CN216614184U - Novel continuous flow large-circulation anaerobic ammonia oxidation process reaction device - Google Patents

Abstract

The utility model discloses a novel continuous flow large-circulation anaerobic ammonium oxidation process reaction device, wherein a PDA reaction tank, an aeration tank and a PNA reaction tank are arranged in sequence, connected by connecting pipes I and connecting pipes II in sequence, and water distribution pipes are all arranged at the bottom. ; The PNA reaction tank is connected to the water inlet pipe at the front end of the PDA reaction tank through the connection pipe III; the aeration tank is connected to the blower, and the aeration tank is aerated through the aerator and the air volume adjustment flowmeter; the reaction device is equipped with a real-time control system, PNA The online DO monitor I, online DO monitor II, online DO monitor III, online ammonia nitrogen monitor, and online nitrate nitrogen monitor are set up in the reaction tank. The data from the online monitor is collected by the control box and fed back to the gas according to the control program. Adjust the flow meter to realize the adjustment of the aeration volume. The device can realize continuous operation, simple structure, convenient operation, no stirring and mixing equipment, and low maintenance cost.

Description

A New Continuous Flow Large Circulation Anammox Process Reactor

technical field

The utility model relates to a sewage biochemical treatment device, belonging to the technical field of sewage biological treatment, in particular to a novel continuous flow large-circulation anaerobic ammonia oxidation process reaction device.

Background technique

At present, the application of anammox process is mainly in the form of carrier biofilm and granular sludge. Among them, carrier biofilm can achieve a good film hanging effect and achieve the retention of anammox bacteria in the reaction device, but Its main application is the integrated anammox process, and its application in the two-stage anammox process is limited by the lack of a better stirring form, resulting in the pollutants in the sewage and the carrier biofilm. It is difficult for the functional bacteria to contact fully and effectively, and a good mixing effect cannot be obtained, which causes sludge to accumulate on the surface of the carrier biofilm, which seriously affects the treatment effect and limits the large-scale application of the two-stage anammox process; secondly , The project started to use carrier biofilm as inoculated sludge, which has great difficulties in production, transportation, storage, installation, inoculation, etc., and the cost is high.

The granular sludge anammox process does not require a carrier. The granular sludge-like anammox bacteria have good sedimentation performance, can be effectively retained in the reactor, and have high shock load resistance. They can be used as the preferred sludge for project start-up inoculation. Its cultivation is difficult, and the start-up time of the world's first granular sludge anammox project is as long as 2.5 years; in the current granular sludge anammox process, the formation of granular sludge mainly depends on aeration The backflow with a large proportion of liquid provides shear force, consumes a lot of electric energy, and it is difficult to control the conditions.

Anammox process is currently recognized as the most economical and efficient wastewater denitrification technology, but the above two problems: (1) biofilm process is difficult to obtain good mixed mass transfer effect, engineering inoculation is difficult, and the cost is high, (2) ) The granular sludge is difficult to start quickly, the power consumption is large, and the control conditions are difficult, which seriously restricts the engineering process of the anammox process.

Utility model content

The purpose of this utility model is to solve the above-mentioned technical problems, and propose a novel continuous flow large-cycle anammox process reaction device. The utility model reaction device can realize continuous operation, simple structure, convenient operation, no stirring and mixing equipment, and low maintenance cost. , the circulation volume in the system is as high as 20~200 times, and the upward flow rate is 5~30m/h, which effectively realizes the full mixing and mass transfer of the anammox carrier biofilm and sewage, and promotes the rapid particle size of suspended microorganisms in the pool. change.

The utility model provides a novel continuous flow large-cycle anammox process reaction device, the structure of which is shown in accompanying drawing 1, and is characterized in that:

The reaction device includes a PDA reaction tank, an aeration tank, a PNA reaction tank, an online DO monitor I, an online DO monitor II, an online DO monitor III, an online ammonia nitrogen monitor, an online nitrate monitor, a blower, and a gas regulator. Flow meter, aerator, water distribution pipe, water inlet pipe, connecting pipe I, connecting pipe II, connecting pipe III, water outlet pipe and control box.

Among them, the PDA reaction tank, the aeration tank, and the PNA reaction tank are arranged in sequence, and water distribution pipes are arranged at the bottom; The PNA reaction tank is connected to the water inlet pipe at the front end of the PDA reaction tank through the connecting pipe III; the aeration tank is connected to the blower, and the aeration tank is aerated through the aerator and the air volume adjustment flowmeter; the PNA reaction tank is connected to the water outlet pipe.

The sewage in the water inlet pipe is mixed with the backflow liquid in the connecting pipe III, and enters the bottom area of the PDA reaction tank together through the water distribution pipe; the effluent from the upper part of the PDA reaction tank flows through the connecting pipe I through the water distribution pipe, and enters the aeration tank together. The effluent from the upper part of the aeration tank flows into the bottom area of the PNA reaction tank through the connecting pipe II and the water distribution pipe together; emission;

The reaction device is provided with a real-time control system, and the PNA reaction tank is provided with an online DO monitor I, an online DO monitor II, an online DO monitor III, an online ammonia nitrogen monitor, and an online nitrate monitor, which are collected online by the control box. The data of the monitor is fed back to the gas adjustment flowmeter according to the control program to realize the adjustment of the aeration volume.

Preferably, the shape of the PDA reaction tank, the aeration tank, and the PNA reaction tank can be a cube, a cylinder or an elliptical cylinder, etc., and also include other shapes improved according to the method described in the utility model patent.

Preferably, the water distribution pipe is provided with one or more water distribution main pipes and branch pipes. Based on the midplane of the pipe, only on the same horizontal plane on one side of the pipe, there are evenly distributed water distributions with an oblique direction of 40 to 50 degrees. The diameter and number of holes and water distribution holes should be set according to the actual situation.

Preferably, the online DO monitor I, online DO monitor II, and online DO monitor III are respectively located at the lower, middle and upper parts of the side wall of the PNA reaction tank, and their setting points are respectively 1/6~1/6 of the longitudinal height of the tank body. 1/4, 1/2 and 3/4.

The novel continuous flow large-cycle anammox process real-time control method adopts the novel continuous-flow large-cycle anammox process reaction device, including the following steps:

1) Inoculated sludge: The PDA reaction tank is inoculated with short-range denitrification floc sludge with stable performance and cultured anammox floc sludge or carrier biofilm, with a volume ratio of 1:1, which makes the mixed sludge concentration in the tank In 4~8g/L; PNA reaction tank is inoculated with stable short-range nitrification floc sludge and cultured anammox floc sludge or carrier biofilm, with a volume ratio of 1:1, which makes the mixed sludge concentration in the tank At 4~8g/L;

2) The sewage from the water inlet pipe is mixed with the liquid returning from the connecting pipe III, and enters the bottom area of the PDA reaction tank evenly through the water distribution pipe installed with the water distribution hole direction downward, with an average sludge concentration of 4~8g/L; The short-range denitrifying bacteria use the organic matter in the sewage to reduce the nitrate nitrogen in the returning liquid in the connection pipe III to nitrite nitrogen, and the newly generated nitrite nitrogen and the ammonia nitrogen in the sewage are under the action of anaerobic ammonia oxidizing bacteria. The reaction generates nitrogen, which is discharged into the air;

3) The effluent from the upper part of the PDA reaction tank flows through the connecting pipe I through the water distribution pipe installed in the upward direction of the water distribution hole, and enters the bottom area of the aeration tank together, and the aeration volume is 2-20 L/(m ² ·s);

4) The effluent from the upper part of the aeration tank flows through the connecting pipe II through the water distribution pipe installed in the downward direction of the water distribution hole, and enters the bottom area of the PNA reaction tank together; the average sludge concentration is 4~8g/L; The ammonia nitrogen of the pollutants is partially oxidized to nitrite nitrogen, and the newly generated nitrite nitrogen and the remaining ammonia nitrogen in the sewage react under the action of anaerobic ammonia oxidizing bacteria to generate nitrogen, which is discharged into the air;

5) The circulating liquid in the upper part of the PNA reaction tank flows through the connecting pipe III and mixes with the sewage in the water inlet pipe, and evenly enters the bottom area of the PDA reaction tank; the effluent is discharged from the water outlet pipe.

Preferably, the circulation multiple of the circulating liquid in the upper part of the PNA reaction tank is 20 to 200 times.

Preferably, the flow rate of the water distribution holes on the water distribution pipe is controlled at 60-300 m/h; the upward flow velocity of the liquid in the PDA reaction tank and the PNA reaction tank is 5-30 m/h, and the suspended microorganisms in the tank have a median diameter of 5 to 30 m/h. 50~800μm.

Preferably, the dissolved oxygen in the PNA reaction tank is 0.1-0.5 mg/L.

Preferably, the volume ratio of the PDA reaction tank, the aeration tank, and the PNA reaction tank is 1:0.1~1:0.5~1.5, and the hydraulic retention time is 0.5~16 h.

Preferably, the control box collects the data of the online monitor, and feeds it back to the gas adjustment flowmeter according to the control program, so as to realize the adjustment of the aeration volume. The specific control program settings are as follows:

a) When any one of the online DO monitor I, online DO monitor II, and online DO monitor III in the PNA reaction cell shows that the dissolved oxygen is greater than 0.5 mg/L, reduce the working frequency of the blower or reduce the gas adjustment flowmeter until the dissolved oxygen is detected to be 0.1~0.5 mg/L, and the adjustment equipment is restored to the initial state.

b) When the ammonia nitrogen concentration in the effluent of the PNA reaction tank is greater than 4.5mg/L, increase the operating frequency of the blower or increase the opening of the gas regulating flowmeter until the ammonia nitrogen concentration is detected <4.5mg/L, and restore the regulating equipment to the initial state .

c) When the nitrate nitrogen concentration in the effluent of the PNA reaction tank is greater than 10mg/L, reduce the operating frequency of the blower or reduce the opening degree of the gas regulating flowmeter until the nitrate nitrogen concentration is less than 10mg/L, and restore the regulating equipment to the initial state .

The technical scheme of the present utility model has the following beneficial effects:

1) It can combine short-range denitrification/anammox with short-range nitrification/anammox and realize it in the same system, which can give full play to the advantages of anammox process, achieve high denitrification efficiency and save exposure to exposure. Gas energy consumption, reduce greenhouse gas emissions, reduce sludge production, reduce chemical consumption;

2) The short-range denitrifying bacteria and anammox bacteria are the dominant bacteria in the PDA reaction tank. The short-range denitrifying bacteria can use the carbon source in the raw water to reduce the nitrate nitrogen produced by anammox to nitrite nitrogen, In order to improve the theoretical denitrification efficiency of the anammox process;

3) The utility model can realize up to 20~200 times of circulation volume and 5~30m/h rising flow rate, can solve the problem of poor mixed mass transfer effect of carrier biofilm anammox process, and can realize anammox carrier Fully mixed mass transfer between biofilm and sewage; it can solve the problems of long start-up period, large power consumption and difficult control of granular sludge anammox process, and can promote the rapid granulation of suspended microorganisms in the pool;

4) The microorganisms in the reaction device of the utility model are mainly granular sludge, which has strong resistance to water quality and water impact load, good settling performance, and can be effectively retained in the reactor, without the need for subsequent mud-water separation units, reducing pool capacity and structure infrastructure. cost.

5) The reaction device of the utility model can realize continuous operation, simple structure, convenient operation, no stirring and mixing equipment, and low maintenance cost.

6) The utility model is environmentally friendly, economical and efficient, and provides a new implementation scheme for the engineering of the anammox process.

Description of drawings

Fig. 1 is the structural representation of the novel continuous flow large-cycle anammox process reaction device described in the utility model;

The reference numerals are explained as follows:

1-PDA reaction tank; 2-Aeration tank; 3-PNA reaction tank; 3.1-On-line DO monitor I; 3.2-On-line DO monitor II; 3.3-On-line DO monitor III; 3.4-On-line ammonia nitrogen monitor; 3.5 -Online nitrate and nitrogen monitor; 4-Blower; 4.1-Gas regulating flowmeter; 4.2-Aerator; 5-Water distribution pipe; 6-Water inlet pipe; 7-Connecting pipe I; 8-Connecting pipe II; 9-Connecting pipe Ⅲ; 10-water outlet pipe; 11-control box.

Detailed ways

The utility model patent will be further described below in conjunction with the accompanying drawings and embodiments.

Example 1

Fig. 1 is the structural principle schematic diagram of the novel continuous flow large-cycle anammox process reaction device embodiment provided by the utility model, the reaction device comprises PDA reaction tank 1, aeration tank 2, PNA reaction tank 3, online DO monitoring Instrument I3.1, online DO monitor II3.2, online DO monitor III3.3, online ammonia nitrogen monitor 3.4, online nitrate nitrogen monitor 3.5, blower 4, gas regulating flowmeter 4.1, aerator 4.2, water distribution pipe 5. Water inlet pipe 6, connecting pipe I7, connecting pipe II8, connecting pipe III9, water outlet pipe 10 and control box 11.

Among them, PDA reaction tank 1, aeration tank 2, PNA reaction tank 3 are arranged in sequence, and water distribution pipes 5 are arranged at the bottom; The pools 3 are connected by connecting pipe II8; the PNA reaction pool 3 is connected with the water inlet pipe 6 at the front end of the PDA reaction pool 1 through the connecting pipe III9; the aeration pool 2 is connected with the blower 4, and is connected to the aerator 4.2 and the air volume adjustment flow meter 4.1. The aeration tank 2 carries out aeration adjustment; the PNA reaction tank 3 is connected with the water outlet pipe 10 .

The sewage of the water inlet pipe 6 is mixed with the liquid backflow in the connecting pipe III9, and enters the bottom area of the PDA reaction tank 1 together through the water distribution pipe 5; , enter the bottom area of the aeration tank 2 together; the effluent from the upper part of the aeration tank 2 flows through the connecting pipe II 8 through the water distribution pipe 5, and enters the bottom area of the PNA reaction tank 3 together; the circulating liquid in the upper part of the PNA reaction tank 3 flows through the connecting pipe III9 is mixed with the sewage in the water inlet pipe 6, and the outlet water is discharged from the water outlet pipe 10;

The reaction device is provided with a real-time control system, and the PNA reaction pool 3 is provided with an online DO monitor I3.1, an online DO monitor II3.2, an online DO monitor III3.3, an online ammonia nitrogen monitor 3.4, and an online nitrate nitrogen monitor. The monitoring instrument 3.5 collects the data of the online monitoring instrument by the control box 11, and feeds it back to the gas adjustment flow meter 4.1 according to the control program to realize the adjustment of the aeration amount.

The shape of the PDA reaction tank 1, the aeration tank 2, the PNA reaction tank 3 can be a cube, a cylinder or an elliptical cylinder, etc., and also include other shapes improved according to the method described in the utility model patent.

The water distribution pipe 5 is provided with one or more water distribution main pipes and branch pipes. Based on the midplane of the pipe, only on the same horizontal plane on one side of the pipe, there are uniformly opened water distribution holes with an oblique direction of 40 to 50 degrees. The diameter and number of water distribution holes should be set according to the actual situation.

The online DO monitor I3.1, online DO monitor II3.2, and online DO monitor III3.3 are respectively located at the lower, middle and upper part of the side wall of the PNA reaction tank 3, and their setting points are respectively at the longitudinal height of the tank body. 1/6~1/4, 1/2 and 3/4.

The method of utilizing the above-mentioned device to treat low carbon nitrogen ratio sewage is as follows:

A real-time control method for a novel continuous-flow large-cycle anammox process reaction, the method adopts the novel continuous-flow large-cycle anammox process reaction device, comprising the following steps:

1) Inoculated sludge: PDA reaction tank 1 is inoculated with short-range denitrification floc sludge with stable performance and cultured anammox floc sludge or carrier biofilm, with a volume ratio of 1:1, which makes the sludge mixed in the tank The concentration is 4~8g/L; PNA reaction tank 3 is inoculated with short-range nitrification floc sludge with stable performance and cultured anammox floc sludge or carrier biofilm, with a volume ratio of 1:1, which makes the tank mixed with sewage. The mud concentration is 4~8g/L;

2) The sewage in the water inlet pipe 6 is mixed with the liquid returning from the connecting pipe III9, and enters the bottom area of the PDA reaction tank 1 evenly through the water distribution pipe 5 installed with the water distribution hole direction downward, with an average sludge concentration of 4~8g /L; short-range denitrifying bacteria use the organic matter in the sewage to reduce the nitrate nitrogen in the returning liquid in the connection pipe III9 to nitrite nitrogen, and the newly generated nitrite nitrogen and the ammonia nitrogen in the sewage are in the anaerobic ammonia oxidation bacteria. Under the action of the reaction, nitrogen is generated and discharged into the air;

3) The effluent from the upper part of the PDA reaction tank 1 flows through the connecting pipe I7 through the water distribution pipe 5 installed in the upward direction of the water distribution hole, and enters the bottom area of the aeration tank 2 together. The aeration volume is 2-20 L/(m ² · s);

4) The effluent from the upper part of the aeration tank 2 flows through the connecting pipe II8 through the water distribution pipe 5 installed with the water distribution hole downward, and enters the bottom area of the PNA reaction tank 3 together; the average sludge concentration is 4~8g/L; short-range nitrifying bacteria Partially oxidize the pollutant ammonia nitrogen in the sewage to nitrite nitrogen, and the newly generated nitrite nitrogen and the remaining ammonia nitrogen in the sewage react under the action of anaerobic ammonia oxidizing bacteria to generate nitrogen, which is discharged into the air;

5) The circulating liquid in the upper part of the PNA reaction tank 3 flows through the connecting pipe III9 to mix with the sewage in the water inlet pipe 6, and evenly enters the bottom area of the PDA reaction tank 1; the effluent is discharged from the water outlet pipe 10.

The circulation multiple of the circulating liquid in the upper part of the PNA reaction tank 3 is 20-200 times.

The flow velocity of the water distribution holes on the water distribution pipe 5 is controlled at 60~300m/h; the liquid rising flow velocity in the PDA reaction tank 1 and the PNA reaction tank 3 is 5~30m/h, and the suspended microorganisms in the tank are at the median level. The diameter is 50~800μm.

The dissolved oxygen in the PNA reaction tank 3 is 0.1-0.5 mg/L.

The volume ratio of the PDA reaction tank 1, the aeration tank 2, and the PNA reaction tank 3 is 1:0.1~1:0.5~1.5, and the hydraulic retention time is 0.5~16 h.

The control box 11 collects the data of the online monitor, and feeds it back to the gas adjustment flow meter 4.1 according to the control program, so as to realize the adjustment of the aeration amount. The specific control program settings are as follows:

a) When any one of the online DO monitor I3.1, online DO monitor II3.2, and online DO monitor III3.3 in PNA reaction pool 3 shows dissolved oxygen > 0.5 mg/L, reduce the work of blower 4 Frequency or reduce the opening of the gas adjustment flowmeter 4.1 until the detected dissolved oxygen is 0.1~0.5 mg/L, and restore the adjustment equipment to the initial state.

b) When the ammonia nitrogen concentration in the effluent of the PNA reaction tank 3 is greater than 4.5mg/L, increase the operating frequency of the blower 4 or increase the opening of the gas adjustment flowmeter 4.1 until the ammonia nitrogen concentration is detected <4.5mg/L, and restore the adjustment equipment to the initial state.

c) When the concentration of nitrate nitrogen in the effluent of the PNA reaction tank 3 is greater than 10mg/L, reduce the operating frequency of the blower 4 or reduce the opening of the gas regulating flowmeter 4.1 until the concentration of nitrate nitrogen is less than 10mg/L, and restore the regulating equipment to the initial state.

The water quality characteristics of the device are as follows: COD = 40~300 mg/L, TN = 25~60 mg/L, NH ₄ ⁺ -N = 22~58 mg/L, C/N=1.1~4.6 (the average value is 2.3 ) of urban sewage, the treatment volume Q = 3.5 L/h. The sludge in the PDA reaction tank and the PNA reaction tank was evenly mixed, the sludge concentration was maintained at 6~7 g/L, the ascending flow rate was 6 m/h, and the median diameter of the microorganism was 80 μm; the PDA reaction tank, the aeration tank and the PNA reaction tank The volume ratio of the reaction tank is 1:0.8:1; the hydraulic retention time is 12h; the sludge is not actively discharged; the initial aeration volume of the aeration tank is set to 9 L/(m ² ·s), and the circulation multiple of the circulating liquid is 30 The dissolved oxygen in the PNA reaction tank is controlled at 0.2~0.5 mg/L, and the aeration rate is adjusted according to the set procedure according to the dissolved oxygen in the PNA reaction tank and the indication of the online monitor. The effluent COD is within 50 mg/L, the effluent NH ₄ ⁺ -N is within 2 mg/L, and the effluent TN is within 5 mg/L.

The above are specific embodiments of the present invention, which are convenient for those skilled in the art to understand and apply, and the implementation of the present invention is not limited thereto.

Claims (5)

1. Novel continuous flow large-circulation anaerobic ammonia oxidation process reaction device, which is characterized in that:

the reaction device comprises a PDA reaction tank (1), an aeration tank (2) and a PNA reaction tank (3) which are arranged in sequence, and water distribution pipes (5) are arranged at the bottoms of the PDA reaction tank, the aeration tank and the PNA reaction tank; the PDA reaction tank (1) is connected with the aeration tank (2) through a connecting pipe I (7), and the aeration tank (2) is connected with the PNA reaction tank (3) through a connecting pipe II (8); the PNA reaction tank (3) is connected with a water inlet pipe (6) at the front end of the PDA reaction tank (1) through a connecting pipe III (9); the aeration tank (2) is connected with a blower (4), and aeration regulation is carried out on the aeration tank (2) through an aerator (4.2) and a gas regulation flowmeter (4.1); the PNA reaction tank (3) is connected with a water outlet pipe (10);

the sewage of the water inlet pipe (6) is mixed with the liquid reflowing in the connecting pipe III (9) and enters the bottom area of the PDA reaction tank (1) through the water distribution pipe (5); the effluent from the upper part of the PDA reaction tank (1) flows through a connecting pipe I (7) and passes through a water distribution pipe (5) and enters the bottom area of the aeration tank (2) together; the effluent from the upper part of the aeration tank (2) flows through a connecting pipe II (8) and passes through a water distribution pipe (5) and enters the bottom area of the PNA reaction tank (3) together; circulating liquid at the upper part of the PNA reaction tank (3) flows through a connecting pipe III (9) to be mixed with sewage of the water inlet pipe (6), and effluent is discharged through a water outlet pipe (10);

reaction unit sets up real-time control system, set up online DO monitor I (3.1), online DO monitor II (3.2), online DO monitor III (3.3), online ammonia nitrogen monitor (3.4), online nitrate nitrogen monitor (3.5) in PNA reaction tank (3), collect the data of online monitor by control box (11) to according to control procedure feedback to gas regulation flowmeter (4.1), realize the regulation of aeration rate.

2. The novel continuous flow large circulation anaerobic ammonia oxidation process reaction device according to claim 1, characterized in that the PDA reaction tank (1), the aeration tank (2) and the PNA reaction tank (3) are in the shape of a cube, a cylinder or an elliptic cylinder.

3. The novel continuous flow large circulation anaerobic ammonia oxidation process reaction device according to claim 1, wherein the volume ratio of the PDA reaction tank (1), the aeration tank (2) and the PNA reaction tank (3) is 1: 0.1-1: 0.5-1.5.

4. The continuous flow large circulation anaerobic ammonia oxidation process reaction device according to claim 1, wherein the water distribution pipes (5) are provided with one or more water distribution main pipes and branch pipes, and water distribution holes inclined by 40-50 degrees are uniformly formed only on the same horizontal plane on one side of the pipe with the middle plane of the pipe as a reference, and the hole diameters and the number of the water distribution holes are set according to actual conditions.

5. The novel continuous flow large circulation anaerobic ammonia oxidation process reaction device according to claim 1, wherein an online DO monitor I (3.1), an online DO monitor II (3.2) and an online DO monitor III (3.3) are respectively positioned at the lower part, the middle part and the upper part of the side wall of the PNA reaction tank (3), and the setting points are respectively positioned at the longitudinal height 1/6-1/4, 1/2 and 3/4 of the tank body.

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