CN113233709A - Non-membrane treatment method and system for domestic sewage - Google Patents

Non-membrane treatment method and system for domestic sewage Download PDF

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Publication number
CN113233709A
CN113233709A CN202110579786.7A CN202110579786A CN113233709A CN 113233709 A CN113233709 A CN 113233709A CN 202110579786 A CN202110579786 A CN 202110579786A CN 113233709 A CN113233709 A CN 113233709A
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tank
anaerobic
denitrification
domestic sewage
anoxic
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崔秀文
张严
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Xiamen Central Water Technology Co ltd
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Xiamen Central Water Technology Co ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/001Processes for the treatment of water whereby the filtration technique is of importance
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F2001/007Processes including a sedimentation step
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/105Phosphorus compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/16Nitrogen compounds, e.g. ammonia
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/04Disinfection
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • C02F3/308Biological phosphorus removal
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/34Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F7/00Aeration of stretches of water

Abstract

The invention discloses a domestic sewage non-membrane treatment method and a system, wherein the system part comprises a water collecting tank, a pre-denitrification tank, an anaerobic tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank and a BAF tank; the sewage treatment device is characterized in that a sewage lifting pump is arranged in the water collecting tank and used for lifting domestic sewage in the water collecting tank to a pre-denitrification tank, the anaerobic tank is connected with the pre-denitrification tank and used for degrading CODCr and BOD5 in the domestic sewage after preliminary denitrification in the pre-denitrification tank and phosphorus-accumulating bacteria biological phosphorus release, the anoxic tank is connected with the anaerobic tank and used for carrying out denitrification and CODCr degradation on the domestic sewage flowing out of the anaerobic tank, the effluent of the anoxic tank enters the aerobic tank, the effluent of the aerobic tank enters the secondary sedimentation tank for solid-liquid separation, and the liquid after secondary sedimentation tank separation is discharged after being discharged into the BAF tank. High nitrogen and phosphorus removal efficiency, good treatment effect, low energy consumption, small amount of residual sludge, one-time investment saving, low operating cost, simple and convenient operation and management, small maintenance workload and the like.

Description

Non-membrane treatment method and system for domestic sewage
Technical Field
The invention is applied to the field of sewage treatment, and particularly relates to a domestic sewage non-membrane treatment method and system.
Background
Most of the existing domestic sewage treatment modes are membrane treatment processes, but the membrane treatment processes have the following defects: the membrane treatment process needs to replace the membrane once in 1 to 3 years, and the replacement cost is high. Membrane cleaning is cumbersome and is not basically feasible for buried sewage treatment facilities. The price of a matched air blower is higher in the membrane process, and the power consumption is higher.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a domestic sewage non-membrane treatment method and system.
In order to solve the technical problem, the non-membrane treatment method for domestic sewage comprises the following steps:
s1, inputting the water body to be treated into the grid and the grit chamber for water body pretreatment;
s2, inputting the pretreated water body into a water collecting tank and a regulating tank, lifting the water body to a pre-denitrification tank by a sewage lifting pump to perform anaerobic ammonia oxidation reaction so as to primarily remove nitrogen;
s3, conveying the water body in the pre-denitrification pool to an anaerobic pool, degrading CODCr and BOD5 in the water body and biologically releasing phosphorus by phosphorus accumulating bacteria;
s4, conveying the water body in the anaerobic tank to an anoxic tank, and performing denitrification and CODCr degradation on the water body;
s5, conveying the water body treated by the anoxic tank to an aerobic tank, wherein the aerobic tank adopts an MBBR process to treat the structures of pollutants in the water;
s6, discharging the effluent of the aerobic tank into a secondary sedimentation tank for solid-liquid separation, returning a part of the sludge separated by the secondary sedimentation tank to a pre-denitrification tank through a return pipe and a return pump, and discharging the residual sludge and the fallen biomembrane into a sludge tank for sludge dewatering or outward transportation treatment;
s7, discharging the effluent of the secondary sedimentation tank into a BAF tank, further degrading COD and BOD in the water body and further denitrifying;
and S8, performing sand filtration and disinfection treatment on the effluent of the BAF pool, and discharging the effluent after reaching the standard.
A domestic sewage non-membrane treatment system comprises a water collecting tank, a pre-denitrification tank, an anaerobic tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank and a BAF tank;
the sewage treatment device is characterized in that a sewage lifting pump is arranged in the water collecting tank and used for lifting domestic sewage in the water collecting tank to a pre-denitrification tank, the pre-denitrification tank is used for enabling life to be subjected to anaerobic ammonia oxidation reaction to primarily remove nitrogen, the anaerobic tank is connected with the pre-denitrification tank and used for degrading CODCr and BOD5 in the domestic sewage after the primary nitrogen removal in the pre-denitrification tank and phosphorus-accumulating bacteria biological phosphorus release, the anoxic tank is communicated with the upper end of the anaerobic tank, a water body in the anaerobic tank flows into the anoxic tank after overflowing, the anoxic tank is used for performing denitrification and CODCr degradation on the domestic sewage flowing out of the anaerobic tank, effluent of the anoxic tank enters the aerobic tank, effluent of the aerobic tank enters the secondary sedimentation tank to perform solid-liquid separation, and liquid after the secondary sedimentation tank is discharged after being discharged into the BAF tank.
As a possible implementation mode, the system further comprises an adjusting tank, when the domestic sewage introduced into the collecting tank has a large change coefficient Kz, the adjusting tank is arranged between the collecting tank and the pre-denitrification tank, and water in the collecting tank is lifted and discharged into the pre-denitrification tank after being discharged into the adjusting tank.
As a possible implementation mode, the air conditioner further comprises an air blower, wherein the air outlet of the air blower is connected with a plurality of groups of air outlet branch pipes, the air outlet branch pipes are respectively connected with aeration pipes arranged at the bottoms of the regulating tank, the aerobic tank and the BAF tank, and the air blower provides air for the regulating tank, the aerobic tank and the BAF tank through the air outlet branch pipes and the aeration pipes.
As a possible embodiment, the microorganisms in the pre-denitrification tank, the anaerobic tank and the anoxic tank are all in an anaerobic state.
As a possible embodiment, further, the process form of the anaerobic tank can take the following steps: UASB, IC, ABR, anaerobic biofilter, anaerobic contact method, anaerobic fluidized bed or anaerobic rotating biological disk.
As a possible embodiment, further, the dissolved oxygen in the anoxic pond ranges from 0.45mg/L to 0.55 mg/L.
As a possible implementation mode, further, the aerobic tank takes the form of an MBBR process, and mixed liquor in the aerobic tank is pumped out to the anoxic tank through a return pipe and a return pump for retreatment.
As a possible implementation mode, further, a part of the sludge separated in the secondary sedimentation tank flows back to the pre-denitrification tank through a return pipe and a return pump, and the residual sludge and the fallen biological membranes are discharged into the sludge tank to be treated by sludge dewatering or outward transportation.
As a possible implementation mode, microorganisms in the BAF pond further degrade COD and BOD, denitrify and remove SS, and the discharged water of the BAF pond is subjected to sand filtration and disinfection treatment and then is discharged after reaching the standard.
As a possible implementation mode, the system further comprises a grid and a grit chamber, wherein the grid and the grit chamber are arranged in front of the collecting tank and used for pre-treating and filtering the domestic sewage before entering the collecting tank.
By adopting the technical scheme, the invention has the following beneficial effects:
the invention has the advantages of high nitrogen and phosphorus removal efficiency, good treatment effect, low energy consumption, small amount of residual sludge, one-time investment saving, low operation cost, simple and convenient operation and management, small maintenance workload and the like.
Drawings
The invention is described in further detail below with reference to the following figures and embodiments:
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described in detail and completely with reference to the accompanying drawings.
As shown in figure 1, the invention provides a domestic sewage non-membrane treatment method, which comprises the following steps:
s1, inputting the water body to be treated into the grid and the grit chamber for water body pretreatment;
s2, inputting the pretreated water body into a water collecting tank and a regulating tank, lifting the water body to a pre-denitrification tank by a sewage lifting pump to perform anaerobic ammonia oxidation reaction so as to primarily remove nitrogen;
s3, conveying the water body in the pre-denitrification pool to an anaerobic pool, degrading CODCr and BOD5 in the water body and biologically releasing phosphorus by phosphorus accumulating bacteria;
s4, conveying the water body in the anaerobic tank to an anoxic tank, and performing denitrification and CODCr degradation on the water body;
s5, conveying the water body treated by the anoxic tank to an aerobic tank, wherein the aerobic tank adopts an MBBR process to treat the structures of pollutants in the water;
s6, discharging the effluent of the aerobic tank into a secondary sedimentation tank for solid-liquid separation, returning a part of the sludge separated by the secondary sedimentation tank to a pre-denitrification tank through a return pipe and a return pump, and discharging the residual sludge and the fallen biomembrane into a sludge tank for sludge dewatering or outward transportation treatment;
s7, discharging the effluent of the secondary sedimentation tank into a BAF tank, further degrading COD and BOD in the water body and further denitrifying;
and S8, performing sand filtration and disinfection treatment on the effluent of the BAF pool, and discharging the effluent after reaching the standard.
A domestic sewage non-membrane treatment system comprises a water collecting tank, a pre-denitrification tank, an anaerobic tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank and a BAF tank;
the sewage treatment device is characterized in that a sewage lifting pump is arranged in the water collecting tank and used for lifting domestic sewage in the water collecting tank to a pre-denitrification tank, the pre-denitrification tank is used for enabling life to be subjected to anaerobic ammonia oxidation reaction to primarily remove nitrogen, the anaerobic tank is connected with the pre-denitrification tank and used for degrading CODCr and BOD5 in the domestic sewage after the primary nitrogen removal in the pre-denitrification tank and phosphorus-accumulating bacteria biological phosphorus release, the anoxic tank is communicated with the upper end of the anaerobic tank, a water body in the anaerobic tank flows into the anoxic tank after overflowing, the anoxic tank is used for performing denitrification and CODCr degradation on the domestic sewage flowing out of the anaerobic tank, effluent of the anoxic tank enters the aerobic tank, effluent of the aerobic tank enters the secondary sedimentation tank to perform solid-liquid separation, and liquid after the secondary sedimentation tank is discharged after being discharged into the BAF tank. The process form of the anaerobic tank can adopt the following steps: UASB, IC, ABR, anaerobic biofilter, anaerobic contact method, anaerobic fluidized bed or anaerobic rotating biological disk. The domestic sewage treatment device further comprises a grid and a grit chamber, wherein the grid and the grit chamber are arranged in front of the water collecting tank and used for pretreating and filtering domestic sewage before entering the water collecting tank. The domestic sewage treatment device further comprises an adjusting tank, the domestic sewage change coefficient Kz introduced into the collecting tank is large, the adjusting tank is arranged between the collecting tank and the pre-denitrification tank, and water in the collecting tank is discharged into the adjusting tank and then is lifted and discharged into the pre-denitrification tank. (generally speaking, the coefficient of variation Kz of the domestic sewage with small water volume is large, an adjusting tank is needed to be arranged, and the coefficient of variation Kz of the domestic sewage with large water volume is small, and only a collecting tank can be arranged).
As a possible implementation mode, the air conditioner further comprises an air blower, wherein the air outlet of the air blower is connected with a plurality of groups of air outlet branch pipes, the air outlet branch pipes are respectively connected with aeration pipes arranged at the bottoms of the regulating tank, the aerobic tank and the BAF tank, and the air blower provides air for the regulating tank, the aerobic tank and the BAF tank through the air outlet branch pipes and the aeration pipes. And the microorganisms in the pre-denitrification tank, the anaerobic tank and the anoxic tank are all in an anaerobic state. Furthermore, the dissolved oxygen range of the anoxic pond is 0.45mg/L-0.55 mg/L. Furthermore, the aerobic tank adopts an MBBR process form, and mixed liquor in the aerobic tank is pumped out to the anoxic tank through a return pipe and a return pump for retreatment. (the aerobic tank can also select the process forms of a contact oxidation method, SBR, CASS, UNITANK, an oxidation ditch, an aeration biological filter and the like). MBBR (Moving Bed Biofilm Reactor) is a Moving Bed Biofilm Reactor (Moving Bed Biofilm Reactor) which increases the biomass and the biological species in a Reactor by adding a certain amount of suspension carriers into the Reactor, thereby improving the treatment efficiency of the Reactor. As the density of the filler is close to that of water, the filler is completely mixed with the water during aeration, and the environment for the growth of microorganisms is three phases of gas, liquid and solid. The collision and shearing action of the carrier in water makes air bubbles finer, and the utilization rate of oxygen is increased. In addition, each carrier has different biological species inside and outside, anaerobic bacteria or facultative bacteria grow inside, aerobic bacteria grow outside, each carrier is a micro-reactor, and nitrification reaction and denitrification reaction exist at the same time, so that the treatment effect is improved. The MBBR technology has the advantages of both a traditional fluidized bed and a biological contact oxidation method, is a novel efficient sewage treatment method, ensures that a carrier is in a fluidized state by means of aeration in an aeration tank and the lifting action of water flow, further forms activated sludge for suspension growth and a biomembrane for attachment growth, so that the biomembrane for the moving bed uses the space of the whole reactor, fully exerts the advantages of both attachment phase and suspension phase organisms, makes the organisms benefit from the advantages of both attachment phase and suspension phase organisms, and supplements each other.
The sludge precipitated in the secondary sedimentation tank can be mixed with part of the settled microorganisms, and in order to effectively and reasonably utilize the microorganisms in the sludge, part of the sludge can be refluxed so as to carry out secondary utilization on the microorganisms. Multiple tests in the actual production process prove that the microorganisms with stronger activity are generally enriched at the boundary between the top of the sludge and water (the anoxic section is arranged here and has stronger fluidity), so that the microorganisms can be recycled by refluxing part of the sludge on the top of the sludge. Preferably, the return flow of the sludge is 1-5% of the total volume of the sludge. More preferably, the return flow of the sludge is 2-3% of the total volume of the sludge. In one embodiment, after the top sewage is discharged, the mixture of partial sludge and water at the joint is returned to the pre-denitrification tank through the return pipe and the return pump, and the residual sludge and the peeled biomembrane are discharged into the sludge tank to be treated by sludge dewatering or outward transportation.
Furthermore, the microorganisms in the BAF tank further degrade COD and BOD, denitrify and remove SS, and the water discharged from the BAF tank is subjected to sand filtration and disinfection treatment and then is discharged after reaching the standard. The microorganisms in the BAF pool are diverse, and anaerobic bacteria, anoxic bacteria and aerobic bacteria are all the same. The sand filtration is used for further removing suspended matters and reducing SS indexes, and the disinfection is used for meeting the index requirements of faecal coliform flora number. BAF, a Biological Aerated filter (Biological Aerated Filters), has the advantages of a biofilm process technology, and also plays an effective space filtration role, and by using a special filter material and a correct gas distribution design, BAF has the following process characteristics: (1) the gas and water flow upwards in parallel, so that the gas and water are well equally divided, the gas blockage phenomenon of the coagulation and the blocking of bubbles in the filter material layer is prevented, the utilization rate of oxygen is high, and the energy consumption is low; (2) in contrast to the downward flow filtration, the upward flow filtration maintains a positive pressure condition over the entire height of the filter, which can better avoid the formation of channeling or short flows, thereby avoiding the formation of air traps that affect the filtration process by forming channeling; (3) upward flow forms a semi-column pushing condition which is beneficial to the process, and the lasting stability and effectiveness of the BAF process can be ensured even if high filtering speed and load are adopted; (4) the air can bring solid substances into the deep part of the filter bed, and high-load and uniform solid substances can be obtained in the filter, so that the backwashing period is prolonged, and the cleaning time and the air water amount used during cleaning are reduced; (5) the cutting action of the filter material layer on the bubbles prolongs the retention time of the bubbles in the filter, and improves the utilization rate of oxygen; (6) and because of the excellent sewage interception capability of the filter, a secondary sedimentation tank is not needed to be arranged behind the BAF. Filtration rate of BAF: 2-8 m/h (10 m/h in denitrification); backwash air speed: 60-90 m/h; solid load capacity: 4-7 kg/BOD organic load: 2-6 kg/. d; chemical oxygen demand organic load: 4-12 kg/. d; system oxygen efficiency: 30-35%; the cost of urban sewage treatment per ton of water is as follows: 800-1000 yuan; nitration (10 ℃): 0.6 to 1.0kg/. d; denitrogenation (10 ℃): 1.5-2.5 kg/. d; the quantity of backwashing water: 5-6 liters per square meter per second; sludge yield: removing kgBOD.d by 0.6-0.7 kg/kg; and ton water and electricity consumption in urban sewage treatment: 0.2 to 0.25 degrees.
The foregoing is directed to embodiments of the present invention, and equivalents, modifications, substitutions and variations such as will occur to those skilled in the art, which fall within the scope and spirit of the appended claims.

Claims (10)

1. A non-membrane treatment method for domestic sewage is characterized by comprising the following steps:
s1, inputting the water body to be treated into the grid and the grit chamber for water body pretreatment;
s2, inputting the pretreated water body into a water collecting tank and a regulating tank, lifting the water body to a pre-denitrification tank by a sewage lifting pump to perform anaerobic ammonia oxidation reaction so as to primarily remove nitrogen;
s3, conveying the water body in the pre-denitrification pool to an anaerobic pool, degrading CODCr and BOD5 in the water body and biologically releasing phosphorus by phosphorus accumulating bacteria;
s4, conveying the water body in the anaerobic tank to an anoxic tank, and performing denitrification and CODCr degradation on the water body;
s5, conveying the water body treated by the anoxic tank to an aerobic tank, wherein the aerobic tank adopts an MBBR process to treat the structures of pollutants in the water;
s6, discharging the effluent of the aerobic tank into a secondary sedimentation tank for solid-liquid separation, returning a part of the sludge separated by the secondary sedimentation tank to a pre-denitrification tank through a return pipe and a return pump, and discharging the residual sludge and the fallen biomembrane into a sludge tank for sludge dewatering or outward transportation treatment;
s7, discharging the effluent of the secondary sedimentation tank into a BAF tank, further degrading COD and BOD in the water body and further denitrifying;
and S8, performing sand filtration and disinfection treatment on the effluent of the BAF pool, and discharging the effluent after reaching the standard.
2. The non-membrane domestic sewage treatment system is characterized in that: the system comprises a water collecting tank, a pre-denitrification tank, an anaerobic tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank and a BAF tank;
the sewage treatment device is characterized in that a sewage lifting pump is arranged in the water collecting tank and used for lifting domestic sewage in the water collecting tank to a pre-denitrification tank, the pre-denitrification tank is used for enabling life to be subjected to anaerobic ammonia oxidation reaction to primarily remove nitrogen, the anaerobic tank is connected with the pre-denitrification tank and used for degrading CODCr and BOD5 in the domestic sewage after the primary nitrogen removal in the pre-denitrification tank and phosphorus-accumulating bacteria biological phosphorus release, the anoxic tank is communicated with the upper end of the anaerobic tank, a water body in the anaerobic tank flows into the anoxic tank after overflowing, the anoxic tank is used for performing denitrification and CODCr degradation on the domestic sewage flowing out of the anaerobic tank, effluent of the anoxic tank enters the aerobic tank, effluent of the aerobic tank enters the secondary sedimentation tank to perform solid-liquid separation, and liquid after the secondary sedimentation tank is discharged after being discharged into the BAF tank.
3. The non-membrane domestic sewage treatment system according to claim 2, wherein: the domestic sewage treatment device further comprises an adjusting tank, the domestic sewage change coefficient Kz introduced into the collecting tank is large, the adjusting tank is arranged between the collecting tank and the pre-denitrification tank, and water in the collecting tank is discharged into the adjusting tank and then is lifted and discharged into the pre-denitrification tank.
4. The non-membrane domestic sewage treatment system according to claim 3, wherein: the air blower further comprises an air blower, the air outlet of the air blower is connected with a plurality of groups of air outlet branch pipes, the air outlet branch pipes are respectively connected with aeration pipes arranged at the bottoms of the regulating tank, the aerobic tank and the BAF tank, and the air blower provides air for the regulating tank, the aerobic tank and the BAF tank through the air outlet branch pipes and the aeration pipes.
5. The non-membrane domestic sewage treatment system according to claim 4, wherein: and the microorganisms in the pre-denitrification tank, the anaerobic tank and the anoxic tank are all in an anaerobic state.
6. The non-membrane domestic sewage treatment system according to claim 5, wherein: the process form of the anaerobic tank can adopt the following steps: UASB, IC, ABR, anaerobic biofilter, anaerobic contact method, anaerobic fluidized bed or anaerobic rotating biological disk.
7. The non-membrane domestic sewage treatment system according to claim 6, wherein: the dissolved oxygen range of the anoxic pond is 0.45mg/L-0.55 mg/L.
8. The non-membrane domestic sewage treatment system according to claim 7, wherein: the aerobic tank adopts an MBBR process form, and mixed liquor in the aerobic tank is pumped out to the anoxic tank through a return pipe and a return pump for retreatment.
9. The non-membrane domestic sewage treatment system according to claim 8, wherein: and one part of the sludge separated in the secondary sedimentation tank flows back to the pre-denitrification tank through a return pipe and a return pump, and the residual sludge and the fallen biological membrane are discharged into the sludge tank for sludge dewatering or outward transportation treatment.
10. The non-membrane domestic sewage treatment system according to claim 9, wherein: the microorganisms in the BAF pool further degrade COD and BOD, denitrify and remove SS, and the water discharged from the BAF pool is discharged after reaching the standard after being subjected to sand filtration and disinfection treatment.
CN202110579786.7A 2021-05-26 2021-05-26 Non-membrane treatment method and system for domestic sewage Pending CN113233709A (en)

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CN104478081A (en) * 2014-12-01 2015-04-01 中国矿业大学 Anaerobic-anoxic/aerobic-parallel reinforced dephosphorization and denitrification technique
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