CN111233153A

CN111233153A - SNAGS-nitrification-synergy aerobic granular sludge sewage treatment device

Info

Publication number: CN111233153A
Application number: CN202010205475.XA
Authority: CN
Inventors: 胡飞; 于海宁; 李飞
Original assignee: Anhui Zhongyuan Jintian Environmental Science And Technology Co Ltd
Current assignee: Anhui Zhongyuan Jintian Environmental Science And Technology Co Ltd
Priority date: 2020-03-23
Filing date: 2020-03-23
Publication date: 2020-06-05

Abstract

The invention belongs to the technical field of sewage treatment, and particularly relates to an SNAGS-synergetic nitrification aerobic granular sludge sewage treatment device, which comprises an anaerobic tank, an anoxic tank, an aerobic tank, a filter tank and an air-lift backflow device which are sequentially arranged along the water inlet direction, wherein one end of the interior of the aerobic tank, which is close to the filter tank, is provided with a sedimentation tank, supernatant liquid precipitated in the sedimentation tank overflows and flows into the filter tank, the supernatant liquid is filtered by the filter tank and then is discharged from a water outlet pipe at the bottom of the filter tank, the air-lift backflow device mainly comprises a first backflow pipe, a second backflow pipe and two air-lift pipes, mixed liquid in the aerobic tank flows back to the front end of the anoxic tank through the first backflow pipe, the defects of the prior art are overcome, the aerobic sewage treatment technology with biochemical reaction and precipitation integrated as a core is adopted, the biochemical tank and the sedimentation tank are efficiently combined, the air-lift technology, the control method is more convenient and is suitable for treating domestic sewage of medium and small cities and towns and river water.

Description

SNAGS-nitrification-synergy aerobic granular sludge sewage treatment device

Technical Field

The invention belongs to the technical field of sewage treatment, and particularly relates to a device for treating sewage by using SNAGS-synergetic nitrification aerobic granular sludge.

Background

With the more mature biochemical treatment technology, the application range of the sewage treatment modes of water inlet, pretreatment, biochemical tank and sedimentation tank in urban sewage treatment is wider and wider. The main objects of sewage treatment are organic matters (COD), ammonia nitrogen, total nitrogen and phosphate. The removal of COD, ammonia nitrogen and total nitrogen is generally accomplished by biological oxidation and nitrification/denitrification.

At present, a common sewage treatment device is influenced by the structure, the number of types of equipment in the device is large, the total engineering investment is large, the occupied area is large, and the popularization and use cost is high.

Disclosure of Invention

The invention aims to provide an SNAGS-synergetic nitrification aerobic granular sludge sewage treatment device, which overcomes the defects of the prior art, adopts an aerobic sewage treatment technology with biochemical reaction and sedimentation integrated as a core, efficiently combines a biochemical tank and a sedimentation tank, reduces the use cost and the occupied area, and is suitable for treating domestic sewage in medium and small towns and river water.

In order to solve the problems, the technical scheme adopted by the invention is as follows:

an SNAGS-synergetic nitrification aerobic granular sludge sewage treatment device comprises an anaerobic tank, an anoxic tank, an aerobic tank, a filter tank and a gas stripping reflux device which are sequentially arranged according to a water inlet direction, wherein a sedimentation tank is arranged at one end, close to the filter tank, in the aerobic tank, supernatant liquid precipitated in the sedimentation tank flows into the filter tank after overflowing, and is discharged from a water outlet pipe at the bottom of the filter tank after being filtered by the filter tank;

the gas stripping reflux device mainly comprises a first reflux pipe, a second reflux pipe and two gas stripping pipes, mixed liquid in the aerobic pool flows back to the front end of the anoxic pool through the first reflux pipe, sludge at the bottom of the anoxic pool flows back to the front end of the anaerobic pool through the second reflux pipe, the bottom ends of the two gas stripping pipes are respectively positioned at the water inlet ends of the first reflux pipe and the second reflux pipe and communicated, and the other end of each gas stripping pipe is connected with a gas supply device.

Further, the sedimentation tank includes the cell body and is located the inside settling zone of cell body, the sedimentation zone is kept away from one side in filtering pond and has been seted up inhalant canal, and the inside sewage sludge mixture top-down of good oxygen pond gets into the settling zone by inhalant canal, the upper portion of settling zone is provided with the pipe chute district, the top in pipe chute district is provided with out the mill weir, and goes out the top intercommunication of mill weir and filtering pond, the below of settling zone is provided with the fender of tilt state, the mud outlet has been seted up to one side that the cell body is close to the lowest of fender, the settling zone is through the bottom intercommunication of mud outlet and good oxygen pond.

Further, the air feeder is a fan, and the inlet ends of the two air stripping pipes are connected to the same fan, and the two air stripping pipes are provided with valves for controlling flow.

Furthermore, the output end of the fan is also connected with two aeration pipes with valves, and the two aeration pipes respectively extend to the bottom of the front end of the aerobic tank and the bottom of the filter tank.

Further, the bottom of the aeration pipe is connected with an aeration hose which is horizontally laid, and the aeration hose is synthesized by reinforced polyvinyl chloride and rubber; the lining is composed of chemical fiber mesh wires, and a plurality of slit-shaped variable aeration holes which are distributed linearly are arranged on the aeration hose.

Further, all be provided with the guide plate in anaerobism pond and the oxygen deficiency pond, the guide plate sets firmly on the lateral wall in anaerobism pond or oxygen deficiency pond, and the bottom of guide plate and the bottom in anaerobism pond or oxygen deficiency pond leave the clearance.

Further, the outside in good oxygen pond is provided with the sludge impoundment, the one end that the oxygen deficiency pond was kept away from at first return tube top is connected with the mud reducing pipe of taking the valve, mud reducing pipe is used for passing through the air stripping device with the surplus mud in good oxygen bottom of the pool portion backward flow back and pumps to the sludge impoundment.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the invention, an aerobic sewage treatment technology with biochemical reaction and precipitation integrated as a core is adopted, the biochemical tank and the sedimentation tank are efficiently combined, water is precipitated through the inclined tube, the settled sludge can realize unilateral self-circulation backflow, the gas stripping technology is adopted to replace a pump structure, the use cost and the occupied area are reduced, and the control method is more convenient;

2. the invention adds a functional area to the sewage at the front section of the traditional oxidation ditch, can realize the alternate states of anoxic and anaerobic through air stripping circulation, can effectively play the effects of nitrogen and phosphorus removal, greatly reduces the sludge load of an aerobic tank and has less residual sludge;

3. the aeration device and the air stripping device are combined and the same fan is adopted to provide the air source, so that the equipment investment of the device is reduced, and the cost of the device is reduced;

4. the invention can be improved on the existing sewage treatment device without changing the pool body of the original device, and has better popularization value.

5. Aerobic granular sludge is used as a biological working medium, so that organic matters and nitrogen can be removed simultaneously, suspended sludge floc is granulated, phosphorus-collecting bacteria are easily separated, the volume of a secondary sedimentation tank reactor for releasing phosphorus is reduced, the sludge bulking problem which often occurs in a high-efficiency biological phosphorus removal system is avoided, the process is simple, the operation and maintenance are easy, the volume of the reactor is reduced, and the requirement of the system on the land area is reduced.

Drawings

FIG. 1 is a schematic diagram of a system configuration of an SNAGS-synergetic nitrification aerobic granular sludge sewage treatment device.

FIG. 2 is a schematic diagram of the internal structure of an SNAGS-synergetic nitrification aerobic granular sludge sewage treatment device.

FIG. 3 is a schematic structural diagram of an inclined tube sedimentation tank in an SNAGS-synergetic nitrification aerobic granular sludge sewage treatment device.

In the figure: 1. an anaerobic tank; 2. an anoxic tank; 3. an aerobic tank; 4. an inclined tube sedimentation tank; 41. a tank body; 42. a settling zone; 43. an oblique tube zone; 44. an effluent weir; 45. a water inlet channel; 46. a fender; 47. a sludge outlet; 5. a filter chamber; 6. a fan; 7. a gas stripping tube; 8. an aeration pipe; 9. a first return pipe; 10. a second return pipe; 11. a sludge reduction tube.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1-2, the apparatus for treating sewage by using SNAGS-synergetic nitrification aerobic granular sludge according to the present invention comprises an anaerobic tank 1, an anoxic tank 2, an aerobic tank 3, a filter tank 5 and a stripping reflux device which are sequentially arranged in a water inlet direction, wherein a sedimentation tank is arranged at one end of the interior of the aerobic tank 3 close to the filter tank 5, supernatant fluid precipitated in the sedimentation tank overflows and then flows into the filter tank 5, and is discharged from a water outlet pipe at the bottom of the filter tank 5 after being filtered by the filter tank 5;

the gas stripping reflux device mainly comprises a first reflux pipe 9, a second reflux pipe 10 and two gas stripping pipes 7, mixed liquor in the aerobic pool 3 is refluxed to the front end of the anoxic pool 2 through the first reflux pipe 9, the reflux ratio is 200-300%, the sludge and sewage are fully mixed by adopting large-proportion reflux, the efficient operation is realized, simultaneously, a carbon source is supplemented, the phenomenon that the internal source is consumed due to insufficient water inlet concentration of strains in the sludge to cause sludge expansion is avoided, and the 'impact' feeding is favorable for forming particles with compact and thick structures; the sludge at the bottom of the anoxic tank 2 returns to the front end of the anaerobic tank 1 through a second return pipe 10, the bottom ends of the two gas stripping pipes 7 are respectively positioned at the water inlet ends of the first return pipe 9 and the second return pipe 10 and communicated, and the other end of the gas stripping pipe 7 is connected with a gas supply device; the mixed liquor comprises nitrifying liquor and sludge in the aerobic tank 3, the nitrifying liquor cannot be directly returned to the anaerobic tank 1 due to high oxygen content in the mixed liquor, the mixed liquor is firstly returned to the anoxic tank 2, and then the sludge is returned to the anaerobic tank 1 from the anoxic tank 2.

The sewage enters an anaerobic tank 1 after being pretreated, so that high COD substances are partially decomposed in the section, then enters an anoxic tank 2 together with nitrifying liquid returned by an aerobic tank 3 for denitrification, then enters an aerobic tank 3 for oxidative degradation of organic matters and nitration reaction, aerobic granular sludge is added into the aerobic tank 3, the aerobic granular sludge has a biological phase relative to flocculent sludge, the microbial community of the aerobic granular sludge is abundant, and the aerobic granular sludge is integrated with a plurality of microorganisms to form a good microenvironment easy for biodegradation, and in addition, the aerobic granular sludge has excellent precipitation performance and higher-concentration sludge interception; the sewage and sludge are fully mixed and then enter a sedimentation tank in the aerobic tank 3, the sedimentation effect of the sedimentation tank realizes solid-liquid separation in the sewage, and the supernatant liquid is discharged into a filter tank 5 and is discharged after reaching the standard after further clarification; and (3) transferring part of sludge to the anaerobic tank 1 as carbon source supplement through the matching two-time gas stripping of the first return pipe 9 and the second return pipe 10.

The sedimentation tank includes cell body 41 and is located the inside settling zone 42 of cell body 41, intake channel 45 has been seted up to one side that the filtering pond 5 was kept away from to settling zone 42, the inside sewage sludge mixed liquid top-down of aerobic tank 3 gets into settling zone 42 by intake channel 45, the upper portion of settling zone 42 is provided with pipe chute area 43, the top of pipe chute area 43 is provided with out water weir 44, and go out water weir 44 and filtering pond 5's top intercommunication, the below of settling zone 42 is provided with the fender 46 of tilt state, cell body 41 is close to the one side of fender 46 lowest department and has seted up mud outlet 47, settling zone 42 is through the bottom intercommunication of mud outlet 47 with aerobic tank 3, the fixed hang plate in top of mud outlet 47, reduce the mud resistance of arranging, utilize mud dead weight to arrange mud, unilateral self-circulating reflux, denitrification mode of operation has been realized.

The sewage and sludge fully mixed in the aerobic tank 3 enters a sedimentation area 42 in the tank body 41 from a water inlet channel 45 at one side of the tank body 41, flows upwards through an inclined pipe area 43 to achieve the purpose of separating mud and water, the sludge slides onto an inclined mudguard 46 at the bottom of the tank body 41 along the inclined pipe area 43 and is discharged through a sludge outlet 47 at the bottom of the tank body 41, the discharged water flows upwards to a water outlet area at the upper side of the inclined pipe area 43, the water is discharged through a water outlet weir 44, and the water is discharged through a water outlet pipe and flows into the filter tank 5; a co-construction type rectangular settling zone 42 is added at the tail end of an oxidation ditch in the oxidation pond, water is settled through an inclined pipe, single-side self-circulation backflow of settled sludge can be realized, and an unpowered denitrification operation mode is realized.

The air supply device is a fan 6, the air inlet ends of two air stripping pipes 7 are connected to the same fan 6, and valves for controlling flow are arranged on the two air stripping pipes 7; the output end of the fan 6 is also connected with two aeration pipes 8 with valves, and the two aeration pipes 8 respectively extend to the bottom of the front end of the aerobic tank 3 and the bottom of the filter 5; starting a fan 6 to introduce sufficient oxygen into the aerobic tank 3 and the filter tank 5 through air delivery pipes respectively, and enabling the sewage in the aerobic tank and the filter tank to be in a flowing state so as to ensure that the sewage is fully contacted with the filler immersed in the sewage and avoid the defect of uneven contact between the sewage and the filler in a biological contact oxidation tank; the air current that fan 6 produced gets into the bottom of good oxygen pond 3 and oxygen deficiency pond 2 respectively through gas lift pipe 7, and under the drive of air rising power, the mixed liquor upflow can realize oxygen deficiency, anaerobism alternation state, can effectively play nitrogen and phosphorus removal effect, has reduced the mud load of good oxygen pond 3 by a wide margin, and the surplus mud is less.

For convenient and accurate control, the valves on the first return pipe 9, the second return pipe 10, the two gas stripping pipes 7, the two aeration pipes 8 and the sludge reduction pipe 11 are all electromagnetic flow control valves, and the operation is more convenient and faster by adjusting the electromagnetic flow control valves to accurately control the return and aeration.

In order to improve the aeration efficiency, the bottom of the aeration pipe 8 is connected with an aeration hose which is horizontally laid and is synthesized by reinforced polyvinyl chloride and rubber; the liner is composed of chemical fiber mesh wires, and a plurality of slit-shaped variable aeration holes which are distributed linearly are arranged on the aeration hose; the aeration hose is fixedly installed by adopting a circular fixing ring, the installation distance is 8-14cm, carpet type aeration can be realized, high-efficiency mass transfer is completed, and energy consumption is saved; the oxygen content in water is measured by installing a soluble oxygen meter in an aeration area, automatic control is realized through a PLC (programmable logic controller), and meanwhile, the dissolved oxygen of an aerobic pool is controlled to be about 2mg/L, the dissolved oxygen of an anoxic pool is controlled to be about 0.5, and the dissolved oxygen of an anaerobic pool is less than 0.2 mg/L.

Flow guide plates are arranged in the anaerobic tank 1 and the anoxic tank 2, the flow guide plates are fixedly arranged on the side walls of the anaerobic tank 1 or the anoxic tank 2, and gaps are reserved between the bottom ends of the flow guide plates and the bottoms of the anaerobic tank 1 or the anoxic tank 2; the sewage enters the anaerobic tank 1 or the anoxic tank 2 from the upper part, and the guide plate is provided with a channel at the bottom part thereof so as to keep the sewage in a flowing state.

In order to reduce the sludge content in the system, a sludge reducing pump and a sludge tank are further arranged on the outer side of the aerobic tank 3, the sludge reducing pump is used for pumping the residual sludge after the bottom of the aerobic tank 3 returns to the sludge tank, and the residual sludge is transported outside after being treated in the sludge tank.

The SNAGS-synergetic nitrification aerobic granular sludge sewage treatment device is applied to treatment of domestic sewage in a certain district of Anhui province, the COD concentration of inlet water is 300mg/L, NH3-N is 50mg/L, and TP is 4.5 mg/L; the COD concentration of the effluent is less than 40mg/L, NH3-N is as low as 2mg/L, and TP is less than 0.3 mg/L; COD, NH3-N, TP treatment efficiency reaches 86.6%, 96% and 93.3%, and reaches the standard of surface V-type water.

The fan 6 and the electromagnetic flow control valve used in the present invention are conventional devices in the art, and their structure and type are well known to those skilled in the art.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. An SNAGS-synergetic nitrification aerobic granular sludge sewage treatment device is characterized in that: the device comprises an anaerobic tank (1), an anoxic tank (2), an aerobic tank (3), a filter tank (5) and a gas stripping reflux device which are sequentially arranged according to the water inlet direction, wherein a sedimentation tank is arranged at one end, close to the filter tank (5), in the aerobic tank (3), supernatant liquid precipitated in the sedimentation tank flows into the filter tank (5) after overflowing, and is discharged from a water outlet pipe at the bottom of the filter tank (5) after being filtered by the filter tank (5);

the gas stripping reflux device mainly comprises a first reflux pipe (9), a second reflux pipe (10) and two gas stripping pipes (7), mixed liquid in the aerobic pool (3) flows back to the front end of the anoxic pool (2) through the first reflux pipe (9), sludge at the bottom of the anoxic pool (2) flows back to the front end of the anaerobic pool (1) through the second reflux pipe (10), the bottom ends of the gas stripping pipes (7) are respectively positioned at the water inlet ends of the first reflux pipe (9) and the second reflux pipe (10) and communicated with each other, and the other end of the gas stripping pipe (7) is connected with a gas supply device.

2. The apparatus of SNAGS-synergetic nitrification aerobic granular sludge treatment of sewage according to the claim, wherein: sedimentation tank includes cell body (41) and is located inside sedimentation zone (42) of cell body (41), inhalant canal (45) have been seted up to sedimentation zone (42) one side of keeping away from filtering pond (5), and the inside sewage sludge mixed liquid top-down of aerobic pond (3) gets into sedimentation zone (42) by inhalant canal (45), the upper portion of sedimentation zone (42) is provided with inclined tube district (43), the top in inclined tube district (43) is provided with out weir (44), and goes out weir (44) and the top intercommunication of filtering pond (5), the below of sedimentation zone (42) is provided with fender (46) of tilt state, mud outlet (47) have been seted up to one side that cell body (41) are close to fender (46) lowest department, sedimentation zone (42) are through the bottom intercommunication of mud outlet (47) with aerobic pond (3).

3. The apparatus of SNAGS-synergetic nitrification aerobic granular sludge treatment of sewage according to the claim, wherein: the air supply device is a fan (6), the air inlet ends of the two air stripping pipes (7) are connected to the same fan (6), and the air inlet ends of the two air stripping pipes (7) are provided with valves for controlling flow.

4. The apparatus of SNAGS-synergetic nitrification aerobic granular sludge treatment of sewage according to the claim, wherein: the output end of the fan (6) is also connected with two aeration pipes (8) with valves, and the two aeration pipes (8) respectively extend to the bottom of the front end of the aerobic tank (3) and the bottom of the filter tank (5).

5. The apparatus of SNAGS-synergetic nitrification aerobic granular sludge treatment of sewage according to the claim, wherein: the bottom of the aeration pipe (8) is connected with an aeration hose which is horizontally laid and is synthesized by reinforced polyvinyl chloride and rubber; the lining is composed of chemical fiber mesh wires, and a plurality of slit-shaped variable aeration holes which are distributed linearly are arranged on the aeration hose.

6. The apparatus of SNAGS-synergetic nitrification aerobic granular sludge treatment of sewage according to the claim, wherein: all be provided with the guide plate in anaerobism pond (1) and oxygen deficiency pond (2), the guide plate sets firmly on the lateral wall in anaerobism pond (1) or oxygen deficiency pond (2), and the bottom of guide plate leaves the clearance with the bottom in anaerobism pond (1) or oxygen deficiency pond (2).

7. The apparatus of SNAGS-synergetic nitrification aerobic granular sludge treatment of sewage according to the claim, wherein: the outside in good oxygen pond (3) is provided with the sludge impoundment, the one end that oxygen deficiency pond (2) were kept away from at first return tube (9) top is connected with sludge reduction pipe (11) of taking the valve, sludge reduction pipe (11) are used for passing through the air stripping device with the surplus mud in good oxygen pond (3) bottom backward flow back and suction to the sludge impoundment.