Anaerobic ammonia oxidation reaction device

Abstract

The application provides an anaerobic ammonia oxidation reaction device, relates to the technical field of sewage treatment, and is used for solving the problems of serious sludge loss, poor quality of granular sludge and low denitrification efficiency in related art wastewater treatment technology. The reaction device comprises a reaction tank and a stirring unit arranged in the reaction tank, the reaction tank is provided with anaerobic ammonia oxidation microorganisms, the stirring unit comprises an airflow stirring unit and a hydraulic stirring unit, the airflow stirring unit comprises an aeration mechanism arranged in the reaction tank, and the first end of the aeration mechanism is connected with a gas discharge device; the hydraulic stirring unit comprises a water distribution pipe, the water distribution pipe is arranged above the aeration mechanism along the height direction of the reaction tank, a plurality of water outlets are arranged on the water distribution pipe, the first end of the water distribution pipe is connected with a water pump, and the water outlets are directed to the side of the tank opening of the reaction tank. The uniformity in the mixing process of anaerobic ammonia oxidation granular sludge and the mass transfer efficiency are improved, and the quality of the granular sludge and the denitrification efficiency of the wastewater treatment are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, and particularly relates to an anaerobic ammonia oxidation reaction device. BACKGROUND

[0002] The anaerobic ammonia oxidation process is an important technology in wastewater denitrification, which can directly convert ammonia nitrogen into nitrogen gas, realizing natural nitrogen cycle. Compared with the traditional nitrification / denitrification process, the anaerobic ammonia oxidation process can reduce oxygen consumption, carbon source addition, alkalinity consumption, residual sludge and carbon dioxide production, saving operation cost and land area.

[0003] The biological reaction process of the anaerobic ammonia oxidation process includes: ① short-range nitration: about 53% of ammonia nitrogen is oxidized into nitrite nitrogen by nitration bacteria (Ammonia-Oxidizing Bacteria, abbreviated as AOB), wherein the oxygen consumption of this step is 0.75 mol O2 / mol NH4+-N; ② anaerobic ammonia oxidation: 53% of nitrite nitrogen and the remaining 47% of ammonia nitrogen are converted into nitrogen by anaerobic ammonia oxidation bacteria (Anaerobic Ammonia-Oxidizing Bacteria, abbreviated as AAOB), wherein this step does not consume oxygen. The denitrification sludge is a specific type of sludge or biological flocculation formed in the reaction tank in the anaerobic ammonia oxidation process, which is a high-efficiency denitrification microorganism in the anaerobic ammonia oxidation process. The two-layer structure formed by the growth of the granular sludge, the nitration bacteria form a protective film on the outside of the denitrification sludge particles, which can protect the anaerobic ammonia oxidation bacteria from oxygen, and the nitration bacteria consume oxygen before it is transmitted to the anaerobic ammonia oxidation bacteria. The granular sludge has excellent settling performance, can retain a large amount of biological population, has strong resistance to impact, can effectively solve the dilemma of sludge loss, and has strong adaptability to complex environmental conditions. With the proliferation of the granular sludge, the total amount of sludge increases, and insufficient stirring intensity causes the granular sludge to deposit between the reactor tank bottom and the aeration disc, gradually forming an anaerobic zone, the sludge activity is inhibited, the sludge quality gradually deteriorates, and the denitrification efficiency decreases.

[0004] In the related art, in the one-stage anaerobic ammonia oxidation process, the sludge-water mixing stirring mode includes mechanical stirring and airflow stirring. The mechanical stirring is to stir the wastewater, waste sludge and other treatment media by using a mechanical stirring device, and the stirring intensity is high. The airflow stirring is usually to use a microporous aerator or a jet aerator for stirring treatment, so as to provide oxygen for the aerobic ammonia oxidation bacteria (AOB) and mix the sludge and water.

[0005] However, the intensity of the mechanical stirring in the related art is too large, and there is a problem of sludge breakage and loss. In the airflow stirring, the microporous aerator has low sludge-water mixing and mass transfer efficiency, the quality of the granular sludge is poor, and the denitrification efficiency is low. SUMMARY

[0006] In view of the above technical problems, the present application provides an anaerobic ammonia oxidation reaction device, compared with the mechanical stirring and airflow stirring mode of the related art, the airflow stirring and hydraulic stirring mode is adopted, the mixing efficiency of the anaerobic ammonia oxidation granular sludge is strengthened, the uniformity and mass transfer efficiency in the mixing process of the anaerobic ammonia oxidation granular sludge are improved, and the quality of the granular sludge and the denitrification efficiency of the wastewater treatment are improved.

[0007] Specifically, the present application provides the following technical solutions:

[0008] The present application provides an anaerobic ammonia oxidation reaction device for treating nitrogen-containing wastewater, which comprises a reaction tank and a stirring unit arranged in the reaction tank, the reaction tank has anaerobic ammonia oxidation microorganisms, the stirring unit comprises an airflow stirring unit and a hydraulic stirring unit, the airflow stirring unit comprises an aeration mechanism arranged in the reaction tank, a first end of the aeration mechanism is communicated with a gas discharge device to deliver gas for release into the reaction tank to the aeration mechanism to perform airflow stirring on the granular sludge formed by the anaerobic ammonia oxidation microorganisms in the reaction tank.

[0009] The hydraulic stirring unit comprises a water distribution pipe, along the height direction of the reaction tank, the water distribution pipe is arranged above the aeration mechanism, a plurality of water outlets are arranged on the water distribution pipe, a first end of the water distribution pipe is communicated with a water pump, the water outlets are directed to the side of the tank opening of the reaction tank, and the water pump is configured to pump water for hydraulic stirring of the granular sludge through the water outlets.

[0010] As a possible implementation, the aeration mechanism comprises a gas distribution pipe and a microporous aerator, the microporous aerator is mounted on the gas distribution pipe, the microporous aerator has a plurality of micropores communicated with the lumen of the gas distribution pipe, and the plurality of micropores are directed to the tank opening of the reaction tank.

[0011] As a possible implementation, the distance between the microporous aerator and the bottom of the reaction tank is 200-500 mm.

[0012] Preferably, the microporous aerator is a disc aerator, and a plurality of disc aerators are arranged at intervals on the wall of the gas distribution pipe.

[0013] As a possible implementation, the airflow stirring unit further comprises a perforated pipe, along the height direction of the reaction tank, the perforated pipe is arranged between the bottom of the reaction tank and the microporous aerator, the perforated pipe is communicated with the gas discharge device, a plurality of gas outlets are arranged on the perforated pipe, and the gas outlets are directed to the bottom side of the reaction tank to discharge airflow for stirring the granular sludge located below the microporous aerator.

[0014] As a possible implementation, the plurality of exhaust holes are arranged on opposite side walls of the perforated pipe along a radial direction of the perforated pipe and are spaced along an axial direction of the perforated pipe, and an included angle a between any two adjacent exhaust holes along the radial direction of the perforated pipe is 90-180°, preferably 90-135°.

[0015] As a possible implementation, a spacing d between any two adjacent exhaust holes along the axial direction of the perforated pipe is 50-300 mm; preferably, a hole diameter r of the exhaust hole is 5-30 mm.

[0016] As a possible implementation, the water outlet hole is arranged on opposite side walls of the water distribution pipe along a radial direction of the water distribution pipe, and an included angle β between any two adjacent water outlet holes is 90-180°, preferably 90-135°.

[0017] As a possible implementation, a spacing D between any two adjacent water outlet holes along the radial direction of the water distribution pipe is 50-500 mm; preferably, a hole diameter R of the water outlet hole is 10-30 mm.

[0018] As a possible implementation, the reaction device further comprises a valve assembly, the valve assembly comprising a first control valve, a second control valve and a third control valve, the gas discharge device being an aeration blower, the first control valve being arranged on a pipeline connecting the aeration blower and the gas distribution pipe, the second control valve being arranged on a pipeline connecting the aeration blower and the perforated pipe, and the third control valve being arranged on a pipeline connecting the water pump and the water distribution pipe.

[0019] The first control valve and the second control valve are respectively used to regulate and control the air volume of the gas discharge device to the micro-porous aerator and the perforated pipe; and the third control valve is used to regulate and control the delivery flow of the water pump to the water distribution pipe.

[0020] As a possible implementation, a plurality of the perforated pipes and a plurality of the gas distribution pipes are arranged on a bottom of the reaction tank, and the perforated pipes and the gas distribution pipes are staggered along a width direction of the bottom, and each of the gas distribution pipes is arranged between every two adjacent perforated pipes.

[0021] The present application at least has the following advantages:

[0022] This invention employs a combination of airflow agitation and hydraulic agitation. The airflow agitation unit combines a microporous aerator and a perforated pipe. The microporous aerator has high oxygen dissolution efficiency, saving power consumption. The perforated pipe, located between the microporous aerator and the bottom of the reactor, not only provides strong agitation but also features vent holes. The included angle α between any two adjacent vent holes along the radial direction of the pipe is controlled between 90° and 180°, which efficiently agitates the granular sludge deposited below the microporous aerator without breaking the sludge, resulting in excellent mud-water mixing.

[0023] The wastewater inlet pipe in the reaction tank is a distribution pipe, which is installed above the microporous aerator and connected to the water pump. It can use the kinetic energy of the water pump to generate strong hydraulic stirring towards the tank opening, so as to achieve effective mud-water mixing and mass transfer efficiency, creating favorable conditions for the anaerobic ammonia oxidation reaction process. The water pump can be used to pump nitrogen-containing wastewater.

[0024] Airflow mixing combined with hydraulic mixing can effectively enhance the mixing effect of anaerobic ammonia oxidation granular sludge, making the sludge concentration uniform at different liquid levels in the reaction tank. The upward hydraulic flushing effect can also better form granular sludge, thus improving the quality of anaerobic ammonia oxidation granular sludge. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the anaerobic ammonia oxidation reactor provided in an embodiment of the present invention;

[0026] Figure 2 for Figure 1 A top view of the aeration pipe and water distribution pipe;

[0027] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure of the aeration pipe;

[0028] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure of the water pipe;

[0029] Figure 5 In order to show Figure 1 Top view of the hydraulic mixing unit and the airflow mixing unit;

[0030] Figure 6 for Figure 1 A schematic diagram of the side view structure;

[0031] Figure 7 The ammonia nitrogen removal rate and total ammonia nitrogen removal curves of the wastewater in the pre-reaction tank of the anaerobic ammonia oxidation reactor provided in the embodiments of the present invention are shown.

[0032] Figure 8The wastewater ammonia-nitrogen removal rate and ammonia-nitrogen total amount removal curve of the post-reaction tank of the anaerobic ammonia oxidation reaction device provided by the embodiment of the application;

[0033] Figure 9 The particle sludge physical appearance adopted by the front anaerobic ammonia oxidation reaction tank of the application;

[0034] Figure 10 The particle sludge physical appearance adopted by the post-reaction tank of the anaerobic ammonia oxidation reaction device provided by the embodiment of the application;

[0035] Figure 11 The physical appearance of the sludge-water mixture containing particle sludge adopted by the post-reaction tank of the anaerobic ammonia oxidation reaction device provided by the embodiment of the application.

[0036] Explanation of reference signs:

[0037] 100 - reaction tank;

[0038] 110 - gas flow stirring unit;

[0039] 111 - aeration mechanism;

[0040] 1111 - gas distribution pipe; 1112 - micro-porous aerator; 1113 - micro-porous aerator support;

[0041] 112 - gas discharge device;

[0042] 113 - perforated pipe;

[0043] 1131 - exhaust hole; 1132 - perforated pipe support;

[0044] 114 - micro-porous aeration air pipe;

[0045] 115 - perforated aeration air pipe;

[0046] 120 - hydraulic stirring unit;

[0047] 121 - water distribution pipe; 1211 - water outlet hole; 1212 - water distribution pipe support;

[0048] 122 - water pump;

[0049] 200 - valve assembly;

[0050] 210 - first control valve; 220 - second control valve; 230 - third control valve;

[0051] 300 - particle sludge sedimentation module; 310 - water outlet pipe; 320 - water inlet pipe;

[0052] 400 - sampling pipe. DETAILED DESCRIPTION

[0053] As described in the background, anaerobic ammonia oxidation process is an important technology in wastewater denitrification, which can directly convert ammonia nitrogen into nitrogen, realizing natural nitrogen cycle. In the related art one-stage anaerobic ammonia oxidation process, mechanical stirring and airflow stirring are used for sludge-water mixing. However, the process in the related art has problems of sludge loss, poor quality of granular sludge and low denitrification efficiency.

[0054] The inventor found that the reason for the above problems is that the mechanical stirring in the related art is too strong, which easily causes the granular sludge to break and disintegrate, and it is difficult to granulate. In the airflow stirring, the installation distance of the microporous aerator from the bottom of the reactor is relatively high, about 30 cm or more, and the specific gravity of the granular sludge is greater than that of water. Therefore, the granular sludge is easily deposited below the microporous aerator to form an anoxic environment, which cannot effectively mix and mass transfer, resulting in a decrease in denitrification efficiency.

[0055] To solve the above technical problems, the anaerobic ammonia oxidation reaction device provided by the embodiments of the present application adopts a combination of airflow stirring and hydraulic stirring. The airflow stirring unit adopts a combination of a microporous aerator and a perforated pipe. The microporous aerator has high oxygen dissolving efficiency and can save power consumption. The perforated pipe arranged between the microporous aerator and the bottom of the reactor not only has high stirring intensity, but also has gas discharge holes. The opening angle a between any two adjacent holes in the radial direction of the pipe is controlled to be 90-180°, which can efficiently stir the granular sludge deposited below the microporous aerator without cutting and breaking the sludge, and has good sludge-water mixing effect.

[0056] The exemplary embodiments will be described in detail below with reference to the accompanying drawings. In the following description, the same numbers refer to the same elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not representative of all embodiments consistent with the present application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the present application as detailed in the appended claims.

[0057] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0058] The present application is described in detail below by specific examples, and the manufacturers of raw materials and equipment used in the examples, and the equipment and analysis methods used for product analysis are described as follows: In the present application, non-food raw materials are not involved, and the information of the raw materials used in the examples is shown in Table 1.

[0059] The technical terms involved in the examples are explained as follows:

[0060] Anaerobic ammonia oxidation process: a biological treatment process used in the field of nitrogen removal, which can directly convert ammonia nitrogen into nitrogen gas, and is a link in the natural nitrogen cycle. The biological reaction process consists of two steps: ① short-term nitration: nitration bacteria (AOB) oxidize about 53% of ammonia nitrogen to nitrite nitrogen, and the oxygen consumption of this step is 0.75 mol O2 / mol NH4+-N; ② anaerobic ammonia oxidation: anaerobic ammonia oxidation bacteria (AAOB) convert 53% of nitrite nitrogen and the remaining 47% of ammonia nitrogen into nitrogen gas, and this step does not require oxygen consumption.

[0061] Denitrifying granular sludge: a granular denitrifying sludge aggregate formed during the process of denitrifying bacteria using ammonia as an electron donor and oxidizing ammonia to nitrogen gas by anaerobic ammonia oxidation method using nitrate or nitrite as an electron acceptor.

[0062] Table 1 Raw materials and process equipment used in the examples

[0063]

[0064] In combination Figure 1 The present application provides an anaerobic ammonia oxidation reaction device for treating nitrogen-containing wastewater. The reaction device includes a reaction tank 100 and a stirring unit arranged in the reaction tank 100. The reaction tank 100 contains anaerobic ammonia oxidation microorganisms. The stirring unit includes an airflow stirring unit 110 and a hydraulic stirring unit 120. The airflow stirring unit 110 includes an aeration mechanism 111 arranged in the reaction tank 100. The first end of the aeration mechanism 111 is connected to a gas discharge device 112 for delivering gas to the aeration mechanism 111 to be released into the reaction tank 100, thereby performing airflow stirring on the granular sludge formed by the anaerobic ammonia oxidation microorganisms in the reaction tank 100.

[0065] The hydraulic stirring unit 120 includes a water distribution pipe 121. The water distribution pipe 121 is arranged above the aeration mechanism 111 along the height direction of the reaction tank 100. Exemplarily, in combination Figure 6 , the water distribution pipe 121 is erected above the aeration mechanism 111 by a water distribution pipe support 1212. The water distribution pipe 121 is provided with a plurality of water outlets 1211. The first end of the water distribution pipe 121 is connected to a water pump 122. The water outlets 1211 are directed towards the side of the tank opening of the reaction tank 100. The water pump 122 is configured to pump water for hydraulic stirring of the granular sludge through the water outlets 1211.

[0066] The air flow stirring unit adopts a combination of a microporous aerator and a perforated pipe, the microporous aerator has high oxygen dissolving efficiency and can save power consumption; the perforated pipe arranged between the microporous aerator and the bottom of the reactor tank has large stirring intensity, and the perforated pipe is provided with exhaust holes, the opening included angle α between any two adjacent exhaust holes in the radial direction of the pipe is controlled to be 90°-180°, which can efficiently stir the granular sludge deposited at the lower part of the microporous aerator without cutting and crushing the sludge, and has good sludge-water mixing effect.

[0067] Continue to combine Figure 1 And Figure 6 The reaction tank 100 is communicated with a granular sludge sedimentation module 300, and the two are communicated through a water outlet pipeline 310, that is, the wastewater is first pumped into the granular sludge anaerobic ammonia oxidation reaction tank (the anaerobic ammonia oxidation reaction device provided in the embodiment of the application) by the water pump 122 through the water inlet pipeline 320, and after the anaerobic ammonia oxidation reaction, the water flow is guided to the granular sludge sedimentation module. This module is designed to separate the granular sludge from the water for subsequent treatment in the system.

[0068] In a possible implementation manner, in combination Figure 6 The aeration mechanism 111 includes a gas distribution pipe 1111 and a microporous aerator 1112, the microporous aerator 1112 is installed on the gas distribution pipe 1111, the gas distribution pipe 1111 is communicated with the gas discharge device 112 through a microporous aeration air pipe 114, the microporous aerator 1112 has a plurality of micropores communicated with the lumen of the gas distribution pipe 1111, and the plurality of micropores are directed to the tank opening of the reaction tank 100. Exemplarily, the microporous aerator 1112 is a microporous aeration disc which is erected on the bottom of the reaction tank through a microporous aerator support 1113.

[0069] In other possible embodiments, the distance between the microporous aerator 1112 and the bottom of the reaction tank 100 is 200-500 mm, for example, the distance between the microporous aerator 1112 and the bottom of the reaction tank 100 is 200 mm or 350 mm or 500 mm.

[0070] Preferably, the microporous aerator 1112 is a disc aerator, and a plurality of disc aerators are arranged at intervals on the wall of the gas distribution pipe 1111.

[0071] On the basis of the above-mentioned embodiments, the air flow stirring unit 110 can be further improved to include a perforated pipe 113, which is erected between the bottom of the reaction tank 100 and the microporous aerator 1112 in the height direction of the reaction tank 100, in combination Figure 6The perforated pipe 113 is arranged between the bottom of the reaction tank 100 and the microporous aerator 1112 by the perforated pipe support 1132, and the perforated pipe 113 is communicated with the gas discharge device 112. Further, the perforated pipe 113 is communicated with the gas discharge device 112 through the perforated aeration air pipe 115. The perforated pipe 113 is provided with a plurality of exhaust holes 1131, and the exhaust holes 1131 are arranged on the side wall of the perforated pipe 113 and are distributed along the axial direction of the perforated pipe 113. The opening angle a between any two adjacent exhaust holes 1131 along the radial direction of the perforated pipe 113 is 90°-180°, for example, 90°, 135° or 180°, preferably 90-135°, for example, 112.5°.

[0072] Further, the plurality of exhaust holes 1131 are arranged on the opposite side walls of the perforated pipe 113 along the radial direction of the perforated pipe 113, and are distributed along the axial direction of the perforated pipe 113. The opening angle a between any two adjacent exhaust holes 1131 along the radial direction of the perforated pipe 113 is 90°-180°, for example, 90°, 135° or 180°, preferably 90-135°, for example, 112.5°.

[0073] As a possible implementation, the opening distance d between any two adjacent exhaust holes 1131 along the axial direction of the perforated pipe 113 is 50-300mm, for example, 50mm, 175mm or 300mm; preferably, the opening diameter r of the exhaust hole 1131 is 5-30mm, for example, 5mm, 17.5mm or 30mm.

[0074] In more possible embodiments, the water outlet hole 1211 is arranged on the side wall of the water distribution pipe 121 opposite to the side wall, and the opening angle β between adjacent two water outlet holes 1211 along the radial direction of the water distribution pipe 121 is 90°-180°, for example, 90°, 135° or 180°, preferably 90-135°, for example, 112.5°.

[0075] In some embodiments, the opening distance D between adjacent two water outlet holes 1211 along the radial direction of the water distribution pipe 121 is 50-500mm, for example, 50mm, 275mm or 500mm; preferably, the opening diameter R of the water outlet hole 1211 is 10-30mm, for example, 10mm, 20mm or 30mm.

[0076] On the basis of the above-mentioned embodiments, the reaction device further comprises a valve assembly 200, the valve assembly 200 comprises a first control valve 210, a second control valve 220 and a third control valve 230, the gas discharge device is an aeration blower, the first control valve 210 is arranged on a pipeline communicated between the aeration blower and the gas distribution pipe 1111, the second control valve 220 is arranged on a pipeline communicated between the aeration blower and the perforated pipe 113, and the third control valve 230 is arranged on a pipeline communicated between the water pump 122 and the water distribution pipe 121.

[0077] The first control valve 210 and the second control valve 220 are respectively used for regulating the air volume of the gas discharge device 112 to the microporous aerator 1112 and the perforated pipe 113; and the third control valve 230 is used for regulating the delivery flow of the water pump 122 to the water distribution pipe.

[0078] Optionally, a plurality of perforated pipes 113 and a plurality of gas distribution pipes 1111 are arranged on the bottom of the reaction tank 100, and the perforated pipes 113 and the gas distribution pipes 1111 are staggered along the width direction of the bottom, and each gas distribution pipe 1111 is arranged between every two adjacent perforated pipes 113.

[0079] Further, a plurality of sampling pipes 400 are communicated in the reaction tank 100, so as to sample and detect the sludge and sludge-containing water in the tank.

[0080] The embodiments of the present application at least have the following beneficial effects:

[0081] The embodiments of the present application adopt the combination of airflow stirring and hydraulic stirring, wherein the airflow stirring unit adopts the combination of the microporous aerator and the perforated pipe, the microporous aerator has high oxygen dissolving efficiency and can save power consumption; the perforated pipe arranged between the microporous aerator and the bottom of the reactor tank has large stirring intensity, and the perforated pipe is provided with exhaust holes, the opening angle α between any two adjacent exhaust holes along the radial direction of the pipe is controlled to be 90°-180°, which can efficiently stir the granular sludge deposited at the lower part of the microporous aerator without cutting and crushing the sludge, and has good sludge-water mixing effect.

[0082] The wastewater inlet pipe in the reaction tank adopts the water distribution pipe, which is installed above the microporous aerator and connected with the water pump, can form strong hydraulic stirring towards the side of the tank opening by using the kinetic energy of the water pump, and has effective sludge-water mixing effect and mass transfer efficiency, which creates good conditions for the anaerobic ammonia oxidation reaction process, wherein the water pump can be used for pumping the nitrogen-containing wastewater.

[0083] The gas flow stirring cooperates with the hydraulic stirring to effectively strengthen the mixing effect of the anaerobic ammonia oxidation granular sludge, makes the sludge concentrations at different liquid levels in the reaction tank uniform, and the upward hydraulic flushing effect can also better form the granulated sludge, and improve the quality of the anaerobic ammonia oxidation granular sludge.

[0084] It is verified through experiments that the anaerobic ammonia oxidation reaction device is applied in multiple branches of Angel Yeast at present, the mass transfer efficiency of the anaerobic ammonia oxidation granular sludge in the wastewater treatment reaction tank is higher, the mixing uniformity is better, the quality of the granular sludge and the wastewater denitrification efficiency are higher, and the specific embodiments are illustrated by the following experimental examples. Experimental Example 1: Application of the Anaerobic Ammonia Oxidation Reaction Device in a Branch of Angel Yeast

[0085] The application of the anaerobic ammonia oxidation reaction device was completed in September 2022, and was put into use on September 29, 2022. The granular sludge SV30 of the anaerobic ammonia oxidation reaction tank before and after the application was regularly sampled and detected every week, and the sampling tube heights of 1#-3# were 0.3 m, 3 m and 6.5 m respectively.

[0086] It should be noted that SV30 refers to the case where the sludge volume index (Sludge Volume Index, SVI) of the granular sludge is 30 mL / g. SVI is an index used to describe the settling performance of sludge, which represents the settling performance of sludge in water within a certain time. The unit of SVI is milliliter per gram (mL / g)

[0087] Table 2: Test of the settling performance of the granular sludge

[0088]

[0089] As can be seen from the data in Table 2, the difference between the SV30 of 1# and 3# sampling detection is reduced from 55 ml / L to 5 ml / L after the application of the anaerobic ammonia oxidation reaction device provided in the embodiments of the present application, and the granular sludge concentrations of each hole are more uniform.

[0090] Experimental Example 2: Application of the Anaerobic Ammonia Oxidation Reaction Device in a Branch of Angel Yeast

[0091] On March 27, 2023-April 2, 2023, the anaerobic ammonia oxidation system of a branch of Angel Yeast was shut down for modification, and a large amount of deposited sludge was found during the emptying of the reaction tank. The granular sludge at the bottom changed from red to black, and the granular sludge was broken and disintegrated. After the application of the anaerobic ammonia oxidation reaction device provided in the embodiments of the present application, the ammonia nitrogen removal rate and the total amount of ammonia nitrogen removal were significantly improved after the restart of operation. Specifically, Figure 7 and Figure 8 As can be seen from the curves shown in and, the average value of the ammonia nitrogen removal rate before the application of the anaerobic ammonia oxidation reaction device provided in the embodiments of the present application is 53%, and the average value of the total amount of ammonia nitrogen removal is 144 kg / d. After the application, the average value of the ammonia nitrogen removal rate is 67%, and the average value of the total amount of ammonia nitrogen removal is 303 kg / d.

[0092] Table 3 detects sludge concentration and total sludge

[0093]

[0094] As can be seen from Table 3, the average total sludge before the application of the anaerobic ammonia oxidation reaction device is 1174kg; and the average total sludge after the application is 1212kg.

[0095] Further, in combination with Figure 9 , Figure 10 and Figure 11 , the quality of the granular sludge is poor before the transformation, the color is dark, the granules are broken and disintegrated, and there is a risk of loss; the quality of the granular sludge is improved after the transformation, the color is bright red, the texture is compact, and the granules are uniform.

[0096] However, in the related art, the strength of mechanical stirring is too large, and there are problems, and in air flow stirring, the microporous aerator has low sludge-water mixing and mass transfer efficiency, the quality of the granular sludge is poor, and the denitrification efficiency is low.

[0097] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0098] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0099] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0100] In the present application, unless otherwise explicitly specified and limited, a first feature is "on" or "under" a second feature can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature is "over", "above" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature is "under", "below" and "underneath" the second feature can mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0101] The embodiments or implementations in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the embodiments can be referred to each other.

[0102] It should be noted that the embodiments referred to in the specification as "one embodiment", "an embodiment", "exemplary embodiment", "some embodiments" and the like can include specific features, structures or characteristics, but not necessarily every embodiment includes the specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when a specific feature, structure or characteristic is described in combination with an embodiment, it is within the knowledge of those skilled in the art to realize such feature, structure or characteristic in combination with other embodiments, whether explicitly described or not.

[0103] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An apparatus for anammox reaction, characterized by, The application relates to a reaction device for treating nitrogen-containing wastewater, which comprises a reaction tank and a stirring unit arranged in the reaction tank, the reaction tank is provided with anaerobic ammonia oxidation microorganisms, the stirring unit comprises an airflow stirring unit and a hydraulic stirring unit, the airflow stirring unit comprises an aeration mechanism arranged in the reaction tank, a first end of the aeration mechanism is connected with a gas discharge device, the gas discharge device is used for conveying gas to the aeration mechanism and releasing the gas into the reaction tank to airflow stir granular sludge formed by the anaerobic ammonia oxidation microorganisms in the reaction tank. The hydraulic stirring unit comprises a water distribution pipe, the water distribution pipe is arranged above the aeration mechanism along the height direction of the reaction tank, a plurality of water outlets are arranged on the water distribution pipe, a first end of the water distribution pipe is connected with a water pump, the water outlets are directed to the side of the tank opening of the reaction tank, and the water pump is configured to pump water through the water outlets to hydraulically stir the granular sludge. The aeration mechanism comprises a gas distribution pipe and a microporous aerator, the microporous aerator is mounted on the gas distribution pipe, the microporous aerator is provided with a plurality of micropores connected with the lumen of the gas distribution pipe, and the micropores are directed to the tank opening of the reaction tank. The airflow stirring unit further comprises a perforated pipe, the perforated pipe is arranged between the tank bottom of the reaction tank and the microporous aerator along the height direction of the reaction tank, the perforated pipe is connected with the gas discharge device, the perforated pipe is provided with a plurality of air outlets, the air outlets are directed to the tank bottom side of the reaction tank to discharge airflow for stirring the granular sludge below the microporous aerator, the air outlets are arranged on the opposite two side walls of the perforated pipe along the radial direction of the perforated pipe and are spaced and distributed along the axial direction of the perforated pipe, and the included angle alpha between any two adjacent air outlets along the radial direction of the perforated pipe is 90-135 degrees. A plurality of the perforated pipes and a plurality of the gas distribution pipes are spaced and arranged on the tank bottom of the reaction tank, and the perforated pipes and the gas distribution pipes are staggered and distributed along the width direction of the tank bottom, and each gas distribution pipe is arranged between every two adjacent perforated pipes.

2. The reaction apparatus according to claim 1, wherein The distance between the microporous aerator and the tank bottom of the reaction tank is 200-500 mm.

3. The reaction apparatus of claim 1, wherein The microporous aerator is a disc aerator, and a plurality of the disc aerators are spaced and arranged on the pipe wall of the gas distribution pipe.

4. The reaction apparatus of claim 1, wherein The distance d between any two adjacent air outlets along the axial direction of the perforated pipe is 50-300 mm.

5. The reaction apparatus of claim 4, wherein The diameter r of the air outlet is 5-30 mm.

6. The reaction apparatus of claim 1, wherein The water outlets are arranged on the opposite two side walls of the water distribution pipe along the radial direction of the water distribution pipe, the included angle beta between any two adjacent water outlets is 90-180 degrees.

7. The reaction apparatus of claim 6, wherein The included angle beta between any two adjacent water outlets along the radial direction of the water distribution pipe is 90-135 degrees.

8. The reaction apparatus of claim 6, wherein The distance D between any two adjacent water outlets along the radial direction of the water distribution pipe is 50-500 mm.

9. The reaction apparatus of claim 8, wherein The diameter R of the water outlet is 10-30 mm.

10. The reactor of any of claims 1-9, wherein, The reaction device further comprises a valve assembly, the valve assembly comprising a first control valve, a second control valve and a third control valve, the gas discharge device being an aeration blower, the first control valve being arranged on a pipeline through which the aeration blower and the gas distribution pipe are in communication, the second control valve being arranged on a pipeline through which the aeration blower and the perforated pipe are in communication, and the third control valve being arranged on a pipeline through which the water pump and the water distribution pipe are in communication. The first control valve and the second control valve are respectively used for regulating the air volume of the gas discharge device to the microporous aerator and the perforated pipe, and the third control valve is used for regulating the delivery flow of the water pump to the water distribution pipe.

Images