Pilot plant for enhancing tail water denitrification through cooperation of film-forming inoculant and slow-release carbon

Abstract

The utility model provides a pilot plant for enhancing tail water denitrification through cooperation of a film-forming fungicide and slow-release carbon, and belongs to the technical field of denitrification devices. Comprising a reaction tank and a sedimentation tank which are communicated with each other, one side of the reaction tank is connected with an oxygen supply device, and the lower part of the reaction tank is provided with a water inlet; a first base is arranged at the bottom of the reaction tank, a power device is arranged in the first base, the power device is connected with the water inlet through a connecting pipe, and a second base is arranged at the bottom of the sedimentation tank; a stirring device is arranged in the reaction tank, a first water outlet is formed in one side, far away from the reaction tank, of the sedimentation tank, a second water outlet is formed in the bottom of the sedimentation tank, and the second water outlet is connected with the connecting pipe. According to the utility model, the stability of functional bacteria in the system can be well maintained, and the denitrification effect is improved; the operation process is simple, the manufacturing cost is low, and automatic operation can be achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of denitrification devices, and specifically relates to a pilot plant for strengthening tail water denitrification by using a film-forming bacterial agent in coordination with slow-release carbon. Background Art

[0002] The increase in nitrate concentrations in surface water has become a pressing environmental issue because they can cause eutrophication and associated harmful algal blooms, hypoxia and fish kills, with adverse effects on water quality and ecosystem functions. Wastewater treatment is a major solution to reduce point source water pollution. However, the amount of nitrogen that can be removed by sewage treatment plants is relatively low, accounting for a small part of the total nitrogen in urban sewage, and the average nitrogen removal rate is relatively low. Effective measures must be taken to further improve the denitrification efficiency.

[0003] However, traditional technologies face problems such as high cost, secondary pollution and scale limitation in dealing with nitrogen pollution, which prompts us to continuously explore new methods or continuously improve traditional methods to meet the needs of social development. Aerobic denitrification technology is a new type of biological denitrification technology. It gets rid of the disadvantage of traditional biological denitrification that nitrification and denitrification processes need to be carried out in independent reaction zones. It can realize nitrification and denitrification in the same time and space, reducing the input cost, and has the application advantage of further denitrification of nitrogen in sewage treatment plants. Utility Model Content

[0004] The purpose of the utility model is to provide a pilot plant for strengthening tail water denitrification by using a film-forming bacterial agent in collaboration with slow-release carbon. The technical problem to be solved is to provide a device that can well maintain the stability of functional bacteria in the system and improve the denitrification effect; the operation process is simple, the construction cost is low, and automatic operation can be achieved.

[0005] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0006] A pilot plant for strengthening tailwater denitrification by using a film-forming bacterial agent in collaboration with slow-release carbon comprises a reaction tank and a sedimentation tank, wherein the sedimentation tank and the reaction tank are interconnected; an oxygen supply device is connected to one side of the reaction tank, and a water inlet is arranged at the lower part of the reaction tank; a first base is arranged at the bottom of the reaction tank, and a second base is arranged at the bottom of the sedimentation tank; a power device is arranged in the first base, and the power device is connected to the water inlet through a connecting pipe;

[0007] A stirring device is arranged in the reaction tank, a first water outlet is arranged on a side of the sedimentation tank away from the reaction tank, a second water outlet is arranged at the bottom of the sedimentation tank, and the second water outlet is connected to a connecting pipe.

[0008] Furthermore, the water inlet comprises a sewage inlet and a return water inlet, and both the sewage inlet and the return water inlet are connected to the reaction tank.

[0009] Furthermore, the stirring device includes a stirring blade and a stirring motor, the stirring blade is arranged inside the reaction tank, the stirring motor is arranged on the top of the reaction tank, and the stirring motor is connected to the upper part of the stirring blade.

[0010] Furthermore, the oxygen supply device comprises an air pump and an aeration plate, the aeration plate is arranged in the reaction tank, the aeration plate is arranged below the stirring blade, and the air pump is connected to the aeration plate.

[0011] Furthermore, the connecting pipe includes a sewage inlet pipe and a return water inlet pipe, the sewage inlet pipe is connected to the sewage inlet, and the return water inlet pipe is respectively connected to the return water inlet and the second outlet.

[0012] Furthermore, the power device includes an electrical control box, an inlet peristaltic motor and a return peristaltic motor, the electrical control box is connected to the inlet peristaltic motor and the return peristaltic motor; the inlet peristaltic motor is connected to the sewage inlet pipe, and the return peristaltic motor is connected to the return water inlet pipe.

[0013] Furthermore, a pool cover is arranged on the top of the reaction pool, and a handle is arranged on the pool cover; a plurality of buckles are arranged on the outer wall of the reaction pool near the top, and a hook part cooperating with the plurality of buckles is arranged on the outer periphery of the pool cover.

[0014] Furthermore, the reaction tank and the sedimentation tank are connected through a water pipe.

[0015] Furthermore, the second water outlet is arranged in the second base.

[0016] The beneficial technical effects achieved by the utility model are:

[0017] 1. By setting a second water outlet at the bottom of the sedimentation tank, the aerobic denitrification strains precipitated at the bottom of the sedimentation tank are recovered and re-introduced into the reaction tank, which can be recycled to avoid the loss of strains during the treatment process, improve the utilization efficiency of the strains, save the amount of strains, maintain the denitrification stability of the system for a long time, and well maintain the stability of the functional bacteria in the system;

[0018] 2. By setting a stirring device in the reaction tank, the strains colonized on the solid slow-release carbon source at the bottom can be stirred so that the release of the solid slow-release carbon source is not affected, and the solid slow-release carbon source can be continuously and stably released, and the carbon source is fully utilized by the strains; the combination of the strains and the solid slow-release carbon source can significantly improve the denitrification effect of the strains;

[0019] 3. By only setting up a reaction tank and a sedimentation tank, and setting up a power device in the base of the reaction tank, compared with the traditional denitrification device, the utility model has a simple operation process, low construction cost, and can realize automatic operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of a pilot plant for enhancing tailwater denitrification by using a film-forming bacterial agent in conjunction with slow-release carbon in the utility model;

[0021] Figure 2 This is a front view of a pilot plant for enhancing tailwater denitrification by using a film-forming bacterial agent in coordination with slow-release carbon according to the utility model;

[0022] Figure 3 It is a top view of a pilot plant for enhancing tailwater denitrification by using a film-forming bacterial agent in coordination with slow-release carbon according to the utility model;

[0023] Figure 4 It is a schematic diagram of the internal structure of a reaction tank of a pilot plant for strengthening tailwater denitrification by using a film-forming bacterial agent in cooperation with slow-release carbon according to the utility model;

[0024] Figure 5 This is a relationship diagram between the nitric nitrogen removal rate and the nitric nitrogen concentration in the inlet and outlet water after the device of the utility model has been running for half a month;

[0025] Figure 6 This is a relationship diagram of TIN removal rate, influent TN (total nitrogen) and effluent TIN (total soluble nitrogen) concentration after the device of the utility model has been running for half a month;

[0026] Figure 7 This is a graph showing the relationship between the concentrations of ammonia nitrogen and nitrite nitrogen in the effluent after the device of the utility model has been running for half a month;

[0027] In the figure:

[0028] 1. Reaction tank; 2. Stirring motor; 3. Water pipe; 4. First water outlet; 5. Sedimentation tank; 6. Second base; 7. Reflux peristaltic motor; 8. Inlet peristaltic motor; 9. Electric control box; 10. Air pump; 11. Buckle; 12. Handle; 13. Second water outlet; 14. First base; 15. Reflux water inlet; 16. Sewage inlet; 17. Stirring blades; 18. Aeration plate. DETAILED DESCRIPTION

[0029] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] Embodiment 1:

[0032] like Figures 1 to 3 As shown, the utility model provides a pilot plant for strengthening tailwater denitrification by film-forming bacteria and slow-release carbon, comprising a reaction tank 1 and a sedimentation tank 5, wherein the sedimentation tank 5 is interconnected with the reaction tank 1; an oxygen supply device is connected to one side of the reaction tank 1, and a water inlet is arranged at the lower part of the reaction tank 1; a first base 14 is arranged at the bottom of the reaction tank 1, and a second base 6 is arranged at the bottom of the sedimentation tank 5; a power device is arranged in the first base 14, and the power device is connected to the water inlet through a connecting pipe;

[0033] The reaction tank 1 is provided with a stirring device, the sedimentation tank 5 is provided with a first water outlet 4 on a side away from the reaction tank 1, and a second water outlet 13 is provided at the bottom of the sedimentation tank, and the second water outlet 13 is connected to a connecting pipe.

[0034] Embodiment 2:

[0035] like Figures 1 to 3 As shown, the utility model provides a pilot plant for strengthening tailwater denitrification by film-forming bacteria and slow-release carbon, comprising a reaction tank 1 and a sedimentation tank 5, wherein the sedimentation tank 5 is interconnected with the reaction tank 1; an oxygen supply device is connected to one side of the reaction tank 1, and a water inlet is arranged at the lower part of the reaction tank 1; a first base 14 is arranged at the bottom of the reaction tank 1, and a second base 6 is arranged at the bottom of the sedimentation tank 5; a power device is arranged in the first base 14, and the power device is connected to the water inlet through a connecting pipe;

[0036] The reaction tank 1 is provided with a stirring device, the sedimentation tank 5 is provided with a first water outlet 4 on a side away from the reaction tank, and a second water outlet 13 is provided at the bottom of the sedimentation tank, and the second water outlet 13 is connected to a connecting pipe.

[0037] The difference between this embodiment and embodiment 1 is that:

[0038] like Figures 1 to 3As shown, the reaction tank 1 and the sedimentation tank 5 are connected by a water pipe 3; the second water outlet 13 is arranged in the second base 6; the water inlet includes a sewage inlet 16 and a return water inlet 15, and the sewage inlet 16 and the return water inlet 15 are both connected to the reaction tank 1; the connecting pipe includes a sewage inlet pipe and a return water inlet pipe, the sewage inlet pipe is connected to the sewage inlet 16, and the return water inlet pipe is respectively connected to the return water inlet 15 and the second water outlet 13;

[0039] The power device includes an electric control box 9, an inlet peristaltic motor 8 and a reflux peristaltic motor 7, wherein the electric control box 9 is connected to the inlet peristaltic motor 8 and the reflux peristaltic motor 7; the inlet peristaltic motor 8 is connected to the sewage inlet pipe, the reflux peristaltic motor 7 is connected to the reflux water inlet pipe, and both ends of the reflux water inlet pipe are respectively connected to the second water outlet 13 and the reflux water inlet 15, and the reflux peristaltic motor 7 can make the strains precipitated at the bottom of the sedimentation tank 5 flow into the reaction tank 1 from the reflux water inlet pipe from the reflux water inlet 15;

[0040] like Figure 1 and Figure 4 As shown, the stirring device includes a stirring blade 17 and a stirring motor 2, wherein the stirring blade 17 is arranged inside the reaction tank 1, and the stirring motor 2 is arranged at the top of the reaction tank 1, and the stirring motor 2 is connected to the upper part of the stirring blade 17, and can drive the stirring blade to rotate; the oxygen supply device includes an air pump 10 and an aeration disk 18, wherein the aeration disk 18 is arranged in the reaction tank 1, and the aeration disk 18 is arranged below the stirring blade 17, and the air pump 10 is connected to the aeration disk 18 to provide oxygen for the reaction tank, so that the strain performs aerobic denitrification;

[0041] like Figure 1 As shown, a pool cover is arranged on the top of the reaction pool 1, and a handle 12 is arranged on the pool cover; a plurality of buckles 11 are arranged on the outer wall of the reaction pool 1 near the top, and a hook part matched with the plurality of buckles 11 is arranged on the outer periphery of the pool cover; when it is necessary to add polypropylene balls, solid slow-release carbon source and aerobic denitrifying bacteria into the reaction pool 1, the cooperation between the buckle 11 and the hook part is released, and the handle 12 is pulled to open the pool cover. After the addition is completed, the buckle 11 and the hook part are matched with each other to fix the pool cover.

[0042] Embodiment 3:

[0043] In this example, the data of the device running for half a month shows that when the average nitrate nitrogen concentration of the inlet water is 6.7 mg / L, the average nitrate nitrogen concentration of the outlet water is 0.6 mg / L, and the removal rate is as high as 91.2% ( Figure 5); When the average total nitrogen concentration of the influent is 7.4 mg / L, the soluble total nitrogen concentration of the effluent is 1.7 mg / L, and the removal rate reaches 75.8% ( Figure 6 ); the average concentrations of ammonia nitrogen and nitrite nitrogen in the effluent were 0.01 and 0.06 mg / L, respectively, and the enrichment amount was relatively small ( Figure 7 ).

[0044] The utility model discloses a pilot plant for strengthening tail water denitrification by using a film-forming bacterial agent in coordination with slow-release carbon, and the working process is as follows:

[0045] like Figures 1 to 4 As shown, a certain amount of polypropylene beads, solid slow-release carbon source and aerobic denitrification strains are added to the reaction tank 1. The strain has a rapid film-forming property, and the polypropylene carrier ball can be used as a carrier for its attachment, thereby increasing the colonization abundance of the strain and reducing the loss of the strain. At the same time, the strain can perform a stable aerobic denitrification reaction in a low carbon-nitrogen ratio and aerobic environment. The reaction process is that NO-3 is reduced to NO-2 under the action of nitrate reductase (Nap); then NO-2 is reduced to NO under the action of nitrite reductase (Nir); then it is reduced to N2O under the action of nitric oxide reductase (Nor); finally, N2O is reduced to N2 under the action of nitrous oxide reductase;

[0046] The sewage is continuously fed into the reaction tank 1 at a certain flow rate through the water inlet peristaltic motor 8, and the air pump 10 is connected to the aeration plate 18 to provide oxygen for the reaction tank 1, so that the strain can perform aerobic denitrification, and the nitrate ion, the main nitrogen component in the sewage, is reduced to a non-toxic gas N2. The strain needs a sufficient amount of carbon source and nitrogen source when performing aerobic denitrification. The sewage contains nitrogen source and carbon source, but the carbon source contained is not enough to support the continuation of aerobic denitrification, and the input solid slow-release carbon source can make up for the problem of insufficient carbon source; the stirring motor 2 is connected to the stirring blade 17, and the stirring blade 17 is driven to rotate to stir the strain colonized on the solid slow-release carbon source at the bottom, so that it does not affect the release of the solid slow-release carbon source, so that the strain can sustainably perform aerobic denitrification;

[0047] The treated sewage enters the sedimentation tank 5. Under the action of gravity, some strains in the water are precipitated at the bottom of the sedimentation tank 5 and discharged through the second water outlet 13. Then, through the reflux peristaltic motor 7, it enters the reaction tank 1 from the reflux water inlet 15, thereby realizing the recycling of strains, avoiding the loss of strains during the treatment process, improving the utilization efficiency of strains, saving the amount of strains, and being able to maintain the denitrification stability of the system for a long time, and well maintaining the stability of the functional bacteria in the system; the treated water is discharged from the device through the first water outlet 4.

[0048] The parts of the present invention that are not described in detail are prior art, and their internal structures will not be described one by one here.

[0049] The above implementation is only to illustrate the technical concept and features of the utility model, and its purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly, and it cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A pilot plant for strengthening tailwater denitrification by using a film-forming bacterial agent in conjunction with slow-release carbon, characterized in that: It comprises a reaction tank and a sedimentation tank, wherein the sedimentation tank and the reaction tank are interconnected; an oxygen supply device is connected to one side of the reaction tank, and a water inlet is arranged at the lower part of the reaction tank; a first base is arranged at the bottom of the reaction tank, and a second base is arranged at the bottom of the sedimentation tank; a power device is arranged in the first base, and the power device is connected to the water inlet through a connecting pipe; A stirring device is arranged in the reaction tank, a first water outlet is arranged on a side of the sedimentation tank away from the reaction tank, a second water outlet is arranged at the bottom of the sedimentation tank, and the second water outlet is connected to a connecting pipe.

2. The pilot plant for enhancing tailwater denitrification by using a film-forming bacterial agent in collaboration with slow-release carbon according to claim 1, characterized in that: The second water outlet is arranged in the second base.

3. The pilot plant for enhancing tailwater denitrification by using a film-forming bacterial agent in collaboration with slow-release carbon according to claim 1, characterized in that: The water inlet comprises a sewage inlet and a return water inlet, and both the sewage inlet and the return water inlet are connected to the reaction tank.

4. A pilot plant for enhancing tailwater denitrification by using a film-forming bacterial agent in collaboration with slow-release carbon according to claim 3, characterized in that: The connecting pipe comprises a sewage inlet pipe and a return water inlet pipe, the sewage inlet pipe is connected to the sewage inlet, and the return water inlet pipe is respectively connected to the return water inlet and the second outlet.

5. The pilot plant for enhancing tailwater denitrification by using a film-forming bacterial agent in collaboration with slow-release carbon according to claim 4, characterized in that: The power device includes an electric control box, a water inlet peristaltic motor and a return flow peristaltic motor. The electric control box is connected to the water inlet peristaltic motor and the return flow peristaltic motor; the water inlet peristaltic motor is connected to the sewage inlet pipe, and the return flow peristaltic motor is connected to the return water inlet pipe.

6. The pilot plant for enhancing tailwater denitrification by using a film-forming bacterial agent in collaboration with slow-release carbon according to claim 1, characterized in that: The stirring device comprises a stirring blade and a stirring motor. The stirring blade is arranged inside the reaction tank, and the stirring motor is arranged on the top of the reaction tank. The stirring motor is connected to the upper part of the stirring blade.

7. A pilot plant for enhancing tailwater denitrification by using a film-forming bacterial agent in collaboration with slow-release carbon according to claim 6, characterized in that: The oxygen supply device comprises an air pump and an aeration plate, wherein the aeration plate is arranged in the reaction tank, the aeration plate is arranged below the stirring blade, and the air pump is connected to the aeration plate.

8. The pilot plant for enhancing tailwater denitrification by using a film-forming bacterial agent in collaboration with slow-release carbon according to claim 1, characterized in that: A pool cover is arranged on the top of the reaction pool, and a handle is arranged on the pool cover; a plurality of buckles are arranged on the outer wall of the reaction pool near the top, and a hook part matching with the plurality of buckles is arranged on the outer periphery of the pool cover.

9. A pilot plant for enhancing tailwater denitrification by using any one of the film-forming bacteria agents in conjunction with slow-release carbon according to claims 1-8, characterized in that: The reaction tank and the sedimentation tank are connected via a water pipe.

Images