CN212246410U

CN212246410U - IFAS-AOAS integrated sewage treatment device

Info

Publication number: CN212246410U
Application number: CN202020328783.7U
Authority: CN
Inventors: 张进; 梁仁君
Original assignee: Sichuan Science City Tianren Environmental Protection Co ltd
Current assignee: Sichuan Science City Tianren Environmental Protection Co ltd
Priority date: 2020-03-16
Filing date: 2020-03-16
Publication date: 2020-12-29
Anticipated expiration: 2030-03-16

Abstract

The utility model discloses an IFAS-AOAS integration sewage treatment plant. The device comprises a body treatment facility, an aeration system and an automatic control system, wherein the body treatment facility comprises an anoxic zone, a primary IFAS zone, a secondary AOAS zone, a flocculation reaction zone and an inclined tube settling zone; the aeration system comprises a blower, a perforated aeration device and an aeration disc. The device is adopted to carry out sewage treatment, the anoxic zone and the primary IFAS zone are filled with corresponding suspended fillers, and the secondary AOAS zone is provided with suspended fillers, so that not only can intermittent aeration be carried out, but also can aeration be carried out all the time; the AOAS area is also integrated with a sedimentation area, and one pump is adopted to reflux the mixed liquid and the sludge; the equipment is highly integrated, and the occupied area and the investment are reduced; the primary IFAS area can adjust the adding proportion of the filler according to the water quality condition, so that the equipment is standardized; the secondary AOAS area process section can adjust the aeration state according to the water inlet condition, thereby changing the removal effect of the equipment on each water quality; the device better solves the problem of large change of the quality of sewage in villages and towns, and has stronger adaptability.

Description

IFAS-AOAS integrated sewage treatment device

Technical Field

The utility model belongs to the technical field of the environmental protection, especially, belong to sewage treatment technical field, concretely relates to IFAS-AOAS integration sewage treatment plant.

Background

The quantity of villages and towns in China is very large, the quantity of constructed towns is increased year by year, in 2016, the quantity of villages in China is 261.7 ten thousand, the quantity of constructed towns is 1.81 ten thousand, and the quantity of constructed towns supplies water up to 135.3 billion cubic meters. In the face of such huge water volume, the number of plants to be built in villages and built towns in China is also increased urgently, but due to the unbalanced urban and rural development in China, the built towns with domestic sewage treatment facilities in China account for 28% and the villages with domestic sewage treatment facilities account for 20% in 2016.

At present, the method is used for treating sewage in villages and towns (10 m per day)³-2000m³Water discharge) distributed treatment, two major technologies and processes are mainly adopted at home and abroad. One is to use the successful experience of the secondary biochemical treatment of the urban sewage treatment plant for reference, miniaturize the secondary biochemical treatment process of some traditional urban sewage treatment plants and apply the process to the distributed sewage treatment of villages and towns. Such as SBR, oxidation ditch, A/O, or even A²/O, MBR, and so on. From the technical point of view only, the technologies and the processes are mature, and can meet the requirements of sewage treatment. However, these techniques and processes are generally complex and require a relatively large amount of equipment. Therefore, the investment is relatively large, the system maintenance and management are complex, the energy consumption and the operation management cost are high, and some secondary pollution problems can be caused. Such a processing system is not suitable for the practical situation of social economy of villages and towns in China. As a result, a large amount of investment is required to construct a sewage treatment plant (station), which is in an abnormal operation state or a stopped operation state due to high operation cost, lack of normal maintenance management (no corresponding technical force), and the like, and thus, the sewage treatment plant does not play a role in treating sewage and protecting the water environment at all.

The second category is to adopt some relatively simple ecological sewage treatment technologies, including constructed wetlands, lagoons, land treatment systems, etc. The technology has the advantages of simple process, low investment, low energy consumption, simple and convenient maintenance, environmental protection and the like, and has the defects of low treatment efficiency, and generally, a stable treatment effect can be obtained and the long-term normal operation of the system can be maintained under certain conditions, such as low hydraulic load, organic load and long HRT, so that a large available field is required.

Disclosure of Invention

In order to overcome the defects of the existing sewage treatment technology of villages and towns, the utility model provides an IFAS-AOAS integrated sewage treatment device, which can meet the requirement of great change of the quality and the quantity of sewage water of villages and towns, can reduce the occupied area and the investment, and has convenient operation and management.

The utility model discloses a following technical scheme realizes:

the IFAS-AOAS integrated sewage treatment device comprises a body treatment facility, an aeration system and an automatic control system, and is characterized in that: the body treatment facility comprises an anoxic zone, a primary IFAS zone, a secondary AOAS zone, a flocculation reaction zone and an inclined tube sedimentation zone which are connected in sequence through water; the aeration system is arranged in the first-stage IFAS area and the second-stage AOAS area and comprises a blower, a perforating aeration device and an aeration disc; the automatic control system is in control connection with the secondary AOAS area aeration main pipe valve, the water inlet pump and the reflux pump.

The anoxic zone is internally provided with a stirrer and a water inlet tank and is filled with suspended fillers accounting for 35-50% of the total volume of the anoxic zone, and the anoxic zone intercepts the fillers in the anoxic zone through a filler intercepting device and is communicated with the primary IFAS zone through water.

The primary IFAS area is provided with a water distributor communicated with the filler intercepting device of the anoxic area, the bottom of the primary IFAS area is provided with a perforating aeration device filled with suspended fillers accounting for 35-50% of the total volume of the primary IFAS area, and the primary IFAS area intercepts the fillers in the area through the filler intercepting device and is communicated with the secondary AOAS area.

The second-level AOAS area is divided into a reaction area and a reflux settling area by a partition board, the reaction area is communicated with the bottom of the settling area, an aeration disc of an aeration system is arranged at the bottom of the reaction area, a suspended filler is arranged in the middle of the reaction area, a reflux pump is arranged outside the settling area, and the reflux pump is used for refluxing mixed liquid and sludge.

The flocculation reaction area is divided into two grids which are communicated at the bottom; the first grid is provided with a flocculation stirrer for adding a phosphorus removing agent and mixing the phosphorus removing agent with sewage by stirring, the second grid reaction zone is provided with a plurality of stages of compartments, and each compartment is separated by a porous partition plate and is formed by water through combination.

The bottom of the inclined tube settling zone is provided with an inclined tube, the center of the upper part of the inclined tube settling zone is provided with a central cylinder, and the edge of the upper part of the inclined tube settling zone is provided with a clear water outlet groove; the height of the inclined tube is 0.6-1.5 m, and the inclined angle of the inclined tube is 60 degrees.

The sewage treatment process adopting the sewage treatment device comprises the following steps: an anoxic process, an aerobic process, a Synchronous Nitrification and Denitrification (SND) process and a flocculation precipitation process;

an oxygen-deficient process: after the sewage, the backflow mixed liquid and the sludge are converged in the water inlet tank, the sewage enters the bottom of the anoxic zone through the flow guide pipe, and the sewage enters the first-level IFAS zone from bottom to top through the filler intercepting device. The sewage is fully contacted with the microorganisms attached to the filler under the stirring action of the stirrer, the denitrifying bacteria on the surface layer use carbon-containing organic matters in the sewage as carbon sources to reduce nitrate radicals flowing back through internal circulation in the aerobic tank into N₂And release, phosphorus microorganisms (phosphorus-accumulating bacteria and the like) in the inner layer release phosphorus, so that the requirement of bacteria on phosphorus is met;

an aerobic process: the sewage passing through the anoxic tank enters a first-stage IFAS area from a water distributor, 35 to 50 percent of suspended biological filler is added in the area, and the filler is fully mixed with the sewage through the aeration of a perforation aeration system to keep DO at about 4 mg/L. Part of the microorganisms are fixed on the surface of the filler in the form of a biological film, and part of the microorganisms are suspended in water in a flocculent manner, so that organic matters are biochemically degraded by the microorganisms and continuously descend; the organic nitrogen is ammoniated and then nitrated to make NH₃The N concentration drops significantly, but NO is produced as a result of the nitration process₃The concentration of N increases, and P also decreases at a faster rate with excessive uptake by the polyphosphate accumulating bacteria.

Synchronous Nitrification and Denitrification (SND) process: after sewage enters a secondary AOAS area through a filler intercepting device of a primary IFAS area, the DO of the area is controlled to be 1-3 mg/L, so that NH is further reduced₃-N、NO₂-N and NO₃-N. The zone is provided with a backflow sedimentation zone separated by a partition plate, and sludge and mixed liquor which are sedimentated are reflowed to a water inlet tank of an anoxic zone by a pump, so that certain sludge concentration is maintained, and non-degraded NO is recycled₂-N and NO₃And (4) refluxing N to the anoxic zone for denitrification. The ingenious arrangement of the area enablesThe reflux flow is reduced, the aeration quantity is reduced, and the reaction efficiency is increased, thereby saving the tank capacity and the energy consumption. In addition, after the substances needing to be removed are strengthened through the analysis of the quality of the inlet water, the aeration quantity can be flexibly adjusted, so that the quality of the outlet water is ensured to be stable and reach the standard.

The flocculating settling process includes biochemical reaction of sewage, initial sludge-water separation in the reflux settling area, and adding phosphate eliminating agent to agglomerate the phosphate in sewage into granular and non-soluble matter. Then, the sewage enters an inclined tube settling zone for settling and overflows into an effluent tank from an upper effluent weir to be discharged after reaching the standard, and phosphorus in the sewage exists in floc sludge in the form of a phosphate complex and is accumulated at the bottom of the tank to be discharged.

When the concentration COD of the inlet water is more than 400mg/L, NH₃When N is more than 40mg/L, the packing proportion of the anoxic zone and the primary IFAS zone is 50 percent of the total volume, and the secondary AOAS zone is always aerated to increase the reflux ratio; when the concentration COD of the inlet water is less than or equal to 350mg/L, NH₃And when the-N is less than or equal to 35mg/L, the filler proportion of the anoxic zone and the primary IFAS zone is 35-45% of the total volume, and the secondary AOAS zone can perform intermittent aeration to reduce the reflux ratio.

The utility model discloses profitability: the device and the implementation process of the utility model can adopt different filler adding ratios, different aeration modes and different proportions of reflux ratios to ensure that the treated sewage with different water quality reaches the first-level A standard in the national discharge standard GB18918-2002 of pollutants for municipal sewage treatment plants aiming at the characteristic of large change of the quality and the quantity of the sewage water in villages and towns; the utility model discloses well anoxic zone and one-level IFAS district fill have the suspension to pack, according to the quality of water concentration of intaking, throw the filler of throwing different proportions, can guarantee that the sewage of different concentrations can be handled to the same processing apparatus. The secondary AOAS area can not only perform intermittent aeration, alternate aerobic environment and anoxic environment to strengthen nitrification and denitrification, but also perform continuous aeration to strengthen carbonization and nitrification. The AOAS area is also integrated with a sedimentation area which is separated by a partition plate, a sedimentation tank is not required to be additionally built, and a pump is adopted to reflux the mixed liquid and the sludge; the equipment is highly integrated, and the occupied area and the investment are reduced. The proportion of adding the filler can be adjusted according to the water quality condition in the first-level IFAS area, so that the equipment is standardized, and the biomembrane can be more suitable for the fluctuation of the water quality and the water quantity. The secondary AOAS area process section can adjust the aeration state according to the water inlet condition, thereby changing the removal effect of the equipment on each water quality. Therefore, the process better solves the problem of large change of the quality of the sewage in the villages and towns, and has stronger adaptability. The device is modularized, standardized, integrated and automatic, so that the construction is rapid, the operation management is simple, and the operation cost is low.

Drawings

FIG. 1 is a schematic plan view of the device of the present invention;

fig. 2 is a schematic view of the vertical structure of the device of the present invention;

FIG. 3 is a schematic diagram of the structure of the flocculation reaction zone of the present invention.

In the figure, 1 is an anoxic zone, 2 is a primary IFAS zone, 3 is a secondary AOAS zone, 4 is a flocculation reaction zone, 5 is an inclined tube sedimentation zone, 6 is an air blower, 7 is a mixed liquid and sludge reflux pump, 8 is a water inlet tank, 9 is an anoxic stirrer, 10 is a filler interception device, 11 is an anoxic filler, 12 is an aerobic filler, 13 is a water distributor, 14 is a perforated aeration device, 15 is an aeration disc, 16 is a suspended filler, 17 is a reflux sedimentation zone, 18 is a flocculation stirrer, 19 is an electric butterfly valve, 20 is a flocculation reactor, 21 is an inclined tube, 22 is a water outlet tank, and 23 is a central cylinder.

Detailed Description

The present invention will be further described with reference to the following embodiments, which are intended to illustrate the principles of the present invention without limiting the present invention in any way, and the present invention is not beyond the scope of the present invention.

With reference to the attached drawings.

The device comprises a body treatment facility, an aeration system and an automatic control system, wherein the body treatment facility comprises an anoxic zone 1, a primary IFAS zone 2, a secondary AOAS zone 3, a flocculation reaction zone 4 and an inclined tube settling zone 5 which are sequentially communicated by water flow; the aeration system comprises a blower 6, a perforated aeration device 14 and an aeration disc 15; the automatic control system is in control connection with the secondary AOAS area aeration main pipe valve 19, the water inlet pump, the mixed liquid and sludge reflux pump 7.

The anoxic zone 1 is provided with a water inlet tank 8 and a stirrer 9, 35-50% of suspended filler 11 is filled in the anoxic zone, and the filler in the anoxic zone is intercepted by a filler intercepting device 10.

The primary IFAS zone 2 is provided with a water distributor 13, a filler intercepting device 10, a perforation aeration device 14 and aerobic suspended fillers 12 of which the content is 35 to 50 percent.

The second-level AOAS area 3 is divided into a reaction area and a reflux settling area 17 by a partition board, the reaction area is communicated with the bottom of the settling area, an aeration disc 15 of an aeration system is arranged at the bottom of the reaction area, a suspension filler 16 is arranged in the middle of the reaction area, a mixed liquid and sludge reflux pump 7 is arranged outside the settling area 17, and the mixed liquid and the sludge are refluxed.

The flocculation reaction zone 4 is divided into 2 grids, a phosphorus removing agent is added into the first grid, the agent is mixed with the sewage by the stirring of the stirrer 18, and the second grid is a reaction zone.

The sewage enters a central cylinder 23 of the inclined tube settling zone 5 through a pipeline, the height of an inclined tube 21 in the inclined tube settling zone 5 is 0.6-1.5 m, the inclined angle of the inclined tube is 60 degrees, and a water outlet groove 22 is formed in the upper part of the inclined tube settling zone.

The above regions are communicated through pipelines.

The sewage treatment process adopting the sewage treatment device comprises the following steps:

the method comprises the following steps: an anoxic process, an aerobic process, a Synchronous Nitrification and Denitrification (SND) process and a flocculation precipitation process;

an oxygen-deficient process: sewage and the mixed liquid and sludge returned by the mixed liquid and sludge return pump 7 are converged in the water inlet tank 8 and then enter the bottom of the anoxic zone through the flow guide pipe, and the sewage enters the first-level IFAS zone 2 from bottom to top through the filler intercepting device 10. The sewage is fully contacted with the microorganisms attached to the filler under the stirring action of the stirrer 9, the denitrifying bacteria on the surface layer use carbon-containing organic matters in the sewage as carbon sources to reduce nitrate radicals flowing back through internal circulation in the aerobic tank into N₂And release, phosphorus microorganisms (phosphorus-accumulating bacteria and the like) in the inner layer release phosphorus, so that the requirement of bacteria on phosphorus is met;

an aerobic process: the sewage passing through the anoxic tank enters a first-stage IFAS area from a water distributor 132, 35 to 50 percent of aerobic suspended biological filler 12 is added in the area, and the filler is fully mixed with the sewage by the aeration of the perforating aeration system 14, so that DO is kept at about 4 mg/L. Part of the microorganisms are fixed on the surface of the filler in the form of a biological film, and part of the microorganisms are suspended in water in a flocculent manner, so that organic matters are biochemically degraded by the microorganisms and continuously descend; the organic nitrogen is ammoniated and then nitrated to make NH₃The N concentration drops significantly, but NO is produced as a result of the nitration process₃The concentration of N increases, and P also decreases at a faster rate with excessive uptake by the polyphosphate accumulating bacteria.

Synchronous Nitrification and Denitrification (SND) process: after sewage enters a secondary AOAS area 3 through a filler intercepting device 10 of a primary IFAS area 2, the DO of the area is controlled to be 1-3 mg/L, so that NH is further reduced₃-N、NO₂-N and NO₃-N. The zone is provided with a backflow sedimentation zone 17 separated by a partition board, and the settled sludge and mixed liquor flow back to a water inlet tank 8 of the anoxic zone by a pump 7, so that certain sludge concentration is maintained, and the undegraded NO is also returned₂-N and NO₃And (4) refluxing N to the anoxic zone for denitrification. The ingenious setting in this region makes the backward flow reduce, and the aeration rate reduces, and reaction efficiency increases to save the pond volume, save the energy consumption. In addition, after the substances needing to be removed are strengthened through the analysis of the quality of the inlet water, the aeration quantity can be flexibly adjusted, so that the quality of the outlet water is ensured to be stable and reach the standard.

The flocculation precipitation process comprises the steps of carrying out biochemical reaction on the sewage, carrying out primary mud-water separation in a backflow precipitation area, then feeding the sewage into a flocculation precipitation area 4, and adding a phosphorus removal agent to enable a medicament to react with phosphate in the sewage and condense the phosphate into granular and non-soluble substances. Then, the sewage enters the inclined tube settling zone 5 for settling and overflows into the effluent tank 22 from the upper effluent weir to be discharged after reaching the standard, and phosphorus in the sewage exists in floc sludge in the form of phosphate complex and is accumulated at the bottom of the tank to be discharged.

When the concentration COD of the inlet water is more than 400mg/L, NH₃When N is more than 40mg/L, the packing proportion of the anoxic zone and the primary IFAS zone is 50 percent of the total volume, and the secondary AOAS zone is always aerated to increase the reflux ratio; when the concentration COD of the inlet water is less than or equal to 350mg/L, NH₃N is less than or equal to 35mg/LThe proportion of the fillers in the anoxic zone and the primary IFAS zone is 35-45% of the total volume, and the secondary AOAS zone can perform intermittent aeration to reduce the reflux ratio.

Claims

1. The IFAS-AOAS integrated sewage treatment device comprises a body treatment facility, an aeration system and an automatic control system, and is characterized in that: the body treatment facility comprises an anoxic zone, a primary IFAS zone, a secondary AOAS zone, a flocculation reaction zone and an inclined tube sedimentation zone which are connected in sequence through water; the aeration system is arranged in the first-stage IFAS area and the second-stage AOAS area and comprises a blower, a perforating aeration device and an aeration disc; the automatic control system is in control connection with the secondary AOAS area aeration main pipe valve, the water inlet pump and the reflux pump.

2. The IFAS-AOAS integrated wastewater treatment plant of claim 1, wherein: the anoxic zone is internally provided with a stirrer and a water inlet tank and is filled with suspended filler accounting for 35-50% of the total volume of the anoxic zone, and the anoxic zone intercepts the filler in the anoxic zone area through a filler intercepting device and is communicated with the primary IFAS zone.

3. The IFAS-AOAS integrated wastewater treatment plant of claim 1, wherein: the primary IFAS area is provided with a water distributor communicated with the anoxic area filler intercepting device, the bottom of the primary IFAS area is provided with a perforating aeration device filled with suspended fillers accounting for 35-50% of the total volume of the primary IFAS area, and the primary IFAS area intercepts the fillers in the primary IFAS area through the filler intercepting device and is communicated with the secondary AOAS area.

4. The IFAS-AOAS integrated wastewater treatment plant of claim 1, wherein: the second-level AOAS area is divided into a reaction area and a reflux settling area by a partition board, the reaction area is communicated with the bottom of the settling area, an aeration disc of an aeration system is arranged at the bottom of the reaction area, a suspended filler is arranged in the middle of the reaction area, a reflux pump is arranged outside the settling area, and the reflux pump is used for refluxing mixed liquid and sludge.

5. The IFAS-AOAS integrated wastewater treatment plant of claim 1, wherein: the flocculation reaction area is divided into two grids which are communicated at the bottom; the first grid is provided with a flocculation stirrer for adding a phosphorus removing agent and mixing the phosphorus removing agent with sewage by stirring, the second grid reaction zone is provided with a plurality of stages of compartments, and each compartment is separated by a porous partition plate and is formed by water through combination.

6. The IFAS-AOAS integrated wastewater treatment plant of claim 1, wherein: the bottom of the inclined tube settling zone is provided with an inclined tube, the center of the upper part of the inclined tube settling zone is provided with a central cylinder, and the edge of the upper part of the inclined tube settling zone is provided with a clear water outlet groove; the height of the inclined tube is 0.6-1.5 m, and the inclined angle of the inclined tube is 60 degrees.