CN111977782A

CN111977782A - Immersed HEBR bioreactor, sewage treatment system and method

Info

Publication number: CN111977782A
Application number: CN202010737416.7A
Authority: CN
Inventors: 林明; 王磊; 左晶; 张恒; 谢耀东; 黄鑫; 庄毅璇; 曹大伟
Original assignee: Pku Hkust Shenzhen Hongkong Environmental Protection Engineering Co ltd
Current assignee: Shenzhen Shenzhen Hong Kong industry university research Environmental Protection Engineering Technology Co., Ltd;; Shenzhen sower Ecological Technology Co.,Ltd.
Priority date: 2020-07-28
Filing date: 2020-07-28
Publication date: 2020-11-24

Abstract

The invention discloses an immersed HEBR bioreactor, a sewage treatment system and a method thereof. The immersed HEBR bioreactor comprises an aerobic tank, an aeration mechanism and a three-phase separation reaction mechanism, wherein the aeration mechanism is arranged at the bottom of the aerobic tank, a liquid inlet is formed in the bottom of the aerobic tank, the three-phase separation reaction mechanism comprises a partition support piece, a partition plate, a guide plate and a flow baffle plate, the partition support piece is arranged in the aerobic tank, the partition plate is positioned above the partition support piece, two axial ends of the partition plate are connected to a first inner wall and a second inner wall which are opposite to the aerobic tank, two sides of the partition plate are bent towards the partition support piece, two axial sides of the partition support piece are respectively connected with the guide plate, two sides of the partition plate are respectively connected with the flow baffle plate, the flow baffle plate extends to protrude out of the partition support piece towards the bottom biochemical region, and a flow guide channel for communicating the. The bioreactor has high treatment efficiency.

Description

Immersed HEBR bioreactor, sewage treatment system and method

Technical Field

The invention relates to the technical field of sewage treatment, in particular to an immersed HEBR bioreactor, a sewage treatment system and a sewage treatment method thereof.

Background

At present, three-phase separation devices with various structures are arranged at home and abroad, most of the three-phase separation devices are designed according to a solid-liquid and gas-liquid two-phase separation method, and the problem of sludge loss can occur when the impact load is high, so that the number of the three-phase separation devices which can be produced and applied in a large scale is small.

Engineering practice researches show that the existing three-phase separation device mainly has the following reasons: (1) the separation unit has a simple structure, steam-water separation cannot be completely realized due to design reasons, and rising bubbles enter the solid-liquid separation zone to influence the sludge precipitation backflow effect; (2) the water inlet seam of the solid-liquid separation zone is superposed with the sludge return seam, which causes interference to the sludge return to the biochemical zone. (3) The sludge stays for a long time in the solid-liquid separation zone, so that the anaerobic production period of the sediment is caused, and the sludge-water separation effect is influenced.

Disclosure of Invention

Based on the above, there is a need to provide an immersed HEBR bioreactor which has high treatment efficiency, impact load resistance, simple structure, convenient installation and maintenance and reduced investment cost and operation cost, and a sewage treatment system and a sewage treatment method thereof which have simple process flow, high treatment efficiency and small occupied area, wherein the effluent of sewage treated by the sewage treatment method can be superior to the primary a standard of pollutant discharge standard of urban sewage treatment plant (GB 18918-2002).

An immersed HEBR bioreactor, which is characterized by comprising an aerobic tank, an aeration mechanism and a three-phase separation reaction mechanism, wherein the aeration mechanism is arranged at the bottom of the aerobic tank, the bottom of the aerobic tank is provided with a liquid inlet, the three-phase separation reaction mechanism comprises a partition support piece, a baffle plate and a baffle plate, the partition support piece is arranged in the aerobic tank, two ends in the axial direction of the partition support piece are respectively connected with a first inner wall and a second inner wall which are opposite to the aerobic tank, a bottom biochemical zone is formed in the lower area of the partition support piece, the baffle plate is positioned above the partition support piece, two ends in the axial direction of the baffle plate are respectively connected with the first inner wall and the second inner wall, two sides of the baffle plate are respectively bent downwards, two sides in the axial direction of the partition support piece are respectively connected with the baffle plate, and the upper and lower sides of the baffle plate are, the gas collection area is formed between the blocking plate and the partition supporting piece and close to the area of the blocking plate, the area between the guide plates connected with the two sides of the partition supporting piece forms a transition biochemical area, the two sides of the blocking plate are respectively connected with the flow baffle plates, the flow baffle plates extend to protrude out of the partition supporting piece towards the bottom biochemical area, a flow guide channel used for communicating the bottom biochemical area with the transition biochemical area is formed between the flow baffle plates and the blocking plate, and a solid-liquid separation area is formed between the flow baffle plates and the inner wall of the aerobic tank and between the adjacent flow baffle plates.

In one of them embodiment, three-phase separation reaction mechanism still includes long limit air guide plate and minor face air guide plate, subregion support piece both sides the bottom of guide plate is connected with respectively long limit air guide plate or minor face air guide plate, long limit air guide plate with minor face air guide plate all moves towards the biochemical district of bottom extends, subregion support piece both sides on the guide plate long limit air guide plate or minor face air guide plate keeps away from each other, be connected with on the inner wall in good oxygen pond with long limit air guide plate complex minor face air guide plate, or with minor face air guide plate complex long limit air guide plate, the terminal directional correspondence of minor face air guide plate long limit air guide plate and with form mud backflow seam between the long limit air guide plate.

In one embodiment, the connection angle between the long-side air guide plate or the short-side air guide plate and the guide plate is 40-100 degrees.

In one embodiment, the three-phase separation reaction mechanism further comprises a nitrified liquid collecting pipe, one end of the nitrified liquid collecting pipe extends into the transitional biochemical region, the other end of the nitrified liquid collecting pipe extends into the anoxic tank, and the nitrified liquid collecting pipe is used for collecting nitrified liquid in the transitional biochemical region and quantitatively returning the nitrified liquid into the anoxic tank according to a preset proportion.

In one embodiment, the connection angle between the baffle plate and the baffle plate is 130-160 degrees;

and/or the flow baffle and the guide plate are arranged in parallel in the vertical direction.

In one embodiment, the three-phase separation reaction mechanism further comprises an air duct, one end of the air duct extends into the air collecting area, and the other end of the air duct extends to the outside of the aerobic tank.

In one embodiment, the three-phase separation reaction mechanism further comprises a water collecting pipe, one end of the water collecting pipe extends into the water collecting tank at the top of the aerobic tank, and the other end of the water collecting pipe extends into the high-efficiency flocculation sedimentation tank.

In one embodiment, the number of the three-phase separation reaction mechanisms is multiple, the three-phase separation reaction mechanisms are sequentially distributed in a row in the aerobic tank, the long-side gas guide plate and the short-side gas guide plate which are matched with each other are respectively arranged on the adjacent three-phase separation reaction mechanisms, and a sludge return seam is formed between the long-side gas guide plate and the long-side gas guide plate.

In one embodiment, at least two manhole partition plates are further arranged in the aerobic tank, one side edges of the manhole partition plates are connected with each other, two side edges of each manhole partition plate are connected with two adjacent inner walls of the aerobic tank respectively to form a manhole maintenance channel, the top of each manhole partition plate is higher than that of the aerobic tank, and the bottom of each manhole partition plate extends to the bottom biochemical region.

In one embodiment, the submerged HEBR bioreactor further comprises an anoxic tank, a communicating pipe and a stirring component, wherein the anoxic tank is communicated with the aerobic tank through the communicating pipe, the communicating pipe is positioned at the bottoms of the anoxic tank and the aerobic tank, and the stirring component is arranged in the anoxic tank.

In one embodiment, the submerged HEBR bioreactor further comprises a gas return pipe, one end of the gas return pipe extends into the anoxic tank, and the other end of the gas return pipe extends into the gas collecting area and is communicated with the gas guide pipe.

In one embodiment, a mixing tank is arranged in the anoxic tank, the nitrifying liquid collecting pipe extends into the mixing tank, the mixing tank is used for mixing the nitrifying liquid and sewage, and the top of the mixing tank is higher than that of the anoxic tank.

A sewage treatment system comprises a grid adjusting tank, a high-efficiency coagulating sedimentation tank, a sludge storage tank, a sludge dewatering device, an ultraviolet disinfection device and an immersed HEBR bioreactor, wherein the grid adjusting tank, the immersed HEBR bioreactor and the high-efficiency flocculating sedimentation tank are sequentially communicated; the immersed HEBR bioreactor is also communicated with the ultraviolet disinfection device and the sludge dewatering device; the sedimentation water of the high-efficiency flocculation sedimentation tank is treated by the ultraviolet disinfection device and then discharged up to the standard, and the residual sludge in the aerobic tank is discharged to the sludge dewatering device for dewatering treatment.

A sewage treatment method using the sewage treatment system comprises the following steps:

the sewage enters a grid regulating tank to remove coarse impurities in the sewage and regulate the water quality and/or water quantity of the water body to realize homogenization;

the homogenized sewage enters an anoxic tank for anoxic and anaerobic treatment, the sewage after the anoxic and anaerobic treatment enters a bottom biochemical zone of an aerobic tank from the bottom of the aerobic tank through a communicating pipe, and an aeration mechanism aerates to provide dissolved oxygen for microorganisms in the bottom biochemical zone of the aerobic tank so as to enable the sewage in the bottom biochemical zone to be in mixed contact with activated sludge;

the mud-water mixed liquid obtained after the reaction in the bottom biochemical area flows upwards; the mud-water mixed liquid and the rising bubbles generated by the aeration mechanism enter the transitional biochemical area through the flow guiding effect of the flow guiding plate;

the muddy water mixed liquid entering the transition biochemical region enters the solid-liquid separation region under the flow guiding action of the flow guiding groove, and the air in the rising bubbles is accumulated in the air collection region;

the sludge-water mixed liquid enters a solid-liquid separation zone, sludge in the sludge-water mixed liquid entering the solid-liquid separation zone is separated from the purified sewage under the action of gravity, the sludge flows back to the bottom biochemical zone under the action of self weight, and the purified sewage separated by the solid-liquid separation zone is collected by a water collecting pipe and then discharged to a high-efficiency flocculation sedimentation tank;

adding a flocculating agent according to the effluent quality of the water collecting pipe for flocculation treatment to remove total phosphorus, suspended matters and COD in the purified sewage;

the effluent of the high-efficiency flocculation sedimentation tank is treated by an ultraviolet disinfection device and then is discharged after reaching the standard;

and residual sludge in the aerobic tank and sludge in the efficient flocculation sedimentation tank are discharged to a sludge storage tank, and the sludge in the sludge storage tank is dewatered by a sludge dewatering device.

In one embodiment, the flocculating agent in the high-efficiency flocculation sedimentation tank is selected from one or more of ferric trichloride, polyaluminium chloride, polyacrylamide and polyferric sulfate.

Aiming at the problems in the prior art, the invention innovatively provides an immersed HEBR bioreactor, a sewage treatment system and a sewage treatment method thereof on the basis of an activated sludge process. The bioreactor integrates biochemical reaction, sedimentation, sludge backflow and mixed liquid backflow, and is a sewage treatment technology with compact structure, simple structure and convenient installation and maintenance. The immersed HEBR bioreactor provided by the invention jointly builds the three-phase separation reactor in the biochemical reaction tank and immerses the three-phase separation reactor below the liquid level of the aerobic tank, and improves the biomass and biological species of the aerobic tank by building high-concentration activated sludge in the biochemical tank, thereby enhancing the biochemical treatment efficiency of the aerobic tank.

The immersed HEBR bioreactor can effectively intercept rising bubbles generated by an aeration mechanism through the special structural design of the long-side air guide plate and the short-side air guide plate, effectively improves the effective utilization rate of dissolved oxygen in a bottom biochemical region, realizes unpowered backflow of biological sludge and nitrifying liquid, and effectively reduces the energy consumption of operation power. The bottom settling zone of the immersed HEBR bioreactor has large effective area, high impact load resistance and good mud-water separation effect, can effectively reduce the occupied area of a subsequent conventional coagulating sedimentation tank, and even does not need to arrange a secondary sedimentation tank according to the effluent requirement, thereby saving the direct investment cost.

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

(1) the solid-liquid separation zone, the diversion trench and the sludge backflow seam of the immersed HEBR high-efficiency three-phase composite bioreactor are mutually separated, and the overflowing mode cannot cause interference on sludge backflow to the bottom biochemical zone.

(2) The special structural design that the short-edge air guide plate and the long-edge air guide plate are partially overlapped and staggered can effectively intercept rising bubbles generated by the aeration mechanism from entering the solid-liquid separation area, so that the rising bubbles are prevented from entering the solid-liquid separation area and the solid-liquid separation effect is not influenced.

(3) All air supplies generated by the aeration mechanism are intercepted by the overlapped and staggered short-edge air guide plates and long-edge air guide plates and then are concentrated in the air collection area, so that the density of the muddy water mixed liquid in the air collection area is reduced, the muddy water mixture in the air collection area can be lifted to the mixing tank of the anoxic tank through the exhaust return pipe under the air lifting action formed by the density difference of the muddy water mixed liquid inside and outside the aerobic tank, secondary utilization of the air supplies of the aeration mechanism is realized while exhaust is realized, the operation energy consumption is reduced, and the operation cost is saved.

(4) The special structural design of the short-side air guide plate and the long-side air guide plate realizes the gas stripping backflow of the nitrified liquid, the gas stripping backflow to the nitrified liquid in the anoxic tank can realize the change of the dissolved oxygen concentration in the vertical direction of the anoxic tank, and the transition from the anoxic functional area to the anaerobic functional area of the anoxic tank is realized. In the anoxic functional zone, organic matters in the sewage are utilized to carry out denitrification reaction with the returned nitrifying liquid of the aerobic tank, so that nitrate nitrogen in the returned nitrifying liquid is removed, the adverse effect of the nitrate nitrogen on phosphorus removal in a subsequent anaerobic zone is eliminated, and the effect of nitrogen removal is achieved.

(5) The operation mode is flexible, the operation mode can be adjusted according to the quality of inlet water and the total nitrogen treatment requirement, the nitrified liquid can be refluxed without power on the premise that the air stripping reflux of the nitrified liquid meets the denitrification requirement, and the operation energy consumption is reduced.

(6) The immersed HEBR high-efficiency three-phase composite bioreactor cancels a gas release area of a traditional three-phase separation device, can effectively increase the effective area of a solid-liquid separation area, reduces the load of the operation surface, and improves the impact load of the immersed HEBR high-efficiency three-phase composite bioreactor.

(7) The immersed HEBR high-efficiency three-phase composite bioreactor can realize the self-reflux of sludge into the bottom biochemical region under the action of self weight, does not need power and has greatly low energy consumption in operation.

(8) The immersed HEBR high-efficiency three-phase composite bioreactor can be flexibly combined with other functional units or equipment for application, has good denitrification and dephosphorization effects, high treatment efficiency and simple operation and maintenance, and can realize convenient transportation and installation through systematic integrated design.

Drawings

FIG. 1 is a schematic view of a submerged HEBR high-efficiency three-phase composite bioreactor according to an embodiment of the present invention;

FIG. 2 is a schematic side sectional view of a submerged HEBR high-efficiency three-phase composite bioreactor according to an embodiment of the present invention;

FIG. 3 is a schematic top view of the submerged HEBR HE-T-PHR of FIG. 2;

FIG. 4 is a schematic side sectional view of a submerged HEBR high-efficiency three-phase composite bioreactor according to another embodiment of the present invention;

FIG. 5 is a schematic top view of the submerged HEBR high-efficiency three-phase composite bioreactor shown in FIG. 4.

Description of the reference numerals

10. An immersed HEBR high-efficiency three-phase composite bioreactor; 100. an aerobic tank; 110. a bottom biochemical region; 120. a transitional biochemical region; 130. a solid-liquid separation zone; 140. a gas-liquid flow guide area; 150. a gas collection zone; 160. a manhole maintenance channel; 200. an aeration mechanism; 300. a three-phase separation reaction mechanism; 310. a partition support; 320. a barrier plate; 330. a baffle; 340. a flow baffle plate; 350. a long-side air guide plate; 360. a short side air guide plate; 370. a nitrified liquid collecting pipe; 380. an air duct; 390. a flow guide channel; 3100. sludge backflow seam; 3110. an exhaust gas return pipe; 3120. a water collection pipe; 400. an anoxic tank; 410. a mixing tank; 500. a communicating pipe; 600. and a stirring member.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

In the description of the present invention, it should be understood that the terms used in the present invention are used in the description of the present invention, and it should be understood that the directions or positional relationships indicated by the terms "center", "upper", "lower", "bottom", "inner", "outer", etc. in the present invention are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, which are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening elements, or they may be in communication within two elements, i.e., when an element is referred to as being "secured to" another element, it may be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

An embodiment of the present invention provides an immersed HEBR (High Efficiency three-phase composition Bioreactor).

Referring to fig. 1 and 2, a submerged HEBR bioreactor includes an aerobic tank 100, an aeration mechanism 200, and a three-phase separation reaction mechanism 300.

The aeration mechanism 200 is arranged at the bottom of the aerobic tank 100, and the bottom of the aerobic tank 100 is provided with activated sludge. The bottom of the aerobic tank 100 is provided with a liquid inlet.

The aeration mechanism 200 comprises an aeration pipeline and an aerator, the aerator can adopt modes such as a micropore aeration disc, a tubular micropore aerator or a perforated aeration pipe for aeration, and the like, and the aeration mechanism 200 provides dissolved oxygen required by microorganisms and ensures that sewage and activated sludge in a biochemical reaction area are uniformly mixed and contacted. Preferably, the aeration mechanism 200 adopts a microporous aeration disc for aeration; the air required by the aeration mechanism 200 may be provided by one or more fans.

Referring to FIG. 2, the three-phase separation reaction mechanism 300 includes a partition support 310, a baffle 320, a baffle 330, and a baffle 340. In use, the three-phase separation reaction mechanism 300 is submerged below the liquid level of the aerobic tank 100. The partition supporting member 310 is disposed inside the aerobic tank 100, and both ends in the axial direction of the partition supporting member are respectively connected to the first inner wall and the second inner wall of the aerobic tank 100, and the bottom biochemical region 110 is formed in the lower region of the partition supporting member 310. The blocking plate 320 is located above the partition supporting member 310, and both ends in the axial direction of the blocking plate 320 are connected to the first inner wall and the second inner wall of the aerobic tank 100, which are opposite to each other, and both sides of the blocking plate 320 are bent toward the partition supporting member 310.

The partition supporting member 310 is connected to the guide plates 330 at both axial sides thereof. The upper and lower sides of the baffle 330 protrude from the partition supporting member 310, respectively.

The gas collection region 150 is formed between the blocking plate 320 and the partition support 310 in the region close to the blocking plate 320, and the transition biochemical region 120 is formed in the region close to the partition support 310; in the present invention, the biochemical reaction zone in the aerobic tank 100 is divided into a bottom biochemical zone 110 and a transition biochemical zone 120.

Referring to fig. 2, two sides of the blocking plate 320 are respectively connected to a flow blocking plate 340. The upper end of the baffle 330 is not lower than the upper end of the baffle 340 and is not connected with the baffle 320. The angle at which both sides of the blocking plate 320 are bent toward the partition support 310 may be set such that the gas collecting region 150 may be formed in one of a trapezoid shape, a triangle shape, or a polygonal shape.

The flow baffle 340 extends to protrude out of the partition support 310 towards the bottom biochemical region 110, a flow guide channel 390 communicating the bottom biochemical region 110 and the transitional biochemical region 120 is formed between the flow baffle 340 and the baffle 320, and the solid-liquid separation region 130 is formed between the flow baffle 340 and the inner wall of the aerobic tank 100. The solid-liquid separation zone 130 can be realized in various different forms, including a common precipitation separation zone, and the solid-liquid separation is realized only by the gravity reflux of the sludge; or, a filter material filler can be arranged in the solid-liquid separation zone 130 to enhance the mud-water separation effect, wherein the filter material filler comprises at least one of a fiber ball soft filter material, an activated carbon modified sponge filter material, an inclined plate and an inclined tube filter material.

In a specific example, the three-phase separation reaction mechanism 300 further includes a long-side air guide plate 350 and a short-side air guide plate 360. The bottom of the guide plate 330 on both sides of the partition supporting member 310 is connected with a long side air guide plate 350 or a short side air guide plate 360, respectively. The long side air guide plate 350 and the short side air guide plate 360 both extend toward the bottom biochemical region 110, and the long side air guide plate 350 or the short side air guide plate 360 on the guide plate 330 on both sides of the partition support 310 are away from each other. Be connected with on the inner wall of good oxygen pond 100 with long limit air guide plate 350 complex minor face air guide plate 360, or with the long limit air guide plate 350 of minor face air guide plate 360 complex, the terminal directional long limit air guide plate 350 that corresponds of minor face air guide plate 360 and with long limit air guide plate 350 between form mud backflow seam 3100, also be that minor face air guide plate 360 or long limit air guide plate 350 one end and the guide plate 330 of being connected, the other end extends to the downside, 360 adjacent minor face air guide plates and long limit air guide plate 350 form staggered structure but contactless, the mud backflow seam 3100 that the clearance between 360 and the long limit air guide plate 350 of minor face air guide plate has constituted. The long-side gas guide plate 350 and the short-side gas guide plate 360 constitute the gas-liquid flow guide area 140.

Preferably, the structure formed by one side of the baffle 320 and the connected baffle 340 is mirror symmetric to the structure formed by the baffle 330 and the connected long-side air guide plate 350 or short-side air guide plate 360.

The sludge-water mixed liquid after full contact reaction in the bottom biochemical region 110 gradually flows up to the gas-liquid flow guiding region 140, and the ascending bubbles generated by the aeration mechanism 200 can be effectively intercepted to enter the solid-liquid separation region 130 by utilizing the staggered special structural design of the short-side gas guide plate 360 and the long-side gas guide plate 350; and because the short side air guide plate 360 and the long side air guide plate 350 have mutually overlapped parts, the slurry-water mixed liquid and the intercepted ascending bubbles enter the transition biochemical region 120 through the flow guiding effect of the flow guide plate 330, so that the ascending bubbles can be ensured not to flow into the solid-liquid separation region 130 to influence the effect of slurry-water separation.

The immersed HEBR bioreactor can effectively intercept rising bubbles generated by the aeration mechanism 200 through the special structural design of the long-side air guide plate 350 and the short-side air guide plate 360, effectively improves the effective utilization rate of dissolved oxygen in the bottom biochemical region 110, realizes unpowered backflow of biological sludge and nitrifying liquid, and effectively reduces the energy consumption of operation power. The solid-liquid separation zone of the immersed HEBR bioreactor has large effective area, high impact load resistance and good mud-water separation effect, can effectively reduce the occupied area of a subsequent conventional coagulating sedimentation tank, even does not need to arrange a secondary sedimentation tank according to the effluent requirement, and saves direct investment cost.

In a specific example, the long side air guide 350 or the short side air guide 360 is connected to the baffle 330 at an angle of 40 ° to 100 °.

In a specific example, the three-phase separation reaction mechanism 300 further includes a nitrified liquid collecting pipe 370. One end of the nitrified liquid collecting pipe 370 extends into the transitional biochemical region 120 and the other end extends into the anoxic tank 400, and the nitrified liquid collecting pipe 370 is used for collecting nitrified liquid in the transitional biochemical region 120 and quantitatively reflows into the anoxic tank 400 according to a preset proportion so as to complete denitrification and achieve the aim of denitrification.

In one specific example, the connection angle between the baffle 320 and the baffle 340 is 130-160 °; and/or, the baffle 340 is disposed vertically parallel to the baffle 330.

In a specific example, the three-phase separation reaction mechanism 300 further comprises a gas-guide tube 380. One end of the air duct 380 extends into the air collecting area 150, and the other end of the air duct 380 extends to the outside of the aerobic tank 100.

Particularly, all the air supplies of the aeration mechanism 200 are intercepted by the staggered short-side air guide plates 360 and the long-side air guide plates 350 and then concentrated in the air collecting area 150, so that the density of the nitrified liquid in the air collecting area 150 is reduced, the air stripping effect formed by the density difference of the internal and external mixed liquid can extend and lift the nitrified liquid in the air collecting area 150 to the mixing tank 410 through the exhaust return pipe 3110, the nitrified liquid is uniformly mixed with raw water and then enters the anoxic tank, partial return of the nitrified liquid is realized during air exhaust, and the flow ratio of the nitrified liquid return pump can be effectively reduced, the operation energy consumption is reduced, and the operation cost is saved while the secondary utilization of the air supplies of the aeration mechanism 200 is realized.

Particularly, according to the invention, due to the special structural design of the short-side air guide plate 360 and the long-side air guide plate 350, the air stripping backflow of the nitrified liquid is realized, the nitrified liquid which is stripped and refluxed to the anoxic tank 400 can realize the change of the dissolved oxygen concentration in the vertical direction of the anoxic tank 400, and the transition of the anoxic tank 400 from an anoxic function area to an anaerobic function area is presented. In the anoxic functional zone, organic matters in the sewage are utilized to carry out denitrification reaction with the returned nitrifying liquid in the aerobic tank 100, so that nitrate nitrogen in the returned nitrifying liquid is removed, the adverse effect of the nitrate nitrogen on phosphorus removal in a subsequent anaerobic zone is eliminated, and the effect of nitrogen removal is achieved. In the anaerobic functional area, activated sludge releases phosphorus anaerobically to synthesize PHB (poly beta-phosphorus butyrate). In the aerobic zone, organic pollutants are decomposed into carbon dioxide and water by microorganisms in the filler or the sludge; PHB is aerobically decomposed, phosphorus-accumulating bacteria proliferate and absorb phosphorus, the phosphorus absorption amount in the stage is far larger than the release amount of phosphorus in an anaerobic zone, and sludge absorbing phosphorus is discharged in the form of excess sludge to achieve the aim of removing phosphorus.

In a specific example, the top of the aerobic tank 100 is provided with a water collecting tank. One end of the water collecting pipe 3120 extends into the water collecting tank, and the other end of the water collecting pipe 3120 extends into the high-efficiency flocculation sedimentation tank.

In one embodiment, referring to fig. 1 and 2, the number of the three-phase separation reaction mechanisms 300 is plural, and each three-phase separation reaction mechanism 300 is located at the same height. The three-phase separation reaction mechanisms 300 are sequentially distributed in a row in the aerobic tank 100, the long-side air guide plate 350 and the short-side air guide plate 360 which are matched with each other are respectively arranged on the adjacent three-phase separation reaction mechanisms 300, and a sludge backflow seam 3100 is formed between the long-side air guide plate 350 and the long-side air guide plate 350.

The flow baffle 340 and the baffle 320 of the adjacent three-phase separation reaction mechanism 300 form the solid-liquid separation zone 130, and the solid-liquid separation zone 130 is also formed between the flow baffle 340, the baffle 320 and the inner wall of the aerobic tank 100 of the three-phase separation reaction mechanism 300 at the edge position.

The three-phase separation reaction mechanism 300 (including the partition support 310, the blocking plate 320, the guide plate 330, the flow blocking plate 340, the long-side air guide plate 350, and the short-side air guide plate 360) may be made of a material selected from carbon steel, stainless steel, PP (polypropylene), and the like, and particularly, according to different corrosivity of sewage, the carbon steel material may be subjected to anticorrosion treatment in a form of finish anticorrosion, polyurethane coating anticorrosion, polyurea coating anticorrosion, or the like.

In a specific example, at least two manhole partitions are also provided in the aerobic tank 100. Preferably, the number of the two manhole separating plates is two, one side edges of the two manhole separating plates are connected with each other, and the two manhole separating plates are vertically arranged at 90 degrees. Two side edges of the manhole partition plate are respectively connected with two adjacent inner walls of the aerobic tank 100 to form a manhole maintenance channel, the top of the manhole partition plate is higher than the top of the aerobic tank 100, and the bottom of the manhole partition plate extends to the bottom biochemical region 110. Or the manhole clapboard has the upper end higher than the liquid level of the aerobic tank 100 and is flush with the top end of the aerobic tank 100, and the lower end extends to penetrate through the long-edge air guide plate 350 to form a manhole access channel 160.

In another embodiment, referring to fig. 4 and 5, the submerged HEBR bioreactor further comprises an anoxic tank 400, a communicating pipe 500, and a stirring member 600. The anoxic tank 400 is communicated with the aerobic tank 100 through a communicating pipe 500, the communicating pipe 500 is positioned at the bottoms of the anoxic tank 400 and the aerobic tank 100, and the stirring part 600 is arranged in the anoxic tank 400. The stirring component 600 ensures that the sludge concentration in the vertical direction of the anoxic tank 400 is uniform, and the stirring component 600 can adopt a mechanical stirring or pneumatic stirring mode; the mechanical stirring is preferably paddle stirring, frame stirring or diving stirring, and the paddle stirring and the frame stirring can be provided with two layers or three layers of paddles or paddle boards according to the effective water depth and the pool capacity. In order to ensure the concentration of dissolved oxygen in the anoxic tank, an intermittent aeration mode is required for pneumatic stirring, and the aeration interval time and the aeration duration need to be adjusted and determined on site.

Preferably, the anoxic tank 400 is preferably mechanically stirred, and in order to ensure the distribution of the functional zones in the vertical direction of the anoxic tank 400, the stirring part 600 in the mechanical stirring mode needs to be provided with a frequency converter to adjust the rotating speed.

According to the invention, due to the special structural design of the short-side air guide plate 360 and the long-side air guide plate 350, the air stripping backflow of the nitrified liquid is realized, the nitrified liquid which flows back to the anoxic tank 400 can realize the change of the dissolved oxygen concentration in the vertical direction of the anoxic tank 400, and the transition of the anoxic tank 400 from an anoxic function area to an anaerobic function area is presented.

In one embodiment, referring to FIG. 3, the submerged HEBR bioreactor further includes a return exhaust pipe 3110. One end of the exhaust gas return pipe 3110 extends into the mixing tank 410 of the anoxic tank 400, and the exhaust gas return pipe, which is short of description, returns into the manhole of the aerobic tank. If the anoxic tank 400 is connected in front of the submerged HEBR high-efficiency three-phase composite bioreactor 10, the exhaust gas return pipe 3110 directly returns to the mixing tank 410 of the anoxic tank 400, and if the anoxic tank 400 is not connected in front of the submerged HEBR high-efficiency three-phase composite bioreactor 10, the exhaust gas return pipe 3110 directly returns to the manhole maintenance channel of the aerobic tank.

The other end extends into the gas collection area 150 and communicates with the gas conduit 380. The air supply of the aeration mechanism 200 is intercepted by the staggered short-side air guide plates 360 and the long-side air guide plates 350 and then is concentrated in the air collection area 150, so that the density of the nitrified liquid in the air collection area 150 is reduced, the air stripping effect formed by the density difference between the inside and the outside of the aerobic tank 100 can extend and lift the nitrified liquid in the air collection area 150 to the mixing tank 410 of the anoxic tank 400 through the exhaust return pipe 3110, the nitrified liquid is uniformly mixed with sewage and then enters the anoxic tank 400, the back flow of the nitrified liquid is realized while exhausting, the flow ratio of the nitrified liquid return pump can be effectively reduced while the secondary utilization of the air supply of the aeration mechanism 200 is realized, the operation energy consumption is.

In one embodiment, referring to fig. 3, a mixing tank 410 is provided within the anoxic tank 400. The nitrification liquid collecting pipe 370 extends into the mixing tank 410, the mixing tank 410 is used for mixing the nitrification liquid and the sewage, and the top of the mixing tank 410 is higher than the top of the anoxic tank 400. In the practical use process, the upper end of the mixing tank 410 is 20-60cm higher than the liquid level, and the lower end of the mixing tank 410 is 30-60cm lower than the liquid level.

In the biochemical reaction zone in the aerobic tank 100 of the present invention, organic pollutants in the sewage are decomposed into carbon dioxide and water by microorganisms in the sludge; PHB (poly beta-phosphorus-accumulating butyric acid) is aerobically decomposed, phosphorus-accumulating bacteria proliferate and absorb phosphorus, the phosphorus absorption amount in the stage is far larger than the release amount of phosphorus in an anaerobic zone, and sludge absorbing phosphorus is discharged in the form of residual sludge to achieve the aim of removing phosphorus; nitrifying bacteria in the biochemical reaction zone convert ammonia nitrogen in the sewage into nitrate nitrogen through nitrification, and nitrifying liquid flows back into the anoxic zone of the anoxic tank 400 to be converted into nitrogen through denitrification of denitrifying bacteria for removal.

Aiming at the problems in the prior art, the invention innovatively provides an immersed HEBR bioreactor, a sewage treatment system and a sewage treatment method thereof on the basis of an activated sludge process. The bioreactor integrates biochemical reaction, sedimentation, sludge backflow and mixed liquid backflow, and is a sewage treatment technology with compact structure, simple structure and convenient installation and maintenance. The immersed HEBR bioreactor provided by the invention jointly builds a three-phase separation reactor in a biochemical reaction tank and is immersed below the liquid level of the aerobic tank 100, and the biomass and biological species of the aerobic tank 100 are improved by constructing high-concentration activated sludge in the biochemical tank, so that the biochemical treatment efficiency of the aerobic tank 100 is enhanced.

The embodiment of the invention also provides a sewage treatment system.

A sewage treatment system comprises a grid adjusting tank, an anoxic tank, a high-efficiency coagulating sedimentation tank, a sludge storage tank, a sludge dewatering device, an ultraviolet disinfection device and the immersed HEBR bioreactor of any one of claims 1 to 11, wherein the grid adjusting tank, the immersed HEBR bioreactor and the high-efficiency flocculating sedimentation tank are sequentially communicated; the immersed HEBR bioreactor is also communicated with an ultraviolet disinfection device and a sludge dewatering device; the sedimentation water of the high-efficiency flocculation sedimentation tank is treated by the ultraviolet disinfection device and then discharged up to the standard, and the residual sludge in the aerobic tank is discharged to the sludge dewatering device for dewatering treatment. The grid adjusting tank, the high-efficiency coagulating sedimentation tank, the sludge storage tank, the sludge dewatering device and the ultraviolet disinfection device are not shown in the attached drawings.

Alternatively, the high efficiency flocculation sedimentation tank can be a tube settler, a vertical flow settler or other types of settler.

In a specific example, the flocculating agent in the high-efficiency flocculation sedimentation tank is selected from one or more of ferric trichloride, polyaluminium chloride, polyacrylamide and polyferric sulfate.

The embodiment of the invention also provides a sewage treatment method.

and the sewage enters a grid regulating tank to remove coarse impurities in the sewage and regulate the water quality and/or water quantity of the water body to realize homogenization.

The homogenized sewage enters the anoxic tank 400 for anoxic treatment, the sewage after the anoxic treatment enters the bottom biochemical zone 110 of the aerobic tank 100 from the bottom of the aerobic tank 100 through the communicating pipe 500, and the aeration mechanism 200 provides dissolved oxygen for microorganisms in the bottom biochemical zone 110 through aeration so that the sewage in the bottom biochemical zone 110 is in mixed contact with activated sludge.

The sludge-water mixed liquid obtained after the reaction in the bottom biochemical region 110 gradually flows up to the gas-liquid flow guiding region 140, and the staggered structure of the short-side gas guiding plate 360 and the long-side gas guiding plate 350 is utilized to effectively intercept rising bubbles generated by the aeration mechanism 200 and prevent the rising bubbles from entering the solid-liquid separation region 130 to influence the solid-liquid separation effect; the slurry-water mixture and the rising bubbles generated by the aeration mechanism 200 enter the transition biochemical region 120 through the diversion of the diversion plate 330.

The nitrified liquid entering the transition biochemical region 120 enters the solid-liquid separation region 130 under the guiding action of the guiding gutter, the air in the rising bubbles is accumulated in the air collecting region 150, and the air accumulated in the air collecting region 150 is discharged through the air duct 380 and the exhaust return pipe 3110.

The air supply of the aeration mechanism 200 is intercepted by the short side air guide plates 360 and the long side air guide plates 350 which are arranged in a staggered way and then is concentrated in the air collection area 150, the density of the nitrified liquid in the air collection area 150 is reduced by the accumulated air, and the nitrified liquid in the air collection area 150 can be lifted to the mixing tank 410 of the anoxic tank 400 through the exhaust return pipe 3110 by the air stripping action formed by the density difference between the inside and the outside of the aerobic tank 100.

The nitrified liquid in the transitional biochemical region 120 quantitatively flows back into the anoxic tank 400 through the nitrified liquid collecting pipe 370 and the nitrified liquid reflux pump according to a preset proportion, and the denitrification is completed to achieve the aim of denitrification.

The lower end of the flow baffle 340 is higher than the lower end of the flow baffle 330 to form a buffer layer for the slurry-water mixed liquid outlet, so as to avoid the interference of the slurry-water mixed liquid at the lower layer of the flow baffle 340 to affect the slurry-water separation effect.

The sludge-water mixed liquid enters the solid-liquid separation zone 130 through the diversion trench, sludge in the sludge-water mixed liquid entering the solid-liquid separation zone 130 is separated from purified sewage under the action of gravity, the sludge flows back to the bottom biochemical zone 110 through the sludge backflow seam 3100 along the short-side air guide plate 360 or the long-side air guide plate 350 under the action of self-gravity, the solid-liquid separation zone 130 can realize sludge-water separation and sludge self-backflow so as to maintain the concentration of the sludge in the bottom biochemical zone 110, the sludge backflow device and the operation energy consumption are saved, and the purified sewage separated by the solid-liquid separation zone 130 is collected by the water collecting pipe 3120 and then discharged to the efficient flocculation sedimentation tank.

Adding a flocculating agent according to the effluent quality of the water collecting pipe 3120 for flocculation treatment to remove total phosphorus, suspended matters and COD pollutants in the purified sewage, and ensure that the effluent meets the discharge standard; the flocculating agent is selected from one or more of ferric trichloride, polyaluminium chloride, polyacrylamide and polyferric sulfate.

The effluent of the high-efficiency flocculation sedimentation tank is treated by an ultraviolet disinfection device and then is discharged after reaching the standard.

And discharging the residual sludge in the aerobic tank 100 and the sludge in the efficient flocculation sedimentation tank to a sludge storage tank, and dehydrating the sludge in the sludge storage tank by using a sludge dehydration device.

(1) the solid-liquid separation zone 130, the diversion trench and the sludge backflow seam 3100 of the immersed HEBR high-efficiency three-phase composite bioreactor 10 are separated from each other, and the overflowing mode does not interfere the sludge backflow to the bottom biochemical zone 110.

(2) The special structural design that the short-edge air guide plate 360 and the long-edge air guide plate 350 are partially overlapped and staggered can effectively intercept rising bubbles generated by the aeration mechanism 200 from entering the solid-liquid separation zone 130, so that the rising bubbles are prevented from entering the solid-liquid separation zone 130 and the solid-liquid separation effect is not influenced.

(3) All the supplied air generated by the aeration mechanism 200 is intercepted by the short-side air guide plates 360 and the long-side air guide plates 350 which are overlapped and staggered and then is concentrated in the air collection area 150, so that the density of the muddy water mixed liquid in the air collection area 150 is reduced, the muddy water mixture in the air collection area 150 can be lifted to the mixing tank 410 of the anoxic tank 400 through the air stripping action formed by the density difference of the muddy water mixed liquid inside and outside the aerobic tank 100 through the exhaust return pipe 3110, secondary utilization of the supplied air of the aeration mechanism 200 is realized while air is exhausted, the operation energy consumption is reduced, and the operation cost is saved.

(6) The immersed HEBR high-efficiency three-phase composite bioreactor 10 cancels a gas release area of a traditional three-phase separation device, can effectively increase the effective area of the solid-liquid separation area 130, reduces the operation surface load, and improves the impact load of the immersed HEBR high-efficiency three-phase composite bioreactor 10.

(7) The immersed HEBR high-efficiency three-phase composite bioreactor 10 can realize the self-backflow of sludge into the bottom biochemical region 110 under the action of self weight, does not need power and has greatly low energy consumption in operation.

(8) The immersed HEBR high-efficiency three-phase composite bioreactor 10 can be flexibly combined with other functional units or equipment for application, has good denitrification and dephosphorization effects, high treatment efficiency and simple operation and maintenance, and can realize convenient transportation and installation through systematic integrated design.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An immersed HEBR bioreactor, which is characterized by comprising an aerobic tank, an aeration mechanism and a three-phase separation reaction mechanism, wherein the aeration mechanism is arranged at the bottom of the aerobic tank, the bottom of the aerobic tank is provided with a liquid inlet, the three-phase separation reaction mechanism comprises a partition support piece, a baffle plate and a baffle plate, the partition support piece is arranged in the aerobic tank, two ends in the axial direction of the partition support piece are respectively connected with a first inner wall and a second inner wall which are opposite to the aerobic tank, a bottom biochemical zone is formed in the lower area of the partition support piece, the baffle plate is positioned above the partition support piece, two ends in the axial direction of the baffle plate are respectively connected with the first inner wall and the second inner wall, two sides of the baffle plate are respectively bent downwards, two sides in the axial direction of the partition support piece are respectively connected with the baffle plate, and the upper and lower sides of the baffle plate are, the gas collection area is formed between the blocking plate and the partition supporting piece and close to the area of the blocking plate, the area between the guide plates connected with the two sides of the partition supporting piece forms a transition biochemical area, the two sides of the blocking plate are respectively connected with the flow baffle plates, the flow baffle plates extend to protrude out of the partition supporting piece towards the bottom biochemical area, a flow guide channel used for communicating the bottom biochemical area with the transition biochemical area is formed between the flow baffle plates and the blocking plate, and a solid-liquid separation area is formed between the flow baffle plates and the inner wall of the aerobic tank and between the adjacent flow baffle plates.

2. The submerged HEBR bioreactor according to claim 1, wherein said three-phase separation reaction mechanism further comprises a long side air guide plate and a short side air guide plate, the bottoms of said guide plates at both sides of said partition support member are respectively connected with said long side air guide plate or said short side air guide plate, said long side air guide plate and said short side air guide plate both extend towards said bottom biochemical region, said long side air guide plate or said short side air guide plate on said guide plates at both sides of said partition support member are mutually far away, said inner wall of said aerobic tank is connected with said short side air guide plate cooperating with said long side air guide plate or said long side air guide plate cooperating with said short side air guide plate, and the end of said short side air guide plate points to the corresponding long side air guide plate and forms a sludge backflow seam with said long side air guide plate.

3. The submerged HEBR bioreactor according to claim 2, wherein the angle of the connection of the long or short gas guiding plates to the deflector is between 40 ° and 100 °.

4. The submerged HEBR bioreactor according to claim 1, wherein the three-phase separation reaction mechanism further comprises a nitrification liquid collection pipe, one end of the nitrification liquid collection pipe extends into the transitional biochemical region and the other end of the nitrification liquid collection pipe extends into the anoxic tank, and the nitrification liquid collection pipe is used for collecting nitrification liquid in the transitional biochemical region and quantitatively returning the nitrification liquid into the anoxic tank according to a preset proportion.

5. The submerged HEBR bioreactor according to claim 1, wherein the baffle is connected to the baffle at an angle of 130 ° to 160 °;

6. The submerged HEBR bioreactor of claim 1, wherein the three-phase separation reactor further comprises a gas duct, one end of the gas duct extending into the gas collection zone and the other end of the gas duct extending outside the aerobic tank.

7. The submerged HEBR bioreactor of claim 1, further comprising a header pipe, one end of which extends into a header tank at the top of the aerobic tank, and the other end of which extends into the high efficiency flocculation settling tank.

8. A submerged HEBR bioreactor according to any one of claims 2 to 7, wherein the number of the three-phase separation reaction mechanisms is multiple, the three-phase separation reaction mechanisms are sequentially distributed in the aerobic tank in a row, the long-side gas guide plate and the short-side gas guide plate which are mutually matched are respectively arranged on the adjacent three-phase separation reaction mechanisms, and a sludge return seam is formed between the long-side gas guide plate and the long-side gas guide plate.

9. An immersed HEBR bioreactor according to any one of claims 1-7, wherein at least two manhole partition plates are further arranged in the aerobic pool, one side of each manhole partition plate is connected with each other, two side edges of each manhole partition plate are respectively connected with two adjacent inner walls of the aerobic pool to form a manhole maintenance channel, the top of each manhole partition plate is higher than the top of the aerobic pool, and the bottom of each manhole partition plate extends to the bottom biochemical region.

10. A submerged HEBR bioreactor according to any of claims 1 to 7, further comprising an anoxic tank, a communication pipe and a stirring member, wherein the anoxic tank is in communication with the aerobic tank through the communication pipe, the communication pipe is located at the bottom of the anoxic tank and the aerobic tank, and the stirring member is disposed in the anoxic tank.

11. The submerged HEBR bioreactor of claim 10, further comprising an exhaust return conduit extending into the anoxic tank at one end and into the plenum at the other end and in communication with an air duct.

12. The submerged HEBR bioreactor according to claim 10, wherein a mixing tank is provided in the anoxic tank, the nitrifying liquid collecting pipe extends into the mixing tank, the mixing tank is used for mixing the nitrifying liquid and the sewage, and the top of the mixing tank is higher than the top of the anoxic tank.

13. A sewage treatment system is characterized by comprising a grid adjusting tank, a high-efficiency coagulating sedimentation tank, a sludge storage tank, a sludge dewatering device, an ultraviolet disinfection device and the immersed HEBR bioreactor as claimed in any one of claims 1 to 12, wherein the grid adjusting tank, the immersed HEBR bioreactor and the high-efficiency flocculating sedimentation tank are sequentially communicated; the immersed HEBR bioreactor is also communicated with the ultraviolet disinfection device and the sludge dewatering device; the sedimentation water of the high-efficiency flocculation sedimentation tank is treated by the ultraviolet disinfection device and then discharged up to the standard, and the residual sludge in the aerobic tank is discharged to the sludge dewatering device for dewatering treatment.

14. A sewage treatment method using the sewage treatment system according to claim 13, comprising the steps of:

the sewage after homogenization enters an anoxic tank for anoxic treatment, the sewage after the anoxic treatment enters a bottom biochemical area of the aerobic tank from the bottom of the aerobic tank through a communicating pipe, and an aeration mechanism aerates to provide dissolved oxygen for microorganisms in the bottom biochemical area of the aerobic tank so as to enable the sewage in the bottom biochemical area to be in mixed contact with activated sludge;

15. The sewage treatment method of claim 14, wherein the flocculating agent in the high-efficiency flocculation sedimentation tank is one or more selected from ferric trichloride, polyaluminium chloride, polyacrylamide and polyferric sulfate.