A sulfur autotrophic device for denitrification and desulfurization of leather wastewater

Abstract

This utility model belongs to the field of leather wastewater treatment technology, and particularly relates to a sulfur autotrophic device for denitrification and desulfurization of leather wastewater. It includes: an anaerobic reactor filled with anaerobic granular sludge and producing biogas; a biogas pipe connected at one end to the anaerobic reactor and located above the anaerobic granular sludge; a sulfur autotrophic denitrifier filled with a carrier, with the other end of the biogas pipe connected to the sulfur autotrophic denitrifier and located below the carrier; an internal circulation component connected at both ends to the sulfur autotrophic denitrifier, used to drive the biogas to circulate within the sulfur autotrophic denitrifier; and an external circulation component connected at one end to the sulfur autotrophic denitrifier and located above the carrier, with the other end connected to the anaerobic reactor and located within the anaerobic granular sludge, used to drive the biogas in the sulfur autotrophic denitrifier back into the anaerobic reactor. This utility model can reduce the amount of denitrifying sulfur bacteria used, saving operating costs.

Description

Technical Field

[0001] This utility model belongs to the field of leather wastewater treatment technology, and in particular relates to a sulfur autotrophic device for denitrification and desulfurization of leather wastewater. Background Technology

[0002] The increasing demands for environmental protection have led to higher requirements for total nitrogen in wastewater. However, the current denitrification technology for wastewater treatment in the leather industry still relies on the traditional AO process. The traditional AO denitrification process has the following disadvantages: large reaction structure volume, hydraulic retention time is generally 24-48 hours, resulting in high investment in civil engineering equipment; large sludge production, resulting in high sludge disposal costs; large aeration volume, high total nitrogen in leather wastewater, failing to achieve the goal of removing total nitrogen, requiring the addition of large amounts of carbon sources such as glucose and sodium acetate to the denitrification A tank, resulting in high daily operating costs.

[0003] Therefore, it is necessary to design a sulfur autotrophic device for denitrification and desulfurization of leather wastewater to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a sulfur autotrophic device for denitrification and desulfurization of leather wastewater, so as to solve the above-mentioned problems and achieve the goal of reducing the amount of denitrifying sulfur bacteria used and saving operating costs.

[0005] To achieve the above objectives, this utility model provides the following solution: a sulfur autotrophic device for denitrification and desulfurization of leather wastewater, comprising:

[0006] An anaerobic reactor, filled with anaerobic granular sludge and producing biogas;

[0007] A biogas pipe, one end of which is connected to the anaerobic reactor and located above the anaerobic granular sludge;

[0008] A sulfur autotrophic denitrifier is filled with a carrier inside, and the other end of the biogas pipe is connected to the sulfur autotrophic denitrifier and located below the carrier;

[0009] The internal circulation component is connected to the sulfur autotrophic denitrifier at both ends, and the internal circulation component is used to drive the biogas to circulate within the sulfur autotrophic denitrifier;

[0010] An external circulation component is connected at one end to the sulfur autotrophic denitrifier and located above the carrier, and at the other end to the anaerobic reactor and located inside the anaerobic granular sludge. The external circulation component is used to drive the biogas in the sulfur autotrophic denitrifier to flow back into the anaerobic reactor.

[0011] According to this utility model, a sulfur autotrophic device for denitrification and desulfurization of leather wastewater includes an internal circulation component comprising an air inlet circulation pipe. One end of the air inlet circulation pipe is connected to the sulfur autotrophic denitrifier and is located below the carrier. The other end of the air inlet circulation pipe is fixedly connected to the inlet end of a circulation pump. The outlet end of the circulation pump is fixedly connected to one end of an air outlet circulation pipe. The other end of the air outlet circulation pipe is connected to the sulfur autotrophic denitrifier and is located above the carrier.

[0012] According to this utility model, a sulfur autotrophic device for denitrification and desulfurization of leather wastewater is provided, wherein the outlet circulation pipe is located inside the sulfur autotrophic denitrifier and is fixedly connected to a number of equally spaced circulation gas nozzles.

[0013] According to this utility model, a sulfur autotrophic device for denitrification and desulfurization of leather wastewater is provided. The external circulation component includes a three-way valve. The first end of the three-way valve is connected to the sulfur autotrophic denitrifier and is located above the carrier. The second end of the three-way valve is fixedly connected to the air inlet of a blower. The air outlet of the blower is fixedly connected to one end of a biogas return pipe. The other end of the biogas return pipe is connected to the anaerobic reactor and is located inside the anaerobic granular sludge.

[0014] According to this utility model, a sulfur autotrophic device for denitrification and desulfurization of leather wastewater is provided, wherein the biogas return pipe is located inside the anaerobic granular sludge and is fixedly connected to a number of equally spaced return nozzles.

[0015] According to this utility model, a sulfur autotrophic device for denitrification and desulfurization of leather wastewater is provided, wherein the third end of the three-way valve is fixedly connected to one end of a connecting gas pipe, and the other end of the connecting gas pipe is fixedly connected to a biogas boiler.

[0016] According to this utility model, a sulfur autotrophic device for denitrification and desulfurization of leather wastewater is provided, wherein a number of three-phase separators are fixedly connected to one end of the biogas pipe that is connected to the anaerobic reactor, and a number of biogas nozzles are fixedly connected to one end of the biogas pipe that is connected to the sulfur autotrophic denitrifier.

[0017] This invention relates to a sulfur autotrophic device for denitrification and desulfurization of leather wastewater, wherein the anaerobic reactor is a UASB reactor.

[0018] Compared with the prior art, the present invention has the following advantages and technical effects:

[0019] 1. Remove total nitrogen from leather wastewater without adding a carbon source and ensure that it consistently meets emission standards;

[0020] 2. Utilize hydrogen sulfide from the biogas produced by the upstream anaerobic reactor to supplement part of the sulfur source required by the sulfur autotrophic denitrification unit;

[0021] 3. Reduce the consumption of denitrification and sulfurization self-growth packing. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of this utility model.

[0024] The components include: 1. Anaerobic reactor; 2. Anaerobic granular sludge; 3. Three-phase separator; 4. Biogas pipe; 5. Biogas nozzle; 6. Sulfur autotrophic denitrifier; 7. Carrier; 8. Inlet circulation pipe; 9. Circulation pump; 10. Outlet circulation pipe; 11. Circulating gas nozzle; 12. T-junction; 13. Biogas return pipe; 14. Blower; 15. Return gas nozzle; 16. Connecting gas pipe. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Reference Figure 1 As shown, this utility model provides a sulfur autotrophic device for denitrification and desulfurization of leather wastewater, comprising:

[0028] Anaerobic reactor 1 is filled with anaerobic granular sludge 2 and produces biogas.

[0029] Biogas pipe 4 is connected at one end to anaerobic reactor 1 and is located above anaerobic granular sludge 2.

[0030] The sulfur autotrophic denitrifier 6 is filled with a carrier 7, and the other end of the biogas pipe 4 is connected to the sulfur autotrophic denitrifier 6 and located below the carrier 7.

[0031] The internal circulation component is connected to the sulfur autotrophic denitrifier 6 at both ends. The internal circulation component is used to drive the biogas to circulate within the sulfur autotrophic denitrifier 6.

[0032] The external circulation component is connected at one end to the sulfur autotrophic denitrifier 6 and located above the carrier 7. The other end of the external circulation component is connected to the anaerobic reactor 1 and located inside the anaerobic granular sludge 2. The external circulation component is used to drive the biogas in the sulfur autotrophic denitrifier 6 to flow back into the anaerobic reactor 1.

[0033] Carrier 7 is the main packing material for sulfur autotrophic denitrification. The denitrifying sulfur bacteria present on the packing material use hydrogen sulfide in biogas and nitrate nitrogen in sewage for metabolism, thereby achieving the effect of denitrification and desulfurization.

[0034] Furthermore, the internal circulation component includes an air intake circulation pipe 8, one end of which is connected to the sulfur autotrophic denitrifier 6 and located below the carrier 7, the other end of which is fixedly connected to the inlet end of the circulation pump 9, the outlet end of the circulation pump 9 is fixedly connected to one end of the exhaust circulation pipe 10, and the other end of the exhaust circulation pipe 10 is connected to the sulfur autotrophic denitrifier 6 and located above the carrier 7.

[0035] The internal circulation component is used to increase the rate of sulfur autotrophic denitrification.

[0036] Furthermore, the outlet gas circulation pipe 10 is fixedly connected to a number of equally spaced circulating gas nozzles 11 at one end inside the sulfur autotrophic denitrifier 6.

[0037] Furthermore, the external circulation component includes a three-way valve 12. The first end of the three-way valve 12 is connected to the sulfur autotrophic denitrifier 6 and is located above the carrier 7. The second end of the three-way valve 12 is fixedly connected to the air inlet of the blower 14. The air outlet of the blower 14 is fixedly connected to one end of the biogas return pipe 13. The other end of the biogas return pipe 13 is connected to the anaerobic reactor 1 and is located inside the anaerobic granular sludge 2.

[0038] Furthermore, one end of the biogas return pipe 13 located inside the anaerobic granular sludge 2 is fixedly connected to several equally spaced return nozzles 15.

[0039] Furthermore, the third end of the tee 12 is fixedly connected to one end of the connecting gas pipe 16, and the other end of the connecting gas pipe 16 is fixedly connected to the biogas boiler.

[0040] Furthermore, one end of the biogas pipe 4 connected to the anaerobic reactor 1 is fixedly connected to a number of three-phase separators 3 arranged at equal intervals, and one end of the biogas pipe 4 connected to the sulfur autotrophic denitrifier 6 is fixedly connected to a number of biogas nozzles 5 arranged at equal intervals.

[0041] Biogas pipe 4 is the biogas supply system for the biogas stripping and sulfur autotrophic denitrification device, ensuring that the hydrogen sulfide in the biogas produced by anaerobic reactor 1 fully enters sulfur autotrophic denitrification device 6.

[0042] Furthermore, anaerobic reactor 1 is a UASB reactor.

[0043] Anaerobic reactor 1 is used to produce hydrogen sulfide.

[0044] The process flow of this utility model is as follows:

[0045] After being evenly distributed into anaerobic reactor 1 by a water distribution device, the wastewater from the leather processing plant is converted into biogas (methane, carbon dioxide, and a small amount of hydrogen sulfide) by anaerobic granular sludge 2 within the reactor. The biogas is collected by a three-phase separator 3 and then evenly distributed into the bottom of a sulfur autotrophic denitrifier 6 via a biogas pipe 4. Hydrogen sulfide dissolves in the wastewater and rises with the water flow into carrier 7. Within carrier 7, the dissolved hydrogen sulfide and nitrate nitrogen in the wastewater react under the action of denitrifying thiobacilli to produce elemental sulfur (sulfate) and nitrogen gas. Hydrogen sulfide is absorbed and utilized in the biogas passing through carrier 7. The remaining biogas is collected and sent to the bottom of anaerobic reactor 1 for stripping using a blower 14. When the pressure in the biogas circulation pipe becomes too high, a portion of the biogas is released.

[0046] The technological principle of this invention is as follows: Hydrogen sulfide from the biogas produced by anaerobic reactor 1 is used to remove NO from wastewater under the action of denitrifying thiobacilli. 3- (nitrate nitrogen) and NO 2- Nitrite nitrogen is converted to N2, and hydrogen sulfide and sulfides are converted to SO4. 2- Or elemental sulfur.

[0047] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0048] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements to the technical solutions of the present utility model made by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope of the present utility model.

Claims

1. A sulfur autotrophic device for denitrification and desulfurization of leather wastewater, characterized in that, include: An anaerobic reactor (1) is filled with anaerobic granular sludge (2) and produces biogas. A biogas pipe (4) is connected at one end to the anaerobic reactor (1) and located above the anaerobic granular sludge (2); The sulfur autotrophic denitrifier (6) is filled with a carrier (7), and the other end of the biogas pipe (4) is connected to the sulfur autotrophic denitrifier (6) and located below the carrier (7); The internal circulation component is connected to the sulfur autotrophic denitrifier (6) at both ends. The internal circulation component is used to drive biogas to circulate within the sulfur autotrophic denitrifier (6). The external circulation component is connected at one end to the sulfur autotrophic denitrifier (6) and located above the carrier (7). The other end of the external circulation component is connected to the anaerobic reactor (1) and located inside the anaerobic granular sludge (2). The external circulation component is used to drive the biogas in the sulfur autotrophic denitrifier (6) to flow back into the anaerobic reactor (1).

2. The sulfur autotrophic device for denitrification and desulfurization of leather wastewater according to claim 1, characterized in that, The internal circulation component includes an air intake circulation pipe (8), one end of which is connected to the sulfur autotrophic denitrifier (6) and located below the carrier (7). The other end of the air intake circulation pipe (8) is fixedly connected to the inlet end of a circulation pump (9). The outlet end of the circulation pump (9) is fixedly connected to one end of an exhaust circulation pipe (10), and the other end of the exhaust circulation pipe (10) is connected to the sulfur autotrophic denitrifier (6) and located above the carrier (7).

3. The sulfur autotrophic device for denitrification and desulfurization of leather wastewater according to claim 2, characterized in that, The outlet circulation pipe (10) is located inside the sulfur autotrophic denitrifier (6) and is fixedly connected to a number of equally spaced circulation gas nozzles (11).

4. The sulfur autotrophic device for denitrification and desulfurization of leather wastewater according to claim 1, characterized in that, The external circulation component includes a three-way valve (12). The first end of the three-way valve (12) is connected to the sulfur autotrophic denitrifier (6) and is located above the carrier (7). The second end of the three-way valve (12) is fixedly connected to the air inlet of the blower (14). The air outlet of the blower (14) is fixedly connected to one end of the biogas return pipe (13). The other end of the biogas return pipe (13) is connected to the anaerobic reactor (1) and is located inside the anaerobic granular sludge (2).

5. A sulfur autotrophic device for denitrification and desulfurization of leather wastewater according to claim 4, characterized in that, The biogas return pipe (13) is located inside the anaerobic granular sludge (2) and is fixedly connected to a number of equally spaced return nozzles (15).

6. A sulfur autotrophic device for denitrification and desulfurization of leather wastewater according to claim 4, characterized in that, The third end of the three-way valve (12) is fixedly connected to one end of a connecting gas pipe (16), and the other end of the connecting gas pipe (16) is fixedly connected to a biogas boiler.

7. A sulfur autotrophic device for denitrification and desulfurization of leather wastewater according to claim 1, characterized in that, The biogas pipe (4) is connected to the anaerobic reactor (1) at one end by a number of three-phase separators (3) arranged at equal intervals, and the biogas pipe (4) is connected to the sulfur autotrophic denitrifier (6) at one end by a number of biogas nozzles (5) arranged at equal intervals.

8. A sulfur autotrophic device for denitrification and desulfurization of leather wastewater according to claim 1, characterized in that, The anaerobic reactor (1) is a UASB reactor.

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