosphorus accumulating bacteria and the nitrifying bacteria can be massively propagated into dominant bacteria. Phosphorus accumulating bacteria for accumulatingPhosphorus in the sewage is absorbed in the form of phosphate, meanwhile, nitrifying bacteria carry out nitration reaction on the sewage, so that part of ammonia nitrogen in the sewage is oxidized into nitrite or nitrate which is A2The denitrification reactions in the anoxic tank and the anaerobic tank in the O-tank 5 provide nitrite and nitrate.
Example 2
The embodiment is improved on the basis of embodiment 1, and the improvement is as follows: a is described2 Group 5 of O cells comprising a first A in parallel2 O cell group 51 and second A2O-cell group 52; the first A2 O cell group 51 and second A2The O-tank group 52 is respectively communicated with the primary sedimentation tank 4 and the secondary sedimentation tank 6 to realize A2The parallel denitrification sections of the O-tank group 5 shorten the hydraulic retention time of sewage in the system and improve the sewage treatment capacity of the system.
Further, the first A2The O-tank group 51 comprises a first anoxic tank 511, a first anaerobic tank 512 and a first aerobic tank 513 which are sequentially arranged, wherein the first anoxic tank 511 is connected with the primary sedimentation tank 4, and the first aerobic tank 513 is communicated with the secondary sedimentation tank 6; the second A2The O-tank group 52 comprises a second anoxic tank 521, a second anaerobic tank 522 and a second aerobic tank 523, which are sequentially arranged, wherein the second anoxic tank 521 is connected with the primary sedimentation tank 4, and the second aerobic tank 523 is connected with the secondary sedimentation tank 6; the second sludge backflow mechanism 8 is used for respectively and equivalently backflow sludge in the secondary sedimentation tank 6 to the first anoxic tank 511 and the second anoxic tank 521; the first sludge reflux mechanism 7 respectively and equivalently reflows the sludge in the primary sedimentation tank 4 to the first aerobic tank 513 and the second aerobic tank 523.
Other parts in this embodiment are substantially the same as those in embodiment 1, and thus are not described in detail.
Example 3
The embodiment is improved on the basis of the embodiment 2, and the improvement is as follows: the first A2O pool 51 and/or second A2The O-cell group 52 is provided with an auxiliary flow pipe 10 communicating with the catchment regulation tank 2. Because the fluctuation of the pollutant content in the urban sewage is large and the fluctuation of the sewage discharge is also large, when the content of ammonia nitrogen and phosphorus in the sewage is obviously increased, the sewage passes through the MBR tank group 3 and A2 O tank 5 treatmentThe sewage still can not meet the requirements of nitrogen and phosphorus removal of the sewage, the auxiliary flow pipeline 10 can be opened at the moment, the sewage is circulated to the water collecting regulating tank 2 again to participate in the second sewage treatment, and the sewage discharged after the system treatment reaches the discharge standard. Meanwhile, under the condition of large instantaneous fluctuation of sewage discharge, the auxiliary flow pipeline 10 can keep the sewage in the system in a certain range all the time, so that the stable operation of the system is ensured, and the sludge activity is not influenced.
Other parts in this embodiment are substantially the same as those in embodiment 2, and thus are not described in detail.
Example 4
The embodiment is improved on the basis of the embodiment 2 or 3, and the improvement is that: the first A2The O-tank group 51 is provided with a return pipe 11 which returns from the first aerobic tank 513 to the first anoxic tank 511; the second A2The O-tank group 52 is provided with a return pipeline 11 which returns from the second aerobic tank 523 to the second anoxic tank 521, and when the content of ammonia nitrogen in the sewage is higher, the first A tank is connected with the second anoxic tank 5212 O cell group 51 and second A2The O-tank group 52 forms a circulating reflux to the first aerobic tank 513 and the second aerobic tank 523 to discharge sewage which can reach the ammonia nitrogen discharge standard, so that the denitrification treatment of the sewage is realized.
Preferably, the aeration tank 31, the first aerobic tank 513 and the second aerobic tank 523 adopt multi-point water inflow, so that sewage in the aeration tank 31, the first aerobic tank 513 and the second aerobic tank 523 is quickly and uniformly aerated to achieve a good aeration effect.
Other parts in this embodiment are substantially the same as those in embodiment 2 or 3, and therefore are not described in detail.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.

Claims (7)

1. Urban sewage A2The O-MBR combined nitrogen and phosphorus removal system is characterized in that: comprises a grid pool (1), a water collecting adjusting pool (2) and a water collecting tank which are arranged and communicated in sequence,MBR pool group (3), primary sedimentation tank (4) and A2An O-tank group (5) and a secondary sedimentation tank (6); the primary sedimentation tank (4) is provided with a device for returning sludge in the primary sedimentation tank (4) to the A2A first sludge reflux mechanism (7) of an aerobic tank in the O tank group (5); the secondary sedimentation tank (6) is provided with a device for returning sludge in the secondary sedimentation tank (6) to the A2A second sludge reflux mechanism (8) in the O-tank group (5).
2. The town sewage A as claimed in claim 12The O-MBR combined nitrogen and phosphorus removal system is characterized in that: the MBR tank group (3) comprises an aeration tank (31) and an MBR membrane tank (32) which are communicated with each other; the MBR membrane tank (32) is provided with a third sludge backflow mechanism (9) which enables the MBR membrane tank (32) to flow back to the aeration tank (31), the aeration tank (31) is connected with the water collection regulating tank (2), and the MBR membrane tank (32) is connected with the primary sedimentation tank (4).
3. The town sewage A as claimed in claim 22The O-MBR combined nitrogen and phosphorus removal system is characterized in that: a is described2The group of O cells (5) comprises a first A connected in parallel2O a battery (51) and a second A2An O cell group (52); the first A2O a battery (51) and a second A2The O-tank group (52) is respectively communicated with the primary sedimentation tank (4) and the secondary sedimentation tank (6).
4. The town sewage A as claimed in claim 32The O-MBR combined nitrogen and phosphorus removal system is characterized in that: the first A2The O-tank group (51) comprises a first anoxic tank (511), a first anaerobic tank (512) and a first aerobic tank (513) which are sequentially arranged, the first anoxic tank (511) is connected with the primary sedimentation tank (4), and the first aerobic tank (513) is communicated with the secondary sedimentation tank (6); the second A2The O-tank group (52) comprises a second anoxic tank (521), a second anaerobic tank (522) and a second aerobic tank (523), which are sequentially arranged, wherein the second anoxic tank (521) is connected with the primary sedimentation tank (4), and the second aerobic tank (523) is connected with the secondary sedimentation tank (6); the second sludgeThe return mechanism (8) respectively returns the sludge in the secondary sedimentation tank (6) to the first anoxic tank (511) and the second anoxic tank (521) in equal amount; the first sludge backflow mechanism (7) enables sludge in the primary sedimentation tank (4) to flow back to the first aerobic tank (513) and the second aerobic tank (523) in an equivalent manner respectively.
5. The town sewage A as claimed in claim 42The O-MBR combined nitrogen and phosphorus removal system is characterized in that the first A2O a battery (51) and/or a second A2The O-shaped pool group (52) is provided with an auxiliary flow pipeline (10) communicated with the water collecting adjusting pool (2).
6. The town sewage A as claimed in claim 42The O-MBR combined nitrogen and phosphorus removal system is characterized in that: the first A2The O-tank group (51) is provided with a return pipeline (11) which returns from the first aerobic tank (513) to the first anoxic tank (511); the second A2The O-tank group (52) is provided with a return pipeline (11) which returns from the second aerobic tank (523) to the second anoxic tank (521).
7. The town sewage A as claimed in any one of claims 4 to 62The O-MBR combined nitrogen and phosphorus removal system is characterized in that: the aeration tank (31), the first aerobic tank (513) and the second aerobic tank (523) adopt multi-point water inflow.
CN202111188848.8A 2021-10-12 2021-10-12 Urban sewage A 2 O-MBR combined denitrification and dephosphorization system Active CN113816566B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

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