A device for blowing off hydrogen sulfide in a biogas anaerobic system

Abstract

This utility model relates to the field of leather wastewater treatment technology, and more particularly to a device for hydrogen sulfide removal in a biogas stripping anaerobic system. The device includes an anaerobic reaction assembly, a gas hood assembly, a gas-liquid separator, a desulfurization tower, and a blower. The anaerobic reaction assembly includes a reaction tank with a first inlet inserted into its side wall. The gas hood assembly includes a stripping gas collection hood fixed inside the reaction tank. Compared to traditional hydrogen sulfide removal devices in biogas stripping anaerobic systems, this utility model, by incorporating a gas hood assembly and a stripping perforated pipe, allows hydrogen sulfide to be stripped through the perforated pipe and collected by the stripping gas collection hood. The hydrogen sulfide is then lifted to the gas-liquid separator for gas-liquid separation and drying, and finally desulfurized by the desulfurization tower. Activating the blower accelerates the biogas flow rate, allowing the biogas to re-enter the reaction tank, stripping perforated pipe, and stripping gas collection hood, thereby reducing the hydrogen sulfide content inside the reaction tank, reducing inhibition of anaerobic bacteria, and thus improving the efficiency of anaerobic treatment of leather wastewater.

Description

Technical Field

[0001] This utility model relates to the field of leather wastewater treatment technology, and in particular to a device for hydrogen sulfide removal in a biogas stripping anaerobic system. Background Technology

[0002] Biogas is a byproduct of leather wastewater treatment. The wastewater generated during leather processing contains a large amount of organic matter (such as protein, oil, dye, etc.), suspended solids, and heavy metals. Its high concentration of organic pollutants makes it a potential raw material for anaerobic digestion to produce biogas. In the wastewater treatment process, after pretreatment to remove suspended solids and some heavy metals, it enters the anaerobic biological treatment stage (such as UASB, anaerobic digester, etc.). Anaerobic microorganisms decompose organic matter into gases such as methane and carbon dioxide to form biogas.

[0003] Currently, most leather wastewater treatment processes use a combination of physicochemical and aerobic biological treatment. Physicochemical methods involve adding large amounts of chemicals, resulting in a large amount of sludge and hazardous waste. Aerobic processes have high loads, high energy consumption, high operating costs, and strong odors during aeration, which seriously affect the lives of nearby residents. At the same time, aerobic processes generate a large amount of excess sludge, which is expensive to treat.

[0004] Currently, in the anaerobic treatment of leather wastewater, the extensive use of sulfuric acid and other sulfur-containing chemicals during leather production results in high concentrations of sulfates or other sulfur-containing compounds in the wastewater. This wastewater is converted into sulfides by anaerobic microorganisms. High concentrations of sulfides are toxic to anaerobic microorganisms, thus inhibiting the normal operation of the anaerobic treatment process. At a pH range of 6.4-7.2, the sulfide level resulting in 50% inhibition is 250 mgS / l, and at a pH range of 7.8-8.0, the sulfide level resulting in 50% inhibition is 90 mgS / l. Besides inhibiting the operation of the anaerobic process, the generated hydrogen sulfide (H2S) also corrodes equipment and pipelines and pollutes biogas (methane). Utility Model Content

[0005] In order to overcome the problems of high sulfide concentrations in existing anaerobic treatment of leather wastewater, which are toxic to anaerobic microorganisms and thus inhibit the normal operation of the anaerobic treatment process, as well as the problems of hydrogen sulfide produced corroding equipment and pipelines and polluting biogas.

[0006] The technical solution of this utility model is as follows: a device for removing hydrogen sulfide in a biogas stripping anaerobic system, comprising an anaerobic reaction component, a gas hood component, a gas-liquid separator, a desulfurization tower, and a blower. The anaerobic reaction component includes a reaction tank with a first water inlet inserted into its side wall. The gas hood component includes a stripping gas collection hood fixed inside the reaction tank and a first air inlet inserted into the side of the reaction tank. A first exhaust port is inserted into the top of the stripping gas collection hood. A first water outlet is inserted into the side wall of the reaction tank near the top of the stripping gas collection hood. The gas-liquid separator is fixed to the top of the reaction tank with a second air outlet inserted into its top and a fourth air inlet inserted into its side wall. The desulfurization tower has a fourth air outlet inserted into its top and a third air inlet inserted into its side wall. The blower is fixed to the ground near the first air inlet. A stripping perforated pipe is provided inside the reaction tank.

[0007] Furthermore, a pipe is inserted at the top of the first exhaust port to connect with the fourth air inlet, and a return port is inserted at the bottom of the gas-liquid separator. A pipe is inserted at the bottom of the return port to run from the inside of the reaction tank to the bottom, which improves the convenience of biogas drying.

[0008] Furthermore, a second inlet is inserted into the side wall of the reaction tank away from the first inlet, and a second outlet is inserted into the side wall of the reaction tank near the bottom of the stripping gas collection hood. A first circulation pump is installed on the side wall of the reaction tank, and pipes are inserted into both ends of the first circulation pump to connect to the second inlet and the second outlet, respectively, which improves the convenience of wastewater circulation.

[0009] Furthermore, the blow-off perforated pipe is installed inside the blow-off gas collection hood. The blow-off perforated pipe is connected to the first air inlet. Several holes are opened on the pipe wall of the blow-off perforated pipe to improve the uniformity of biogas recirculation.

[0010] Furthermore, a pipe is inserted into the end of the second gas outlet to connect with the third gas inlet, improving the convenience of biogas storage.

[0011] Furthermore, a pipe is inserted into the inlet at the top of the fan and connected to the fourth outlet, and a pipe is inserted into the outlet on the side wall of the fan and connected to the first inlet.

[0012] Furthermore, a drain port is inserted at the bottom of the desulfurization tower, and the interior of the desulfurization tower is filled with hydrogen sulfide absorbent. A spray pipe is fixed on the inner side wall of the desulfurization tower, and a return port is inserted on the side wall of the desulfurization tower. A second circulation pump is installed at the bottom of the desulfurization tower, and the return port is connected to the spray pipe, which improves the efficiency and quality of biogas desulfurization.

[0013] Furthermore, the two ends of the second circulation pump are connected to the drain port and the return port respectively through pipes, and a filter is inserted into the end of the second circulation pump near the drain port.

[0014] The beneficial effects of this utility model are:

[0015] Compared to traditional hydrogen sulfide devices in biogas stripping anaerobic systems, this system incorporates a gas hood assembly and a stripping perforated pipe. The hydrogen sulfide is stripped through the perforated pipe and collected by the stripping gas collection hood, then lifted to a gas-liquid separator for gas-liquid separation and drying. Finally, it is desulfurized by a desulfurization tower. By starting a blower, the biogas flow rate can be accelerated, and the biogas re-enters the reaction tank, the stripping perforated pipe, and the stripping gas collection hood, thereby reducing the hydrogen sulfide content inside the reaction tank, reducing the inhibition of anaerobic bacteria, and thus improving the anaerobic treatment efficiency of leather wastewater.

[0016] Secondly, by setting up a first circulation pump, a second outlet, and a second inlet, starting the first circulation pump can accelerate the return of treated wastewater, thereby diluting the wastewater concentration and improving the activity of anaerobic bacteria.

[0017] Finally, by setting up a second circulation pump and a filter, starting the second circulation pump can circulate and spray the hydrogen sulfide absorbent, and the filter can filter out impurity particles, thus improving the stability of the absorbent circulation. Attached Figure Description

[0018] Figure 1 The diagram shown illustrates the overall structure of the hydrogen sulfide removal device in the biogas stripping anaerobic system of this invention. Figure 1 ;

[0019] Figure 2 The diagram shown illustrates the overall structure of the hydrogen sulfide removal device in the biogas stripping anaerobic system of this invention. Figure 2 ;

[0020] Figure 3 The diagram shown is a schematic representation of the structure of the air hood assembly of this utility model.

[0021] Figure 4 The diagram shown is a schematic representation of the structure of the reaction vessel of this utility model;

[0022] Figure 5 The diagram shown is a schematic representation of the desulfurization tower structure of this utility model.

[0023] Explanation of reference numerals in the attached drawings: 1. Anaerobic reaction assembly; 101. Reaction tank; 102. First water inlet; 103. First water outlet; 104. Second water outlet; 105. Second water inlet; 2. First circulating pump; 3. Gas hood assembly; 301. Stripping gas collection hood; 302. First air inlet; 303. First exhaust port; 4. Gas-liquid separator; 5. Second air outlet; 6. Return port; 10. Desulfurization tower; 11. Fourth air outlet; 12. Fan; 13. Liquid outlet; 14. Second circulating pump; 15. Liquid return port; 16. Third air inlet; 17. Fourth air inlet; 18. Stripping perforated pipe; 19. Filter. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Please refer to Figures 1-5 A device for removing hydrogen sulfide from a biogas stripping anaerobic system includes an anaerobic reaction assembly 1, a gas hood assembly 3, a gas-liquid separator 4, a desulfurization tower 10, and a blower 12. The anaerobic reaction assembly 1 includes a reaction tank 101, with a first water inlet 102 inserted into the side wall of the reaction tank 101. The gas hood assembly 3 includes a stripping gas collection hood 301 fixed inside the reaction tank 101, and a first air inlet 302 inserted into the upper part of the reaction tank 101. A first exhaust port 303 is inserted into the top of the stripping gas collection hood 301. The reaction tank 101 is located near the stripping gas collection hood. A first water outlet 103 is inserted into the side wall above the reaction tank 101. A gas-liquid separator 4 is fixed to the top of the reaction tank 101. A second air outlet 5 is inserted into the top of the gas-liquid separator 4. A fourth air inlet 17 is inserted into the side wall of the gas-liquid separator 4. A pipe is inserted into the top of the first exhaust port 303, connecting it to the fourth air inlet 17. A reflux port 6 is inserted into the bottom of the gas-liquid separator 4. A pipe is inserted into the bottom of the reflux port 6, leading from the inside of the reaction tank 101 to the bottom, improving the convenience of biogas drying. A fourth air outlet 11 is inserted into the top of the desulfurization tower 10. A third air inlet 16 is inserted into the side of the desulfurization tower 10, and a drain outlet 13 is inserted into the bottom of the desulfurization tower 10. The interior of the desulfurization tower 10 is filled with hydrogen sulfide absorbent, which can react with hydrogen sulfide to remove sulfur. A spray pipe is fixed on the inner wall of the desulfurization tower 10 to spray the hydrogen sulfide absorbent to improve the biogas contact reaction efficiency, thereby improving the efficiency and quality of biogas desulfurization. The blower 12 is fixed on the ground near the first air inlet 302. The input port at the top of the blower 12 is connected to a pipe that connects to the fourth air outlet 11, and the output end on the side wall of the blower 12 is connected to the first air outlet 11. The air inlet 302 is connected, and starting the blower 12 can accelerate the biogas flow rate. The reaction tank 101 is equipped with a stripping perforated pipe 18, which is located inside the stripping gas collection hood 301. Hydrogen sulfide generated during the anaerobic reaction is stripped through the stripping perforated pipe 18 and collected by the stripping gas collection hood 301. Several holes are opened on the pipe wall of the stripping perforated pipe 18, which improves the uniformity of biogas reflux dispersion, thereby reducing the hydrogen sulfide content inside the reaction tank 101, thereby reducing the inhibition of anaerobic bacteria and improving the anaerobic treatment efficiency of leather wastewater.

[0026] A second inlet 105 is inserted into the side wall of the reaction tank 101 away from the first inlet 102. A second outlet 104 is inserted into the side wall of the reaction tank 101 near the bottom of the stripping gas collection hood 301. A first circulation pump 2 is installed on the side wall of the reaction tank 101. Pipes are inserted into both ends of the first circulation pump 2 and connected to the second inlet 105 and the second outlet 104, which improves the convenience of wastewater circulation. Starting the first circulation pump 2 can transport the pre-treated wastewater inside the reaction tank 101 back to the bottom of the reaction tank 101 for anaerobic treatment and purification.

[0027] The end of the second air outlet 5 is connected to a pipe that connects to the third air inlet 16.

[0028] A return port 15 is inserted into the side wall of the desulfurization tower 10. A second circulation pump 14 is installed at the bottom of the desulfurization tower 10. The return port 15 is connected to the spray pipe. The two ends of the second circulation pump 14 are connected to the drain port 13 and the return port 15 through pipes respectively. A filter 19 is inserted into the end of the second circulation pump 14 near the drain port 13.

[0029] When using the hydrogen sulfide removal device in this biogas stripping anaerobic system, the operator first delivers leather wastewater to the interior of the reaction tank 101 through the first inlet 102 for anaerobic treatment and purification. The hydrogen sulfide generated during the anaerobic reaction is stripped through the stripping perforated pipe 18 and collected by the stripping gas collection hood 301. The biogas stripping gas lift pipe then elevates the gas to the gas-liquid separator 4 for gas-liquid separation and drying. The liquid flows back into the reaction tank 101 through the return port 6. The biogas is discharged into the gas storage tank 7 through the second outlet 5 for temporary buffering and storage. When biogas needs to be processed, the end of the third outlet 9 is opened. The valve allows biogas to be injected into the bottom of the desulfurization tower 10, where it reacts with the hydrogen sulfide absorbent to reduce the hydrogen sulfide content. The spray pipe is used to spray the hydrogen sulfide absorbent to improve the biogas contact reaction efficiency, thereby improving the efficiency and quality of biogas desulfurization. The desulfurized biogas is discharged from the fourth outlet 11, pressurized by the blower 12, and then enters the reaction tank 101 from the first inlet 302. The gas is then dispersed by the blow-off perforated pipe 18 to blow off the hydrogen sulfide generated during the anaerobic reaction, thereby reducing the hydrogen sulfide content inside the reaction tank 101, thus reducing the inhibition of anaerobic bacteria and improving the anaerobic treatment efficiency of leather wastewater.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for hydrogen sulfide stripping in a biogas stripping anaerobic system, characterized in that, The system includes an anaerobic reaction assembly (1), a gas hood assembly (3), a gas-liquid separator (4), a desulfurization tower (10), and a blower (12). The anaerobic reaction assembly (1) includes a reaction tank (101), with a first water inlet (102) inserted into the side wall of the reaction tank (101). The gas hood assembly (3) includes a stripping gas collection hood (301) fixed inside the reaction tank (101), and a first air inlet (302) inserted into the side of the reaction tank (101). A first exhaust port (303) is inserted into the top of the stripping gas collection hood (301). The reaction tank (101) is close to... A first water outlet (103) is inserted into the side wall above the stripping gas collection hood (301). A gas-liquid separator (4) is fixed at the top of the reaction tank (101). A second air outlet (5) is inserted into the top of the gas-liquid separator (4). A fourth air inlet (17) is inserted into the side wall of the gas-liquid separator (4). A fourth air outlet (11) is inserted into the top of the desulfurization tower (10). A third air inlet (16) is inserted into the side wall of the desulfurization tower (10). A blower (12) is fixed on the ground near the first air inlet (302). A stripping perforated pipe (18) is provided inside the reaction tank (101).

2. The apparatus for hydrogen sulfide stripping in a biogas stripping anaerobic system according to claim 1, characterized in that: The top of the first exhaust port (303) is connected to a pipe that connects to the fourth air inlet (17). The bottom of the gas-liquid separator (4) is connected to a return port (6). The bottom of the return port (6) is connected to a pipe that runs from the inside of the reaction tank (101) to the bottom.

3. The apparatus for hydrogen sulfide stripping in a biogas stripping anaerobic system according to claim 1, characterized in that: A second inlet (105) is inserted into the side wall of the reaction tank (101) away from the first inlet (102). A second outlet (104) is inserted into the side wall of the reaction tank (101) near the bottom of the stripping gas collection hood (301). A first circulation pump (2) is installed on the side wall of the reaction tank (101). Pipes are inserted into both ends of the first circulation pump (2) and connected to the second inlet (105) and the second outlet (104).

4. The apparatus for hydrogen sulfide stripping in a biogas stripping anaerobic system according to claim 1, characterized in that: The blow-off perforated pipe (18) is installed inside the blow-off gas collection hood (301). The blow-off perforated pipe (18) is connected to the first air inlet (302). Several holes are opened on the pipe wall of the blow-off perforated pipe (18).

5. The apparatus for hydrogen sulfide stripping in a biogas stripping anaerobic system according to claim 1, characterized in that: The end of the second air outlet (5) is connected to a pipe that connects to the third air inlet (16).

6. The apparatus for hydrogen sulfide stripping in a biogas stripping anaerobic system according to claim 1, characterized in that: The inlet at the top of the fan (12) is connected to the fourth outlet (11) by a pipe, and the outlet on the side wall of the fan (12) is connected to the first inlet (302) by a pipe.

7. The apparatus for hydrogen sulfide stripping in a biogas stripping anaerobic system according to claim 1, characterized in that: A drain port (13) is inserted at the bottom of the desulfurization tower (10). The interior of the desulfurization tower (10) is filled with hydrogen sulfide absorbent. A spray pipe is fixed on the inner side wall of the desulfurization tower (10). A return port (15) is inserted on the side wall of the desulfurization tower (10). A second circulation pump (14) is installed at the bottom of the desulfurization tower (10). The return port (15) is connected to the spray pipe.

8. The apparatus for hydrogen sulfide removal in a biogas stripping anaerobic system according to claim 1, characterized in that: The two ends of the second circulation pump (14) are connected to the drain port (13) and the return port (15) respectively through pipes. A filter (19) is inserted into the end of the second circulation pump (14) near the drain port (13).

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