Efficient denitrification system for treating ammonia-nitrogen wastewater

Abstract

The utility model discloses an efficient denitrification system for treating ammonia-nitrogen wastewater, which comprises an anaerobic zone, a short-cut nitrification zone, a denitrification zone and an effluent settling zone which are sequentially connected, and a partition plate is arranged between every two adjacent reaction zones; an overflow port is formed in the upper part of the partition plate; the anaerobic zone is filled with a first filler; the denitrification area is filled with a second filler; a separation baffling groove is formed in the short-cut nitrification area; the separation baffling tank is vertically arranged on a partition plate between the short-cut nitrification zone and the denitrification zone; an effluent baffling groove is formed in the denitrification area; and the effluent baffling tank is vertically arranged on the partition plate between the denitrification area and the effluent settling area. The ammonia-nitrogen wastewater treatment device can effectively treat ammonia-nitrogen wastewater, and is high in treatment efficiency and good in denitrification effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of wastewater treatment, and particularly relates to an efficient denitrification system for treating ammonia nitrogen wastewater. Background Technique

[0002] Ammonia nitrogen wastewater mainly comes from industrial wastewater, domestic sewage and agricultural non-point source pollution. The ammonia nitrogen in ammonia nitrogen wastewater exists in the forms of free ammonia and ionic ammonium, and has high toxicity and biological availability. Excessive ammonia nitrogen will cause the water body to turn black and emit a stench, reduce the water quality, and affect the survival of aquatic organisms. In addition, ammonia nitrogen is also one of the important inducements for water eutrophication, which may cause a large number of algae to reproduce, resulting in water hypoxia and ecological system imbalance. Due to the oxidation of NH 3 -N in ammonia nitrogen wastewater, a large amount of dissolved oxygen will be consumed, resulting in a decrease in the dissolved oxygen concentration of the water body, affecting the respiration and metabolism of aquatic organisms. And excessive ammonia nitrogen will cause water eutrophication, promote the large reproduction of algae, and form the phenomenon of "water bloom". This will not only destroy the ecological balance of the water body, but also may affect the utilization value of water resources. In addition, the toxic substances in ammonia nitrogen wastewater will have a toxic effect on aquatic organisms and damage the structure and function of the aquatic ecosystem. At the same time, ammonia nitrogen wastewater may also enter the soil and groundwater systems through surface runoff and groundwater and other channels, causing pollution to the soil and groundwater.

[0003] There are the following problems in the treatment of ammonia nitrogen wastewater: 1. The ammonia nitrogen in ammonia nitrogen wastewater usually exists in various forms such as organic nitrogen, ammonia nitrogen, nitrate nitrogen and nitrite nitrogen, and its treatment is relatively difficult. At the same time, ammonia nitrogen wastewater from different sources has different water quality characteristics and treatment requirements, and different treatment technologies and processes need to be adopted. 2. High treatment cost: The treatment of ammonia nitrogen wastewater requires a large amount of energy and chemicals, and the treatment cost is relatively high. In addition, due to the relatively difficult treatment of ammonia nitrogen wastewater, efficient and economical treatment technologies need to be adopted to reduce the treatment cost. 3. Unstable treatment effect: Traditional ammonia nitrogen wastewater treatment technologies such as biological methods, physical methods and chemical methods are easily affected by environmental factors during the treatment process, resulting in unstable treatment effects.

[0004] In the prior art, biological denitrification is environmentally friendly and has no secondary pollution, and is an effective method for treating ammonia nitrogen wastewater. Among them, new biological denitrification technologies such as short-cut nitrification, denitrification and anaerobic ammonia oxidation have become popular choices. However, in the current ammonia nitrogen wastewater treatment system, there are problems of low efficiency of microbial interception and treatment, serious loss of activated sludge and short-circuit phenomenon, which greatly affect the treatment effect of ammonia nitrogen wastewater. Content of the Utility Model

[0005] The purpose of the utility model is to provide an efficient denitrification system for treating ammonia nitrogen wastewater to solve the technical problems proposed in the above background technique.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] An efficient denitrification system for treating ammonia nitrogen wastewater, comprising an anaerobic zone, a short-cut nitrification zone, a denitrification zone, and an effluent sedimentation zone. The anaerobic zone, the short-cut nitrification zone, the denitrification zone, and the effluent sedimentation zone are connected in sequence, and a partition board is provided between adjacent reaction zones; an overflow port is provided at the upper part of the partition board; a first filler is filled in the anaerobic zone; a second filler is filled in the denitrification zone; a separation baffle trough is provided in the short-cut nitrification zone; the separation baffle trough is vertically arranged on the partition board between the short-cut nitrification zone and the denitrification zone; an effluent baffle trough is provided in the denitrification zone; the effluent baffle trough is vertically arranged on the partition board between the denitrification zone and the effluent sedimentation zone.

[0008] Further, the first filler is hollow polypropylene PP with a diameter of 3 inches, and multi-faceted hollow balls are filled inside; the second filler is hollow polypropylene PP with a diameter of 1 inch, and modified polyurethane is filled inside.

[0009] Further, the application filling rate of the first filler is 40 - 70%; the application filling rate of the second filler is 25 - 40%.

[0010] Further, the bottom surface of the separation baffle trough is spaced 20 - 40 cm from the bottom surface of the short-cut nitrification zone, and the inner wall of the separation baffle trough is spaced 10 - 30 cm from the partition board.

[0011] Further, the bottom surface of the effluent baffle trough is spaced 40 - 60 cm from the bottom surface of the denitrification zone, and the inner wall of the effluent baffle trough is spaced 10 - 30 cm from the partition board.

[0012] Further, a round hole plate is provided at the bottom of the effluent baffle trough; the round hole plate forms an angle of 10 - 30° with the partition board.

[0013] Further, the effluent sedimentation zone is connected to the denitrification zone through a pipeline.

[0014] Further, sludge discharge ports are provided at the bottoms of the anaerobic zone, the short-cut nitrification zone, the denitrification zone, and the effluent sedimentation zone.

[0015] Further, the volume ratio of the anaerobic zone, the short-cut nitrification zone, the denitrification zone, and the effluent sedimentation zone is 1 - 3:1:1 - 3:1.

[0016] The beneficial effects of the utility model compared with the prior art are as follows:

[0017] 1. In the anaerobic zone of the present utility model, the first filler is filled, which can promote the interception of anaerobic microorganisms, improve the sewage treatment efficiency, enhance the removal of COD, and effectively strengthen the denitrification effect of nitrogen removal; in the denitrification zone, the second filler is filled, which is beneficial to the interception and growth of anaerobic ammonium oxidation bacteria, and the combined structure of the second filler can enhance the shock resistance of the bacteria, avoid the short-term poisoning, swelling, deflocculation and loss of granular sludge. At the same time, the small-sized polypropylene PP spherical shell will not affect the suspension effect of the filler and can also prevent the bacteria from rubbing off each other in the aeration suspension state.

[0018] 2. In the present utility model, a separation baffle trough is arranged in the short-cut nitrification zone, which can effectively separate the activated sludge from the water and reduce the loss of activated sludge in the short-cut nitrification zone; an effluent baffle trough is arranged in the denitrification zone to avoid the short-circuit phenomenon and prevent the loss of filler bacteria at the same time.

[0019] 3. The effluent sedimentation zone of the present utility model is connected to the anaerobic zone through a pipeline to form a reflux, which can adjust the reflux flow according to the effluent situation, and timely return the excessive nitrate nitrogen and residual nitrite nitrogen in the effluent to the anaerobic zone for removal through the denitrification effect.

[0020] 4. The present utility model can adjust the volume of the anaerobic zone or the denitrification zone according to the different contents in the wastewater, making the treatment effect more targeted and improving the treatment effect. Description of the Drawings

[0021] Figure 1 is the structural schematic diagram of the present utility model;

[0022] Figure 2 is the connection flow chart of each reaction zone of the present utility model;

[0023] Figure 3 is the front view of the effluent baffle trough of the present utility model;

[0024] Figure 4 is the connection structural schematic diagram of the effluent baffle trough and the partition board of the present utility model.

[0025] In the drawings, 1. Anaerobic zone; 11. First filler; 2. Short-cut nitrification zone; 3. Denitrification zone; 31. Second filler; 4. Effluent sedimentation zone; 5. Partition board; 51. Overflow port; 6. Separation baffle trough; 7. Effluent baffle trough; 71. Round hole plate; 8. Sludge discharge port. Detailed Embodiment

[0026] To make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the following preferred embodiments are cited with reference to the accompanying drawings for a further detailed description of the present utility model. However, it should be noted that many details listed in the specification are only for enabling the reader to have a thorough understanding of one or more aspects of the present utility model, and these aspects of the present utility model can be implemented even without these specific details.

[0027] As Figures 1-4 shown, a high-efficiency denitrification system for treating ammonia nitrogen wastewater includes four reaction zones: an anaerobic zone 1, a shortcut nitrification zone 2, a denitrification zone 3, and an effluent sedimentation zone 4. The anaerobic zone 1, the shortcut nitrification zone 2, the denitrification zone 3, and the effluent sedimentation zone 4 are connected in sequence, and a partition 5 is provided between adjacent reaction zones; an overflow port 51 is provided in the upper part of the partition 5; wastewater enters the bottom of the anaerobic zone 1 and overflows to the shortcut nitrification zone 2, the denitrification zone 3, and the effluent sedimentation zone 4 in sequence to complete the denitrification of the wastewater; an inlet is provided in the lower left part of the anaerobic zone 1, which is inoculated with activated sludge and filled with a first filler 11 for promoting the interception of anaerobic microorganisms; the denitrification zone 3 is filled with a second filler 31 and inoculated with domesticated anaerobic ammonium oxidation bacteria for promoting the interception and growth of anaerobic ammonium oxidation bacteria; the shortcut nitrification zone 2 is inoculated with activated sludge and is provided with a separation baffle trough 6; the separation baffle trough 6 is vertically arranged on the partition 5 between the shortcut nitrification zone 2 and the denitrification zone 3 for separating activated sludge and water and reducing the loss of activated sludge in the shortcut nitrification zone 2; an effluent baffle trough 7 is provided in the denitrification zone 3; the effluent baffle trough 7 is vertically arranged on the partition 5 between the denitrification zone 3 and the effluent sedimentation zone 4 for preventing short-circuit flow and preventing the loss of filler bacteria.

[0028] The first filler 11 is hollow polypropylene PP with a diameter of 3 inches, and multi-faceted hollow balls are filled inside; it can promote the interception of anaerobic microorganisms, improve the treatment efficiency of sewage, such as COD and denitrification by denitrification. The second filler 31 is hollow polypropylene PP with a diameter of 1 inch, and modified polyurethane is filled inside; it can enhance the shock resistance of the bacteria, avoid the problem of short-term poisoning, swelling, deflocculation and loss of granular sludge; add small-sized polypropylene PP spherical shells, which does not affect the suspension effect of the filler and avoids the mutual friction and shedding of the bacteria in the aerated suspension state.

[0029] The application filling rate of the first filler 11 is 40-70%; the application filling rate of the second filler 31 is 25-40%.

[0030] The bottom surface of the separation baffle trough 6 is spaced 20-40 cm from the bottom surface of the shortcut nitrification zone 2, and the interval between its inner wall and the partition 5 is 10-30 cm.

[0031] The bottom surface of the effluent baffle tank 7 is spaced 40 - 60 cm from the bottom surface of the denitrification zone 3, and the space between its inner wall and the partition plate 5 is 10 - 30 cm.

[0032] A round hole plate 71 is provided at the bottom of the effluent baffle tank 7, and the diameter of the round hole is 2.8 cm; the round hole plate 71 forms an angle of 10 - 30° with the partition plate 5.

[0033] The effluent sedimentation zone 4 is connected to the denitrification zone 3 through pipelines to form a circulating reflux, which can reflux the excessive nitrate nitrogen and residual nitrite nitrogen in the water to the anaerobic zone 1 for removal through denitrification.

[0034] Sludge discharge ports 8 are provided at the bottoms of the anaerobic zone 1, the shortcut nitrification zone 2, the denitrification zone 3, and the effluent sedimentation zone 4. The sludge discharge ports 8 are connected to sludge pumps through pipelines, and electromagnetic valves are provided on the pipelines of each sludge discharge port 8. The sludge pumps and the electromagnetic valves are connected to the PLC control system.

[0035] The volume ratios of the anaerobic zone 1, the shortcut nitrification zone 2, the denitrification zone 3, and the effluent sedimentation zone 4 are 1 - 3:1:1 - 3:1. The volume ratios are adjusted according to the different COD and nitrogen concentrations and ratios in the influent. When the COD concentration in the wastewater is relatively high, the volume of the anaerobic zone 1 is appropriately increased; when the incoming ammonia nitrogen is high and the COD is low, the volume of the denitrification zone 3 is appropriately increased.

[0036] It also includes a detection and regulation system for detecting and regulating DO. This detection and regulation system is connected to the PLC control system and can on - line monitor and automatically regulate the DO in the shortcut nitrification zone 2 and the denitrification zone 3 to ensure the efficient operation of the denitrification system in the shortcut nitrification zone 2 and the denitrification zone 3.

[0037] Example 1

[0038] This example is used to treat the biogas slurry of aquaculture wastewater, and its water quality indicators are shown in Table 1.

[0039] An efficient denitrification system for treating ammonia-nitrogen wastewater, comprising four reaction zones: an anaerobic zone 1, a shortcut nitrification zone 2, a denitrification zone 3, and an effluent sedimentation zone 4. The volume ratio of the anaerobic zone 1, the shortcut nitrification zone 2, the denitrification zone 3, and the effluent sedimentation zone 4 is 2:1:2:1. The anaerobic zone 1, the shortcut nitrification zone 2, the denitrification zone 3, and the effluent sedimentation zone 4 are connected in sequence, and a partition 5 is provided between adjacent reaction zones; the effluent sedimentation zone 4 is connected to the denitrification zone 3 by a pipeline to form a circulating reflux, and the regulation range of the reflux flow rate is 300%. An overflow port 51 is provided on the upper part of the partition 5; The anaerobic zone 1 is inoculated with activated sludge with a concentration of 3500-5000 mg / L and filled with a first filler 11. The application filling rate of the first filler 11 is 70%. The first filler 11 is hollow polypropylene PP with a diameter of 3 inches, and its interior is filled with multi-faceted hollow spheres; The denitrification zone 3 is inoculated with domesticated anaerobic ammonium oxidation bacteria and filled with a second filler 31. The application filling rate of the second filler 31 is 40%; The second filler 31 is hollow polypropylene PP with a diameter of 1 inch, and its interior is filled with modified polyurethane. The shortcut nitrification zone 2 is inoculated with activated sludge with a concentration of 3500-5000 mg / L and is provided with a separation baffle trough 6; The separation baffle trough 6 is vertically arranged on the partition 5 between the shortcut nitrification zone 2 and the denitrification zone 3. The bottom surface of the separation baffle trough 6 is spaced 40 cm from the bottom surface of the shortcut nitrification zone 2, and the inner wall thereof is spaced 30 cm from the partition 5; An effluent baffle trough 7 is provided in the denitrification zone 3; The effluent baffle trough 7 is vertically arranged on the partition 5 between the denitrification zone 3 and the effluent sedimentation zone 4. The bottom surface of the effluent baffle trough 7 is spaced 40 cm from the bottom surface of the denitrification zone 3, and the inner wall thereof is spaced 30 cm from the partition 5. A round hole plate 71 is provided at the bottom of the effluent baffle trough 7; The round hole plate 71 forms an angle of 10° with the partition 5.

[0040] The wastewater is discharged into the anaerobic zone 1 and, as the water level rises, reacts with the activated sludge and the first filler 11, and then overflows into the shortcut nitrification zone 2 to react with the activated sludge in the shortcut nitrification zone 2 for nitrification. The nitrified wastewater passes through the separation baffle trough 6, which separates the activated sludge and the water. The water then enters the denitrification zone 3 from the overflow port 51 and undergoes denitrification with the bacteria and fillers in the denitrification zone 3. The denitrified wastewater passes through the effluent baffle trough 7 and then enters the effluent sedimentation zone 4 from the overflow port 51 for sedimentation. Finally, it is discharged from the effluent sedimentation zone 4. During the discharge process, the excessive nitrate nitrogen and residual nitrite nitrogen in the water are timely refluxed to the anaerobic zone 1, and the reflux flow rate is controlled at 300% according to the drainage volume.

[0041] During the treatment process, the detection and regulation system regulates the DO in the shortcut nitrification zone 2 to be 0.5-2.0 mg / L and the DO in the denitrification zone 3 to be 0.5-1.0 mg / L.

[0042] No additional carbon source and chemicals are added during the treatment process. After the system starts treatment, the influent and effluent wastewater are sampled and tested every 3 days. The water quality indicators before and after treatment are compared, and the removal rates of each indicator are calculated. The treatment lasts for 30 days. The results are shown in Table 2.

[0043] Table 1 Water Quality Indicators of Anaerobic Digestion Liquid of Aquaculture Wastewater

[0044]

[0045]

[0046] Table 2 Sewage Treatment Results

[0047]

[0048] As can be seen from Table 2, after 30 days of treatment by this system, the removal rate of COD in the wastewater swamp water reaches 80.77%, the removal rate of NH 3 -N reaches 97.09%, and the removal rate of TN reaches 93.70%, effectively reducing the harmful components in the aquaculture wastewater and showing a significant denitrification effect.

[0049] Example 2

[0050] This example is used to treat yeast fermentation wastewater, and its water quality indicators are shown in Table 3.

[0051] An efficient denitrification system for treating ammonia-nitrogen wastewater, comprising an anaerobic zone 1, a shortcut nitrification zone 2, a denitrification zone 3, and an effluent sedimentation zone 4. The volume ratio of the anaerobic zone 1, the shortcut nitrification zone 2, the denitrification zone 3, and the effluent sedimentation zone 4 is 1:1:3:1. The anaerobic zone 1, the shortcut nitrification zone 2, the denitrification zone 3, and the effluent sedimentation zone 4 are connected in sequence, and a partition plate 5 is provided between adjacent reaction zones; the effluent sedimentation zone 4 is connected to the denitrification zone 3 through a pipeline to form a circulating reflux, and the regulation range of the reflux flow rate is 300%. An overflow port 51 is provided on the upper part of the partition plate 5; the anaerobic zone 1 is inoculated with activated sludge with a concentration of 3500-5000 mg / L and filled with a first filler 11. The application filling rate of the first filler 11 is 40%. The first filler 11 is hollow polypropylene PP with a diameter of 3 inches, and multi-faceted hollow balls are filled inside; the denitrification zone 3 is inoculated with domesticated anaerobic ammonium oxidation bacteria and filled with a second filler 31. The application filling rate of the second filler 31 is 20%; the second filler 31 is hollow polypropylene PP with a diameter of 1 inch, and modified polyurethane is filled inside. The shortcut nitrification zone 2 is inoculated with activated sludge with a concentration of 3500-5000 mg / L and is provided with a separation baffle trough 6; the separation baffle trough 6 is vertically arranged on the partition plate 5 between the shortcut nitrification zone 2 and the denitrification zone 3. The bottom surface of the separation baffle trough 6 is spaced 20 cm from the bottom surface of the shortcut nitrification zone 2, and the inner wall thereof is spaced 10 cm from the partition plate 5; an effluent baffle trough 7 is provided in the denitrification zone 3; the effluent baffle trough 7 is vertically arranged on the partition plate 5 between the denitrification zone 3 and the effluent sedimentation zone 4. The bottom surface of the effluent baffle trough 7 is spaced 60 cm from the bottom surface of the denitrification zone 3, and the inner wall thereof is spaced 10 cm from the partition plate 5. A round hole plate 71 is provided at the bottom of the effluent baffle trough 7; the round hole plate 71 forms a 30° angle with the partition plate 5.

[0052] The wastewater is discharged into the anaerobic zone 1 and, as the water level rises, reacts with the activated sludge and the first filler 11, and then overflows into the shortcut nitrification zone 2 to react with the activated sludge in the shortcut nitrification zone 2 for nitrification. The nitrified wastewater passes through the separation baffle trough 6, and the separation baffle trough 6 separates the activated sludge and water. The water then enters the denitrification zone 3 from the overflow port 51 and undergoes denitrification with the bacteria and filler in the denitrification zone 3. The denitrified wastewater passes through the effluent baffle trough 7 and then enters the effluent sedimentation zone 4 from the overflow port 51 for sedimentation. Finally, it is discharged from the effluent sedimentation zone 4. During the discharge process, the excessive nitrate nitrogen and residual nitrite nitrogen in the water are timely refluxed to the anaerobic zone 1, and the reflux flow rate is controlled at 100% according to the drainage volume.

[0053] During the treatment process, the detection and regulation system regulates the DO in the shortcut nitrification zone 2 to be 0.5-2.0 mg / L, and the DO in the denitrification zone 3 to be 0.5-1.0 mg / L.

[0054] No additional carbon source and chemicals are added during the treatment process. After the system starts treatment, the wastewater entering and discharging is sampled and tested every 3 days. The water quality indicators before and after treatment are compared, and the removal rates of each indicator are calculated. The treatment lasts for 30 days. The results are shown in Table 4.

[0055] Table 3 Water Quality Indicators of Yeast Fermentation Wastewater

[0056]

[0057] Table 4 Treatment Effect of Yeast Fermentation Wastewater

[0058]

[0059] As can be seen from Table 4, after being treated by this system, the removal rate of COD in the yeast wastewater reaches 90.53%, the removal rate of NH 3 -N reaches 91.13%, and the removal rate of TN reaches 86.05%, effectively reducing the harmful components in the yeast wastewater and showing a significant denitrification effect.

[0060] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An efficient denitrification system for treating ammonia nitrogen wastewater, comprising an anaerobic zone, a short-range nitrification zone, a denitrification zone, and an effluent sedimentation zone, characterized in that: The anaerobic zone, short-range nitrification zone, denitrification zone, and effluent sedimentation zone are connected in sequence, and a partition is provided between adjacent reaction zones; an overflow port is provided on the upper portion of the partition; the anaerobic zone is filled with a first filler; the denitrification zone is filled with a second filler; a separation baffle is provided in the short-range nitrification zone; the separation baffle is vertically arranged on the partition between the short-range nitrification zone and the denitrification zone; an effluent baffle is provided in the denitrification zone; the effluent baffle is vertically arranged on the partition between the denitrification zone and the effluent sedimentation zone.

2. The high-efficiency denitrification system for treating ammonia nitrogen wastewater according to claim 1, characterized in that: The first filler is hollow polypropylene PP, with a diameter of 3 inches and filled with multifaceted hollow balls; the second filler is hollow polypropylene PP, with a diameter of 1 inch and filled with modified polyurethane.

3. The high-efficiency denitrification system for treating ammonia nitrogen wastewater according to claim 2, characterized in that: The application filling rate of the first filler is 40-70%; the application filling rate of the second filler is 25-40%.

4. The high-efficiency denitrification system for treating ammonia nitrogen wastewater according to claim 1, characterized in that: The bottom surface of the separation baffle trough is 20-40 cm away from the bottom surface of the short-range nitrification zone, and the inner wall thereof is 10-30 cm away from the partition.

5. The high-efficiency denitrification system for treating ammonia nitrogen wastewater according to claim 1, characterized in that: The bottom surface of the outlet baffle trough is 40-60 cm away from the bottom surface of the denitrification zone, and the inner wall thereof is 10-30 cm away from the partition plate.

6. The high-efficiency denitrification system for treating ammonia nitrogen wastewater according to claim 5, characterized in that: A circular hole plate is arranged at the bottom of the water outlet baffle; the circular hole plate and the partition plate form an angle of 10-30 degrees.

7. The high-efficiency denitrification system for treating ammonia nitrogen wastewater according to claim 1, characterized in that: The effluent sedimentation area is connected with the denitrification area pipeline.

8. The high-efficiency denitrification system for treating ammonia nitrogen wastewater according to claim 1, characterized in that: The bottoms of the anaerobic zone, short-range nitrification zone, denitrification zone and effluent sedimentation zone are all provided with mud discharge ports.

9. The high-efficiency denitrification system for treating ammonia nitrogen wastewater according to claim 1, characterized in that: The volume ratio of the anaerobic zone, the short-range nitrification zone, the denitrification zone and the effluent sedimentation zone is 1-3:1:1-3:1.

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