Denitrification device for coupling short-cut denitrification with anaerobic ammonia oxidation

Abstract

The utility model discloses a denitrification device for coupling short-cut denitrification with anaerobic ammonia oxidation, relates to the field of sewage denitrification, and aims to solve the problem that the anaerobic ammonia oxidation process is difficult to continuously and stably operate due to insufficient abundance of anaerobic ammonia oxidation bacteria in the anaerobic ammonia oxidation process at present. The short-cut denitrification reaction chamber and the anaerobic ammonia oxidation reaction chamber are respectively provided with an ultrasonic disc to accelerate the enrichment of functional bacteria on the fluidized bed filler and improve the activity of denitrification functional bacteria, so that the denitrification efficiency and the denitrification effect of the denitrification tower are improved, the anaerobic ammonia oxidation process can be continuously and stably operated, the harmless utilization of resources is realized, and the economic benefit is increased. The method has good environmental protection and economic benefits.

Description

Technical Field

[0001] The utility model relates to the field of sewage denitrification, in particular to a denitrification device of short-range denitrification coupled with anaerobic ammonia oxidation. Background Art

[0002] In the existing technology, nitrification-denitrification denitrification process is mostly used to treat urban sewage. Faced with the growing scale of nitrogen-containing wastewater treatment, it is increasingly difficult to meet the wastewater treatment scale and effluent water quality standards in advance. The traditional nitrification-denitrification denitrification process requires high-power aeration equipment, large-scale addition of carbon sources and reagents, and the cost of sewage treatment is high. The process itself occupies a large area and has high construction costs.

[0003] At present, the anaerobic ammonium oxidation (Anammox) process has replaced the traditional nitrification-denitrification denitrification process. The anaerobic ammonium oxidation metabolic reaction mechanism is: NH4 + +1.32NO2 - +0.066HCO3 - +0.13H + →0.26NO3 - +1.02N2+0.066CH2O 0.5 N 0.15 +2.03H2O, from the perspective of anaerobic ammonium oxidation biological metabolism, this process only requires ammonia nitrogen (NH4 + ) and nitrous acid (NO2 - ), the reaction pathway is short, and the denitrification capacity and emission reduction efficiency are both advantageous. From the perspective of anaerobic ammonium oxidation process operation, it has important operating cost advantages due to the lack of DO, low carbon source and sludge production, and the device is simple and compact, with low construction cost and important economic benefits. However, it is difficult to have a stable NO2 - The reaction substrate is insufficient, and it is difficult to maintain the abundance of anaerobic ammonium oxidizing bacteria (AnAOB), resulting in the difficulty of continuous and stable operation of the anaerobic ammonium oxidation process. Utility Model Content

[0004] The purpose of the utility model is to provide a denitrification device of short-range denitrification coupled with anaerobic ammonia oxidation in view of the defects of the prior art. Ultrasonic disks are arranged in the short-range denitrification reaction chamber and the anaerobic ammonia oxidation reaction chamber respectively to accelerate the enrichment of functional bacteria on the fluidized bed filler and enhance the activity of the denitrification functional bacteria, thereby improving the denitrification efficiency and denitrification effect of the denitrification tower, realizing the harmless utilization of resources, and having good environmental protection and economic benefits.

[0005] In order to achieve the above purpose, the following technical solutions are adopted:

[0006] A denitrification device for short-range denitrification coupled with anaerobic ammonium oxidation, comprising:

[0007] The denitrification tower comprises a short-range denitrification reaction chamber and an anaerobic ammonium oxidation reaction chamber which are isolated and distributed vertically, a water inlet is arranged at the bottom of the short-range denitrification reaction chamber, and a water outlet is arranged at one side of the top of the anaerobic ammonium oxidation reaction chamber;

[0008] A water inlet hose, one end of which is connected to the top side wall of the short-distance denitrification reaction chamber, and the other end of which is connected to the bottom side wall of the anaerobic ammonium oxidation reaction chamber, so as to connect the short-distance denitrification reaction chamber and the anaerobic ammonium oxidation reaction chamber;

[0009] Fluidized bed fillers are distributed in the short-range denitrification reaction chamber and the anaerobic ammonium oxidation reaction chamber;

[0010] The ultrasonic device comprises an ultrasonic generator and an ultrasonic plate. The ultrasonic plates are respectively installed in the short-range denitrification reaction chamber and the anaerobic ammonium oxidation reaction chamber. The ultrasonic generator is respectively connected to the ultrasonic plates through wires.

[0011] Furthermore, a partition is installed on the denitrification tower, and the partition divides the internal space of the denitrification tower into a short-range denitrification reaction chamber and an anaerobic ammonium oxidation reaction chamber.

[0012] Furthermore, at least two water inlet hoses are provided, one water inlet hose is located on one side of the vertical axis of the denitrification tower, and the other water inlet hose is located on the other side of the vertical axis of the denitrification tower.

[0013] Furthermore, a conical section is provided at the bottom of the short-range denitrification reaction chamber, the water inlet is located at a small-diameter end of the conical section, and a large-diameter end of the conical section faces the anaerobic ammonium oxidation reaction chamber.

[0014] Furthermore, a mud discharge port is provided on the side wall of the short-range denitrification reaction chamber, and the mud discharge port is located between the large-diameter end of the conical section and the ultrasonic disk.

[0015] Furthermore, the fluidized bed filler in the short-range denitrification reaction chamber is suspended between the anaerobic ammonium oxidation reaction chamber and the ultrasonic disk.

[0016] Furthermore, an exhaust hole is provided on the top of the anaerobic ammonium oxidation reaction chamber.

[0017] Furthermore, the volume of the short-cut denitrification reaction chamber is greater than the volume of the anaerobic ammonium oxidation reaction chamber.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] In view of the current problem that the anaerobic ammonium oxidation process is difficult to operate continuously and stably due to the insufficient abundance of anaerobic ammonium oxidation bacteria in the anaerobic ammonium oxidation process, ultrasonic disks are arranged in the short-range denitrification reaction chamber and the anaerobic ammonium oxidation reaction chamber respectively to accelerate the enrichment of functional bacteria on the fluidized bed filler and enhance the activity of denitrification functional bacteria, thereby improving the denitrification efficiency and denitrification effect of the denitrification tower, enabling the anaerobic ammonium oxidation process to operate continuously and stably, realizing the harmless utilization of resources, and having good environmental and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of a denitrification device for short-range denitrification coupled with anaerobic ammonium oxidation in an embodiment of the utility model.

[0021] Figure 2 It is a schematic diagram of the effluent water quality of the denitrification device of the short-range denitrification coupled with anaerobic ammonia oxidation in the embodiment of the utility model.

[0022] Explanation of the numbers (in order of first appearance): 1-short-range denitrification reaction chamber; 2-anaerobic ammonium oxidation reaction chamber; 3-water inlet; 4-water inlet hose; 5-fluidized bed filler; 6-sludge outlet; 7-partition; 8-water outlet; 9-exhaust hole; 10-ultrasonic disk; 11-ultrasonic generator; 12-controller. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0024] At present, when the anaerobic ammonium oxidation process is running, it is difficult to have stable NO2 - The reaction substrate is difficult to maintain the abundance of anaerobic ammonium oxidizing bacteria. Based on this, this embodiment provides a denitrification device for coupling anaerobic ammonium oxidation with short-range denitrification. Under anaerobic conditions, NO3 - The reaction substrate is converted into NO2 - , to meet the NO2 required for anaerobic ammonium oxidation reaction - , and is equipped with an ultrasonic device to use ultrasound to accelerate the enrichment of functional bacteria and enhance the activity of denitrification functional bacteria. Therefore, in the denitrification tower, it can efficiently treat nitrate-containing wastewater and provide the substrate required for anaerobic ammonia oxidation reaction, thereby achieving harmless utilization of resources and having important environmental and economic benefits.

[0025] like Figure 1As shown, the main structure of the denitrification device of short-range denitrification coupled with anaerobic ammonium oxidation is a denitrification tower, and the interior of the denitrification tower is vertically divided into a short-range denitrification reaction chamber 1 and an anaerobic ammonium oxidation reaction chamber 2. The short-range denitrification reaction chamber 1 and the anaerobic ammonium oxidation reaction chamber 2 are isolated by a partition 7 in the denitrification tower. In order to make them connected, the connection between the short-range denitrification reaction chamber 1 and the anaerobic ammonium oxidation reaction chamber 2 is established from the side using a water inlet hose 4. Fluidized bed fillers 5 are respectively arranged in the short-range denitrification reaction chamber 1 and the anaerobic ammonium oxidation reaction chamber 2 to enrich short-range denitrifying bacteria and anaerobic ammonium oxidizing bacteria. Ultrasonic devices act on the short-range denitrification reaction chamber 1 and the anaerobic ammonium oxidation reaction chamber 2 respectively to achieve the effect of accelerating the enrichment of functional bacteria and improving the activity of denitrification functional bacteria.

[0026] Specifically, a short-cut denitrification reaction chamber 1 and an anaerobic ammonium oxidation reaction chamber 2 are provided in the denitrification tower, which are isolated and distributed vertically. The short-cut denitrification reaction chamber 1 is located at the lower part, and the anaerobic ammonium oxidation reaction chamber 2 is located at the upper part. A water inlet 3 is provided at the bottom of the short-cut denitrification reaction chamber 1, and a water outlet 8 is provided on one side of the top of the anaerobic ammonium oxidation reaction chamber 2. The sewage enters the short-cut denitrification reaction chamber 1 and flows upward into the anaerobic ammonium oxidation reaction chamber 2, and then is discharged through the water outlet 8.

[0027] NO2 required for the anaerobic ammonium oxidation process - -N substrate is difficult to provide stably, and is used in conjunction with a short-range denitrification process. A partition 7 is used to separate the short-range denitrification reaction and the anaerobic ammonium oxidation reaction, and denitrification functional areas are divided. While not affecting each other, they can synergize denitrification, which is beneficial to the stability of denitrification during the reaction operation.

[0028] One end of the water inlet hose 4 is connected to the top side wall of the short-distance denitrification reaction chamber 1, and the other end is connected to the bottom side wall of the anaerobic ammonium oxidation reaction chamber 2, connecting the short-distance denitrification reaction chamber 1 and the anaerobic ammonium oxidation reaction chamber 2, so that the wastewater treated by short-distance denitrification at the top of the short-distance denitrification reaction chamber 1 can be injected into the anaerobic ammonium oxidation reaction chamber 2.

[0029] In this embodiment, at least two water inlet hoses 4 are provided, one water inlet hose 4 is located on one side of the vertical axis of the denitrification tower, and the other water inlet hose 4 is located on the other side of the vertical axis of the denitrification tower, so that wastewater is transported upward from both sides to improve the transportation efficiency.

[0030] Contains NO3 - and NH4 + The raw water enters the short-range denitrification reaction chamber 1 through the water inlet 3 for reaction, then enters the anaerobic ammonia oxidation reaction chamber 2 through the water inlet hoses 4 distributed on both sides of the denitrification tower for reaction, and finally flows out through the water outlet 8.

[0031] A fluidized bed filler 5 is provided in the short-range denitrification reaction chamber 1 for enriching short-range denitrifying bacteria, and a fluidized bed filler 5 is provided in the anaerobic ammonium oxidation reaction chamber 2 for enriching anaerobic ammonium oxidizing bacteria. The fluidized bed filler 5 is K1 filler.

[0032] The filling rate of the fluidized bed filler 5K1 of the short-cut denitrification reaction chamber 1 is 15% to 20%, and it is arranged in a suspended manner in the short-cut denitrification reaction chamber 1. The filling rate of the fluidized bed filler 5K1 of the anaerobic ammonia oxidation reaction chamber 2 is 55% to 65%.

[0033] like Figure 1 As shown, the ultrasonic device includes an ultrasonic generator and an ultrasonic disc 10. The ultrasonic disc 10 is respectively installed in the short-range denitrification reaction chamber 1 and the anaerobic ammonium oxidation reaction chamber 2. The ultrasonic generator is respectively connected to the ultrasonic disc 10 through a wire. The ultrasonic generator 11 is controlled by a controller 12 to adjust the working frequency of the ultrasonic generator 11, thereby changing the frequency, amplitude and other parameters of the ultrasonic wave output by the ultrasonic disc 10.

[0034] Adding fluidized bed filler 5 and ultrasonic device accelerates the enrichment of functional bacteria such as short-range denitrifying bacteria and anaerobic ammonium oxidation bacteria, accelerates the start-up time of the denitrification device of short-range denitrification coupled with anaerobic ammonium oxidation, and at the same time, increases the stability of the subsequent reaction operation process. There is no need to add external carbon source and adjust pH. The denitrification device of short-range denitrification coupled with anaerobic ammonium oxidation is simple and compact, easy to maintain, saves material costs such as reagents and labor costs, and has the dual benefits of environmental protection and economy.

[0035] A conical section is provided at the bottom of the short-range denitrification reaction chamber 1, and the water inlet 3 is located at the small diameter end of the conical section. The large diameter end of the conical section faces the anaerobic ammonia oxidation reaction chamber 2. The conical section whose cross-sectional area gradually expands along the wastewater flow direction is used to achieve water distribution of the wastewater.

[0036] A sludge discharge port 6 is provided on the side wall of the short-range denitrification reaction chamber 1, and the sludge discharge port 6 is located between the large diameter end of the conical section and the ultrasonic disc 10, and can discharge the sludge deposited in the short-range denitrification reaction chamber 1. An exhaust hole 9 is provided on the top of the anaerobic ammonium oxidation reaction chamber 2 for discharging the gas generated during the reaction process.

[0037] The volume of the short-cut denitrification reaction chamber 1 is greater than that of the anaerobic ammonium oxidation reaction chamber 2. In this embodiment, the height-to-diameter ratio of the denitrification tower is 7.5, and the volume ratio of the solidified short-cut denitrification reaction chamber 1 to the anaerobic ammonium oxidation reaction chamber 2 is 1.5:1.

[0038] In this embodiment, the step of enriching short-range denitrifying bacteria and anaerobic ammonia oxidizing bacteria includes:

[0039] Enrichment of short-range denitrifying bacteria: Inoculate laboratory domesticated short-range denitrifying sludge and sludge in the anaerobic tank of the sewage plant. The sludge mixing volume ratio is 1:2, the sludge concentration is about 5000mg / L, and the sludge volume accounts for about 30% of the volume of the short-range denitrification reaction chamber 1. The operating conditions are controlled at a temperature of 30℃, a DO concentration of less than 0.7mg / L and a pH value of about 7.5. Control the NH4 + -N concentration is 55mg / L, NO3 - -N concentration is 125mg / L, COD concentration is 150mg / L; under the above conditions, short-range denitrifying bacteria are enriched. It should be understood that only when the COD removal rate is greater than 90% and NO3 - When the -N accumulation rate is greater than 85%, it can be considered that the short-cut denitrifying bacteria in the short-cut denitrification reaction chamber 1 are successfully enriched.

[0040] Enrichment of anaerobic ammonium oxidizing bacteria: inoculate the anaerobic ammonium oxidizing sludge cultivated in the laboratory and the sludge in the anaerobic tank of the sewage treatment plant, the sludge concentration is about 3000mg / L, the sludge mixing volume ratio is 2:1, the sludge volume accounts for 25% of the volume of the anaerobic ammonium oxidizing reaction chamber 2, and the operating conditions are controlled to be 30℃, and the anaerobic DO concentration is strictly maintained below 0.3mg / L. The wastewater treated by the short-range denitrification reaction chamber 1 is injected into the anaerobic ammonium oxidizing reaction chamber 2 through the water flow direction distributed on both sides of the denitrification device; enrich anaerobic ammonium oxidizing bacteria under the above conditions. It should be understood that only when NH4 + -N removal rate is greater than 85%, NO2 - When the -N removal rate is greater than 85%, it can be considered that the anaerobic ammonium oxidizing bacteria in the anaerobic ammonium oxidizing reaction chamber 2 are successfully enriched. The measures of pre-enriching short-range denitrifying bacteria and anaerobic ammonium oxidizing bacteria are conducive to ensuring the stable operation and treatment effect of the denitrification device of short-range denitrification coupled with anaerobic ammonium oxidation.

[0041] After the short-range denitrifying bacteria and anaerobic ammonium oxidizing bacteria are enriched, the steps of treating wastewater using a denitrification device coupled with short-range denitrification and anaerobic ammonium oxidation include:

[0042] Contains NO3 - -N and NH4 + -N raw water enters the short-distance denitrification reaction chamber 1 of the denitrification device of short-distance denitrification coupled with anaerobic ammonium oxidation from the water inlet 3, and the short-distance denitrification reaction is carried out by using the pre-enriched short-distance denitrifying bacteria. The treated wastewater then enters the anaerobic ammonium oxidation reaction chamber 2 along the water flow through the water inlet hose 4 for reaction. The anaerobic and mesophilic environment (DO is less than 0.3 mg / L and the temperature is maintained at 30°C) is strictly controlled and the concentration is controlled at 3.5±0.5 to carry out anaerobic ammonium oxidation reaction denitrification.

[0043] The ultrasonic device includes an ultrasonic disc 10 and an ultrasonic generator 11. The ultrasonic generator 11 is arranged outside the denitrification tower. Two ultrasonic discs 10 are arranged in the short-range denitrification reaction chamber 1 and the anaerobic ammonium oxidation reaction chamber 2, respectively. The ultrasonic disc 10 is close to the inner wall of the short-range denitrification reaction chamber 1 and the anaerobic ammonium oxidation reaction chamber 2. The two ultrasonic discs 10 are connected to the ultrasonic generator 11 by a data line, and are finally connected to the controller 12 for control. The controller 12 can adopt a single-chip microcomputer, a PLC controller, etc. The ultrasonic device is mainly used to accelerate the enrichment of short-range denitrifying bacteria and anaerobic ammonium oxidizing bacteria. In the actual operation process, the ultrasonic wave can also maintain the permeability of the cell membrane of the short-range denitrifying bacteria and the anaerobic ammonium oxidizing bacteria, and promote the stability of the denitrification effect of the denitrification device of the short-range denitrification coupled with the anaerobic ammonium oxidation.

[0044] The effluent water quality of the short-cut denitrification reaction chamber 1 and the anaerobic ammonium oxidation reaction chamber 2 during the operation of the short-cut denitrification coupled anaerobic ammonium oxidation denitrification device is shown in the figure below: Figure 2 As shown. The effluent NH4 after short-cut denitrification reaction + -N concentration was maintained at 135mg / L, NO2 - -N concentration was maintained at 150mg / L, NO2 - -N and NH4 + -N ratio is controlled at 1.11, and the effluent NO2 after anaerobic ammonium oxidation treatment - -N and NH4 + -N were 2.1 and 1.3 mg / L respectively, with strong denitrification capacity.

[0045] The above detailed description of the specific implementation of the utility model is only used as an example, and the utility model is not limited to the specific implementation described above. For those skilled in the art, any equivalent modification or substitution of the utility model is also within the scope of the utility model. Therefore, the equalization, modification, improvement, etc. made without departing from the spirit and principle of the utility model should be included in the scope of the utility model.

Claims

1. A denitrification device for short-range denitrification coupled with anaerobic ammonium oxidation, characterized in that: include: The denitrification tower comprises a short-range denitrification reaction chamber and an anaerobic ammonium oxidation reaction chamber which are isolated and distributed vertically, a water inlet is arranged at the bottom of the short-range denitrification reaction chamber, and a water outlet is arranged at one side of the top of the anaerobic ammonium oxidation reaction chamber; A water inlet hose, one end of which is connected to the top side wall of the short-distance denitrification reaction chamber, and the other end of which is connected to the bottom side wall of the anaerobic ammonium oxidation reaction chamber, so as to connect the short-distance denitrification reaction chamber and the anaerobic ammonium oxidation reaction chamber; Fluidized bed fillers are distributed in the short-range denitrification reaction chamber and the anaerobic ammonium oxidation reaction chamber; The ultrasonic device comprises an ultrasonic generator and an ultrasonic plate. The ultrasonic plates are respectively installed in the short-range denitrification reaction chamber and the anaerobic ammonium oxidation reaction chamber. The ultrasonic generator is respectively connected to the ultrasonic plates through wires.

2. The denitrification device of short-range denitrification coupled with anaerobic ammonium oxidation according to claim 1, characterized in that: The denitrification tower is provided with a partition plate, which divides the inner space of the denitrification tower into a short-range denitrification reaction chamber and an anaerobic ammonia oxidation reaction chamber.

3. The denitrification device of short-range denitrification coupled with anaerobic ammonium oxidation according to claim 2, characterized in that: At least two water inlet hoses are provided, one of which is located on one side of the vertical axis of the denitrification tower, and the other water inlet hose is located on the other side of the vertical axis of the denitrification tower.

4. The denitrification device of short-range denitrification coupled with anaerobic ammonium oxidation according to claim 1, characterized in that: A conical section is provided at the bottom of the short-range denitrification reaction chamber, a water inlet is located at a small-diameter end of the conical section, and a large-diameter end of the conical section faces the anaerobic ammonium oxidation reaction chamber.

5. The denitrification device of short-range denitrification coupled with anaerobic ammonium oxidation according to claim 4, characterized in that: A mud discharge port is arranged on the side wall of the short-range denitrification reaction chamber, and the mud discharge port is located between the large-diameter end of the conical section and the ultrasonic disc.

6. The denitrification device of short-range denitrification coupled with anaerobic ammonium oxidation according to claim 1, characterized in that: The fluidized bed filler in the short-range denitrification reaction chamber is suspended and arranged between the anaerobic ammonium oxidation reaction chamber and the ultrasonic disk.

7. The denitrification device of short-range denitrification coupled with anaerobic ammonium oxidation according to claim 1, characterized in that: An exhaust hole is arranged on the top of the anaerobic ammonium oxidation reaction chamber.

8. The denitrification device of short-range denitrification coupled with anaerobic ammonium oxidation according to claim 1, characterized in that: The volume of the short-cut denitrification reaction chamber is greater than the volume of the anaerobic ammonium oxidation reaction chamber.

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