ABR-precipitation-multistage AO artificial wetland integrated sewage treatment system

Abstract

The utility model discloses an ABR-precipitation-multistage AO artificial wetland integrated sewage treatment system, belongs to the field of sewage treatment, and solves the problem of high sewage treatment difficulty in rural areas. The system comprises multiple stages of ABR anaerobic reaction chambers, a sedimentation tank and multiple stages of AO artificial wetland units which are sequentially communicated, the adjacent AO artificial wetland units are communicated through a deoxidizing tank, the first stage of ABR anaerobic reaction chamber is connected with a water inlet pipe, the AO artificial wetland units are provided with anoxic artificial wetlands and aerobic artificial wetlands along the water flow direction, and the anoxic artificial wetlands and the aerobic artificial wetlands are communicated through a water inlet pipe. And the aerobic artificial wetland of the last stage of AO artificial wetland unit is connected with a water outlet pipe. According to the utility model, the ABR anaerobic reaction chamber, the sedimentation tank and the AO artificial wetland unit are integrally designed, so that various pollutants such as suspended matters, organic matters, ammonia nitrogen, total nitrogen and total phosphorus in inlet water can be effectively removed, and the sewage treatment device is suitable for domestic sewage treatment in rural areas, but is not limited to the rural areas.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of sewage treatment, specifically relates to a kind of ABR-sedimentation-multistage AO artificial wetland integrated sewage treatment system. BACKGROUND

[0002] The sewage generated in rural areas is mainly derived from daily life, including washing water, kitchen sewage and excrement sewage, etc., these domestic sewage has the characteristics of large water quality fluctuation, significant regional difference, unstable water quantity change and random discharge, and contains a large amount of nitrogen and phosphorus elements, if not treated directly into water, it will cause water eutrophication, and further cause water quality deterioration. In the current process of comprehensive management of water environment, in view of the regional and composite characteristics of water environment pollution, the complete suppression of pollution problem faces great challenges, especially in some key reservoirs and key slow-flow lakes, eutrophication problem is still prominent, which has direct harm to water ecological environment and human health.

[0003] In view of the problem that it is difficult to treat sewage in rural areas, the utility model innovatively develops a kind of ABR-sedimentation-multistage AO artificial wetland integrated sewage treatment system for treating rural domestic sewage. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of ABR-sedimentation-multistage AO artificial wetland integrated sewage treatment system to solve the problem that it is difficult to treat sewage in rural areas.

[0005] The technical scheme of the utility model is: a kind of ABR-sedimentation-multistage AO artificial wetland integrated sewage treatment system, including multistage ABR anaerobic reaction chamber, sedimentation tank and multistage AO artificial wetland unit communicated in sequence, adjacent AO artificial wetland unit is communicated by deaerator, first stage ABR anaerobic reaction chamber is connected with inlet pipe, and AO artificial wetland unit is arranged with anoxic artificial wetland and aerobic artificial wetland along water flow direction, and the aerobic artificial wetland of last stage AO artificial wetland unit is connected with outlet pipe.

[0006] As a further improvement of the utility model, the sedimentation tank adopts inclined tube sedimentation tank, the top of the sedimentation tank is provided with a cover plate, a water inlet partition is arranged in the sedimentation tank, one side of the water inlet partition is a water inlet compartment, the water inlet compartment is communicated with the last stage ABR anaerobic reaction chamber, one side of the water partition is a sedimentation compartment, the sedimentation compartment is communicated with the bottom of the water inlet compartment, and an inclined tube is arranged in the sedimentation compartment.

[0007] As a further improvement of the utility model, the bottom of the sedimentation compartment is provided with a sedimentation tank sludge discharge port.

[0008] As a further improvement of the present application, the anoxic constructed wetland is a downward flow wetland, and the aerobic constructed wetland is an upward flow wetland, and the bottoms of the anoxic constructed wetland and the aerobic constructed wetland are communicated.

[0009] The anoxic constructed wetland comprises, from top to bottom, a cobblestone surface layer, a biomass filler layer, a waste brick block particle layer and a cobblestone cushion layer, the biomass filler layer is formed by corn cob filling, and a mulch film is arranged on the top of the anoxic constructed wetland.

[0010] The cobblestone surface layer of the anoxic constructed wetland is provided with a plurality of perforated water distribution pipes, the perforated water distribution pipes are connected with water inlet grooves, the water inlet groove of the first-stage AO constructed wetland unit is communicated with the sedimentation compartment, and the water inlet grooves of the rest of the AO constructed wetland units are communicated with the deoxygenation tanks at the front ends thereof.

[0011] As a further improvement of the present application, the water inlet groove of the first-stage AO constructed wetland unit is connected with a water distribution pipe, a total valve is arranged on the water distribution pipe, a plurality of branch pipes are connected with the water distribution pipe, the branch pipes are connected with the water inlet grooves of the rest of the AO constructed wetland units in a one-to-one correspondence, and branch valves are arranged on the branch pipes.

[0012] As a further improvement of the present application, the waste brick block particle layer of the aerobic constructed wetland is provided with aeration holes, and the cobblestone cushion layers of the anoxic constructed wetland and the aerobic constructed wetland are provided with venting ports.

[0013] As a further improvement of the present application, a vertical drainage plate is arranged in the deoxygenation tank, and the lower end of the drainage plate is provided with an opening.

[0014] As a further improvement of the present application, a cover plate is arranged on the top of the ABR anaerobic reaction chamber, a baffle plate is arranged in the ABR anaerobic reaction chamber, the baffle plate divides the ABR anaerobic reaction chamber into a downward flow compartment and an upward flow compartment which are communicated at the bottom, the side walls of adjacent ABR anaerobic reaction chambers are communicated at the top, and the water inlet pipe is arranged at the top of the side wall of the first-stage ABR anaerobic reaction chamber; and the ABR anaerobic reaction chamber is provided with activated sludge at the bottom.

[0015] As a further improvement of the present application, the ABR anaerobic reaction chamber is provided with an anaerobic chamber sludge discharge port at the bottom.

[0016] As a further improvement of the present application, the AO constructed wetland units and the deoxygenation tanks are sequentially decreased in elevation from front to back.

[0017] The present application has the following beneficial effects:

[0018] 1. The utility model discloses an integrated sewage treatment system with ABR, sedimentation, multistage AO constructed wetland, anaerobic - sedimentation - anoxic - aerobic - anoxic - aerobic - anoxic - aerobic is alternately arranged, and the front ABR anaerobic reaction chamber reduces the concentration of COD, TN, TP and other pollutants in the influent, the sedimentation tank can further remove SS in the influent, avoids the blockage of the rear end AO constructed wetland unit, effectively reduces the processing load of the rear end AO constructed wetland unit, and the AO constructed wetland unit passes through the way of segmented influent, and each stage AO constructed wetland unit can maximize the utilization of influent carbon source, effectively guarantees the concentration of carbon source of each section, improves the denitrification efficiency, avoids the high operation cost brought by a large amount of reagent addition under the premise, and strengthens the phosphorus removal effect.

[0019] 2. The waste brick block particle layer is arranged in the AO constructed wetland unit, the surface area of the construction waste brick block is big, and the porosity can change along with the change of particle size, which effectively reduces the constructed wetland capital cost through waste recycling. The biomass filler layer formed by the crop waste corn cob filling is arranged in the AO constructed wetland unit, the corn cob can release carbon source under the condition that the influent carbon nitrogen ratio is low, the carbon nitrogen ratio of the constructed wetland is improved through waste recycling, and the denitrification denitrification efficiency is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the structure schematic diagram of the utility model;

[0021] Figure 2 It is the structure schematic diagram of the AO constructed wetland unit in the utility model.

[0022] In the drawing: 1 - ABR anaerobic reaction chamber;101 - baffle plate;102 - downward flow compartment;103 - upward flow compartment;105 - activated sludge;106 - anaerobic chamber sludge discharge port;2 - water distribution pipe;201 - total valve;202 - branch pipe;203 - branch valve;3 - influent pipe;4 - sedimentation tank;401 - influent partition;402 - inclined pipe;403 - sedimentation tank sludge discharge port;404 - sedimentation compartment;405 - influent compartment;5 - AO constructed wetland unit;51 - anoxic constructed wetland;52 - aerobic constructed wetland;501 - influent tank;502 - mulch;503 - pebble surface layer;504 - perforated water distribution pipe;505 - biomass filler layer;506 - waste brick block particle layer;507 - pebble cushion layer;508 - perforated water collecting pipe;509 - plant;510 - vent;511 - aeration hole;7 - deaeration tank;701 - drainage plate;8 - effluent pipe. DETAILED DESCRIPTION

[0023] The utility model will be described in detail below in combination with the drawings.

[0024] Example 1,

[0025] As Figure 1 , Figure 2 shown, an ABR-sedimentation-multistage AO integrated constructed wetland wastewater treatment system, comprising a plurality of ABR anaerobic reaction chambers 1, a sedimentation tank 4 and a plurality of AO constructed wetland units 5 connected in sequence, adjacent AO constructed wetland units 5 are connected through deoxygenation tanks 7, the first stage ABR anaerobic reaction chamber 1 is connected with a water inlet pipe 3, the AO constructed wetland unit 5 is provided with anoxic constructed wetland 51 and aerobic constructed wetland 52 along the water flow direction, and the aerobic constructed wetland 52 of the last stage AO constructed wetland unit 5 is connected with a water outlet pipe 8.

[0026] The sedimentation tank 4 adopts an inclined tube sedimentation tank, the top of the sedimentation tank 4 is provided with a cover plate, the sedimentation tank 4 is provided with a water inlet partition plate 401, one side of the water inlet partition plate 401 is a water inlet compartment 405, the water inlet compartment 405 is communicated with the last stage ABR anaerobic reaction chamber 1, one side of the water inlet partition plate 401 is a sedimentation compartment 404, the sedimentation compartment 404 is communicated with the bottom of the water inlet compartment 405, and the sedimentation compartment 404 is provided with an inclined tube 402.

[0027] The bottom of the sedimentation compartment 404 is provided with a sedimentation tank sludge discharge port 403, which is used for periodic sludge discharge and maintenance emptying.

[0028] The anoxic constructed wetland 51 is a downward flow wetland, and the aerobic constructed wetland 52 is an upward flow wetland, and the bottom of the anoxic constructed wetland 51 is communicated with the bottom of the aerobic constructed wetland 52;

[0029] The anoxic constructed wetland 51 is provided with a corn cob filling layer 505, a waste brick particle layer 506 and a cob cushion layer 507 from top to bottom, the corn cob filling layer 505 is composed of corn cob filling, and the top of the anoxic constructed wetland 51 is paved with agricultural mulch 502 to maintain the anoxic environment of the anoxic constructed wetland 51; the aerobic constructed wetland 52 is provided with a cob cushion layer 507, a waste brick particle layer 506 and a cob surface layer 503 from bottom to top, and the top of the aerobic constructed wetland 52 is planted with wetland plants 509, which can be selected from cattails, reeds or cannae;

[0030] A plurality of perforated water distribution pipes 504 are embedded side by side in the cob surface layer 503 of the anoxic constructed wetland 51, the perforated water distribution pipes 504 are connected with a water inlet tank 501, the water inlet tank 501 of the first stage AO constructed wetland unit 5 is communicated with the sedimentation compartment 404, and the water inlet tank 501 of the remaining AO constructed wetland units 5 is communicated with the deoxygenation tank 7 at the front end thereof; a plurality of perforated water collection pipes 508 are embedded side by side in the cob surface layer 503 of the aerobic constructed wetland 52, the perforated water collection pipes 508 are communicated with the deoxygenation tank 7 at the rear end of the aerobic constructed wetland 52, and the perforated water collection pipes 508 of the last stage aerobic constructed wetland 52 are connected with the water outlet pipe 8.

[0031] The water inlet tank 501 of the first-stage AO constructed wetland unit 5 is connected with a water distribution pipe 2, the water distribution pipe 2 is provided with a main valve 201, the water distribution pipe 2 is connected with a plurality of branch pipes 202, the branch pipes 202 are connected with the water inlet tanks 501 of the remaining AO constructed wetland units 5 one by one, and the branch pipes 202 are provided with branch valves 203.

[0032] The waste brick particle layer 506 of the aerobic constructed wetland 52 is provided with an aeration hole 511, and the gravel cushion layer 507 of the anoxic constructed wetland 51 and the aerobic constructed wetland 52 are provided with a vent 510, which is used for maintenance and venting of the AO constructed wetland unit 5.

[0033] The deoxidation tank 7 is provided with a vertical flow guide plate 701, and the lower end of the flow guide plate 701 is open.

[0034] The ABR anaerobic reaction chamber 1 is provided with a cover plate at the top, and the ABR anaerobic reaction chamber 1 is provided with a baffle plate 101, which divides the ABR anaerobic reaction chamber 1 into a downward flow compartment 102 and an upward flow compartment 103 in communication at the bottom, the top of the side walls of adjacent ABR anaerobic reaction chambers 1 are in communication, and the water inlet pipe 3 is located at the top of the side wall of the first-stage ABR anaerobic reaction chamber 1; and the ABR anaerobic reaction chamber 1 is provided with activated sludge 105 at the bottom.

[0035] The ABR anaerobic reaction chamber 1 is provided with an anaerobic chamber sludge discharge port 106 at the bottom, which is used for periodic sludge discharge and maintenance and venting.

[0036] The AO constructed wetland unit 5 and the deoxidation tank 7 are sequentially decreased in elevation from front to back. By setting the elevation difference, the sewage flows by gravity, avoiding the input of sewage lifting energy, and the layout is compact, saving land area and reducing construction cost.

[0037] In the embodiment, the ABR anaerobic reaction chamber 1 is provided with three stages, and the AO constructed wetland unit 5 is provided with three stages.

[0038] In the waste brick particle layer 506 of the first-stage AO constructed wetland unit 5, the particle size of the waste brick particles ranges from 0.5 cm to 1.0 cm; in the waste brick particle layer 506 of the second-stage AO constructed wetland unit 5, the particle size of the waste brick particles ranges from 0.2 cm to 0.5 cm; and in the waste brick particle layer 506 of the third-stage AO constructed wetland unit 5, the particle size of the waste brick particles ranges from 0.1 cm to 0.2 cm.

[0039] The raw sewage enters the first-stage ABR anaerobic reaction chamber 1 through the inlet pipe 3, passes through the upflow compartment 102 and the activated sludge 105, and then enters the next-stage ABR anaerobic reaction chamber 1 from the upflow compartment 103. After passing through the three-stage ABR anaerobic reaction chamber 1, the sewage enters the inlet compartment 405 of the sedimentation tank 4, passes through the inclined pipe 402 from bottom to top, and then enters the water inlet tank 501 of the first-stage AO constructed wetland unit 5. Part of the water in the water inlet tank 501 enters the first-stage AO constructed wetland unit 5, and the rest of the water enters the subsequent-stage AO constructed wetland units 5 through the water distribution pipe 2 and the branch pipe 202, and the flow distribution ratio of the first-stage, second-stage and third-stage AO constructed wetland units 5 is 0.5:0.35:0.15. In the AO constructed wetland unit 5, the water flow enters the cobblestone surface layer 503 of the anoxic constructed wetland 51 through the perforated water distribution pipe 504, and then passes through the biomass filler layer 505, waste brick particle layer 506 and cobblestone cushion layer 507 of the anoxic constructed wetland 51 from top to bottom in sequence, and then passes through the cobblestone cushion layer 507, waste brick particle layer 506 and cobblestone surface layer 503 of the aerobic constructed wetland 52 from bottom to top in sequence. The effluent of the first-stage and second-stage AO constructed wetland units 5 enters the water inlet tank 501 of the next-stage AO constructed wetland unit 5 through the perforated water collecting pipe 508 and the deoxidation tank 7, and the effluent of the third-stage AO constructed wetland unit 5 is discharged through the perforated water collecting pipe 508 and the outlet pipe 8.

[0040] The aerobic constructed wetland 52 is supplied with oxygen through the aeration holes 511 to ensure an aerobic environment, and the aeration holes 511 are connected to the aeration pump pipeline.

[0041] In the embodiment, the hydraulic retention time of the three-stage ABR anaerobic reaction chamber 1 is 16-20 h, and the hydraulic retention time of the three-stage AO constructed wetland unit 5 is 40-60 h. The COD concentration of the influent is 286.54-341.26 mg / L, the COD concentration of the effluent of the system is 9.14-14.63 mg / L, the removal rate is 95.71%-96.81%, and the effluent meets the first-stage A standard of the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002). The NH4 + -N concentration of the influent is 52.32-74.24 mg / L, the NH4 +The concentration of N is 0.96-4.06 mg / L, the removal rate is 94.53%-98.16%, and the effluent meets the first level A standard of the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB18918-2002). The concentration of TN in the influent is 58.52-77.25 mg / L, the concentration of TN in the effluent is 14.63-19.65 mg / L, the removal rate is 74.56%-75.0%, and the effluent meets the first level B standard of the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB18918-2002). The concentration of TP in the influent is 4.31-7.86 mg / L, the concentration of TP in the effluent is 0.92-2.36 mg / L, the removal rate is 69.97%-78.65%, and the effluent meets the first level standard of the Rural Domestic Sewage Treatment Facilities Water Pollutant Discharge Standard (DB62 / T 4014-2019) of Gansu Province in the northwest region.

[0042] The utility model discloses an integrated design form of ABR anaerobic reaction chamber, sedimentation tank and AO artificial wetland unit, which can effectively remove various pollutants such as suspended solids, organic matter, ammonia nitrogen, total nitrogen and total phosphorus in the influent, is suitable for rural domestic sewage treatment, but is not limited to rural areas. The utility model has a series of advantages such as simple process structure, small investment, low energy consumption, low operation cost, convenient operation and management, good treatment efficiency, strong impact load resistance during operation, excellent hydraulic conditions, remarkable denitrification effect, low carbon source cost, good denitrification effect, and can ensure that the effluent meets the first level A standard in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB18918-2002). The utility model solves the problems of large investment, high operation cost, poor water quality and quantity adaptability, low treatment efficiency, complex maintenance and the like of the existing integrated sewage treatment facilities.

Claims

1. An integrated wastewater treatment system comprising ABR-sedimentation-multi-stage AO constructed wetland, characterized in that: It includes a multi-stage ABR anaerobic reactor (1), a sedimentation tank (4), and a multi-stage AO constructed wetland unit (5) connected in sequence. Adjacent AO constructed wetland units (5) are connected by a deaeration tank (7). The first-stage ABR anaerobic reactor (1) is connected to an inlet pipe (3). The AO constructed wetland unit (5) is arranged with anoxic constructed wetland (51) and aerobic constructed wetland (52) along the water flow direction. The aerobic constructed wetland (52) of the last-stage AO constructed wetland unit (5) is connected to an outlet pipe (8).

2. The integrated wastewater treatment system of ABR-sedimentation-multi-stage AO constructed wetland according to claim 1, characterized in that: The sedimentation tank (4) is an inclined tube sedimentation tank. The top of the sedimentation tank (4) is covered with a cover plate. The sedimentation tank (4) is equipped with an inlet baffle (401). One side of the inlet baffle (401) is an inlet compartment (405), which is connected to the last stage ABR anaerobic reaction chamber (1). One side of the baffle (401) is a sedimentation compartment (404), which is connected to the bottom of the inlet compartment (405). The sedimentation compartment (404) is equipped with an inclined tube (402).

3. The integrated wastewater treatment system of ABR-sedimentation-multi-stage AO constructed wetland according to claim 2, characterized in that: The bottom of the sedimentation compartment (404) is equipped with a sedimentation tank sludge discharge port (403).

4. The integrated wastewater treatment system of ABR-sedimentation-multi-stage AO constructed wetland according to claim 3, characterized in that: The hypoxic constructed wetland (51) is a downflow wetland, and the aerobic constructed wetland (52) is an upflow wetland. The bottoms of the hypoxic constructed wetland (51) and the aerobic constructed wetland (52) are connected. The hypoxic constructed wetland (51) consists of a pebble surface layer (503), a biomass filler layer (505), a waste brick granule layer (506), and a pebble cushion layer (507) from top to bottom. The biomass filler layer (505) is made of corn cobs. The top of the hypoxic constructed wetland (51) is covered with a mulch film (502). The aerobic constructed wetland (52) consists of a pebble cushion layer (507), a waste brick granule layer (506), and a pebble surface layer (503) from bottom to top. The top of the aerobic constructed wetland (52) is planted with plants (509). Multiple perforated water distribution pipes (504) are buried in the pebble surface layer (503) of the anoxic constructed wetland (51). The perforated water distribution pipes (504) are connected to the inlet trough (501). The inlet trough (501) of the first-stage AO constructed wetland unit (5) is connected to the sedimentation chamber (404). The inlet troughs (501) of the other AO constructed wetland units (5) are connected to the deaeration tank (7) at its front end. Multiple perforated water collection pipes (508) are buried in the pebble surface layer (503) of the aerobic constructed wetland (52). The perforated water collection pipes (508) are connected to the deaeration tank (7) at the rear end of the aerobic constructed wetland (52). The perforated water collection pipes (508) of the last-stage aerobic constructed wetland (52) are connected to the outlet pipe (8).

5. The integrated wastewater treatment system of ABR-sedimentation-multi-stage AO constructed wetland according to claim 4, characterized in that: The inlet tank (501) of the first-level AO constructed wetland unit (5) is connected to a branch pipe (2). A main valve (201) is provided on the branch pipe (2). Multiple branch pipes (202) are connected to the branch pipe (2). The branch pipes (202) are connected to the inlet tanks (501) of the other AO constructed wetland units (5) in a corresponding manner. A branch valve (203) is provided on the branch pipe (202).

6. The integrated wastewater treatment system of ABR-sedimentation-multi-stage AO constructed wetland according to claim 5, characterized in that: The waste brick granule layer (506) of the aerobic constructed wetland (52) is provided with aeration holes (511); the cobblestone cushion layer (507) of both the anoxic constructed wetland (51) and the aerobic constructed wetland (52) is provided with venting outlets (510).

7. The integrated wastewater treatment system of ABR-sedimentation-multi-stage AO constructed wetland according to claim 6, characterized in that: The deaerator (7) is equipped with a vertical flow guide plate (701) with an opening at the bottom.

8. The integrated wastewater treatment system of ABR-sedimentation-multi-stage AO constructed wetland according to any one of claims 1-7, characterized in that: The ABR anaerobic reaction chamber (1) is equipped with a cover plate on the top and a baffle plate (101) is provided inside the ABR anaerobic reaction chamber (1). The baffle plate (101) divides the ABR anaerobic reaction chamber (1) into a bottom-connected downward flow compartment (102) and an upward flow compartment (103). The tops of the side walls of adjacent ABR anaerobic reaction chambers (1) are connected. The inlet pipe (3) is located at the top of the side wall of the first-stage ABR anaerobic reaction chamber (1). Activated sludge (105) is provided at the bottom of the ABR anaerobic reaction chamber (1).

9. The integrated wastewater treatment system of ABR-sedimentation-multi-stage AO constructed wetland according to claim 8, characterized in that: The bottom of the ABR anaerobic reaction chamber (1) is provided with an anaerobic chamber sludge discharge port (106).

10. The integrated wastewater treatment system of ABR-sedimentation-multi-stage AO constructed wetland according to claim 9, characterized in that: The elevation of the AO constructed wetland unit (5) and the deaeration tank (7) decreases sequentially from front to back.

Images