Internal circulation moving bed sulfur autotrophic denitrification nitrogen removal device

Abstract

The utility model relates to the technical field of sewage treatment, and particularly discloses an internal circulation moving bed sulfur autotrophic denitrification nitrogen removal device which comprises a reactor shell, biological sulfur powder and suspended filler are filled in the reactor shell, a guide cylinder is arranged in the reactor shell, the guide cylinder is used for guiding waste water, and the reactor shell is provided with a water inlet and a water outlet. An obliquely arranged intercepting screen mesh is fixed on one side of the reactor shell, a vertical-flow type sedimentation tank is arranged on one side of the reactor shell, the intercepting screen mesh is communicated with the vertical-flow type sedimentation tank, a central pipe is fixed in the middle of the vertical-flow type sedimentation tank, an umbrella-shaped reflecting plate is connected below the central pipe, and the vertical-flow type sedimentation tank is communicated with the central pipe. A reflux pump is arranged at one end of the vertical-flow sedimentation tank and is used for pumping part of effluent back into the reactor shell so as to improve the hydraulic stirring strength; according to the utility model, the wastewater treatment efficiency and the purification effect can be improved, and the treatment cost is greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewage treatment technical field, concretely relates to a kind of inner circulating moving bed sulfur autotrophic denitrification device. BACKGROUND

[0002] Sulfur autotrophic denitrification process is mostly fixed bed type denitrification biological filter, and its core is sulfur filler. This process discards the dependence on external organic carbon source, effectively reduces organic matter residue, and its operating cost is lower, and sludge quantity is less, and it is suitable for treating low C / N wastewater. Under anaerobic / anoxic condition, sulfur autotrophic denitrification process is driven by denitrifying desulfurization bacteria, which uses inorganic carbon source (such as CO3 2- , HCO 3- , CO2) as energy source, and uses reduced sulfur (such as S 0 , pyrite, Na2S, Na2S2O3, H2S, etc.) as electron donor, to reduce nitrate (NO 3- ) or nitrite (NO 2- ) electron acceptor to nitrogen (N2), and the conversion of reduced sulfur to sulfate, to realize the effective removal of nitrogen and the oxidation cycle of sulfur.

[0003] Most of the sulfur fillers on the market have large particle size (3mm-10mm), small specific surface area, small contact area with denitrifying bacteria, and need long biological solid residence time and low surface load, which leads to slow reaction speed and low efficiency. Although powder sulfur filler has large specific surface area and large contact area with microorganisms, it has high treatment efficiency and low manufacturing cost, but powder sulfur and denitrifying bacteria are easily lost with effluent, which leads to low utilization rate and limits its application.

[0004] Therefore, the skilled in the art provides an inner circulating moving bed sulfur autotrophic denitrification device to solve the problems in the background. CONTENT OF UTILITY MODEL

[0005] The utility model aims at providing an inner circulating moving bed sulfur autotrophic denitrification device, to solve the following technical problems:

[0006] How to solve the problem that powder sulfur and denitrifying bacteria are easily lost with effluent, to reduce treatment cost, improve wastewater treatment efficiency and purification effect.

[0007] The purpose of the utility model can be achieved by the following technical solutions:

[0008] The utility model provides a kind of internal circulation moving bed sulfur autotrophic denitrification device, including reactor shell, which is filled with biological sulfur powder and suspended filler, a draft tube is arranged in the reactor shell, which is used to guide the flow of wastewater, an intercepting screen is fixed on one side of the reactor shell, and a vertical-flow sedimentation tank is arranged on one side of the reactor shell, and the intercepting screen is communicated with the vertical-flow sedimentation tank.

[0009] A central tube is fixed in the middle of the vertical-flow sedimentation tank, an umbrella-shaped reflector plate is connected below the central tube, which is used to distribute wastewater evenly in the tank, a reflux pump is arranged at one end of the vertical-flow sedimentation tank, which is used to pump part of the effluent back into the reactor shell to increase the hydraulic stirring intensity.

[0010] Further, the reactor shell is polygonally arranged, and the vertical-flow sedimentation tank is arranged in a tapered cylinder shape with a wide upper part and a narrow lower part.

[0011] Further, a flow guide pipe is communicated with one side of the reactor shell, and the output end of the flow guide pipe is connected in the central tube.

[0012] Further, a circulating pump is arranged on one side of the vertical-flow sedimentation tank, a circulating effluent pipe is communicated between the lower part of the vertical-flow sedimentation tank and the input end of the circulating pump, and a circulating inlet pipe is communicated between the output end of the circulating pump and the side of the reactor shell away from the intercepting screen.

[0013] Further, a water outlet tank is arranged on one side of the vertical-flow sedimentation tank, a water outlet pump is arranged between the water outlet tank and the vertical-flow sedimentation tank, the input end of the water outlet pump is communicated with one side above the vertical-flow sedimentation tank, and the output end of the water outlet pump is communicated with the water outlet tank.

[0014] Further, the input end of the reflux pump is communicated with the water outlet tank, a water distributor is arranged in the reactor shell, which is used to introduce wastewater into the draft tube, and the output end of the reflux pump is communicated with the water distributor.

[0015] Further, a raw material tank and a water inlet tank are arranged at one end of the reactor shell, a stirrer is rotatably connected in each of the raw material tank, the water inlet tank and the water outlet tank, and a liquid level controller is connected to the raw material tank and the water inlet tank.

[0016] Further, a water inlet pump is arranged between the water inlet tank and the raw material tank, the input end of the water inlet pump is connected with the water inlet tank, the output end of the water inlet pump is connected with a heat exchanger, and the output end of the heat exchanger is communicated with the reactor shell.

[0017] Further, a feeding pump is arranged between the raw material tank and the reactor shell, the input end of the feeding pump is communicated with the raw material tank, and the output end of the feeding pump is communicated with the reactor shell.

[0018] The utility model discloses the beneficial effect of:

[0019] The utility model discloses set up the flow guide tube, reaction area, intercept silk screen, vertical flow type sedimentation tank, central tube, umbrella -shaped reflector board, and adopt the internal circulation formula sulfur autotrophic denitrification moving bed biofilm reactor, and the suspended filler density in moving bed biofilm reactor is close to water, and under the hydraulic agitation, can fully mix with sewage to react completely, and the specific surface area of suspended filler is big, and the loss of denitrifying bacteria can be avoided when microorganism is fixed and grows in the filler, and then improve the biomass of system, promote purification effect, and the flow baffle that reaction area sets can prevent the accumulation of suspended filler at the bottom of reaction area, guarantee suspended filler's internal circulation use simultaneously, and in the wastewater treatment process, can directly use biological sulfur powder, need not to make into sulfur granule, can greatly reduce the processing cost. BRIEF DESCRIPTION OF DRAWINGS

[0020] The utility model will be further described below in combination with the drawings.

[0021] Fig. 1 It is the process flow diagram of the utility model;

[0022] Fig. 2 It is the connecting structure schematic diagram of vertical flow type sedimentation tank of the utility model.

[0023] Reference signs:

[0024] 1, reactor shell;2, agitator;3, liquid level controller;4, water inlet pump;5, flow meter;6, heat exchanger;7, temperature controller;8, raw material tank;9, water inlet tank;10, feed pump;11, flow guide tube;12, circulating water inlet pipe;13, intercept silk screen;14, vertical flow type sedimentation tank;15, central tube;16, umbrella -shaped reflector board;17, circulating pump;18, water outlet pump;19, water outlet tank;20, water distributor;21, backflow pump;22, circulating water outlet pipe;23, flow guide pipe. DETAILED DESCRIPTION

[0025] The technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the range of protection of the utility model.

[0026] Embodiment one

[0027] Please refer to the attached Figs. 1-2This invention discloses an internal circulation moving bed sulfur autotrophic denitrification and nitrogen removal device, comprising a reactor shell 1 filled with biological sulfur powder and suspended packing material. Denitrifying bacteria are fixedly grown on the suspended packing material, which is made of polyethylene, polypropylene and its modified materials, polyurethane foam, etc., with a specific gravity close to that of water, mainly cylindrical and spherical, easy to attach biofilm, non-clumping, non-clogging, and easy to detach. A flow guide tube 11 is provided inside the reactor shell 1 to guide the wastewater. An inclined intercepting wire mesh 13 is fixed on one side of the reactor shell 1 to prevent the suspended packing material from being lost, while having a large flow area and a larger flow rate than a flat surface. A vertical flow sedimentation tank 14 is provided on one side of the reactor shell 1, and the intercepting wire mesh 13 is connected to the vertical flow sedimentation tank 14.

[0028] A central pipe 15 is fixed in the middle of the vertical flow sedimentation tank 14. Wastewater enters the tank from top to bottom through the central pipe 15. An umbrella-shaped reflector 16 is connected below the central pipe 15. The umbrella-shaped reflector 16 is used to make the wastewater evenly distributed in the tank. A return pump 21 is installed at one end of the vertical flow sedimentation tank 14. The return pump 21 is used to pump part of the effluent back into the reactor shell 1 to improve the hydraulic stirring intensity. At the same time, it replaces the aeration of the traditional MBBR process to make the suspended packing flow and maintain the anaerobic environment.

[0029] The reactor shell 1 is polygonal in shape, and the lower part of the vertical flow sedimentation tank 14 is a variable diameter cylindrical shape that is wider at the top and narrower at the bottom, which is used to promote the precipitation of bio-sulfur powder.

[0030] A guide pipe 23 is connected to one side of the reactor shell 1. The output end of the guide pipe 23 is connected to the central pipe 15. Under high-speed hydraulic stirring, the bio-sulfur powder overflows through the intercepting wire mesh 13 and the guide pipe 23 to the central pipe 15 of the vertical flow sedimentation tank 14 and enters the tank from top to bottom. It then settles to the bottom of the vertical flow sedimentation tank 14 by natural sedimentation.

[0031] Example 2

[0032] Based on Example 1, please refer to the appendix. Figs. 1-2 A circulation pump 17 is installed on one side of the vertical flow sedimentation tank 14. The input end of the circulation pump 17 is connected to the bottom of the vertical flow sedimentation tank 14 via a circulation outlet pipe 22. The output end of the circulation pump 17 is connected to the side of the reactor shell 1 away from the intercepting wire mesh 13 via a circulation inlet pipe 12. The circulation pump 17 draws in the bio-sulfur powder settled at the bottom of the vertical flow sedimentation tank 14 through the circulation inlet pipe 12 and re-enters the reactor shell 1 for a second mixing reaction to ensure the thoroughness of the reaction.

[0033] The vertical flow sedimentation tank 14 is further provided with a water outlet tank 19, and a water outlet pump 18 is arranged between the vertical flow sedimentation tank 14 and the water outlet tank 19. The input end of the water outlet pump 18 is in communication with one side above the vertical flow sedimentation tank 14, and the output end of the water outlet pump 18 is in communication with the water outlet tank 19. The treated wastewater can be pumped into the water outlet tank 19 by the water outlet pump 18.

[0034] The input end of the backflow pump 21 is in communication with the water outlet tank 19, and a water distributor 20 is arranged in the reactor shell 1. The water distributor 20 is used to guide the wastewater into the draft tube 11. The output end of the backflow pump 21 is in communication with the water distributor 20. Part of the water outlet is re-entered into the water distributor 20 through the backflow pump 21 and discharged into the reactor shell 1, so as to improve the strength of the hydraulic stirring.

[0035] One end of the reactor shell 1 is provided with a raw material tank 8 and a water inlet tank 9. Stirrers 2 are rotatably connected in the raw material tank 8, the water inlet tank 9 and the water outlet tank 19. The raw material tank 8 and the water inlet tank 9 are connected with liquid level controllers 3. The raw material tank 8 contains biological sulfur powder slurry dissolved in water, and the liquid level is monitored by the liquid level controller 3 in real time, so as to facilitate the subsequent addition of raw materials. The water inlet tank 9 contains wastewater containing nitrate (NO 3- ) and the liquid level is monitored by the liquid level controller 3 in real time.

[0036] The water inlet tank 9 is provided with a water inlet pump 4. The input end of the water inlet pump 4 is connected with the water inlet tank 9. The output end of the water inlet pump 4 is connected with a heat exchanger 6. The output end of the heat exchanger 6 is in communication with the reactor shell 1. The wastewater containing nitrate (NO 3- ) in the water inlet tank 9 enters the heat exchanger 6 under the action of the water inlet pump 4. After the temperature of the water inlet is changed to a suitable temperature for the work of denitrifying bacteria through the heat exchanger 6, the wastewater enters the reactor shell 1.

[0037] The raw material tank 8 is provided with a feed pump 10. The input end of the feed pump 10 is in communication with the raw material tank 8. The output end of the feed pump 10 is in communication with the reactor shell 1. The biological sulfur powder slurry in the raw material tank 8 enters the reactor shell 1 under the action of the feed pump 10.

[0038] The output end of the heat exchanger 6 is connected with a temperature controller 7. The temperature controller 7 can monitor the temperature of the wastewater in real time, so as to ensure that the temperature during the reaction is within a suitable range. The output end of the feed pump 10, the output end of the water inlet pump 4 and the output end of the circulating pump 17 are all connected with flow meters 5, and necessary valves are arranged between the pipelines. The specific arrangement position is the prior art.

[0039] Working principle: when in use, the wastewater is connected to the draft tube 11 through the water distributor 20, so that the wastewater is in an internal circulation state in the reactor shell 1 from bottom to top. The biological sulfur powder and the suspended filler are uniformly distributed in the reactor shell 1, and the denitrifying bacteria and the biological sulfur powder promote the rapid conversion of nitrate (NO 3- ) and nitrite (NO 2- ) in the sewage into nitrogen (N2) through sulfur autotrophic denitrification. The right part of the reactor shell 1 is provided with an intercepting screen 13 to intercept the suspended filler and part of the biological sulfur powder into the reactor shell 1. The bottom of the reactor shell 1 is provided with an inclined angle to prevent the formation of a dead zone and reduce the operation efficiency of the reaction. The treated wastewater and part of the biological sulfur powder are overflowed to the center pipe 15 of the vertical flow sedimentation tank 14 through high-speed stirring, enter the tank from top to bottom, and are naturally settled to the bottom of the vertical flow sedimentation tank 14. The settled biological sulfur powder is circulated to the reactor shell 1 through the circulating pump 17. The treated wastewater is pumped to the water outlet tank 19 by the water outlet pump 18, and part of the water can be pumped back to the reactor shell 1 by the backflow pump 21 to improve the strength of the hydraulic stirring, and at the same time, the suspended filler flows to maintain the anaerobic environment instead of the traditional MBBR process aeration.

[0040] The above describes one embodiment of the present application in detail, but the content described can only be the preferred embodiment of the present application, and cannot be considered to limit the implementation range of the present application. Any equivalent changes and improvements made within the scope of the present application should still belong to the patent coverage range of the present application.

Claims

1. An internal circulation moving bed sulfur autotrophic denitrification device, comprising a reactor shell (1), characterized in that, The reactor shell (1) is filled with biological sulfur powder and suspended filler, a draft tube (11) is arranged in the reactor shell (1), the draft tube (11) is used for guiding the flow of wastewater, an intercepting wire mesh (13) is fixed on one side of the reactor shell (1) and is arranged obliquely, a vertical flow type sedimentation tank (14) is arranged on one side of the reactor shell (1), and the intercepting wire mesh (13) is communicated with the vertical flow type sedimentation tank (14); A center pipe (15) is fixed in the middle of the vertical flow type sedimentation tank (14), an umbrella-shaped reflecting plate (16) is connected below the center pipe (15), the umbrella-shaped reflecting plate (16) is used for uniformly distributing wastewater in the tank, a reflux pump (21) is arranged at one end of the vertical flow type sedimentation tank (14), and the reflux pump (21) is used for pumping part of effluent back into the reactor shell (1) to improve the hydraulic stirring intensity.

2. The apparatus according to claim 1, wherein the apparatus is characterized in that: The reactor shell (1) is polygonally arranged, and the vertical flow type sedimentation tank (14) is arranged in a stepped cylinder shape with the upper part being wide and the lower part being narrow.

3. The apparatus according to claim 1, wherein the apparatus is characterized in that: A flow guide pipe (23) is communicated with one side of the reactor shell (1), and the output end of the flow guide pipe (23) is connected in the center pipe (15).

4. The apparatus according to claim 1, wherein the apparatus is characterized in that: A circulating pump (17) is arranged on one side of the vertical flow type sedimentation tank (14), a circulating effluent pipe (22) is communicated with the lower part of the vertical flow type sedimentation tank (14) at the input end of the circulating pump (17), a circulating water inlet pipe (12) is communicated with one side of the reactor shell (1) away from the intercepting wire mesh (13) at the output end of the circulating pump (17).

5. The apparatus for sulfur autotrophic denitrification according to claim 4, wherein: An effluent tank (19) is further arranged on one side of the vertical flow type sedimentation tank (14), an effluent pump (18) is arranged between the effluent tank (19) and the vertical flow type sedimentation tank (14), the input end of the effluent pump (18) is communicated with one side above the vertical flow type sedimentation tank (14), and the output end of the effluent pump (18) is communicated with the effluent tank (19).

6. The apparatus according to claim 5, wherein the apparatus is characterized in that: The input end of the reflux pump (21) is communicated with the effluent tank (19), a water distributor (20) is arranged in the reactor shell (1), the water distributor (20) is used for connecting the wastewater into the draft tube (11), and the output end of the reflux pump (21) is communicated with the water distributor (20).

7. The apparatus according to claim 5, wherein the apparatus is characterized in that: A raw material tank (8) and a water inlet tank (9) are arranged at one end of the reactor shell (1), agitators (2) are rotatably connected in the raw material tank (8), the water inlet tank (9) and the effluent tank (19), and the raw material tank (8) and the water inlet tank (9) are connected with liquid level controllers (3).

8. The apparatus according to claim 7, wherein the apparatus is characterized in that: A water inlet pump (4) is arranged between the water inlet tank (9) and the raw material tank (8), the input end of the water inlet pump (4) is connected with the water inlet tank (9), the output end of the water inlet pump (4) is connected with a heat exchanger (6), and the output end of the heat exchanger (6) is communicated with the reactor shell (1).

9. The internal circulating moving bed sulfur autotrophic denitrification device according to claim 8, characterized in that: A feeding pump (10) is arranged between the raw material tank (8) and the reactor shell (1), the input end of the feeding pump (10) is communicated with the raw material tank (8), and the output end of the feeding pump (10) is communicated with the reactor shell (1).

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