CN217459126U

CN217459126U - Non-membrane treatment system for domestic sewage

Info

Publication number: CN217459126U
Application number: CN202121149822.8U
Authority: CN
Inventors: 崔秀文; 张严
Original assignee: Xiamen Central Water Technology Co ltd
Current assignee: Xiamen Central Water Technology Co ltd
Priority date: 2021-05-26
Filing date: 2021-05-26
Publication date: 2022-09-20
Anticipated expiration: 2031-05-26

Abstract

The utility model discloses a domestic sewage non-membrane treatment system, which 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 system for domestic sewage

Technical Field

The utility model discloses be applied to the sewage treatment field, specifically be a domestic sewage non-membrane treatment 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.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that the non-membrane treatment system for domestic sewage is provided aiming at the defects of the prior art.

In order to solve the technical problem, the utility model discloses a domestic sewage non-membrane treatment system, which 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 utility model discloses a domestic sewage treatment device, including catch basin, BOD5, oxygen deficiency pond and oxygen deficiency pond, be equipped with the sewage elevator pump in the catch basin, it is used for promoting the domestic sewage in the catch basin to the denitrogenation pond in advance, the denitrogenation pond is used for making the life take place anaerobic ammonia oxidation reaction in order tentatively to remove nitrogen, the anaerobism pond is connected with the denitrogenation pond in advance, and this anaerobism pond is used for degrading CODCr 5 and the biological phosphorus release of phosphorus accumulation bacterium in the domestic sewage after tentatively removing nitrogen in the denitrogenation pond in advance, the oxygen deficiency pond is connected with the anaerobism pond, and this oxygen deficiency pond is used for carrying out denitrification and CODCr degradation to the domestic sewage that flows out in the anaerobism pond, the play water of oxygen deficiency pond gets into the good oxygen pond, good oxygen pond play water gets into two heavy ponds and carries out solid-liquid separation, discharge behind the BAF pond of liquid discharge after two heavy ponds separation, and two heavy pond bottom for leaking hopper-shaped its bottom radius length is one fifth of top radius length.

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 implementation, further, the process form of the anaerobic tank may take: 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.

The utility model adopts the above technical scheme, following beneficial effect has:

the utility model has the advantages of high nitrogen and phosphorus removal efficiency, good treatment effect, low energy consumption, less residual sludge, one-time investment saving, low operating cost, simple and convenient operation and management, small maintenance workload and the like.

Drawings

The present invention will be described in further detail with reference to the following drawings and embodiments:

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention will be combined below to clearly and completely describe the technical solutions in the embodiments of the present invention.

As shown in fig. 1, the utility model provides a domestic sewage non-membrane treatment system, which 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 utility model discloses a domestic sewage treatment device, including catch basin, BOD5, oxygen deficiency pond and oxygen deficiency pond, be equipped with the sewage elevator pump in the catch basin, it is used for promoting the domestic sewage in the catch basin to the denitrogenation pond in advance, the denitrogenation pond is used for making the life take place anaerobic ammonia oxidation reaction in order tentatively to remove nitrogen, the anaerobism pond is connected with the denitrogenation pond in advance, and this anaerobism pond is used for degrading CODCr 5 and the biological phosphorus release of phosphorus accumulation bacterium in the domestic sewage after tentatively removing nitrogen in the denitrogenation pond in advance, the oxygen deficiency pond is connected with the anaerobism pond, and this oxygen deficiency pond is used for carrying out denitrification and CODCr degradation to the domestic sewage that flows out in the anaerobism pond, the play water of oxygen deficiency pond gets into the good oxygen pond, good oxygen pond play water gets into two heavy ponds and carries out solid-liquid separation, discharge behind the BAF pond of liquid discharge after two heavy ponds separation, and two heavy pond bottom for leaking hopper-shaped its bottom radius length is one fifth of top radius length. 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 also 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. (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 manner, further, the system further comprises an air blower, the air outlet of the air blower is connected with a plurality of sets of air outlet branch pipes, the air outlet branch pipes are respectively connected with aeration pipes installed 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 pool can also adopt 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 depending on the aeration in an aeration tank and the lifting action of water flow, further forms activated sludge growing in a suspended mode and a biomembrane growing in an attached mode, enables the biomembrane of a moving bed to use the space of the whole reactor, fully exerts the advantages of both attached phase and suspended phase organisms, makes the advantages of both the attached phase and the suspended phase organisms, and makes the attached phase and the suspended phase organisms play roles of avoiding the disadvantages and supplementing each other.

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. 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 (3) power consumption per ton of urban sewage treatment: 0.2 to 0.25 degrees.

The above embodiments are the embodiments of the present invention, and for those skilled in the art, according to the teaching of the present invention, the equivalent changes, modifications, replacements and variations made by the claims of the present invention should all belong to the scope of the present invention without departing from the principle and spirit of the present invention.

Claims

1. 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;

2. The non-membrane domestic sewage treatment system according to claim 1, wherein: the air-conditioning device further comprises an adjusting tank and an air blower, wherein the adjusting tank is arranged between the water collecting tank and the pre-denitrification tank, water in the water collecting tank is discharged into the adjusting tank and then is lifted and discharged into the pre-denitrification tank, an 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 adjusting tank, the aerobic tank and the BAF tank, and the air blower provides air for the adjusting tank, the aerobic tank and the BAF tank through the air outlet branch pipes and the aeration pipes.

3. The non-membrane domestic sewage treatment system according to claim 2, wherein: and microorganisms in the pre-denitrification tank, the anaerobic tank and the anoxic tank are all in an anaerobic state.

4. The non-membrane domestic sewage treatment system according to claim 3, wherein: the process form of the anaerobic tank is as follows: UASB, IC, ABR, anaerobic biofilter, anaerobic contact method, anaerobic fluidized bed or anaerobic biological rotating disc.

5. The non-membrane domestic sewage treatment system according to claim 4, wherein: the dissolved oxygen range of the anoxic pond is 0.45mg/L-0.55 mg/L.

6. The non-membrane domestic sewage treatment system according to claim 5, 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.

7. The non-membrane domestic sewage treatment system according to claim 6, 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.

8. The non-membrane domestic sewage treatment system according to claim 7, 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.

9. The non-membrane domestic sewage treatment system according to claim 8, wherein: 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.