Low-carbon-source denitrification system for rural domestic sewage

Abstract

The utility model discloses a low carbon source denitrification system for rural domestic sewage, which comprises an adjusting tank, a nitrification and denitrification tank and a mud-water separation system, a nitrification reaction bin and a denitrification reaction bin are arranged on the inner side of the nitrification and denitrification tank, a biological agent adding component is mounted above the denitrification reaction bin, and a sludge-water separation component is mounted above the sludge-water separation system. The biological agent adding component comprises a plurality of concentric annular injection pipes with different diameters and a water inlet pipe, and a plurality of branch water pipes are fixed to the bottom of one end of the water inlet pipe. The biological agent for enhancing biological denitrification and enhancing microbial activity is added into the plurality of annular injection pipes with the same circle center, and then clear water is added into the annular injection pipes, so that the clear water circularly flows in the annular injection pipes, and the biological agent for enhancing biological denitrification and enhancing microbial activity is uniformly dissolved; and uniformly adding the dissolved biological agent for enhancing biological denitrification and enhancing microbial activity into the nitrification and denitrification tank.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a low-carbon source denitrification system for rural domestic sewage. Background Technology

[0002] Domestic sewage is wastewater discharged from residents' daily lives. It mainly comes from residential and public buildings, such as houses, government offices, schools, hospitals, shops, public places, and industrial enterprise toilets. The pollutants contained in domestic sewage are mainly organic matter (such as protein, carbohydrates, fats, etc.), nitrogen, phosphorus, and a large number of pathogenic microorganisms (such as parasite eggs and intestinal infectious viruses, etc.).

[0003] Domestic sewage requires filtration, flocculation, aeration, and nitrogen and phosphorus removal during treatment. The application of nitrification in sewage treatment mainly involves nitrifying bacteria converting ammonia nitrogen into nitrate, providing conditions for the subsequent denitrification process. Nitrification is one of the important steps in nitrogen removal in sewage treatment. Through the action of nitrifying bacteria, ammonia nitrogen is oxidized into nitrite and nitrate, and then, in the presence of a carbon source, nitrite and nitrate are converted into nitrogen gas through denitrification, thus completing the removal of nitrogen pollutants.

[0004] However, rural domestic sewage has a relatively low carbon source, which leads to a decrease in the denitrification reaction rate and a reduction in sewage treatment efficiency, thus requiring the addition of advanced treatment systems and carbon source supplementation. Therefore, it does not meet the existing needs. In response, we propose a low-carbon source denitrification system for rural domestic sewage. Utility Model Content

[0005] The purpose of this invention is to provide a low-carbon source denitrification system for rural domestic sewage, in order to solve the problems mentioned in the background art, such as the low carbon source in rural domestic sewage leading to a decrease in the denitrification reaction rate and a reduction in sewage treatment efficiency.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a low-carbon source denitrification system for rural domestic sewage, comprising an equalization tank, a nitrification-denitrification tank, and a sludge-water separation system. The nitrification-denitrification tank has a nitrification reaction chamber and a denitrification reaction chamber on its inner side. A biological agent addition component is installed above the denitrification reaction chamber. The biological agent addition component includes multiple concentric annular injection pipes of different diameters and an inlet pipe. Multiple branch water pipes are fixed to the bottom of one end of the inlet pipe. The number of branch water pipes is the same as the number of annular injection pipes, and the branch water pipes... The bottom end is inserted into the annular injection tube. The outer surface of the annular injection tube is provided with a feeding hole, which is sealed with a rubber plug. A rotating bottom tube is movably installed at the bottom of the annular injection tube. Multiple nozzles are fixed at the bottom of the rotating bottom tube in a circular array around its center. Multiple baffles are fixed at the upper surface of the rotating bottom tube in a circular array around its center. The baffles are vertically upward and do not contact the inner wall of the annular injection tube. Branch water pipes are fixed on both sides of the rotating bottom tube. The rotating bottom tube is suspended from the bottom of the annular injection tube through the branch water pipes.

[0007] Preferably, multiple support rods are fixed to the outer side of the annular injection pipe located at the outermost ring. The support rods are bent in an L-shape and their bottom ends are fixed to the nitrification-denitrification tank.

[0008] Preferably, multiple connecting rods are fixed between each of the two adjacent annular injection tubes, and the connecting rods are arranged in a circular array around the center of the annular injection tube.

[0009] Preferably, the branch water pipe includes a straight pipe body, a connecting bend, and an inclined outlet pipe. The top end of the straight pipe body is fixed to the bottom of the inlet pipe, and the bottom end of the straight pipe body is inserted into the annular injection pipe.

[0010] Preferably, the connecting bend is fixed to the bottom end of the straight pipe and is curved, the inclined outlet pipe is fixed to the bottom end of the connecting bend and is inclined towards the baffle, and the angle between the inclined outlet pipe and the baffle is 45 degrees.

[0011] Preferably, both the equalization tank and the sludge-water separation system have a first conveying pipe fixed inside. One end of the first conveying pipe connected to the sludge-water separation system passes through the nitrification-denitrification tank and extends to the inside of the denitrification reaction chamber. One end of the first conveying pipe connected to the equalization tank passes through the nitrification-denitrification tank and extends to the inside of the nitrification reaction chamber.

[0012] Preferably, a second conveying pipe is fixedly connected between the nitrification reaction chamber and the denitrification reaction chamber. A sludge return main pipe is fixed at the bottom of the sludge-water separation system. One end of the sludge return main pipe passes through the bottom of the nitrification-denitrification tank and is connected to the nitrification reaction chamber. A sludge return branch pipe is fixed on the outer surface of the sludge return main pipe. One end of the sludge return branch pipe passes through the bottom of the nitrification-denitrification tank and is connected to the denitrification reaction chamber.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model involves adding enhanced biological denitrification and microbial activity-enhancing biological agents into multiple annular injection pipes with identical centers. Then, by adding clean water into the annular injection pipes, the water circulates within the pipes, uniformly dissolving the enhanced biological denitrification and microbial activity-enhancing biological agents. The dissolved agents are then uniformly added to the nitrification / denitrification tank, ensuring uniform contact between the agents and the activated sludge. This process increases the number of effective microorganisms in the activated sludge, improves its activity, enhances its settling performance, supplements some carbon sources, strengthens the system's denitrification effect, and maintains the activity of the activated sludge.

[0015] 2. This utility model has multiple baffles distributed on the upper surface of the rotating bottom pipe, and the baffles are arranged in a circular array around the center of the rotating bottom pipe. The inclined water outlet pipe sprays clean water at an angle onto the side of the baffles, so that the baffles drive the rotating bottom pipe and the nozzle to rotate in a circle under the impact of the water flow, thereby ensuring that the biological agents for enhanced biological denitrification and enhanced microbial activity are evenly sprayed on the surface of the activated sludge. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 A schematic diagram of the structure of the biological agent additive component of this utility model;

[0018] Figure 3 This is a cross-sectional schematic diagram of the annular injection tube of this utility model;

[0019] Figure 4 This is a schematic diagram of the branch water pipe of this utility model;

[0020] Figure 5 This is a process flow diagram for the wastewater treatment of this utility model.

[0021] In the diagram: 1. Equalization tank; 2. Nitrification-denitrification tank; 21. Nitrification reaction chamber; 22. Denitrification reaction chamber; 3. First conveying pipe; 4. Second conveying pipe; 5. Main sludge return pipe; 6. Branch sludge return pipe; 7. Biological agent addition component; 71. Annular injection pipe; 72. Feeding hole; 73. Support rod; 74. Connecting rod; 75. Inlet pipe; 76. Rotating bottom pipe; 77. Nozzle; 78. Baffle; 79. Branch water pipe; 791. Straight pipe body; 792. Connecting bend; 793. Inclined outlet pipe; 8. Sludge-water separation system; 9. Nitrification liquid return pipe. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] like Figure 1 As shown, a low-carbon source denitrification system for rural domestic sewage includes an equalization tank 1, a nitrification-denitrification tank 2, and a sludge-water separation system 8. The nitrification-denitrification tank 2 has a nitrification reaction chamber 21 and a denitrification reaction chamber 22 inside. Both the equalization tank 1 and the sludge-water separation system 8 have a first conveying pipe 3 fixed inside. One end of the first conveying pipe 3 connected to the sludge-water separation system 8 penetrates the nitrification-denitrification tank 2 and extends into the denitrification reaction chamber 22. One end of the first conveying pipe 3 connected to the equalization tank 1 penetrates the nitrification-denitrification tank 22. The nitrification tank 2 extends into the inner side of the nitrification reaction chamber 21. A second conveying pipe 4 is fixedly connected between the nitrification reaction chamber 21 and the denitrification reaction chamber 22. A sludge return main pipe 5 is fixed at the bottom of the sludge-water separation system 8. One end of the sludge return main pipe 5 passes through the bottom of the nitrification-denitrification tank 2 and is connected to the nitrification reaction chamber 21. A sludge return branch pipe 6 is fixed on the outer surface of the sludge return main pipe 5. One end of the sludge return branch pipe 6 passes through the bottom of the nitrification-denitrification tank 2 and is connected to the denitrification reaction chamber 22.

[0024] like Figures 2 to 4As shown, a biological agent addition component 7 is installed on the upper surface of the denitrification reaction chamber 22. The biological agent addition component 7 includes multiple concentric annular injection pipes 71 with different diameters and a water inlet pipe 75. Multiple branch water pipes 79 are fixed to the bottom of one end of the water inlet pipe 75. The number of branch water pipes 79 is the same as the number of annular injection pipes 71, and the bottom end of the branch water pipes 79 is inserted into the annular injection pipe 71. A feeding hole 72 is provided on the outer surface of the annular injection pipe 71, and the feeding hole 72 is sealed with a rubber stopper. A rotating bottom pipe 76 is movably installed at the bottom of the annular injection pipe 71. Multiple nozzles 77 are fixed to the bottom of the rotating bottom pipe 76 in a circular array around its center. Multiple baffles 78 are fixed to the upper surface of the rotating bottom pipe 76 in a circular array around its center. Plate 78 is vertically upward and does not contact the inner wall of the annular injection pipe 71. Branch water pipes 79 are fixed on both sides of the rotating bottom pipe 76. The rotating bottom pipe 76 is suspended from the bottom of the annular injection pipe 71 through the branch water pipes 79. Enhanced biological denitrification and microbial activity enhancement biological agents are added into the annular injection pipe 71 through the feed hole 72. Then, water flow is added into the annular injection pipe 71 through the inlet pipe 75 and the branch water pipes 79, so that the water flow rotates and flows between the annular injection pipe 71 and the rotating bottom pipe 76 to uniformly dissolve the enhanced biological denitrification and microbial activity enhancement biological agents. Finally, the dissolved enhanced biological denitrification and microbial activity enhancement biological agents are sprayed onto the surface of the activated sludge inside the denitrification reaction chamber 22 through the nozzle 77 to adjust the activity of the activated sludge.

[0025] Multiple support rods 73 are fixed to the outer side of the outermost annular injection pipe 71. The support rods 73 are bent in an L-shape and fixed to the bottom end of the nitrification-denitrification tank 2. Multiple connecting rods 74 are fixed between two adjacent annular injection pipes 71. The connecting rods 74 are arranged in a circular array around the center of the annular injection pipe 71. The support rods 73 and connecting rods 74 are used to support and fix multiple concentric annular injection pipes 71.

[0026] The branch water pipe 79 includes a straight pipe body 791, a connecting bend 792, and an inclined outlet pipe 793. The top end of the straight pipe body 791 is fixed to the bottom of the inlet pipe 75, and the bottom end of the straight pipe body 791 is inserted into the annular injection pipe 71. The connecting bend 792 is fixed to the bottom end of the straight pipe body 791 and is curved. The inclined outlet pipe 793 is fixed to the bottom end of the connecting bend 792 and is inclined towards the baffle 78. The angle between the inclined outlet pipe 793 and the baffle 78 is 45 degrees. The straight pipe body 791, the connecting bend 792, and the inclined outlet pipe 793 are used to spray clean water obliquely towards the baffle 78, so that the clean water generates a thrust on the baffle 78, and the baffle 78 drives the rotating bottom pipe 76 to rotate at the bottom of the annular injection pipe 71. This causes the nozzle 77 to rotate above the denitrification reaction chamber 22 and evenly spray the biological agent solvent that enhances biological denitrification and microbial activity into the interior of the denitrification reaction chamber 22.

[0027] Working Principle: When treating domestic sewage using a low-carbon source denitrification system, the sewage is first introduced into the equalization tank 1. After treatment in the equalization tank 1, the sewage is introduced into the denitrification reaction chamber 22 through the first conveying pipe 3 connecting the equalization tank 1 and the denitrification reaction chamber 22. In the denitrification reaction chamber 22, the sewage undergoes denitrification by microorganisms in the activated sludge. After the reaction is complete, the nitrified sewage is sent into the nitrification reaction chamber 21 through the second conveying pipe 4. Once in the nitrification reaction chamber 21, the activated sludge inside 21 nitrifies the sewage, converting nitrogenous substances into nitrogen gas for discharge, thus removing nitrogenous pollutants from the sewage. The nitrified liquid in the nitrification reaction chamber 21 can be returned to the denitrification reaction chamber 22 for recycling through the nitrified liquid return pipe.

[0028] During the denitrification reaction in the denitrification reaction chamber 22, a biological agent for enhanced biological denitrification and microbial activity is injected into the annular injection pipe 71 through the feed hole 72. The feed hole 72 is then sealed. Subsequently, external clean water is introduced into the annular injection pipe 71 through the inlet pipe 75 and branch pipes 79. The clean water is sprayed obliquely onto the side of the baffle 78 through the inclined outlet pipe 793, causing the baffle 78 to drive the rotating bottom pipe 76 to rotate around the center of the annular injection pipe 71. This allows the clean water to circulate within the annular injection pipe 71. The biological agent for enhanced biological denitrification and microbial activity is dissolved in clean water. After dissolution, the dissolved biological agent is sprayed into the denitrification reaction chamber 22 by a nozzle 77 that rotates around the center of the annular injection pipe 71 with the rotating bottom pipe 76. The biological agent increases the number of effective microorganisms in the activated sludge, improves the activity of the activated sludge, improves the sludge settling performance, and supplements some carbon sources, thereby enhancing the denitrification effect of the system.

[0029] The enhanced biological denitrification and microbial activity-enhancing biological agents used in this embodiment are denitrification microbial agents with better effects developed by the applicant. The applicant's previously developed NHNS bacterial agent includes 5 kg of bacterial agent A, 1 kg of bacterial agent B, and 5 kg of nutrient carrier. Bacterial agent A is mixed according to the following composition: 0.5 kg of Nitrospira, 0.5 kg of Nitrospira nitrifying, 0.5 kg of Nitrobacterium velutipes, 2 kg of Bacillus, 0.5 kg of Trichomonas spp. (selected from Trichomonas velutipes, the same below), 0.5 kg of Rawstone's spp. (selected from Rawstone's eutrophic, the same below), and 0.5 kg of Shortwave's spp. (selected from Shortwave's deficient, the same below). Bacterial agent B is mixed according to the following composition: 0.25 kg of Candida albicans, 0.25 kg of white-rot fungi, and 0.5 kg of Coccidioidomyces. The nutrient carrier is mixed according to the following composition: 20 parts polyhydroxyalkane, 20 parts mica, 35 parts starch, 5 parts potassium dihydrogen phosphate, 1 part biotin, 1 part folic acid, 0.5 parts vitamin B12, 0.5 parts pantothenic acid, 0.5 parts niacin, and 0.2 parts riboflavin.

[0030] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A low-carbon source denitrification system for rural domestic sewage, comprising a regulating tank (1), a nitrification-denitrification tank (2) and a sludge-water separation system (8), characterized in that: The inner side of the nitrification-denitrification tank (2) is provided with a nitrification reaction bin (21) and a denitrification reaction bin (22), the upper side of the denitrification reaction bin (22) is provided with a biological agent adding component (7), the biological agent adding component (7) comprises a plurality of annular injection pipes (71) with different diameters and one water inlet pipe (75), the bottom of one end of the water inlet pipe (75) is fixedly provided with a plurality of branch water pipes (79), the number of the branch water pipes (79) is consistent with the number of the annular injection pipes (71), the bottom end of the branch water pipe (79) is inserted into the annular injection pipe (71), the outer surface of the annular injection pipe (71) is provided with a feeding hole (72), the feeding hole (72) is blocked by a rubber plug, the bottom of the annular injection pipe (71) is movably provided with a rotating bottom pipe (76), the bottom of the rotating bottom pipe (76) is fixedly provided with a plurality of nozzles (77) which are circularly arranged around the center of the rotating bottom pipe (76), the upper surface of the rotating bottom pipe (76) is fixedly provided with a plurality of baffles (78) which are circularly arranged around the center of the rotating bottom pipe (76), the baffles (78) vertically upward and do not contact with the inner wall of the annular injection pipe (71), the two sides of the rotating bottom pipe (76) are fixedly provided with the branch water pipes (79), the rotating bottom pipe (76) is hung on the bottom of the annular injection pipe (71) through the branch water pipes (79).

2. The low-carbon source denitrification system for rural domestic sewage according to claim 1, characterized in that: The outer side of the annular injection pipe (71) located in the outermost circle is fixedly provided with a plurality of supporting rods (73), one end of the supporting rod (73) is L-shaped and the bottom end is fixed to the upper surface of the nitrification-denitrification tank (2).

3. The low-carbon source nitrogen removal system for rural domestic sewage according to claim 2, characterized in that: The inner and outer adjacent two annular injection pipes (71) and the annular injection pipes (71) are fixedly provided with a plurality of connecting rods (74), the connecting rods (74) are circularly arranged around the center of the annular injection pipe (71).

4. The low carbon source denitrification system for rural domestic sewage according to claim 1, characterized in that: The branch water pipe (79) comprises a straight pipe body (791), a connecting elbow pipe (792) and an inclined water outlet pipe (793), the top end of the straight pipe body (791) is fixed to the bottom of the water inlet pipe (75), the bottom end of the straight pipe body (791) is inserted into the annular injection pipe (71).

5. The low carbon source denitrification system for rural domestic sewage according to claim 4, characterized in that: The connecting elbow pipe (792) is fixed to the bottom end of the straight pipe body (791) and is arc-shaped, the inclined water outlet pipe (793) is fixed to the bottom end of the connecting elbow pipe (792) and is inclined to the baffle (78), the included angle between the inclined water outlet pipe (793) and the baffle (78) is forty-five degrees.

6. The low carbon source denitrification system for rural domestic sewage according to claim 1, characterized in that: The inside of the adjusting tank (1) and the sludge-water separation system (8) is fixedly provided with a first conveying pipe (3), one end of the first conveying pipe (3) connected to the sludge-water separation system (8) penetrates through the nitrification-denitrification tank (2) and extends to the inside of the denitrification reaction bin (22), one end of the first conveying pipe (3) connected to the adjusting tank (1) penetrates through the nitrification-denitrification tank (2) and extends to the inside of the nitrification reaction bin (21).

7. The low carbon source denitrification system for rural domestic sewage according to claim 6, characterized in that: The second conveying pipe (4) is fixedly connected between the nitrification reaction bin (21) and the nitrification reaction bin (22), the bottom of the sludge-water separation system (8) is fixed with a sludge backflow main pipeline (5), one end of the sludge backflow main pipeline (5) penetrates through the bottom of the nitrification-denitrification tank (2) and communicates with the nitrification reaction bin (21), the outer surface of the sludge backflow main pipeline (5) is fixed with a sludge backflow branch pipeline (6), and one end of the sludge backflow branch pipeline (6) penetrates through the bottom of the nitrification-denitrification tank (2) and communicates with the denitrification reaction bin (22).

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