CN111392874A - High ammonia nitrogen autotrophic nitrogen removal device - Google Patents

Abstract

The invention discloses a high ammonia nitrogen autotrophic nitrogen removal device, which comprises a reactor body, wherein the reactor body comprises a reaction zone, a precipitation zone and a gas outlet zone from bottom to top: the reaction zone comprises a plurality of semi-open guide plates and an aeration chamber formed by separating partition plates, the fixed ends of the guide plates and the partition plates are oppositely arranged on the inner wall of the reactor body, the guide plates and the partition plates are arranged at intervals, an aeration pipe is arranged in the aeration chamber on one side of the partition plates, and a water inlet for water inlet is formed in the bottom of the reaction zone; a three-phase separator is arranged between the sedimentation area and the air outlet area, the three-phase separator is two mud guards inclining downwards, and a gap between the two mud guards and a gap between the mud guards and the reactor body form an overflowing channel; the air outlet area is provided with a water outlet for water outlet. The invention realizes adaptive oxygen supply through DO sectional regulation, provides adaptive conditions for different functional bacteria, can effectively reduce the biomass loss of the system, increases the biomass of the system and improves the denitrification performance of the system.

Description

A high ammonia nitrogen autotrophic denitrification device

technical field

The invention relates to the technical field of biological treatment of nitrogen-containing wastewater, more particularly, to a high-ammonia-nitrogen autotrophic denitrification device.

Background technique

The traditional biological denitrification process often limits the denitrification performance due to the lack of carbon sources in the treatment of high ammonia nitrogen and low C/N wastewater, and additional organic matter needs to be added, which increases the operating cost and easily causes the risk of secondary pollution, which is not conducive to the safety and economy of the system. run. The new denitrification process technology that combines the advantages of short-path nitrification and anammox processes can realize short-path nitrification and anammox in the same reactor. It uses AOB to convert part of ammonia nitrogen into nitrite nitrogen, and then cooperates with anaerobic ammonia oxidation (Anammox) bacteria to directly generate nitrogen gas with ammonia nitrogen in water as electron donor and nitrite as electron acceptor to realize green denitrification. Purpose. Compared with the traditional nitrification-denitrification denitrification process, the whole process of autotrophic denitrification has the advantages of high denitrification potential and low operating cost, and has important application prospects for the treatment of high ammonia nitrogen wastewater.

During the whole process of autotrophic denitrification process, it is difficult to achieve a dynamic match between the concentration of DO in wastewater and the change of ammonia nitrogen concentration, and there are problems such as long start-up period, imbalanced flora structure, and unstable operation. During continuous flow operation, the functional flora in the reaction unit often tends to wash out of the reactor, which further exacerbates the above problems.

Chinese Patent Publication No. CN107188307A, titled as an integrated wastewater denitrification device and a wastewater denitrification method, the application discloses an integrated wastewater denitrification device and a wastewater denitrification method. The device provided by the invention has a simple structure and good stability and recovery. In the invention, the main body of the reactor adopts nitrifying bacteria and low-activity flocculent anammox sludge, and the growth and activity of the nitrifying bacteria are selectively inhibited by intermittently adding a certain concentration of hydroxylamine and/or hydrazine for a long time. At the same time, the activities of ammonia oxidizing bacteria and anaerobic ammonia oxidizing bacteria are promoted; the reactor adopts the operation mode of sequencing batch reactor, and the dilution of the influent containing high concentration ammonia nitrogen is realized by adjusting the drainage ratio, so that the concentration of the substrate in the reactor is Within a suitable range, it will not cause inhibition of short-range nitrification and anammox, improve the phenomenon of nitrate accumulation, and quickly restore the denitrification effect of the reactor. However, this kind of device belongs to the batch operation mode and cannot realize continuous water inflow; in order to improve the system operation performance, it is necessary to add metabolite intermediates hydroxylamine and/or hydrazine, which is not conducive to saving costs; due to the performance inhibition of batch operation, sludge is caused When the settling performance is reduced, the settling time is prolonged and the sludge is easily washed out.

SUMMARY OF THE INVENTION

In view of this, the present invention overcomes the shortcomings of the current batch operation mode that cannot continuously feed water, prolongs the sedimentation time and easily washes out the sludge when the performance inhibition causes the sludge sedimentation performance to decrease, and provides a high-ammonia nitrogen autotrophic denitrification. The device does not need to add additional metabolic intermediates and can effectively retain sludge.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions:

A high-ammonia nitrogen autotrophic denitrification device, comprising a reactor body, the reactor body including a reaction zone, a precipitation zone and a gas outlet zone in sequence from bottom to top:

The reaction zone includes a plurality of aeration chambers formed by a number of semi-open baffles and baffles, the fixed ends of the baffles and baffles are oppositely arranged on the inner wall of the reactor body, and the baffles and baffles are arranged at intervals, An aeration pipe is arranged in the aeration chamber on one side of the partition plate, and a water inlet for water inlet is arranged at the bottom of the reaction zone;

A three-phase separator is arranged between the precipitation zone and the gas outlet zone. The three-phase separator is two fenders inclined downward. The gap between the two fenders and the gap between the fender and the reactor body are formed overcurrent channel;

The air outlet area is provided with a water outlet for water outlet.

The sewage to be treated enters from the water inlet at the bottom, and undergoes microbial treatment through several aeration chambers formed by baffles and baffles. The guide plates and the partition plates are arranged at intervals, and the guide plates, the partition plates and the guide plates are arranged at intervals. The fixed end of the guide plate is connected to the left side of the reactor body, and the fixed end of the partition plate is connected to the right side of the reactor body, and the lengths of both are larger than the radius of the reactor body. Adjacent baffles and baffles form an aeration chamber. Due to the arrangement of baffles and deflectors, the sewage must rise in an "S" shape and pass through the aeration chamber as much as possible. The ventilation rate of the aeration pipes on one side of the partition decreases sequentially from bottom to top, thereby forming a high aeration chamber, a medium aeration chamber and a low aeration chamber. The aeration chamber on one side of the deflector is not provided with an aeration pipe, forming a non-aeration chamber with a low oxygen content inside, which is suitable for anaerobic ammonia oxidation (Anammox) bacterial reproduction. The water flow passes through the high aeration chamber, the non-aeration chamber, the middle aeration chamber, the non-aeration chamber, and the low aeration chamber in turn. Compared with dividing it into two sections, the gradient setting has the following advantages: After the ammonia nitrogen is converted into nitrous nitrogen, the nitrous nitrogen can be converted into nitrogen for removal in time, instead of continuing to exist in the sewage, so as to avoid the accumulation of nitrite nitrogen and inhibit the microbial activity of the system; The nitrite-oxidizing bacteria that converts nitrite into nitrate form are eluted, and the bacteria are in a similar niche to ammonia-oxidizing bacteria. The population of this bacterium is reduced and eliminated by several passes through a low-oxygen, no-aeration zone. The sewage flowing out of the reaction zone rises to the sedimentation zone, and the volume in the reaction zone is much larger than the flow cross-sectional area separated by the baffle and the deflector in the reaction zone, and the water flow speed is gentle, which is conducive to sludge precipitation. The top of the sedimentation area is a three-phase separator, and the fenders of the three-phase separator are combined into fine holes that leave only the left and right sides and the middle for exhaust and drainage.

Preferably, the reactor body is connected with a liquid storage tank through the water inlet, the liquid storage tank is arranged on an elastic platform, and the elastic platform includes an elastic member and a platform plate connected to the movable end of the elastic member.

The above technical solution is to solve the problem that the water inlet is arranged at the bottom, either the liquid level of the liquid storage tank must be higher than the liquid level of the reactor body, or it must be pumped in by a pump. However, these two methods have inconveniences. The flow rate of the former will change with the decrease of the liquid level difference. This device adopts biological denitrification, in order to reduce the input material and energy as much as possible for environmental protection, and in order to maximize the equipment as much as possible. The water treatment capacity needs to correspond to a high-precision pump body, and the pump body that can pump out the required flow rate requires too high precision, which is not suitable for promotion. The liquid storage tank is set on the elastic platform. When the liquid volume in the liquid storage tank is large, the weight is large, and the elastic platform is pressed to make it descend. The water pressure at the water inlet becomes smaller, the flow rate is slow, and the amount of sewage brought in When the sewage gradually flows into the reactor body, the weight of the liquid storage tank decreases, and it gradually rises under the action of the elastic platform. The above design is simple, efficient and environmentally friendly.

Preferably, the fixed end of the elastic piece is fixedly connected to the lift plate, the lift plate is threadedly connected with a threaded rod, and the end of the threaded rod is provided with an adjustment handle.

For liquid storage tanks and reactor bodies of different sizes, in order to maintain the difference in liquid level, an adjustable lifting device is provided to ensure that liquid storage tanks and reactor bodies of different volumes can be adapted to improve adaptability.

Preferably, an air outlet is provided in the aeration chamber. The redundant gas introduced in the corresponding aeration pipe will be discharged through the air outlet to prevent the gas from accumulating under the baffle and baffle and dissolving in the liquid.

Preferably, the reactor body is provided with an overflow weir at the water outlet, and the overflow weir is surrounded by a flange that is arranged on the inner wall of the reactor and is turned toward the center of the reactor.

The overflow weir adjusts the hydraulic flow state of the outflow water, dissipates energy, and prevents the sludge outflow water from accumulating in the overflow weir to a certain extent, and then flows out from the overflow weir from the outlet.

Preferably, the reactor body is inclined in the precipitation zone, and the angle of the inclination is between 120° and 175°.

The side walls of the reactor body are inclined in the settling zone, on which the settled sludge will settle.

Preferably, the flow passage is provided with a flow plate, and the flow plate is provided with a small hole, and the diameter of the small hole is 5 to 10 mm. The above structure realizes that the flow plate further improves the effect of separating the generated sludge.

Preferably, the volume ratio of the reaction zone, the precipitation zone and the gas outlet zone is 5-10:2-4:1. In the structure, the sedimentation zone is the largest, and the water flow velocity is the slowest, which is most conducive to sedimentation.

Preferably, the bottom of the reaction zone is provided with a mud discharge hole. The sludge discharge hole removes part of the sludge produced in the reaction zone to prevent it from accumulating in the reactor body.

Preferably, the platform plate is provided with a number of lifting guide holes near the outer edge, the lifting plate is provided with corresponding lifting guide rods, and the lifting guide rods are inserted into the corresponding lifting guide holes one by one. The above-mentioned lifting guide holes and the lifting guide rods cooperate to prevent the platform plate from being deflected relative to the bottom.

Compared with the prior art, the present invention has the following beneficial effects: (1) realizing adaptive oxygen supply through DO segmental regulation, providing adaptation conditions for different functional bacteria, and improving the denitrification performance of the system; (2) effectively reducing the biological efficiency of the system (3) The liquid storage tank is set on the elastic platform to dynamically adjust the liquid level difference, and then adjust the water inlet and outlet rate and water pressure, so that the denitrification performance of the system can be maintained. Stable and efficient.

Description of drawings

Fig. 1 is the schematic diagram of the reactor body of the present invention;

Fig. 2 is the schematic diagram on the liquid storage tank of the present invention and its elastic platform;

In the picture:

Reaction device body 1, water inlet 2, reaction zone 3, high aeration zone 31, medium aeration zone 32, low aeration zone 33, non-aeration zone 34, precipitation zone 4, gas outlet zone 5, flow passage 6, Mud discharge hole 10, overflow weir 11, water outlet 12, three-phase separator 13, deflector 71, baffle 72, air outlet 81, aeration pipe 9, liquid storage tank 10, elastic member 101, platform plate 102 , lift plate 103, threaded rod 104, lift guide rod 105.

Detailed ways

Below by specific embodiment, and in conjunction with accompanying drawing, the technical scheme of the present invention is further described in detail:

Example:

A high ammonia nitrogen autotrophic denitrification device, as shown in Figure 1, includes a reaction device body 1, and the reaction device body 1 sequentially includes a reaction zone 3, a precipitation zone 4 and a gas outlet zone 5 from bottom to top: the reaction zone includes several semi-open The aeration chamber is formed by separating the baffle plate and the baffle plate, the fixed ends of the baffle plate and baffle plate are oppositely arranged on the inner wall of the reaction device body 1, the baffle plate 71 and the baffle plate 72 are arranged at intervals, and the baffle plate one An aeration tube 9 is arranged in the aeration chamber on the side, and a water inlet 2 for water inlet is arranged at the bottom of the reaction zone; a three-phase separator 13 is arranged between the precipitation zone 4 and the gas outlet zone 5, and the three-phase separator 13 is: The two inclined downward fenders, the gap between the two fenders and the gap between the fenders and the reaction device body 1 form a flow passage 6; the air outlet area 5 is provided with a water outlet 12 for water outlet.

The sewage to be treated enters from the water inlet 2 at the bottom and flows out from the drain 12 at the top. Microbial treatment is carried out through several aeration chambers formed by baffles and baffles. The guide plates and the partition plates are arranged at intervals, and the guide plates, the partition plates and the guide plates are arranged at intervals. The fixed end of the guide plate is connected to the left side of the reaction device body 1 , and the fixed end of the partition plate is connected to the right side of the reaction device body 1 , and the lengths of both are larger than the radius of the reaction device body 1 . Adjacent baffles and baffles form an aeration chamber. Due to the arrangement of baffles and deflectors, the sewage must rise in an "S" shape and pass through the aeration chamber as much as possible. The aeration pipes 9 on one side of the baffle plate decrease the ventilation rate sequentially from bottom to top, thereby forming a high aeration zone 31 , a middle aeration zone 32 and a low aeration zone 33 . The aeration chamber on one side of the deflector is not provided with an aeration pipe, forming a non-aeration zone 34 with a lower oxygen content, which is suitable for anaerobic ammonium oxidation (Anammox) bacterial reproduction. Water passes through the high-aeration zone 31, the non-aeration zone 34, the middle-aeration zone 32, the non-aeration zone 34, and the low-aeration zone 33. Compared with dividing it into two sections, such a gradient setting has the following characteristics: Advantages: After the ammonia nitrogen in the water is converted into nitrous nitrogen, the nitrite nitrogen can be converted into nitrogen gas in time for removal, instead of continuing to exist in the sewage to inhibit microbial activity; the liquid can be quickly switched between high oxygen content and low oxygen content. , eluting nitrite oxidizing bacteria that convert nitrite to nitrate form, which have a similar ecological niche to ammonia oxidizing bacteria. The population of this bacterium is reduced and eliminated by several passes through a low-oxygen, no-aeration zone. The sewage flowing out of the reaction zone rises to the sedimentation zone 4. The volume in the reaction zone 3 is much larger than the flow cross-sectional area separated by the baffle and the deflector in the reaction zone 3, and the water flow speed is gentle. Organics will settle here. The top of the sedimentation zone 4 is a three-phase separator 13, and the fenders of the three-phase separator 13 are combined to form a flow passage with only the left and right sides and the middle left for exhaust and drainage.

As shown in FIG. 2 , the reaction device body 1 is connected with a liquid storage tank 10 through a water inlet. The liquid storage tank 10 is arranged on an elastic platform. The elastic platform includes an elastic member 101 and a platform plate connected to the movable end of the elastic member 101 102.

The above reactor is set on the elastic platform to minimize the input of materials and energy for environmental protection. This method should be adopted when the biological reaction speed is relatively slow in the start-up stage or the system operating load is not high. The liquid storage tank 10 is arranged on the elastic platform. When the liquid volume in the liquid storage tank 10 is large, the weight is large, and the elastic platform is pressed to make it descend. When the sewage gradually flows into the reaction device body 1, the weight of the liquid storage tank 10 decreases, and gradually rises under the action of the elastic platform, the liquid level is maintained, the liquid level difference changes little, and the flow rate changes slow. The above design is simple, efficient and environmentally friendly.

The fixed end of the elastic member 101 is fixedly connected to the lift plate 103, the lift plate 103 is threadedly connected with a threaded rod 104, and the end of the threaded rod 104 is provided with an adjustment handle.

For the liquid storage tanks 10 and the reaction device body 1 of different sizes, in order to maintain the difference in liquid level, an adjustable lifting device is provided to ensure that the liquid storage tanks 10 and the reaction device main body 1 of different sizes can be adapted, which improves the adaptability. .

Preferably, an air outlet 81 is provided in the aeration chamber. Correspondingly, the gas introduced into the aeration pipe 9 will be led out through the gas outlet 81, so as to prevent the gas from accumulating under the partition plate and the baffle and dissolving in the liquid. The main body 1 of the reaction device is provided with an overflow weir 11 at the water outlet 12, and the overflow weir 11 is surrounded by a flange that is arranged on the inner wall of the reactor and is turned over toward the center of the reactor. At the same time, the nitrogen gas generated by the reaction also leaves through the gas outlet 81 . The gas outlet is provided with a semi-permeable membrane for separating gas and liquid or other valve bodies for separating gas and liquid.

The overflow weir 11 adjusts the hydraulic flow state of the outflowing water, dissipates energy, and the water first accumulates in the overflow weir 11 , and then flows out of the overflow weir 11 from the water outlet 12 . The reaction device body 1 is inclined in the precipitation zone 4, and the angle of the inclination is between 120° and 175°.

The side wall of the reaction device body 1 is inclined in the sedimentation zone 4, and the sedimented sludge will settle on the side wall. The flow passage 6 is provided with a flow plate, and the flow plate is provided with small holes, and the diameter of the small holes is 5 to 10 mm. The above structure realizes that the flow plate further improves the effect of separating the generated sludge.

Preferably, the volume ratio of the reaction zone, the precipitation zone 4 and the gas outlet zone 5 is 5-10:2-4:1. In the structure, the sedimentation zone 4 is the largest, and the water flow velocity is the slowest, which is most conducive to sedimentation. The bottom of the reaction zone is provided with a mud discharge hole 10 . The sludge discharge hole 10 removes part of the sludge produced in the reaction zone, so as to prevent a large amount of sludge from accumulating in the main body 1 of the reaction device. The platform plate 102 is provided with a plurality of lift guide holes near the outer edge, and the lift plate 103 is provided with corresponding lift guide rods 105, and the lift guide rods 105 are inserted into the corresponding lift guide holes one by one. The above-mentioned lifting guide holes and the lifting guide rods 105 cooperate to prevent the platform plate 102 from being deflected relative to the bottom.

The above-mentioned embodiments are only the preferred solutions of the present invention, and do not limit the present invention in any form. There are other variations and modifications under the premise of not exceeding the technical solutions recorded in the claims.

Claims (10)

1. a high ammonia nitrogen autotrophic denitrification device, comprising a reactor body, it is characterized in that, the reactor body comprises reaction zone, precipitation zone and gas outlet zone successively from bottom to top: The reaction zone includes a plurality of aeration chambers formed by a number of semi-open baffles and baffles, the fixed ends of the baffles and baffles are oppositely arranged on the inner wall of the reactor body, and the baffles and baffles are arranged at intervals, An aeration pipe is arranged in the aeration chamber on one side of the partition plate, and a water inlet for water inlet is arranged at the bottom of the reaction zone; A three-phase separator is arranged between the precipitation zone and the gas outlet zone. The three-phase separator is two fenders inclined downward. The gap between the two fenders and the gap between the fender and the reactor body are formed overcurrent channel; The air outlet area is provided with a water outlet for water outlet. 2. A high-ammonia nitrogen autotrophic denitrification device according to claim 1, wherein the reactor body is communicated with a liquid storage tank through the water inlet, and the liquid storage tank is arranged on an elastic platform, and the elastic platform comprises elastic piece and a platform plate connected to the movable end of the elastic piece. 3. A high-ammonia nitrogen autotrophic denitrification device according to claim 2, wherein the fixed end of the elastic member is fixedly connected to the lifting plate, the lifting plate is threadedly connected with a threaded rod, and the end of the threaded rod is provided with an adjustment handle. 4 . The high ammonia nitrogen autotrophic denitrification device according to claim 1 , wherein an air outlet is provided in the aeration chamber. 5 . 5. a kind of high ammonia nitrogen autotrophic denitrification device according to claim 1, is characterized in that, the reactor body is provided with overflow weir at the water outlet, and described overflow weir is arranged on the inner wall of the reactor, to the reaction It is surrounded by a flange that is turned in the direction of the center of the device. 6. The high ammonia nitrogen autotrophic denitrification device according to any one of claims 1 to 5, wherein the reactor body is inclined in the precipitation zone, and the angle of the inclination is between 120° and 175°. . 7. The high-ammonia nitrogen autotrophic denitrification device according to claim 1, wherein a flow plate is provided on the flow passage, and a small hole is provided on the flow plate, and the diameter of the small hole is 5 to 10 mm. 8. A kind of high ammonia nitrogen autotrophic denitrification device according to claim 7, is characterized in that, the volume ratio of described reaction zone, precipitation zone and gas outlet zone is 5～10:2～4:1. 9 . The high ammonia nitrogen autotrophic denitrification device according to claim 1 , wherein a mud discharge hole is provided at the bottom of the reaction zone. 10 . 10. A high-ammonia nitrogen autotrophic denitrification device according to claim 3, wherein the platform plate is provided with several lifting guide holes near the outer edge, the lifting plate is provided with corresponding lifting guide rods, and the lifting guide rods They are inserted into the corresponding lifting guide holes one by one.

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