A biological treatment device to reduce N2O production

Abstract

This utility model discloses a biological treatment device for reducing N2O generation, relating to the field of wastewater treatment technology. It includes an aeration tank with several inlet pipes at its front end. Each inlet pipe has a treatment tank at its top end. A filter membrane is installed inside each treatment tank. An inlet pipe is installed at the front end of each treatment tank above the filter membrane. The front ends of the inlet pipes are connected to a diversion pipe. Activated sludge is placed above the filter membrane. A connecting pipe connects two adjacent treatment tanks above the activated sludge. This utility model, through a series of structural features, allows for preliminary N2O removal from wastewater before it enters the aeration tank, reducing the purification load on the aeration tank, decreasing N2O generation, and preventing the wastewater from disturbing the sludge at the bottom of the aeration tank during input, thus increasing sludge age and promoting complete nitrification.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a biological treatment device for reducing N2O production. Background Technology

[0002] N2O is an important greenhouse gas with a greenhouse effect 296 times that of CO2. At the same time, N2O is also a substance that destroys the ozone layer. Therefore, how to effectively reduce the generation and release of N2O has become one of the hot issues of concern to researchers at home and abroad in recent years.

[0003] Municipal wastewater treatment plants are a significant source of nitrogen (N2O). In the biological denitrification stage, these plants remove pollutants such as organic matter, nitrogen, and phosphorus from wastewater through microbial metabolism. During biological denitrification, N2O is produced as an intermediate product. When wastewater is transported to the aeration tank, the impact force generated can disrupt the sludge at the bottom of the tank, affecting sludge age and thus the nitrification reaction, potentially leading to the release of N2O. Utility Model Content

[0004] The purpose of this invention is to provide a biological treatment device that reduces N2O generation, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a biological treatment device for reducing N2O generation, comprising an aeration tank, with several input pipes at the front end of the aeration tank, each input pipe being L-shaped, and a treatment tank at the top of each input pipe. A filter membrane is disposed inside each treatment tank, and an inlet pipe is disposed at the front end of each treatment tank above the filter membrane. A diversion pipe is connected to the front ends of the several inlet pipes. Activated sludge is placed above the filter membrane, and a connecting pipe connects two adjacent treatment tanks above the activated sludge. The leftmost treatment tank... A fan is installed on one side of the treatment tank, and a gas supply pipe is installed on the right side of the treatment tank. A gas treatment tank is installed on one side of the gas supply pipe. A conical base is installed inside the gas treatment tank. A gas riser is installed in the middle of the conical base. The gas riser is a hollow cylindrical component. Several holes are provided through the top circumferential surface of the gas riser. Several drainage holes are arranged at the top edge of the conical base. A cavity is provided inside the conical base, and the top of the cavity is connected to the drainage holes. A sprayer is installed inside the gas treatment tank above the conical base.

[0006] Preferably, one side of the sprayer is provided with an adsorption liquid delivery pipe, and one side of the adsorption liquid delivery pipe extends out of one side of the gas treatment tank. The adsorption liquid delivery pipe contains a water pump and is connected to a liquid storage device. The adsorption liquid contains ethanolamine. Amine substances have a certain alkalinity and can react with acidic or reactive gas molecules to adsorb and treat N2O in the gas.

[0007] Preferably, the bottom of the conical chassis is provided with a drain pipe, and one side of the drain pipe extends out of one side of the gas treatment tank. The top of the drain pipe is in communication with the cavity. When the liquid sprayed by the sprayer adsorbs N2O in the gas and falls to the top of the conical chassis, the liquid flows from the top of the conical chassis to the edge and flows into the cavity through the drain hole. Then the liquid is discharged through the drain pipe. A receiving and collecting device outside the drain pipe collects the liquid after adsorbing N2O.

[0008] Preferably, the gas treatment tank is provided with a bottom pad at the top, and a filter element placement rack is provided at the top of the bottom pad. An activated carbon filter element is placed inside the filter element placement rack. When the gas treatment tank finishes treating the gas, it is discharged through the top. During the discharge process, the gas is adsorbed by the activated carbon filter element for further purification.

[0009] Preferably, the top of the gas riser is provided with a conical top. When the gas riser conveys gas upward, the sprayer sprays liquid. When the liquid falls, it is blocked by the conical top to prevent the liquid from falling onto the circumferential surface of the gas riser.

[0010] Preferably, an extension plate is provided at the top edge of the conical chassis, which protects the top edge of the conical chassis and ensures that liquid can flow into the cavity through the drain hole.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. This biological treatment device for reducing N2O generation comprises several treatment tanks. Activated sludge is placed inside each tank via a filter membrane. During wastewater treatment, a diversion pipe distributes the wastewater to each of the treatment tanks. An activated sludge layer is positioned above the filter membrane 10 of the membrane bioreactor (MBR), where enriched denitrifying bacteria reduce nitrate nitrogen to nitrogen gas under anaerobic or anoxic conditions. The enriched denitrifying bacteria exhibit an increased expression of N2O reductase, enhancing N2O reduction and reducing its generation and release. During denitrification, gas carrying some N2O is generated. This gas is blown by a blower and transported through connecting pipes and gas delivery pipes to the gas treatment tank, where it is adsorbed by an adsorption liquid sprayed inside the tank. The adsorption liquid contains monoethanolamine, and amines have a certain degree of alkalinity, which can react with acidic or reactive gas molecules to adsorb and treat the N2O in the gas. This allows for the preliminary removal of N2O from the wastewater before it enters the aeration tank, reducing the purification load on the aeration tank and decreasing N2O production.

[0013] 2. This biological treatment device for reducing N2O production introduces wastewater into the aeration tank through multiple openings via several inlet pipes. This prevents the wastewater from disrupting the sludge at the bottom of the aeration tank during the input process, thereby increasing the sludge age and promoting complete nitrification. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic cross-sectional view of the treatment tank structure of this utility model;

[0016] Figure 3 This is a schematic cross-sectional view of the gas treatment tank structure of this utility model;

[0017] Figure 4 This is a schematic cross-sectional view of the conical structure of this utility model;

[0018] Figure 5 This is a cross-sectional schematic diagram of the filter element placement rack structure of this utility model.

[0019] In the diagram: 1. Aeration tank; 2. Input pipe; 3. Blower; 4. Diversion pipe; 5. Treatment tank; 6. Inlet pipe; 7. Gas transmission pipe; 8. Gas treatment tank; 9. Connecting pipe; 10. Filter membrane; 11. Adsorbent liquid delivery pipe; 12. Filter cartridge rack; 13. Base pad; 14. Sprayer; 15. Conical base; 16. Drain pipe; 17. Cavity; 18. Gas riser; 19. Extension plate; 20. Activated carbon filter cartridge; 21. Conical top; 22. Drain hole. Detailed Implementation

[0020] 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.

[0021] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, 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. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] like Figures 1 to 5As shown, this embodiment of the biological treatment device for reducing N2O generation includes an aeration tank 1. Several input pipes 2, each L-shaped, are installed at the front end of the aeration tank 1. Each input pipe 2 has a treatment tank 5 at its top. A filter membrane 10 is installed inside the treatment tank 5. An inlet pipe 6 is installed at the front end of each treatment tank 5 above the filter membrane 10. The front ends of the inlet pipes 6 are connected to a diversion pipe 4. An activated sludge layer is installed above the filter membrane 10 of the membrane bioreactor (MBR). The denitrifying bacteria enriched in this layer reduce nitrate nitrogen to nitrogen gas under anaerobic or anoxic conditions. The enriched denitrifying bacteria exhibit an increased expression of N2O reductase, enhancing N2O reduction and reducing its generation and release. This effectively suppresses the emission of the greenhouse gas N2O. When wastewater is discharged into treatment tank 5, it is above the activated sludge. A connecting pipe 9 connects two adjacent treatment tanks 5 above the activated sludge. A blower 3 is installed on the leftmost side of treatment tank 5, and a gas supply pipe 7 is installed on the rightmost side. A gas treatment tank 8 is installed on one side of the gas supply pipe 7. After the wastewater is treated by the activated sludge in several treatment tanks 5, it will generate some N2O-carrying gas. This gas is blown by the blower 3 and transported through the connecting pipe 9 and the gas supply pipe 7 to the gas treatment tank 8. The gas treatment tank 8 has a conical base 15 inside. A gas riser 18 is installed in the middle of the conical base 15. The gas riser 18 is a hollow cylindrical component, and a perforated section is installed on the top circumferential surface of the gas riser 18. Several holes are provided. When gas enters the gas treatment tank 8, it is transported upward through the gas riser 18. Several drain holes 22 are provided at the top edge of the conical base 15. A cavity 17 is provided inside the conical base 15, and the top of the cavity 17 is connected to the drain holes 22. A sprayer 14 is provided inside the gas treatment tank 8 above the conical base 15. When the gas moves upward, the sprayer 14 will discharge the adsorbed liquid. The adsorbed liquid is mixed with ethanolamine. Amines have a certain alkalinity and can react with acidic or reactive gas molecules to adsorb N2O in the gas. The adsorbed liquid falls to the top of the conical base 15 and then flows to the edge and into the cavity 17 through the drain holes 22.

[0023] Specifically, an adsorption liquid delivery pipe 11 is provided on one side of the sprayer 14, and one side of the adsorption liquid delivery pipe 11 extends out of one side of the gas treatment tank 8. The adsorption liquid delivery pipe 11 contains a water pump, and a liquid storage device is connected to the outside of the adsorption liquid delivery pipe 11. The adsorption liquid contains ethanolamine. Amine substances have a certain alkalinity and can react with acidic or reactive gas molecules to adsorb and treat N2O in the gas.

[0024] Furthermore, a drain pipe 16 is provided at the bottom of the conical chassis 15, and one side of the drain pipe 16 extends out of one side of the gas treatment tank 8. The top of the drain pipe 16 is in communication with the cavity 17. When the liquid sprayed by the sprayer 14 adsorbs N2O in the gas and falls to the top of the conical chassis 15, the liquid flows from the top of the conical chassis 15 to the edge and flows into the cavity 17 through the drain hole 22. Then the liquid is discharged through the drain pipe 16. The drain pipe 16 is connected to a collection device to collect the liquid after adsorbing N2O.

[0025] Furthermore, a base pad 13 is provided on the top of the gas treatment tank 8, and a filter element placement rack 12 is provided on the top of the base pad 13. An activated carbon filter element 20 is placed inside the filter element placement rack 12. When the gas treatment tank 8 finishes treating the gas, it is discharged through the top. During the discharge process, the gas is adsorbed by the activated carbon filter element 20 for further purification.

[0026] Furthermore, the top of the gas riser 18 is provided with a conical top 21. When the gas riser 18 conveys gas upward, the sprayer 14 sprays liquid. When the liquid falls, it is blocked by the conical top 21 to prevent the liquid from falling onto the circumferential surface of the gas riser 18.

[0027] Furthermore, an extension plate 19 is provided at the top edge of the conical chassis 15. The extension plate 19 protects the top edge of the conical chassis 15, ensuring that liquid can flow into the cavity 17 through the drain hole 22.

[0028] The method of use in this embodiment is as follows: During wastewater treatment, a wastewater inlet is connected to the front end of the diversion pipe 4. Wastewater is fed into the inlet pipe 6 through the diversion pipe 4, and then transported to several treatment tanks 5 through the inlet pipe 6. Activated sludge is placed inside the treatment tanks 5 through filter membranes 10. An activated sludge layer is placed above the filter membrane 10 of the membrane bioreactor (MBR). The enriched denitrifying bacteria in this layer reduce nitrate nitrogen to nitrogen gas under anaerobic or anoxic conditions. The increased expression of N2O reductase (Nos) in the enriched denitrifying bacteria enhances N2O reduction and reduces its production and release, thereby effectively suppressing the emission of the greenhouse gas N2O. Wastewater continuously permeates the activated sludge and filter membrane 10, seeping into the bottom of the treatment tank 5. During this permeation process, some N2O-carrying gas is generated. This gas is blown by the blower 3 and transported through the connecting pipe 9 and the gas supply pipe 7 to the gas treatment tank 8. Inside the gas treatment tank 8, the gas is then conveyed upwards by the gas riser 18. As the gas moves upwards, the sprayer 14 discharges the adsorbed liquid. The adsorbed liquid contains ethanolamine, which has a certain alkalinity and can react with acidic or reactive gas molecules to adsorb the N2O in the gas. The adsorbed liquid falls to the top of the conical base 15 and then flows towards the edge, entering the cavity 17 through the drain hole 22. In the first section, the liquid flows from the top of the conical base 15 to the edge, flows into the cavity 17 through the drain hole 22, and then the liquid is discharged through the drain pipe 16. The drain pipe 16 is connected to a collection device to collect the liquid after N2O adsorption. The treated gas is discharged through the top of the gas treatment tank 8. During the discharge process, the gas is further purified by the adsorption of the activated carbon filter element 20. The pre-treated wastewater is transported to the aeration tank 1 through several input pipes 2 to reduce the impact force generated by the wastewater entering the aeration tank 1 and to prevent the sludge at the bottom of the aeration tank 1 from being excessively impacted and disturbed, thereby increasing the sludge age. At the same time, a portion of the wastewater in the aeration tank 1 is returned to the front end through the connecting pipe to continue denitrification.

[0029] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A biological treatment device for reducing N2O generation, comprising an aeration tank (1), characterized in that: The aeration tank (1) is provided with several input pipes (2) at its front end. Each input pipe (2) is an L-shaped component. Each input pipe (2) has a treatment tank (5) at its front end. Each treatment tank (5) has a filter membrane (10) inside. Each treatment tank (5) above the filter membrane (10) has an inlet pipe (6) at its front end. The front ends of each inlet pipe (6) are connected to a diversion pipe (4). Activated sludge is placed on top of the filter membrane (10). A connecting pipe (9) connects two adjacent treatment tanks (5) above the activated sludge. A blower (3) is provided on the leftmost side of the treatment tank (5), and an air supply pipe is provided on the rightmost side of the treatment tank (5). (7) A gas treatment tank (8) is provided on one side of the gas pipeline (7). A conical base (15) is provided inside the gas treatment tank (8). A gas riser (18) is provided in the middle of the conical base (15). The gas riser (18) is a hollow cylindrical component. Several holes are provided through the top circumferential surface of the gas riser (18). Several drain holes (22) are provided at the top edge of the conical base (15). A cavity (17) is provided inside the conical base (15), and the top of the cavity (17) is connected to the drain holes (22). A sprayer (14) is provided inside the gas treatment tank (8) above the conical base (15).

2. The biological treatment device for reducing N2O generation according to claim 1, characterized in that: The sprayer (14) is provided with an adsorption liquid delivery pipe (11) on one side, and one side of the adsorption liquid delivery pipe (11) extends out of one side of the gas treatment tank (8).

3. The biological treatment device for reducing N2O generation according to claim 1, characterized in that: The bottom of the conical chassis (15) is provided with a drain pipe (16), and one side of the drain pipe (16) extends out of one side of the gas treatment tank (8). The top of the drain pipe (16) is in communication with the cavity (17).

4. The biological treatment device for reducing N2O generation according to claim 1, characterized in that: The gas treatment tank (8) is provided with a bottom pad (13) on top, and a filter element placement rack (12) is provided at the top of the bottom pad (13). An activated carbon filter element (20) is placed inside the filter element placement rack (12).

5. The biological treatment device for reducing N2O generation according to claim 1, characterized in that: The top of the gas riser (18) is provided with a conical top (21).

6. The biological treatment device for reducing N2O generation according to claim 1, characterized in that: An extension plate (19) is provided at the top edge of the conical chassis (15).

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