A sewage advanced denitrification MOBR device and process

Abstract

The application discloses a kind of sewage advanced denitrification MOBR equipment and process, belong to sewage treatment technical field, four groups of reaction pools of matrix distribution, wherein, the inside of the reaction pool is equipped with sewage treatment mechanism, and aeration matrix is equipped at the bottom of sewage treatment mechanism, the sewage treatment mechanism includes MOBR membrane frame and MOBR membrane group installed along the inside circumferential direction of the MOBR membrane frame equidistantly, wherein, the MOBR membrane frame includes: outer ring support, in the outermost side of the inside of the MOBR membrane frame;Inner ring support, set to the inside of the outer ring support;Connecting frame, along the outside circumferential distribution of the inner ring support;Circulating agitator, equipped at the inside bottom of the inner ring support.The application is by using the mode of MOBR sewage treatment, and combines half-way denitrification and anaerobic ammonia oxidation, to realize in the case without carbon source, realize the advanced denitrification of sewage, reduce the processing cost of sewage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, in particular to a sewage deep denitrification MOBR equipment and process. BACKGROUND

[0002] The traditional biochemical process is mainly based on AO or AAO process, and the total nitrogen removal rate of the effluent of the process is generally maintained at about 80%. If the effluent discharge standard is improved to quasi-class IV, i.e. the total nitrogen of the effluent is lower than 10 mg / L, the mainstream biochemical process of many sewage plants cannot meet the discharge requirements, and deep denitrification is required. The traditional deep denitrification of sewage is mainly realized by denitrification filter, but this way of deep denitrification of sewage needs backwashing and external carbon source, so the equipment is complex, the investment is large, the management is cumbersome, and the treatment cost is high. At the same time, in the technology of deep denitrification of sewage by MOBR, the traditional MOBR membrane is flat plate type. The advantage of this design is high space utilization, but the problem is that the sludge in the pool body cannot be fully stirred, and only the gas of MABR membrane wire can be physically agitated, resulting in poor reaction effect. Therefore, the present application provides a sewage deep denitrification MOBR equipment and process. SUMMARY

[0003] The main purpose of the present application is to provide a sewage deep denitrification MOBR equipment and process, which realizes deep denitrification of sewage without adding carbon source by using MOBR sewage treatment mode and combining half denitrification and anaerobic ammonia oxidation, thereby reducing the treatment cost of sewage.

[0004] To achieve the above purpose, the present application provides a sewage deep denitrification MOBR equipment, which comprises four groups of reaction pools in matrix distribution, wherein the inside of the reaction pool is equipped with a sewage treatment mechanism, and the bottom of the sewage treatment mechanism is equipped with an aeration matrix, the sewage treatment mechanism comprises a MOBR membrane rack and a MOBR membrane group installed along the inner circumferential direction of the MOBR membrane rack at equal intervals, wherein the MOBR membrane rack comprises:

[0005] An outer ring support at the outermost side of the inside of the MOBR membrane rack;

[0006] An inner ring support arranged on the inner side of the outer ring support and connected with the outer ring support through the reinforcing ribs at the bottom, the outer side of the inner ring support and the inner side of the outer ring support are fixed with corresponding semicircular limiting clamping groove seats along the circumferential direction of the inner ring support and the outer ring support at equal intervals, and the MOBR membrane group is inserted into the inside of the MOBR membrane rack along the length direction of the semicircular limiting clamping groove seat;

[0007] The connecting frame is distributed along the outer circumference of the inner ring support and is arranged between two adjacent MOBR membrane modules. The bottom of the connecting frame is rotatably connected to auxiliary stirring blades at equal intervals along its length, and the bottom end of the auxiliary stirring blade is connected to a transmission blade facing the air outlet of the aeration matrix;

[0008] The circulating stirrer is assembled on the inner bottom of the inner ring bracket and is driven to rotate by an external driving motor.

[0009] Preferably, the top of one side of the reaction tank is respectively connected with a biochemical effluent pipe and a sewage pipe which are distributed up and down.

[0010] Preferably, the MOBR membrane group includes a symmetrically arranged connecting pipe 1 and a connecting pipe 2, and both ends of the connecting pipe 1 and the connecting pipe 2 are connected to a connecting box, so that the connecting pipe 1, the connecting pipe 2 and the connecting box form a square structure, and MOBR membrane tubes are connected between the two connecting boxes at equal intervals along their length and width directions.

[0011] Preferably, the MOBR membrane tube is formed by combining an inner layer woven from ABR membrane filaments and an outer layer woven from MBR membrane filaments.

[0012] Preferably, the top of the sewage treatment mechanism is equipped with a collecting discharge pipe connected to a connecting pipe provided inside the MOBR membrane group.

[0013] A treatment process for a sewage deep denitrification MOBR device, the treatment process is as follows:

[0014] S1. Raw water and biochemical effluent are first introduced into the first group of reaction tanks in a certain proportion. When the water level of the tank reaches the set water level, the water inflow into the first group of reaction tanks is stopped, and the mixed wastewater is sequentially introduced into the second group of reaction tanks, the third group of reaction tanks, and the fourth group of reaction tanks;

[0015] S2. After the sewage is full, the circulating agitator in the MOBR membrane frame is turned on to achieve sufficient mud and water mixing. At this time, the denitrification reaction of half-way denitrification + anaerobic ammonium oxidation occurs in the sewage. During the reaction process, the pH value rises slowly;

[0016] S3. When the pH value in the sewage changes from rising to falling, the denitrification is completed, and then the MOBR membrane group is used to filter the water and discharge the filtered water, while the aeration matrix is ​​used for aeration;

[0017] S4. When the water level inside the reaction tank drops to the drainage level, the drainage is stopped and new sewage is allowed to enter to enter the next cycle.

[0018] Preferably, the half denitrification is that sludge reacts with organic matter in raw water and nitrate nitrogen in biochemical effluent to generate nitrite nitrogen.

[0019] Preferably, the anaerobic ammonia oxidation is that ammonia nitrogen in raw water and generated nitrite nitrogen react to generate nitrogen and a small amount of nitrate nitrogen.

[0020] The present application has the advantages that: first, in the process of aeration, the airflow sprayed from the air outlet of the aeration matrix drives the transmission blade to rotate, synchronously drives the secondary stirring blade to rotate, and because the secondary stirring blade is located between the adjacent two MOBR membrane groups, in the rotation process of the secondary stirring blade, on the one hand, the mixing effect of the sludge and water mixing between the adjacent two MOBR membrane groups is accelerated, and under the action of centrifugal force in the rotation process of the secondary stirring blade, the sewage is flushed to the position of the MOBR membrane group, so that the impurities adsorbed on the MOBR membrane tube are cleaned under the action of the flushing force when the filtered water is discharged by the MOBR membrane group, preventing the MOBR membrane tube from being blocked, and the water filtered through the MOBR membrane tube directly enters the inside of the connecting box and the connecting pipe two and the connecting pipe one, and the space for storing water is formed by the connecting pipe one and the connecting pipe two and the connecting box, so that the difficulty of pumping water is reduced by the design of the MOBR membrane group.

[0021] Secondly, part of the nitrate nitrogen is contained in the biochemical effluent, and the raw water contains organic matter and ammonia nitrogen, and the two streams are mixed in the reaction tank according to a certain proportion, the proportion is determined by the total nitrogen in the biochemical effluent and the COD in the raw water, and the carbon-nitrogen ratio of the sewage is controlled at about 2 after mixing, and the circulating stirrer is opened after mixing, the sewage first undergoes the half denitrification process, the nitrate nitrogen in the biochemical effluent is reduced to nitrite nitrogen, and then the sewage undergoes the anaerobic ammonia oxidation reaction, realizing the total nitrogen removal of the sewage. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which form a part of the present application, are used to provide further understanding of the present application, and make the other features, purposes and advantages of the present application more apparent. The schematic embodiment drawings of the present application and their descriptions are used to explain the present application, and do not constitute improper limitations on the present application. In the drawings:

[0023] Figure 1 is the overall plan view of the present application.

[0024] Figure 2 is the internal structure schematic view of the reaction tank of the present application.

[0025] Figure 3 is the combined structure schematic view of the MOBR membrane rack and the MOBR membrane group of the present application.

[0026] Figure 4It is a MOBR membrane frame structure schematic diagram of the application.

[0027] Figure 5 It is a MOBR membrane group structure schematic diagram of the application.

[0028] Figure 6 It is a connection frame, secondary stirring blade and transmission blade structure schematic diagram of the application.

[0029] Figure 7 It is a aeration matrix and secondary stirring blade and transmission blade position relationship structure schematic diagram of the application.

[0030] Figure 8 It is Figure 7 The enlarged structure schematic diagram at A in the middle.

[0031] Figure 9 It is the change situation schematic diagram of COD of inlet and outlet water.

[0032] Figure 10 It is the change situation schematic diagram of ammonia nitrogen of inlet and outlet water.

[0033] Figure 11 It is the change situation schematic diagram of nitrate nitrogen and total nitrogen of inlet and outlet water.

[0034] Figure 12 It is the change situation schematic diagram of various pollutant concentrations in a period.

[0035] In the above figure, 100, reaction tank; 101, biochemical effluent connection pipe; 102, sewage connection pipe; 200, MOBR membrane frame; 201, outer ring support; 202, semicircular limiting clamping groove seat; 203, connection frame; 204, circulating stirrer; 205, inner ring support; 206, secondary stirring blade; 207, transmission blade; 300, aeration matrix; 400, MOBR membrane group; 401, connection pipe one; 402, communication box; 403, connection pipe two; 404, MOBR membrane pipe; 500, summary discharge pipe. DETAILED DESCRIPTION

[0036] In order to make the person skilled in the art better understand the application scheme, the technical scheme in the embodiment of the application will be described clearly and completely below in combination with the drawings in the embodiment of the application. Obviously, the described embodiment is only a part of the embodiment of the application, not all. Based on the embodiment in the application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the application.

[0037] It should be noted that the terms "first", "second" and the like in the description and in the claims of the present application and the above-described accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances so as to describe the embodiments of the present application herein. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a list of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to such processes, methods, products or devices.

[0038] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0039] In addition, in addition to indicating the orientation or positional relationship, the above-mentioned partial terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the present application can be understood according to the specific circumstances.

[0040] In addition, the terms "mount", "set", "provided with", "connected", "connected", "sleeved" should be broadly understood. For example, it can be fixedly connected, detachably connected, or integrally constructed; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two devices, elements or components. 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.

[0041] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. Embodiments

[0042] Reference Figures 1-8As shown, this embodiment provides a wastewater deep denitrification MOBR device, including four groups of reaction tanks 100 distributed in a matrix, wherein each of the reaction tanks 100 is equipped with a sewage treatment mechanism, and an aeration matrix 300 is installed at the bottom of the sewage treatment mechanism. The sewage treatment mechanism includes a MOBR membrane frame 200 and a MOBR membrane group 400 installed at equal intervals along the circumferential direction of the MOBR membrane frame 200, wherein the MOBR membrane frame 200 includes:

[0043] The outer ring support 201 is located at the outermost side of the MOBR membrane frame 200;

[0044] The inner ring bracket 205 is arranged on the inner side of the outer ring bracket 201, and the inner ring bracket 205 is connected to the outer ring bracket 201 through the reinforcing ribs at the bottom. The outer side of the inner ring bracket 205 and the inner side of the outer ring bracket 201 are fixed with corresponding semicircular limiting slot seats 202 at equal intervals along the circumferential direction of the inner ring bracket 205 and the outer ring bracket 201, and the MOBR membrane group 400 is inserted into the interior of the MOBR membrane frame 200 along the length direction of the semicircular limiting slot seat 202. When in use, the MOBR membrane group 400 is directly inserted along the semicircular limiting slot seat The positioning card slot 202 is inserted into the interior of the MOBR membrane frame 200. Therefore, when a single MOBR membrane group 400 needs to be replaced, it is only necessary to disconnect the MOBR membrane group 400 to be replaced from the collective discharge pipe 500, and then directly remove the MOBR membrane group 400 from the interior of the MOBR membrane frame 200 along the semicircular limiting card slot 202 to replace the MOBR membrane frame 200. There is no need to lift the entire MOBR membrane frame 200 to replace the MOBR membrane group 400 inside it, thereby greatly reducing the difficulty of replacing the MOBR membrane group 400.

[0045] Connecting frame 203, along the outer circumference of the inner ring support 205 distribution, and is provided between the two adjacent MOBR membrane group 400, the bottom of the connecting frame 203 along its length direction is equidistantly connected with the auxiliary stirring blade 206, and the bottom end of the auxiliary stirring blade 206 is connected with the transmission blade 207 which is opposite to the air outlet position of the aeration matrix 300. In use, in the process of aeration, the airflow sprayed from the air outlet of the aeration matrix 300 will drive the transmission blade 207 to rotate, synchronously driving the auxiliary stirring blade 206 to rotate. Since the auxiliary stirring blade 206 is between the two adjacent MOBR membrane groups 400, in the process of rotation of the auxiliary stirring blade 206, on the one hand, the mixing effect of the mixture between the two adjacent MOBR membrane groups 400 is accelerated, and under the action of centrifugal force in the process of rotation of the auxiliary stirring blade 206, the sewage is flushed to the position of the MOBR membrane group 400, so that the impurities adsorbed on the MOBR membrane tube 404 are cleaned under the action of the flushing force when the filtered water is discharged by the MOBR membrane group 400, preventing the MOBR membrane tube 404 from being blocked;

[0046] Circulating stirrer 204, equipped on the inside bottom of the inner ring support 205, and driven to rotate by the external driving motor. In use, the circulating stirrer 204 in the MOBR membrane frame 200 is opened to achieve sufficient mixing of the sludge and water.

[0047] In this embodiment, the top of one side of the reaction tank 100 is respectively connected with the biochemical effluent pipe 101 and the sewage pipe 102 which are arranged in an up-down manner. In use, the biochemical effluent and raw water are respectively introduced into the inside of the reaction tank 100 through the biochemical effluent pipe 101 and the sewage pipe 102.

[0048] In this embodiment, the MOBR membrane group 400 includes the connecting pipe one 401 and the connecting pipe two 403 which are symmetrically arranged, and the two ends of the connecting pipe one 401 and the connecting pipe two 403 are both connected with the communication box 402, so that the connecting pipe one 401, the connecting pipe two 403 and the communication box 402 form a square structure, and the MOBR membrane tube 404 is connected between the two communication boxes 402 along the length and width directions. In use, the water filtered by the MOBR membrane tube 404 is pumped into the inside of the collection discharge pipe 500 by the suction of the liquid pump, and then introduced into the storage tank. In this process, the water filtered by the MOBR membrane tube 404 directly enters the inside of the communication box 402 and the connecting pipe two 403 and the connecting pipe one 401, so that the difficulty of pumping water is reduced by the design of the MOBR membrane group 400.

[0049] In the embodiment, the MOBR membrane tube 404 is formed by the combination of the inner layer of ABR membrane wire and the outer layer of MBR membrane wire. In use, the alternative weaving of the MBR membrane wire and the ABR membrane wire is beneficial to reduce the clogging of the MOBR membrane tube 404.

[0050] In the embodiment, the top of the sewage treatment mechanism is equipped with a summary discharge pipe 500 which is communicated with the connecting pipe 401 arranged in the MOBR membrane group 400. In use, the water filtered by the MOBR membrane tube 404 is sucked into the summary discharge pipe 500 by the suction of the liquid pump, and then introduced into the storage pool.

[0051] In summary:

[0052] First, the biochemical effluent and raw water are respectively introduced into the inside of the reaction tank 100 through the biochemical effluent connecting pipe 101 and the sewage connecting pipe 102. Then, the sewage in the reaction tank 100 is stirred by the circulating stirrer 204 in the MOBR membrane rack 200, and the sewage in the reaction tank 100 is aerated by the external air source and the aeration matrix 300, so as to realize the sufficient mixing of the sludge and water, accelerate the denitrification reaction in the sewage, and speed up the denitrification reaction in the sewage. In the process of the denitrification reaction, the pH value in the sewage will initially show an upward trend, and then when the pH value in the sewage rises to the inflection point from rising to falling, it means that the denitrification reaction in the sewage is completed, and at the same time, it means that in the process of aeration, the gas flow sprayed from the gas outlet of the aeration matrix 300 drives the transmission blade 207 to rotate, synchronously drives the secondary stirring blade 206 to rotate, and because the secondary stirring blade 206 is located between the adjacent two MOBR membrane groups 400, in the process of rotation of the secondary stirring blade 206, on the one hand, the mixing effect of the mixing of the sludge and water between the adjacent two MOBR membrane groups 400 is accelerated, and under the action of centrifugal force in the process of rotation of the secondary stirring blade 206, the sewage is washed to the position of the MOBR membrane group 400, so as to facilitate the cleaning of the impurities adsorbed on the MOBR membrane tube 404 under the action of the washing force while the water filtered by the MOBR membrane group 400 is discharged, and prevent the MOBR membrane tube 404 from being clogged;

[0053] In this process, by connecting the external suction pump with the summary discharge pipe 500, the water filtered by the MOBR membrane tube 404 is sucked into the summary discharge pipe 500 by the suction force generated by the suction pump, and then introduced into the storage pool. In this process, the water filtered by the MOBR membrane tube 404 directly enters the inside of the connecting box 402 and the connecting pipe two 403 and the connecting pipe one 401, thereby reducing the difficulty of pumping water through the design of the MOBR membrane group 400. It is explained that the existing MOBR membrane group 400 is generally used by the suction force generated by the suction pump acting directly on the inside of the MOBR membrane tube 404, so there is no water storage space of the connecting pipe one 401 and the connecting pipe two 403 and the connecting box 402 in the present application. Therefore, in the prior art, the suction force directly acts on the inside of the MOBR membrane tube 404, which is more likely to cause impurities to be adsorbed on the MOBR membrane tube 404 under the action of the suction force, thereby increasing the difficulty of pumping water by the suction pump over time.

[0054] At the same time, in the present application, the MOBR membrane group 400 is directly inserted into the inside of the MOBR membrane frame 200 along the semicircular limiting clamping groove seat 202, so that when a single MOBR membrane group 400 needs to be replaced, the MOBR membrane group 400 to be replaced is only connected with the summary discharge pipe 500, and then the MOBR membrane group 400 is directly taken out from the inside of the MOBR membrane frame 200 along the semicircular limiting clamping groove seat 202. The MOBR membrane frame 200 can be replaced without lifting the entire MOBR membrane frame 200 to replace the MOBR membrane group 400 inside, thereby greatly reducing the difficulty of replacing the MOBR membrane group 400. It is worth noting that in the present application, the MOBR membrane frame 200 adopts a cylindrical design. Compared with the existing flat plate type MOBR membrane frame 200, the present application increases a circulating stirrer 204 in the middle, which can realize sufficient stirring of sludge in the pool body and completely solve the problem of mud and water stirring, thereby greatly improving the treatment efficiency of sewage. Embodiment

[0055] A sewage deep denitrification MOBR equipment processing process, the processing process is as follows:

[0056] S1, the raw water and the biochemical effluent first enter the inside of the first group of reaction tanks 100 according to a certain proportion. When the water level of the tank reaches the set water level (the set water level is generally 25% of the total effective water level), the water inlet of the first group of reaction tanks 100 stops, and the mixed sewage enters the second group of reaction tanks 100, the third group of reaction tanks 100 and the fourth group of reaction tanks 100 in turn;

[0057] S2. After the sewage is full, the circulating agitator 204 in the MOBR membrane rack 200 is turned on to achieve sufficient mixing of mud and water. At this time, a half-denitrification + anaerobic ammonium oxidation denitrification reaction occurs in the sewage. During the reaction process, the pH value rises slowly. At the same time, an external pH probe is connected to the inside of the reaction tank 100 to monitor the change of the pH value inside the reaction tank 100;

[0058] S3. When the pH value in the sewage is detected to have turned from an upward to a downward inflection point, denitrification is completed, and then the MOBR membrane group 400 is used to filter the water and discharge the filtered water, while the aeration matrix 300 is used for aeration.

[0059] S4: When the water level inside the reaction tank 100 drops to the drainage level, the drainage is stopped and new sewage is waited for to enter, and the next cycle is entered;

[0060] In this example, the semi-denitrification is a process in which the sludge utilizes organic matter in the raw water to react with nitrate nitrogen in the biochemical effluent to generate nitrite nitrogen.

[0061] In this example, the anaerobic ammonium oxidation is a reaction between ammonia nitrogen in the raw water and the generated nitrite nitrogen, ultimately generating nitrogen gas and a small amount of nitrate nitrogen.

[0062] In the present invention, the effect of the process and equipment running for 60 days is as follows: Figure 9 、 Figure 10 and Figure 11 As shown, Figure 9 Indicates the change of inlet and outlet COD: Figure 9 It can be seen that the COD of the raw water is 140-180 mg / L, which is typical for domestic sewage. After treatment, the effluent and biochemical effluent change little and stabilize at around 20 mg / L, which is the typical range of COD for domestic sewage treatment by activated sludge method.

[0063] Figure 10 Changes in ammonia nitrogen in the inlet and outlet water: The ammonia nitrogen concentration in the raw water is between 50-65 mg / L. Through the autotrophic denitrification of anaerobic ammonia oxidation, the total nitrogen concentration in the effluent is slightly higher than that in the original biochemical effluent, but it is also maintained within 1.5 mg / L, meeting the discharge standard for quasi-Class IV water bodies;

[0064] Figure 11 It shows the changes of nitrate nitrogen and total nitrogen in the inlet and outlet water: Since the total nitrogen in the biochemical effluent mainly exists in the form of nitrate nitrogen, the removal of nitrate nitrogen in sewage by MOBR is the main purpose of this invention, and Figure 11It can be seen that the total nitrogen in the biochemical effluent is within 15 mg / L, which meets the Class A discharge standard, but does not meet the quasi-Class IV water body discharge standard of less than 10 mg / L. However, through the reaction of MOBR, the nitrate nitrogen and total nitrogen in the effluent are significantly reduced, maintained below 6 mg / L, achieving a good total nitrogen removal effect.

[0065] At the same time, in one cycle of the present invention, the concentration changes of different pollutants in the MOBR reactor are as follows: Figure 12 As shown by Figure 12 It can be seen that the reaction within a MOBR cycle is mainly divided into three parts: water inlet, stirring reaction stage and drainage stage: in the water inlet stage, the concentrations of COD, ammonia nitrogen and total nitrogen will increase, mainly because the introduced raw water contains these three pollutants. This stage lasts for 30 minutes, and then enters the stirring reaction stage. First, the sewage undergoes short-term denitrification to convert the nitrate nitrogen in the system into nitrite nitrogen, while consuming the organic matter in the sewage. This stage lasts for about 45 minutes. After 45 minutes, the COD in the sewage will be basically stable, indicating that the short-term denitrification is basically completed. At the same time, the sewage will undergo anaerobic ammonia oxidation reaction. The main manifestation of this stage is the continuous decrease of ammonia nitrogen, nitrate nitrogen and total nitrogen in the sewage. This stage lasts for about 105 minutes. By the end of the reaction, the ammonia nitrogen and total nitrogen concentrations of the sewage have dropped to 1.5 mg / L and 3 mg / L respectively, which are significantly lower than the discharge standards for Class IV water bodies. The entire reaction process does not require the addition of any carbon source. The reaction only consumes part of the electricity to ensure the normal operation of the water inlet pump, stirrer and MOBR equipment, so the treatment cost is very low.

Claims

1. A wastewater advanced denitrification MOBR apparatus comprising four groups of reaction tanks (100) in matrix distribution, wherein, The reaction tank (100) is equipped with a sewage treatment mechanism inside, and an aeration matrix (300) is installed at the bottom of the sewage treatment mechanism, characterized in that the sewage treatment mechanism includes a MOBR membrane frame (200) and a MOBR membrane group (400) installed at equal intervals along the inner circumferential direction of the MOBR membrane frame (200), wherein the MOBR membrane frame (200) includes: An outer ring support (201) is located at the outermost side of the MOBR membrane frame (200); An inner ring bracket (205) is arranged on the inner side of the outer ring bracket (201), and the inner ring bracket (205) and the outer ring bracket (201) are connected through a reinforcing rib at the bottom, and semicircular limiting slot seats (202) corresponding to each other are fixed at equal intervals along the circumferential direction of the inner ring bracket (205) and the outer ring bracket (201), and the MOBR membrane group (400) is inserted into the interior of the MOBR membrane frame (200) along the length direction of the semicircular limiting slot seats (202); A connecting frame (203) is distributed along the outer circumference of the inner ring support (205) and is arranged between two adjacent MOBR membrane groups (400). The bottom of the connecting frame (203) is connected to auxiliary stirring blades (206) at equal intervals along its length direction, and the bottom end of the auxiliary stirring blade (206) is connected to a transmission blade (207) facing the air outlet position of the aeration matrix (300); A circulating stirrer (204) is mounted on the inner bottom of the inner ring bracket (205), and is driven to rotate by an external drive motor; The MOBR membrane group (400) includes a symmetrically arranged connecting pipe 1 (401) and a connecting pipe 2 (403), and both ends of the connecting pipe 1 (401) and the connecting pipe 2 (403) are connected to a connecting box (402), so that the connecting pipe 1 (401), the connecting pipe 2 (403) and the connecting box (402) form a square frame structure, and a MOBR membrane tube (404) is connected between the two connecting boxes (402) at equal intervals along the length and width directions thereof; The MOBR membrane tube (404) is formed by combining an inner layer woven from MABR membrane filaments and an outer layer woven from MBR membrane filaments.

2. A wastewater advanced nitrogen removal MOBR apparatus according to claim 1, wherein, The top of one side of the reaction tank (100) is respectively connected to a biochemical effluent pipe (101) and a sewage pipe (102) which are distributed in an upper and lower manner.

3. The wastewater advanced nitrogen removal MOBR apparatus according to claim 1, wherein, The top of the sewage treatment mechanism is equipped with a collecting discharge pipe (500) which is connected to a connecting pipe 1 (401) provided inside the MOBR membrane group (400).

4. A treatment process based on the advanced wastewater denitrification MOBR apparatus of claim 1, characterized by, The processing technology is as follows: S1. Raw water and biochemical effluent are first introduced into the first group of reaction pools (100) in a certain proportion. When the water level of the pools reaches the set water level, the water inflow into the first group of reaction pools (100) is stopped, and the mixed sewage is sequentially introduced into the second group of reaction pools (100), the third group of reaction pools (100), and the fourth group of reaction pools (100); S2, after the sewage is filled, open the circulating stirrer (204) in the MOBR membrane frame (200) to realize sufficient mixing of the sludge and water, at this time, the denitrification reaction of semi-process denitrification + anaerobic ammonia oxidation occurs in the sewage, and in the process of the reaction, the pH value slowly rises; S3, when the inflection point of the pH value in the sewage is detected from rising to falling, the denitrification is completed, then the MOBR membrane group (400) is used to filter water and discharge the filtered water, and the aeration matrix (300) is used for aeration; S4, when the water level in the reaction tank (100) drops to the water level for drainage, stop the drainage and wait for the new sewage to enter the next cycle.

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