MBBR coupled MBR reactor

Abstract

The utility model discloses an MBBR (Moving Bed Biofilm Reactor)-MBR (Membrane Biological Reactor) coupled reactor, which belongs to the field of sewage treatment and comprises an outer reactor which is annular and is provided with an anaerobic zone, an aerobic zone and an anoxic zone along the circumferential direction, and the anaerobic zone is connected with a water inlet pipe and is used for introducing external sewage into the outer reactor; the inner reactor comprises a membrane pool and is surrounded by the outer reactor, an MBR membrane is arranged in the membrane pool, and a water passing hole is formed in the side wall of the membrane pool and used for being communicated with the anoxic zone; wherein an MBBR (Moving Bed Biofilm Reactor) carrier is arranged in at least partial area of the outer reactor, and a carrier screen is arranged in the water passing hole so as to prevent the MBBR carrier from entering the membrane tank. According to the MBBR coupled MBR reactor, an A2 / O process in the outer reactor is integrated in an annular tank, the occupied area is small, the space utilization rate is high, an MBBR carrier is in a fluidized state, the effect of removing ammonia nitrogen in sewage is good, in the inner reactor, an MBR membrane is matched with a membrane tank to carry out solid-liquid separation on the sewage, and sufficient purification of the sewage is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, and more specifically, to a reactor coupling MBBR and MBR. Background Art

[0002] MBR sewage treatment is a common method in modern sewage treatment. The technology of membrane bioreactor (abbreviated as MBR) combines biological treatment technology and membrane separation technology, replacing the secondary sedimentation tank in the traditional process. It can efficiently separate solid and liquid, obtaining stable reclaimed water for direct use.

[0003] For example, the Chinese patent document (Publication No.: CN 210595461 U) provides a micro MBR pilot-scale device that can operate continuously and automatically with a self-cleaning function. A micro MBR pilot-scale device that can operate continuously and automatically with a self-cleaning function is characterized by comprising a raw water tank, an anoxic tank, an MBR unit, a cleaning tank and a product water tank; wherein, the raw water tank is communicated with the anoxic tank to convey liquid into the anoxic tank; the MBR unit includes an aeration device and an aerobic tank; the anoxic tank is communicated with the aerobic tank to convey liquid into the aerobic tank; an MBR device is installed in the aerobic tank; the aeration device blows air into the aerobic tank; the MBR device has MBR water inlet and outlet ends; the MBR water inlet and outlet ends are respectively communicated with the product water tank and the cleaning tank. In the traditional MBR process, the concentration of activated sludge is relatively high, and the MBR membrane is easily fouled during the filtration process, affecting the membrane filtration flux and further affecting the stable operation of the entire system.

[0004] The MBBR process applies the basic principle of the biofilm method. By adding a certain number of suspended carriers to the reactor, the biomass and biological species in the reactor are increased, thereby improving the treatment efficiency of the reactor. Since the density of the filler is close to that of water, when aerated, it is in a completely mixed state with water, and the environment for microbial growth is a three-phase of gas, liquid and solid. The collision and shear action of the carriers in water make the air bubbles finer, increasing the utilization rate of oxygen. There are different biological species inside and outside each carrier. Some anaerobic or facultative anaerobic bacteria grow inside, and aerobic bacteria grow outside. In this way, each carrier is a micro-reactor, enabling the simultaneous existence of nitrification and denitrification reactions, thus improving the treatment effect. However, the biological film shed from the MBBR carriers causes an increase in the effluent SS, and subsequent in-depth treatment processes such as high-efficiency sedimentation tanks and magnetic coagulation sedimentation tanks need to be added, so the floor area is relatively large.

[0005] In view of the above problems, the related technologies do not provide an effective solution. Summary of the Utility Model

[0006] To solve the problems that may exist in the related art, some embodiments of the present application provide a reactor coupling MBBR and MBR, including an outer reactor, which is annular and is provided with an anaerobic zone, an aerobic zone and an anoxic zone along the circumferential direction. The anaerobic zone is connected with a water inlet pipe for introducing external sewage into the outer reactor; an inner reactor, including a membrane tank, is surrounded by the outer reactor. An MBR membrane is arranged inside the membrane tank, and water passing holes are arranged on the side wall of the membrane tank for communicating with the anoxic zone; wherein, MBBR carriers are arranged in at least part of the area of the outer reactor, and carrier screens are installed on the water passing holes to limit the entry of the MBBR carriers into the membrane tank.

[0007] Further, agitators are respectively arranged at the bottoms of the anaerobic zone, the aerobic zone and the anoxic zone, and the pushing directions of all the agitators are the same.

[0008] Further, an aeration device is further included. The aeration device includes a main pipe and a plurality of aeration branch pipes connected in parallel with the main pipe. The aeration branch pipes extend into the aerobic zone and the membrane tank.

[0009] Further, a diversion pipe and a gas washing pipe which are communicated with each other are arranged on the MBR membrane. The diversion pipe extends along the height direction of the MBR membrane, and the gas washing pipe extends along the horizontal direction at the bottom of the MBR membrane; the aeration branch pipe is communicated with the top of the diversion pipe, so that the gas of the aeration device flows down from the top of the MBR membrane to the bottom and then sprays upward from the axial surface of the gas washing pipe.

[0010] Further, a plurality of gas washing holes are arranged on the axial surface of the gas washing pipe, and the gas washing holes are arranged along the radial direction of the gas washing pipe.

[0011] Further, a plurality of the water passing holes arranged in an array are arranged on the side wall of the membrane tank.

[0012] Further, taking one aerobic zone and one anoxic zone as a treatment unit, several sequentially connected treatment units are included in the outer reactor; wherein, the aerobic zone in the head treatment unit is communicated with one side of the anaerobic zone, and the aerobic zone in the tail treatment unit is communicated with the other side of the anaerobic zone.

[0013] Further, the total volume of the anaerobic zone is smaller than the total volumes of the aerobic zone and the anoxic zone.

[0014] Further, the filling rate of the MBBR carriers in the outer reactor is 60% to 70%.

[0015] Further, the outer reactor and the inner reactor are adapted in shape. The outer reactor is circular ring-shaped, and the inner reactor is circular.

[0016] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0017] The MBBR coupled MBR reactor in this application is connected to the A 2 The / O process is integrated in an annular pool, which has high space utilization and makes the MBBR carrier in a fluidized state. It circulates in the annular pool without the need for an internal reflux pump, which reduces energy consumption. At the same time, it has a good effect on the removal of total nitrogen. After the sewage is treated in the external reactor, it enters the internal reactor through the water hole. In the internal reactor, the MBR membrane cooperates with the membrane pool to separate the sewage into solid and liquid, filter the solid impurities in the water, and achieve full purification of the sewage. Coupling the MBBR carrier with the MBR process can reduce the concentration of activated sludge, thereby reducing the fouling of the MBR membrane, and the biofilm shed by the MBBR carrier can be removed by MBR membrane filtration. The overall system has high integration, small footprint, and stable system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The drawings and descriptions of the schematic embodiments of this application are used to explain this application and do not constitute an

[0019] Inappropriate limitation of the present application. In the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the structure of a reactor of MBBR coupled with MBR according to an embodiment of the present application;

[0021] Figure 2 This is a schematic diagram of the structure of a reactor of MBBR coupled with MBR according to an embodiment of the present application;

[0022] Figure 3 This is a schematic diagram of the structure of a reactor of MBBR coupled with MBR according to an embodiment of the present application;

[0023] Figure 4 This is a schematic diagram of the coordination structure of the flow guide pipe and the gas washing pipe in the reactor of the MBBR coupled with the MBR according to an embodiment of the present application;

[0024] Description of labels:

[0025] 100, external reactor; 110, anaerobic zone; 111, water inlet pipe; 120, aerobic zone; 130, anoxic zone; 131, water hole; 140, MBBR carrier; 150, flow pusher;

[0026] 200, inner reactor; 200a, membrane tank; 210, MBR membrane; 211, outlet pipe; 212, flow guide pipe; 213, air washing pipe;

[0027] 300, main pipe; 310, aeration branch pipe. Detailed implementation manners

[0028] To enable those skilled in the art to better understand the solution of this application, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0029] In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly used to better describe this application and its embodiments, and are not used to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation. And, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0030] This embodiment provides a reactor coupling MBBR and MBR, including an outer reactor 100 and an inner reactor 200.

[0031] As Figure 1 , Figure 2 shown, the outer reactor 100 is annular, and an anaerobic zone 110, an aerobic zone 120 and an anoxic zone 130 are arranged along the circumferential direction. The anaerobic zone 110 is connected with a water inlet pipe 111 for introducing external sewage into the outer reactor 100. Specifically, as Figure 3 shown, stirrers 150 are respectively arranged at the bottoms of the anaerobic zone 110 and the anoxic zone 130, and the pushing directions of all the stirrers 150 are the same, forming an A2 / O process. The sewage passes through the anaerobic zone 110, the aerobic zone 120 and the anoxic zone 130 in sequence. Through the synergistic effect of these three zones, the organic matter, nitrogen and phosphorus in the sewage are effectively removed.

[0032] As Figure 2 shown, the inner reactor 200 includes a membrane tank 200a, which is surrounded by the outer reactor 100. An MBR membrane 210 is arranged inside the membrane tank 200a, and a water passing hole 131 is arranged on the side wall of the membrane tank 200a for communicating with the anoxic zone 130.

[0033] Optionally, a number of water passing holes 131 arranged in an array are provided on the side wall of the membrane tank 200a, and the number of the water passing holes 131 can be 4, 6, 8, etc.

[0034] Specifically, as Figure 2 shown, a water outlet pipe 211 is connected to the top of the MBR membrane 210 for discharging the clarified liquid filtered by the MBR membrane 210.

[0035] Specifically, the outer reactor 100 can be in a rectangular ring shape or other ring structures, and the shapes of the inner reactor 200 and the outer reactor 100 are dominant. Preferably, as Figure 1 shown, the outer reactor 100 is in a circular ring shape and the inner reactor 200 is circular to reduce the resistance of the sewage flowing in each reaction tank.

[0036] Among them, as Figure 2 shown, the MBBR carriers 140 are arranged in at least part of the area of the outer reactor 100, and the water passing holes 131 are equipped with carrier screens to limit the entry of the MBBR carriers 140 into the membrane tank 200a. The carrier screen is detachably connected to the water passing hole 131, which is convenient for the user to remove and clean it when the carrier screen is blocked.

[0037] Specifically, the MBBR carrier 140 is made of polyethylene, polypropylene and their modified materials, polyurethane foam, etc., and the specific gravity is close to that of water. It can be in a cylindrical shape or a spherical shape, etc., and is easy to form a biofilm.

[0038] Therefore, due to the setting of the MBBR carriers, the MBBR carriers can grow biofilms by themselves, so the concentration of suspended activated sludge can be reduced, and the possibility of fouling of the MBR membrane filtration can be further reduced.

[0039] In the MBBR-coupled MBR reactor in this embodiment, the A2 / O process in the outer reactor 100 is integrated in a circular pool, which has a small floor area and high space utilization rate. Moreover, the MBBR carriers 140 are in a fluidized state and circulate in the circular pool, eliminating the need for an internal reflux pump, reducing energy consumption. At the same time, it has a good effect on the removal of total nitrogen. After the sewage is treated by the outer reactor 100, it enters the inner reactor 200 through the water passing holes 131. In the inner reactor 200, the MBR membrane 210 and the membrane tank 200a cooperate to perform solid-liquid separation on the sewage, filtering out solid impurities in the water and achieving full purification of the sewage. This device couples the MBBR carriers with the MBR process, which can reduce the concentration of activated sludge, thereby reducing the fouling of the MBR membrane. The biofilm shed from the MBBR carriers can be filtered out by the MBR membrane. The overall system has a high integration degree, a small floor area, and stable operation.

[0040] Preferably, the filling rate of the MBBR carrier in the outer reactor 100 is 60% to 70%. In the related art, the filling rate of the MBBR carrier is generally 30% to 70%. In this application, the filling rate of the MBBR carrier is increased to 60% to 70%, which can further reduce the content of activated sludge and maintain the cleanliness of the MBR membrane as much as possible.

[0041] Specifically, as Figure 2 、 3 shown, the MBBR-coupled MBR reactor in this embodiment further includes an aeration device. The aeration device includes a main pipe 300 and a plurality of aeration branch pipes 310 connected in parallel with the main pipe 300. The aeration branch pipes 310 extend into the aerobic zone 120 and the membrane tank 200a.

[0042] More specifically, as Figure 4 shown, the MBR membrane 210 is provided with a diversion pipe 212 and a gas washing pipe 213 that communicate with each other. The diversion pipe 212 extends along the height direction of the MBR membrane 210, and the gas washing pipe 213 extends along the horizontal direction at the bottom of the MBR membrane 210. Further, a plurality of gas washing holes are provided on the axial surface of the gas washing pipe 213, and the gas washing holes are arranged along the radial direction of the gas washing pipe 213. The aeration branch pipe 310 is connected to the top of the diversion pipe 212, so that the gas from the aeration device flows down from the top of the MBR membrane 210 to the bottom and then sprays upward from the axial surface of the gas washing pipe 213.

[0043] Preferably, a gas washing pipe 213 can be arranged on the lower side of each membrane sheet of the MBR membrane 210.

[0044] In this way, the gas generated by the gas washing pipe 213 can enable the sewage to undergo aerobic reaction again, promote the full combination of the sewage and the MBR membrane 210. At the same time, the aeration gas can also wash the membrane surface and remove the sludge accumulation between the membranes, effectively removing the pollutants on the membrane surface and preventing membrane pollution and blockage.

[0045] Preferably, as Figure 1 shown, taking an aerobic zone 120 and an anoxic zone 130 as a treatment unit, the outer reactor 100 includes a plurality of sequentially connected treatment units. Specifically, the water passing hole 131 is only arranged in the anoxic zone 130 of the last treatment unit, so that the sewage can undergo multiple denitrification reactions before entering the inner reactor 200. Specifically, the total volume of the anaerobic zone 110 is smaller than the total volumes of the aerobic zone 120 and the anoxic zone 130.

[0046] Among them, the aerobic zone 120 in the first treatment unit is connected to one side of the anaerobic zone 110, and the aerobic zone 120 in the last treatment unit is connected to the other side of the anaerobic zone 110. Before the sewage enters the aerobic zone 120 and the anoxic zone 130, the biogas is released as fully as possible in the anaerobic zone 110 to provide conditions for subsequent denitrification reactions.

[0047] Thus, the outer reactor 100 of the MBBR-coupled MBR reactor in this embodiment forms a circulating flow with anaerobic, anoxic, and aerobic alternation, eliminating the need for mixed liquor reflux. During this process, the biofilm grown on the MBBR carrier 140 can greatly enhance the sewage treatment capacity of the activated sludge system. The MBR membrane 210 is arranged in the outer reactor 100 to filter the effluent, eliminating the need for a secondary sedimentation tank, making the entire reactor structure more compact, with a small floor area and high space utilization rate.

[0048] In this application, the terms "installed", "set", "provided with", "connected", "linked", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can also be internal communication between two devices, components, or constituent parts. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] The above are only the preferred embodiments of this application and are not used to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A reactor integrating MBBR and MBR, characterized in that, Comprising: An outer reactor, which is annular and is provided with an anaerobic zone, an aerobic zone and an anoxic zone in the circumferential direction. The anaerobic zone is connected with a water inlet pipe for introducing external sewage into the outer reactor. An inner reactor, which includes a membrane tank and is surrounded by the outer reactor. An MBR membrane is arranged inside the membrane tank, and water passing holes are arranged on the side wall of the membrane tank for communicating with the anoxic zone. Wherein, MBBR carriers are arranged in at least part of the area of the outer reactor, and a carrier screen is installed on the water passing holes to limit the entry of the MBBR carriers into the membrane tank.

2. A reactor coupling MBBR and MBR according to claim 1, wherein: Agitators are respectively arranged at the bottoms of the anaerobic zone and the anoxic zone, and the flow directions of all the agitators are the same.

3. A reactor coupling MBBR and MBR according to claim 1, wherein: An aeration device is further included. The aeration device includes a main pipe and a plurality of aeration branch pipes connected in parallel with the main pipe. The aeration branch pipes extend into the aerobic zone and the membrane tank.

4. A reactor coupling MBBR and MBR according to claim 3, wherein: The MBR membrane is provided with a diversion pipe and a gas washing pipe which are communicated with each other. The diversion pipe extends along the height direction of the MBR membrane, and the gas washing pipe extends along the horizontal direction at the bottom of the MBR membrane. The aeration branch pipe is communicated with the top of the diversion pipe, so that the gas of the aeration device flows from the top of the MBR membrane to the bottom and then sprays upward from the axial surface of the gas washing pipe.

5. A reactor coupling MBBR and MBR according to claim 4, wherein: A plurality of gas washing holes are arranged on the axial surface of the gas washing pipe, and the gas washing holes are arranged along the radial direction of the gas washing pipe.

6. A reactor coupling MBBR and MBR according to claim 1, wherein: A plurality of water passing holes arranged in an array are arranged on the side wall of the membrane tank.

7. A reactor coupling MBBR and MBR according to claim 1, wherein: Taking one aerobic zone and one anoxic zone as a treatment unit, a plurality of the treatment units connected in sequence are included in the outer reactor. Wherein, the aerobic zone in the head treatment unit is communicated with one side of the anaerobic zone, and the aerobic zone in the tail treatment unit is communicated with the other side of the anaerobic zone.

8. A reactor coupling MBBR and MBR according to claim 7, wherein: The water passing holes are only arranged in the anoxic zone of the tail treatment unit.

9. A reactor coupling MBBR and MBR according to any one of claims 1-8, wherein: The filling rate of the MBBR carriers in the outer reactor is 60% to 70%.

10. A reactor coupling MBBR and MBR according to any one of claims 1-8, wherein: The outer reactor and the inner reactor are adapted in shape. The outer reactor is circular ring-shaped, and the inner reactor is circular.

Images