CN218786554U

CN218786554U - Anaerobic reactor of marsh gas inner loop

Info

Publication number: CN218786554U
Application number: CN202223404474.1U
Authority: CN
Inventors: 刘立栋; 李仲伟; 薛蔚琦; 李玉龙; 姜维
Original assignee: China Resources Shenzhen Bay Development Co ltd Science And Technology Research Branch; China Resources Environmental Protection Development Co ltd; Shenzhen Research Institute Tsinghua University
Current assignee: China Resources Shenzhen Bay Development Co ltd Science And Technology Research Branch; China Resources Environmental Protection Development Co ltd; Shenzhen Research Institute Tsinghua University
Priority date: 2022-12-19
Filing date: 2022-12-19
Publication date: 2023-04-04
Anticipated expiration: 2032-12-19

Abstract

The utility model discloses an anaerobic reactor of marsh gas inner loop relates to sewage treatment technical field. The anaerobic reactor comprises a reactor body, wherein the reactor body comprises a reaction zone and a precipitation zone which are sequentially connected, a partition plate is arranged in the reaction zone, and an aeration stirring device is arranged at the bottom of a reaction tank; the sedimentation zone comprises a steady flow gas release zone and a mud-water separation zone which are sequentially arranged, the reaction zone is communicated with the top of the steady flow gas release zone, and the steady flow gas release zone is communicated with the bottom of the mud-water separation zone; the steady flow gas release area is a structure with a narrow upper part and a wide lower part, and inclined tube packing or inclined plate packing is arranged in the mud-water separation area. The utility model discloses can solve current anaerobic reactor and can not compromise the problem of higher processing efficiency, abundant muddy water mixture and stable mud-water separation effect under the operation of high processing load condition.

Description

Anaerobic reactor of marsh gas inner loop

Technical Field

The utility model relates to a sewage treatment technical field especially relates to an anaerobic reactor of marsh gas inner loop.

Background

Highly organically polluted wastewater is usually treated by anaerobic biotechnology, and a typical anaerobic reactor comprises a water inlet distribution system, a reaction zone, a three-phase separator and a water outlet system. The wastewater enters the reactor through the water inlet and distribution system to flow from bottom to top, fully contacts anaerobic sludge in the reaction zone, the anaerobic microorganisms degrade organic pollutants and generate methane, the sludge and the water continue to move upwards after forming a sludge and water-gas mixed solution, the three-phase separator is used for separating sludge, water, gas and three-phase substances, the sludge is deposited and falls back to the reaction zone, the gas is upwards collected to the gas collection chamber, and the sewage is discharged out of the reactor through the water outlet system.

The good stable operation of the anaerobic reactor and the maintenance of the microorganism shape in the reactor depend on good mud-water mixed mass transfer effect, the water quality and the water quantity of the incoming water are changed, the actual operation is restricted by the water inlet load, particularly, the gas production is reduced when the reactor is operated in off season, and the sufficient hydraulic shear is difficult to provide by only depending on the gas production of the system, so that the traditional anaerobic reactor has higher design requirement on a water distribution system, a high-power water inlet pump is relied on to ensure a certain water inlet ascending flow velocity, or an EGSB (expanded granular sludge bed) reactor adopts an external mechanical pump to carry out water outlet internal reflux, and additional hydraulic ascending scouring is provided, but the problems of easy blockage, difficult maintenance and high energy consumption exist in the actual operation of the measures.

In addition, the traditional anaerobic reactor is basically a completely mixed type integrated reactor, the reaction zone and the three-phase separator are in the same space, the position relationship is an up-down relationship, the three-phase separator is positioned above the reaction zone and limited by the narrow slit flow velocity, the sludge-water separation effect is easily interfered by gas production and rising flow velocity, and sludge loss is easily caused. It has been mentioned that the reactor needs sufficient ascending flow velocity to ensure sufficient hydraulic shearing, but because of the limitation of the three-phase separator, the actual ascending flow velocity of the reactor cannot be too high, the reactor is required to be increased inevitably in design, the reaction zone and the three-phase separator are ensured to have sufficient distance to reduce interference, the effective reaction space of the reactor is less than 40%, the effective volume utilization rate is low, even if the design of carrying out upper and lower two-stage reaction and sectionally collecting biogas like an IC (internal circulation) reactor, the treatment efficiency of the second reaction zone (upper layer) is very general, and still is a space waste. How to maximize the utilization of the reaction space and give consideration to the high-efficiency sludge-water separation is a major bottleneck for further improving the load of the anaerobic reactor and developing the high-load anaerobic reactor.

Under the background of the national strongly-promoted dual-carbon policy of carbon peak reaching and carbon neutralization, the improvement of the load of the anaerobic reactor and the yield of methane are important measures for recycling sewage treatment energy, and the improvement depends on the innovation and breakthrough of the existing equipment and the development of a more efficient anaerobic reactor.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model aims at providing a marsh gas inner loop's anaerobic reactor solves current anaerobic reactor and can not compromise the problem of higher processing efficiency, abundant muddy water mixture and stable mud-water separation effect under the operation of high processing load condition. The utility model aims at realizing through the following technical scheme:

provides an anaerobic reactor with biogas internal circulation, which comprises a reactor body, wherein the reactor body comprises a reaction zone and a precipitation zone which are connected in sequence,

the reaction zone is internally provided with a partition plate, and the bottom of the reaction tank is provided with an aeration stirring device;

the settling zone comprises a steady flow gas releasing zone and a mud-water separation zone which are sequentially arranged, the reaction zone is communicated with the top of the steady flow gas releasing zone, and the steady flow gas releasing zone is communicated with the bottom of the mud-water separation zone; the steady flow air release area is a structure with a narrow upper part and a wide lower part, and inclined tube packing or inclined plate packing is arranged in the mud-water separation area.

Preferably, the aeration stirring device is a perforated aeration hose.

Preferably, a first partition plate is arranged between the water inlet mixing zone and the reaction zone, a second partition plate is arranged between the reaction zone and the precipitation zone, a first overflowing opening is formed in the bottom of the first partition plate, and a second overflowing opening is formed in the top of the second partition plate.

Furthermore, the division board be a plurality of, the division board sets up side by side according to the rivers direction, divides into a plurality of galleries with the reaction zone.

Furthermore, the lower part of muddy water disengagement zone be the back taper structure, the back taper structure from the top down internal diameter reduce gradually, the bottom of back taper structure be equipped with mud backflow seam.

Furthermore, the mud-water separation zone is connected with the sludge retention zone, and a gas stripping reflux device is arranged in the sludge retention zone.

Furthermore, the reaction zone is connected with a water inlet mixing zone, the water inlet mixing zone is communicated with the bottom of the reaction zone, and the water inlet mixing zone is connected with the sludge retention zone through a gas stripping reflux device.

Furthermore, the gas reflux device comprises a gas stripping reflux pipe and a gas supply pipe, the gas supply pipe is arranged in the gas stripping reflux pipe, one end of the gas stripping reflux pipe is connected with the sludge retention area, and the other end of the gas stripping reflux pipe is connected with the water inlet mixing area.

Further, the biogas mixing device also comprises a biogas air pump, and the biogas air pump is connected with the aeration stirring device and the air supply pipe.

Preferably, the biogas air pump is electrically connected with a PLC program.

Furthermore, the top of the reactor body is connected with a sealing cover, and the sealing cover is provided with a biogas pipeline.

Furthermore, the biogas air pump is connected with the aeration stirring device and the air supply pipe through a biogas pipeline.

Furthermore, a water outlet pipe is arranged above the inclined pipe packing or the inclined plate packing.

The utility model discloses an anaerobic reactor of marsh gas inner loop, the beneficial effect who compares with prior art lies in:

1. the arrangement of the tunnel plug flow and the air stripping reflux in the reactor ensures that the reactor has the flow state characteristics of plug flow and complete mixing, fully ensures effective retention time and greatly improves the shock load resistance of the reactor.

2. The water inlet mode is simplified, a high-power water inlet pump is not needed, corresponding energy consumption is saved, large-area methane internal circulation stirring is carried out at the bottom of the reactor, the hydraulic shearing form is improved, the hydraulic shearing is far higher than that of the traditional anaerobic reactor, the reactor still keeps relatively stable hydraulic shearing even under low water inlet load in slack season, and the formation and the form stability of granular sludge under various production conditions are facilitated.

3. The method adopts a whole-region methane collection and simple sedimentation mode, abandons a three-phase separator of the traditional anaerobic reactor which is easy to interfere with mud-water separation by produced gas, keeps higher gas production and full mud-water mixing, does not influence mud-water separation, and has stable mud-water separation effect.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without any creative effort.

FIG. 1 is a top view of an anaerobic reactor with internal circulation of biogas according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view taken along line 1-1 of FIG. 1;

fig. 3 is a cross-sectional view taken along the line 2-2 in fig. 1.

1-a reactor body; 2-a water inlet mixing zone; 3-a reaction zone; 4-a sludge retention zone; 5-a first flow port; 6-a second flow through port; 7-gas stripping reflux unit; 8-an aeration stirring device; 9-biogas air pump; 10-steady flow gas release area; 11-a mud-water separation zone; 12-inclined tube packing; 13-inclined baffles; 14-sludge backflow seam; 15-water outlet pipe; 16-a gas stripping return pipe; 17-a gas supply tube; 18-a sealing cover; 19-biogas space.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that 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 in the specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally placed when the products of the present invention are used, and are only used for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have specific orientations, be constructed and operated in specific orientations, and thus, should not be construed as limiting the present invention.

The terms "parallel", "perpendicular", etc. do not require that the components be absolutely parallel or perpendicular, but may be slightly inclined. For example, "parallel" merely means that the directions are more parallel relative to "perpendicular," and does not mean that the structures are necessarily perfectly parallel, but may be slightly tilted.

The terms "transverse", "longitudinal", "horizontal", "vertical", "overhanging", and the like do not imply a requirement that the components be absolutely horizontal, vertical or overhanging, but may be somewhat inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

Furthermore, the terms "substantially", and the like are intended to indicate that the relative terms are not necessarily strictly required, but may have some deviation. For example: "substantially equal" does not mean absolute equality, but it is difficult to achieve absolute equality in actual production and operation, and certain deviations generally exist. Thus, in addition to absolute equality, "substantially equal" also includes the above-described case where there is some deviation. In this case, unless otherwise specified, terms such as "substantially", and the like are used in a similar manner to those described above.

In the description of the present invention, it should also be noted that, unless otherwise explicitly stated or limited, the terms "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Examples

Referring to fig. 1-3, the anaerobic reactor with biogas internal circulation comprises a reactor body 1, wherein the reactor body 1 comprises a water inlet mixing zone 2, a reaction zone 3, a settling zone and a sludge retention zone 4 which are connected in sequence. The zones are separated in the reactor body 1 by a partition above the water level. A first clapboard is arranged between the water inlet mixing zone 2 and the reaction zone 3, and the bottom of the first clapboard is provided with a first flow port 5. The water inlet mixing zone 2 is communicated with the bottom of the reaction zone 3 through a first flow passing port 5. A second clapboard is arranged between the reaction zone 3 and the sedimentation zone, and the top of the second clapboard is provided with a second overflowing port 6. The reaction zone 3 is communicated with the top of the precipitation zone through a second flow through port 6. The sludge retention zone 4 is internally provided with a gas stripping reflux device 7. The water inlet mixing zone 2 is connected with the sludge retention zone 4 through a gas stripping reflux device 7.

Waste water to be treated firstly enters the water inlet mixing zone 2, the water inlet mixing zone 2 is arranged to enable newly-fed waste water and mixed liquid returned from the sludge retention zone 4 to be temporarily retained and uniformly mixed, so that pollutants carried by the newly-fed waste water are quickly mixed and diluted, and the mixed liquid in the water inlet mixing zone 2 flows to the reaction zone 3 through the first overflowing port 5. Be equipped with the division board in the reaction zone 3, the division board is a plurality of and sets up side by side according to the rivers direction, divide into a plurality of galleries with reaction zone 3. In this embodiment, N partition plates (N is not less than 1) are disposed in the reaction zone 3, the reaction zone 3 is divided into N +1 galleries, and the mixed liquid flows along the galleries. The bottom of the reaction zone 3 is provided with a plurality of aeration stirring devices 8, and the number of the aeration stirring devices 8 is multiple. The aeration stirring device 8 in this embodiment is a perforated aeration hose. The aeration stirring device 8 is connected with a methane air pump 9. Be different from traditional aeration equipment aeration air oxygenation stirring, the utility model discloses an utilize partly marsh gas that produces in the reactor as the medium source of aeration, stir through gas and provide extra water conservancy for the muddy water mixing of reaction zone 3 and cut, especially when the load is lower in the slack season, reactor self gas production is less to guarantee abundant muddy water mixing, through the mode of marsh gas inner loop stirring, keeps the required certain water conservancy shearing force of reactor throughout, is favorable to the cultivation of granule mud and the maintenance of form. In this embodiment, the biogas air pump 9 is electrically connected to the PLC program. The biogas air pump 9 can be set to be in adjustable frequency and continuously/intermittently switched operation through a PLC program, and corresponding adjustment is carried out according to the incoming water load condition.

The mixed liquid in the reaction zone 3 enters a precipitation zone through a second overflowing port 6 of a second clapboard, and the precipitation zone is sequentially provided with a steady flow gas releasing zone 10 and a mud-water separation zone 11 which are communicated with each other at the bottom according to the water flow sequence. The reaction zone 3 is communicated with the top of the steady flow gas releasing zone 10 through a second flow port 6. The second partition board is arranged at the tail end of the reaction area and is vertical to the water flow direction. The second overflow opening 6 is arranged at the top of the second partition plate and is positioned below the water surface. The steady flow gas release area 10 and the mud-water separation area 11 are separated by a vertical plate, and the bottom of the vertical plate is connected with an inclined plate. The steady flow gas release area 10 is a structure with a narrow upper part and a wide lower part, the sludge-water mixed liquid after complete reaction in the reaction area 3 still carries with methane, when the mixed liquid passes through the steady flow gas release area 10, the mixed liquid moves downwards under the action of gravity, the cross section of the water flow is increased, the flow rate is reduced, methane bubbles move upwards under the action of buoyancy, the methane is gradually released and separated from the sludge-water mixed liquid, thus the mixed liquid is ensured to be basically free of methane before entering the sludge-water separation area 11, the water flow is gentle after the flow rate is reduced, and the subsequent sludge-water separation is facilitated. The mud-water separation area 11 is internally provided with an inclined tube filler 12 or an inclined plate filler. In this embodiment, the slurry separation zone 11 is provided with an inclined tube filler 12. The lower part of mud water disengagement zone 11 is the back taper structure, the back taper structure from the top down internal diameter reduce gradually, the bottom of back taper structure be equipped with mud backflow seam 14. In this embodiment, the lower portion of the sludge-water separation zone 11 is formed into an inverted cone structure by 2 inclined partition plates 13 with different lengths and arranged crosswise, and a space is arranged between the 2 inclined partition plates 13 as a sludge return slit 14. The mud-water mixed liquor moves upwards in the mud-water separation zone 11, the sludge in the mixed liquor is blocked and naturally settled and slides down after meeting the inclined tube filler 12, and the supernatant continues to upwards pass through the inclined tube filler 12 and is collected to the water outlet pipe 15 above the inclined tube filler 12 to be discharged. The settled sludge continues to slide down to the sludge retention zone 4 naturally along the inclined partition plate 13 below the sludge-water separation zone 11 through the sludge return slit 14.

The sludge retention zone 4 is used for temporarily retaining the precipitated sludge. The sludge retention zone 4 is internally provided with a gas stripping reflux device 7. The sludge retention zone 4 is connected with the water inlet mixing zone 2 through a gas stripping reflux device 7. The gas reflux device 7 comprises a gas stripping reflux pipe 16 and a gas supply pipe 17, the gas supply pipe 17 is arranged in the gas stripping reflux pipe 16, and the gas supply pipe 17 is connected with the gas stripping air pump 9. One end of the gas stripping return pipe 16 is immersed into the bottom of the sludge retention zone 4, and the other end is above the water surface of the water inlet mixing zone 2. The working principle of the gas stripping reflux device 7 is that a gas stripping air pump 9 is connected with an air supply pipe 17 to inject biogas into a gas stripping reflux pipe 16, gas-water mixed liquid with the density smaller than that of water is formed in the gas stripping reflux pipe 16, and the mixed liquid in the sludge retention area 4 is lifted and refluxed to the water inlet mixing area 2 through the density difference to be mixed with newly-fed wastewater, so that the sludge full-mixing circulation of the whole reactor is realized. The top of the reactor body 1 is connected with a sealing cover 18, and the sealing cover 18 is provided with a biogas pipeline. The biogas air pump 9 is connected with the aeration stirring device 8 and the air supply pipe 17 through a biogas pipeline. The sealing cover 18 is used for completely sealing the reactor body 1, and a biogas space 19 is enclosed between the reactor body 1 and the sealing cover 18. The biogas space 19 is located above the water surface of the reactor body 1. Pollutants in the wastewater are utilized by microorganisms in the reaction zone 3 to generate biogas which naturally escapes upwards to the water surface, and the biogas is collected at the top of the reactor body 1 and is conveyed outwards through a biogas pipeline, most of the biogas is conveyed to users, a small part of the biogas is conveyed back into the reactor through the biogas pipeline by an external biogas air pump 9, and the gas is respectively supplied to each aeration stirring device 8 and the gas supply pipe 17 through branch pipes of the biogas pipeline in the reactor.

The utility model discloses an anaerobic reactor of marsh gas inner loop has following beneficial effect:

1. the arrangement of the tunnel plug flow and the gas stripping reflux in the reactor ensures that the reactor has the characteristics of plug flow and fully mixed flow state, fully ensures the effective retention time and greatly improves the shock load resistance of the reactor.

2. The water inlet mode is simplified, a high-power water inlet pump is not needed, corresponding energy consumption is saved, large-area methane internal circulation stirring is carried out at the bottom of the reactor, the hydraulic shearing form is improved, the hydraulic shearing is far higher than that of the traditional anaerobic reactor, the reactor still maintains relatively stable hydraulic shearing even under low water inlet load in slack season, and the formation and form stability of granular sludge under various production conditions are facilitated.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An anaerobic reactor with biogas internal circulation, which comprises a reactor body and is characterized in that the reactor body comprises a reaction zone and a precipitation zone which are connected in sequence,

the sedimentation zone comprises a steady flow gas release zone and a mud-water separation zone which are sequentially arranged, the reaction zone is communicated with the top of the steady flow gas release zone, and the steady flow gas release zone is communicated with the bottom of the mud-water separation zone; the steady flow gas release area is a structure with a narrow upper part and a wide lower part, and inclined tube packing or inclined plate packing is arranged in the mud-water separation area.

2. An anaerobic reactor with internal circulation of biogas according to claim 1, characterized in that the partition plates are provided in plurality, and are arranged side by side according to the water flow direction, dividing the reaction zone into a plurality of galleries.

3. An anaerobic reactor for internal circulation of biogas according to claim 2, characterized in that the lower part of the sludge-water separation zone is of an inverted cone structure, the inner diameter of the inverted cone structure is gradually reduced from top to bottom, and the bottom of the inverted cone structure is provided with a sludge return slit.

4. An anaerobic reactor with internal circulation of biogas as claimed in claim 3, characterized in that the sludge-water separation zone is connected with a sludge retention zone, and a gas stripping reflux device is arranged in the sludge retention zone.

5. An anaerobic reactor with internal circulation of biogas according to claim 4, characterized in that the reaction zone is connected with a water inlet mixing zone, the water inlet mixing zone is communicated with the bottom of the reaction zone, and the water inlet mixing zone is connected with the sludge retention zone through a gas stripping reflux device.

6. An anaerobic reactor with internal circulation of biogas as claimed in claim 5, characterized in that the stripping reflux device comprises a stripping reflux pipe and a gas supply pipe, the gas supply pipe is arranged in the stripping reflux pipe, one end of the stripping reflux pipe is connected with the sludge retention zone, and the other end is connected with the water inlet mixing zone.

7. An anaerobic reactor with internal circulation of biogas as claimed in claim 6, further comprising a biogas air pump connected to the aeration stirring device and the gas supply pipe.

8. An anaerobic reactor with internal circulation of biogas as claimed in claim 7, characterized in that the top of the reactor body is connected with a sealing cover, and the sealing cover is provided with a biogas pipeline.

9. An anaerobic reactor with internal circulation of biogas as claimed in claim 8, characterized in that the biogas air pump is connected with the aeration stirring device and the gas supply pipe through biogas pipes.

10. An anaerobic reactor with biogas internal circulation according to claim 9, characterized in that a water outlet pipe is arranged above the inclined pipe packing or the inclined plate packing.