A sewage treatment device and method based on continuous flow aerobic granular sludge

Abstract

The present invention discloses a sewage treatment device and method based on continuous flow aerobic granular sludge. The sewage treatment device comprises: an anaerobic tank and an aerobic tank. A water inlet pipe is arranged at the bottom of the side wall of the aerobic tank. The first muddy-water mixture of the anaerobic tank enters the aerobic tank through the water inlet pipe; an aeration device and at least one impactor are arranged in the aerobic tank. The aeration device is arranged at the bottom of the aerobic tank and is located below the water inlet pipe. The impactors are all located above the water inlet pipe; the aerobic tank is also provided with a reflux port. The second muddy-water mixture flows back to the anaerobic tank through the reflux port, wherein the second muddy-water mixture is formed by enriching the aerobic granular sludge in the aerobic tank with the first muddy-water mixture. The impactor is integrated in the aerobic tank. Combined with the gravity / water flow driving force and shear force caused by aeration, the microorganisms and the sludge contact and collide with each other in the impactor to form stable and mature aerobic granular sludge. Through the cyclic reaction of the anaerobic tank and the aerobic tank, the sewage treatment effect is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a sewage treatment device and method based on continuous flow aerobic granular sludge. Background Art

[0002] The activated sludge process is a mature sewage treatment technology and the most widely used process for biological treatment of sewage and wastewater. It has high efficiency in removing organic matter, strong adaptability, simple operation and management, and can achieve energy recovery. However, the activated sludge process also has problems such as large footprint and easy sludge expansion.

[0003] Aerobic granular sludge (AGS) is a compact and regular microbial aggregate formed by the mutual aggregation of microorganisms under specific conditions. Under physical, chemical or biological forces, the aggregates cause the microorganisms to adsorb to each other, and the microorganisms secrete extracellular polymers (EPS) to produce biogels to form microbial aggregates. Compared with the traditional activated sludge method, aerobic granular sludge technology has more advantages, such as small footprint, good sedimentation performance, high biomass concentration, high organic load resistance and low sludge swelling. It is currently the most promising biological treatment technology for sewage and wastewater.

[0004] Some of the current granular sludge culture reactors use intermittent water inlet and outlet and cannot operate continuously. They have long aeration times, high energy consumption, and sludge disintegration during long operation times. They also treat a small amount of water and are not suitable for large-scale sewage treatment project applications.

[0005] There is also a part of continuous flow process, such as patent CN221479688U which discloses an AGS-SBR integrated sewage treatment device, including an adjusting tank, an agitator is provided in the adjusting tank, and sewage is sent into the adjusting tank through a sewage pump; a water supply pipe, one end of which is connected to the adjusting tank, and the other end is connected to the water inlet at the bottom of the AGS reactor through a water inlet pump; a microporous aeration disk is provided inside the AGS reactor, and the air inlet pipe of the microporous aeration disk is connected to an external blower; a sludge discharge port is provided on the side wall of the AGS reactor above the microporous aeration disk, and the sludge discharge port is connected to the sludge storage tank through a sludge discharge pipe; an outlet pipe connected to a water collection tank is provided on the upper part of the AGS reactor, and an outlet valve is provided on the outlet pipe; a sludge concentration sensor is provided at the bottom of the AGS reactor; a sand filter tank is connected to the water collection tank through a pipeline equipped with a pressure pump, and the pressure pump transports the water in the water collection tank to the sand filter tank for filtration. The device can not only ensure the rapid formation of aerobic granular sludge, but also continuously take in water when the sewage volume in the highway service area fluctuates greatly, ensuring the efficient treatment of high-concentration organic sewage.

[0006] However, the above continuous flow process devices operate multiple reactors in series or separate the aeration zone from the sedimentation zone, resulting in poor sewage treatment effect, a large overall structure footprint, and high costs.

[0007] Some other granular sludge culture reactors use biofilms to culture aerobic granular sludge. For example, patent CN118239600A provides a hydraulically driven continuous flow aerobic granular sludge-membrane filtration integrated device and application, including an inlet system, an outlet system, a reactor shell, a membrane assembly and an aeration assembly; a first baffle is provided in the reactor shell, and the first baffle separates the inside of the reactor shell into an anoxic zone and an aerobic zone; a multi-stage diversion mechanism for changing the flow direction of the mud-water mixture is provided in the vertical direction in the anoxic zone; the aeration assembly is provided at the bottom of the aerobic zone, and is used to make the mud-water mixture form a circular motion between the anoxic zone and the aerobic zone; the membrane assembly is provided in the aerobic zone and is placed above the nano aeration disk. This solution can achieve good hydraulic conditions under continuous flow conditions, create a granulation driving force, and realize the rapid formation and stable operation of aerobic granular sludge; the combination of aerobic granular sludge and membrane assembly filtration can improve the effluent quality, reduce membrane pollution, shorten the process flow, and reduce the floor space.

[0008] However, the above-mentioned prior art uses biofilm to cultivate aerobic granular sludge, which requires the installation of a biofilm mechanism inside or outside the reactor device. At the same time, after using the biofilm, it is also necessary to consider the selection of biofilm material, biofilm efficiency, clogging and other issues, which increases equipment and material costs.

[0009] Therefore, it is an urgent problem to be solved by technical personnel in this field to explore sewage treatment equipment with continuous flow aerobic granular sludge that saves manufacturing costs, saves space, and has good treatment effects and high efficiency, so as to realize the large-scale promotion and application of sewage treatment based on continuous flow aerobic granular sludge. Summary of the invention

[0010] In view of the defects existing in the above-mentioned prior art, the present invention provides a sewage treatment device and method based on continuous flow aerobic granular sludge, the sewage treatment device comprising: an anaerobic tank and an aerobic tank, a water inlet pipe is arranged at the bottom of the side wall of the aerobic tank, and a first mud-water mixture in the anaerobic tank enters the aerobic tank through the water inlet pipe; an aeration device and at least one impactor are arranged in the aerobic tank, the aeration device is arranged at the bottom of the aerobic tank and is located below the water inlet pipe, and the impactors are all located above the water inlet pipe; the aerobic tank is also provided with a reflux port, and a second mud-water mixture flows back to the anaerobic tank through the reflux port, wherein the second mud-water mixture is formed by enriching the aerobic granular sludge in the aerobic tank with the first mud-water mixture.

[0011] The impactor is integrated into the anaerobic tank. Combined with the gravity / water flow driving force and hydraulic shear force caused by aeration, the microorganisms and sludge contact and collide with each other in the impactor to form stable and mature aerobic granular sludge. The sewage treatment effect is improved through the cyclic reaction of the anaerobic tank and the aerobic tank.

[0012] In addition, the sewage treatment device based on continuous flow aerobic granular sludge provided by the present invention is more integrated and miniaturized, which saves manufacturing costs and space, has good treatment effects, and the circulation reaction between the anaerobic tank and the aerobic tank also improves the efficiency of sewage treatment.

[0013] In a first aspect, the present invention provides a sewage treatment device based on continuous flow aerobic granular sludge, specifically comprising: an anaerobic tank and an aerobic tank, wherein a water inlet pipe is arranged at the bottom of the side wall of the aerobic tank, and a first mud-water mixture in the anaerobic tank enters the aerobic tank through the water inlet pipe;

[0014] An aeration device and at least one impactor are arranged in the aerobic pool, wherein the aeration device is arranged at the bottom of the aerobic pool and below the water inlet pipe, and the impactors are arranged above the water inlet pipe;

[0015] The aerobic tank is also provided with a reflux port, and the second mud-water mixture flows back to the anaerobic tank through the reflux port, wherein the second mud-water mixture is formed by enriching the aerobic granular sludge in the aerobic tank with the first mud-water mixture.

[0016] Furthermore, the water inlet pipe penetrates the side wall of the aerobic pool and extends into the aerobic pool. The water inlet pipe is provided with a plurality of water outlet holes which are evenly distributed.

[0017] Furthermore, it also includes a first reflux pipe, which is connected with the reflux port and the anaerobic tank.

[0018] Furthermore, the plurality of impactors are evenly arranged along the same height direction in the aerobic tank, and / or the plurality of impactors are divided into at least two rows along the height direction, and the impactors in each row are evenly arranged along the same height direction.

[0019] Further, the collision device includes an upper region and a lower region, the upper region includes a first plane and a second plane, one side of the first plane coincides with one side of the second plane, and the first plane and the second plane are arranged at an angle;

[0020] The lower area is an arc surface, and two edges of the arc surface coincide with the other side of the first plane and the other side of the second plane respectively, and the central angle of the arc surface is 60°-90°.

[0021] Furthermore, it also includes a second return pipe and a circulation pump arranged on the second return pipe;

[0022] The circulation pump is arranged outside the aerobic tank, the starting end of the second reflux pipe is connected to the bottom of at least one impactor, the second reflux pipe penetrates the side wall of the aerobic tank from the starting end, penetrates the side wall of the aerobic tank twice through the circulation pump, and extends into the aerobic tank, and the terminal end of the second reflux pipe is located in the aerobic tank;

[0023] The second return pipe is located above the water inlet pipe and below the impactor.

[0024] Furthermore, the impactor is a hollow structure, comprising a first part and a second part connected from top to bottom along the height direction;

[0025] The first part is cylindrical, the upper end of the first part is open, and the lower end of the first part is connected to the second part;

[0026] The second part is conical, the upper end of the second part is a circular surface and is connected to the lower end of the first part, the lower end of the second part is set as an open structure, and the upper end radius of the second part is greater than the lower end radius of the second part.

[0027] Furthermore, the side wall sealing arrangement of the impactor is such that the ratio of the height of the first portion to the radius of the cylinder is (4-6):1, and the ratio of the height of the first portion to the height of the second portion is (2-3):1.

[0028] Furthermore, it also includes a screener and a third reflux pipe, the screener is a conical structure, the upper end of the screener is a circular surface, and the lower end of the screener is an opening;

[0029] The upper end of the sifter is connected to the top of the side wall of the aerobic tank, the starting end of the third return pipe is connected to the lower end of the sifter, and after the third return pipe passes through the anaerobic tank, the terminal end of the third return pipe is located in the anaerobic tank.

[0030] In a second aspect, the present invention further provides a sewage treatment method based on continuous flow aerobic granular sludge, using the above-mentioned sewage treatment device based on continuous flow aerobic granular sludge, specifically comprising the following steps:

[0031] The sewage enters the anaerobic tank and mixes with the aerobic granular sludge in the second mud-water mixture to form the first mud-water mixture;

[0032] The first mud-water mixture enters the aerobic tank through the water inlet pipe at the bottom of the aerobic tank side wall;

[0033] The aeration device at the bottom of the aerobic tank generates aeration, so that the first mud-water mixture flows upward to generate an upflow, and the upflow hits the impactor to generate a downflow, and the first mud-water mixture circulates from the upflow to the downflow to form a second mud-water mixture;

[0034] The second mud-water mixture flows back to the anaerobic tank through the return port of the aerobic tank;

[0035] The sewage is treated in the anaerobic tank and the aerobic tank and then discharged from the aerobic tank.

[0036] The present invention provides a sewage treatment device and method based on continuous flow aerobic granular sludge, which at least have the following beneficial effects:

[0037] (1) The sewage treatment device based on continuous flow aerobic granular sludge provided by the present invention is more integrated and miniaturized, which saves manufacturing cost and space, has good treatment effect, and the circulation reaction between the anaerobic tank and the aerobic tank also improves the efficiency of sewage treatment.

[0038] (2) The impactor is integrated into the anaerobic tank. Combined with the gravity / water flow driving force and hydraulic shear force caused by aeration, the microorganisms and sludge contact and collide with each other in the impactor to form stable and mature aerobic granular sludge. Through the cyclic reaction of the anaerobic tank and the aerobic tank, the sewage treatment effect is improved.

[0039] (3) The hollow structure, sealed side walls, cylindrical top and conical bottom of the impactor can increase the contact and collision between the mud-water mixture and the side wall of the impactor. Under the action of the second reflux pipe and the circulation pump, it can drive the microorganisms and sludge to gather and aggregate, forming stable and mature aerobic sludge particles.

[0040] (4) The second mud-water mixture enters the sifter through the top opening of the aerobic tank side wall. Under the action of centrifugal force and fluid drag, most of the coarse aerobic granular sludge returns to the anaerobic tank through the third return pipe to continue participating in the cycle reaction. In addition, the sifter can also filter out the lighter suspended sludge floating on the surface of the mud-water mixture, thereby improving the quality of the aerobic granular sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A structural diagram of a sewage treatment device based on continuous flow aerobic granular sludge provided by the present invention;

[0042] Figure 2 A schematic diagram of the structure of a sewage treatment device based on continuous flow aerobic granular sludge according to an embodiment of the present invention;

[0043] Figure 3 A schematic diagram of the structure of the collision device arrangement of a certain embodiment provided by the present invention;

[0044] Figure 4 A schematic diagram of the structure of a collision device according to an embodiment of the present invention;

[0045] Figure 5 A schematic structural diagram of a sewage treatment device based on continuous flow aerobic granular sludge according to a second embodiment of the present invention;

[0046] Figure 6 A schematic structural diagram of a sewage treatment device based on continuous flow aerobic granular sludge according to a third embodiment of the present invention;

[0047] Figure 7 A schematic structural diagram of a sewage treatment device based on continuous flow aerobic granular sludge according to a fourth embodiment of the present invention;

[0048] Figure 8 A schematic flow chart of a sewage treatment method based on continuous flow aerobic granular sludge provided by the present invention.

[0049] Description of reference numerals:

[0050] 1-anaerobic tank, 2-aerobic tank, 21-water inlet pipe, 211-water outlet, 22-aeration device, 23-impinger, 231-upper area, 232-lower area, 2311-first plane, 2312-second plane, 233-first part, 234-second part, 24-first return pipe, 25-second return pipe, 251-circulation pump, 26-screener, 27-third return pipe. DETAILED DESCRIPTION

[0051] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0053] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0054] Aerobic granular sludge (AGS) has great application potential and has become one of the hot spots in the application research of microbial wastewater treatment due to its many advantages, such as good settling performance, maintaining high biomass, easy solid-liquid separation, ability to withstand high organic loads, simultaneous nitrogen and phosphorus removal, and reduced sewage treatment costs. Although aerobic granules have become one of the new technology hotspots for sewage biochemical treatment due to their outstanding advantages, due to the harsh formation and operation conditions and relatively complex processes, there have been some reports on the application of industrial wastewater treatment under small-scale conditions for a long time, but it has not yet been widely promoted on a large scale.

[0055] At present, when sewage treatment is carried out based on continuous flow and using the activated sludge method, the continuous flow process device runs multiple reactors in series or separates the aeration area from the sedimentation area, resulting in poor sewage treatment effect, large overall structure footprint, and high cost. In addition, the cultivation of aerobic granular sludge through biofilm requires the addition of biofilm mechanisms inside or outside the reactor device, and the selection of biofilm materials, biofilm efficiency, clogging and other issues need to be considered, which increases equipment and material costs.

[0056] Explore continuous flow aerobic granular sludge sewage treatment equipment that saves manufacturing costs, saves space, has good treatment effects and high efficiency, so as to realize large-scale promotion and application of sewage treatment based on continuous flow aerobic granular sludge.

[0057] like Figure 1-Figure 2 As shown, the present invention provides a sewage treatment device based on continuous flow aerobic granular sludge, which specifically comprises: an anaerobic tank 1 and an aerobic tank 2, wherein a water inlet pipe 21 is arranged at the bottom of the side wall of the aerobic tank, and the first mud-water mixture of the anaerobic tank 1 enters the aerobic tank 2 through the water inlet pipe 21;

[0058] An aeration device 22 and at least one impactor 23 are provided in the aerobic pool 2. The aeration device 22 is provided at the bottom of the aerobic pool 2 and is located below the water inlet pipe 21. The impactors 23 are all located above the water inlet pipe 22.

[0059] The aerobic tank 2 is also provided with a reflux port, and the second mud-water mixture flows back to the anaerobic tank 1 through the reflux port, wherein the second mud-water mixture is formed by enriching the aerobic granular sludge in the aerobic tank 1 with the first mud-water mixture.

[0060] When sewage enters the anaerobic tank, the substrate in the sewage is preferentially mixed with the aerobic granular sludge (AGS) in the returned second mud-water mixture, where phosphorus is released by polyphosphate bacteria and energy is converted into lipid carbon source storage (poly-β-hydroxybutyrate PHB), which is then stored in the body. At the same time, denitrification reaction also occurs to form the first mud-water mixture.

[0061] The first mud-water mixture enters the aerobic tank through the water inlet pipe at the bottom of the aerobic tank side wall, and aerobic phosphorus absorption and nitrification reactions occur in the aerobic tank, which consumes the pollutants attached to the AGS and returns the AGS to a hungry state. The alternation of satiation and starvation achieved by AGS in the anaerobic tank and aerobic tank will cause the attached microorganisms to produce a large amount of extracellular polymers (EPS), which is conducive to the adsorption and aggregation of AGS and accelerates the aggregation of AGS.

[0062] The aeration device at the bottom of the aerobic tank provides hydraulic shear force to the first mud-water mixture, which can promote the collision and coagulation of flocculent sludge, accelerate the secretion of EPS by AGS, accelerate the formation of granulation, and blow off the excess filamentous bacteria on the surface of AGS, so that the water flow flows upward. When the water flow hits the collider, it forms a downflow; after falling, it moves upward again under the action of aeration shear force, and after hitting the collider, it forms a downflow; the first mud-water mixture flows back to the upflow area after settling in the downflow area during the circulation process from the upflow area to the downflow area, forming a circulating flow. AGS contact and collide with each other under the action of gravity / water flow driving force, hydraulic shear force, etc. At the same time, due to the biological gelation of EPS, polymers are formed, and after continuous collision and movement, a more stable and mature AGS with a three-dimensional structure is formed.

[0063] The impactor is integrated into the aerobic tank. Combined with the gravity / water flow driving force and shear force caused by aeration, microorganisms and sludge contact and collide with each other in the impactor to form stable and mature aerobic granular sludge. Through the cyclic reaction of anaerobic tank and aerobic tank, the sewage treatment effect is improved.

[0064] like Figure 1-Figure 2 As shown, the water inlet pipe 21 passes through the side wall of the aerobic pool and extends into the aerobic pool 2. The water inlet pipe 21 is provided with a plurality of water outlet holes 211, and the water outlet holes 211 are evenly distributed.

[0065] The sewage treatment device comprises a first return pipe 24 , and the first return pipe 24 is connected with the return port and the anaerobic tank 1 .

[0066] The water inlet pipe can also be called a water distributor. There are multiple water outlet holes on the water inlet pipe to achieve uniform water distribution. Since the water inlet pipe runs through the side wall of the aerobic tank and extends to the inside of the aerobic tank, the first mud-water mixture passing through the water inlet pipe can contact the impactor set in the aerobic tank under the action of the upward thrust force generated by the aeration of the bottom aeration device, thereby forming stable and mature aerobic granular sludge.

[0067] The second mud-water mixture formed in the aerobic tank enters the first return pipe through the return port, and flows back to the anaerobic tank along the first return pipe to continue the cyclic reaction of sewage treatment.

[0068] The number and arrangement of the impactors in the aerobic tank can be set according to multiple factors such as the sewage treatment volume, sewage treatment standards and characteristics of aerobic granular sludge in different application scenarios.

[0069] In a certain embodiment, a plurality of impactors 23 are provided in the aerobic pool 2, and the plurality of impactors 23 are evenly arranged along the same height direction in the aerobic pool 1, that is, the impactors 23 are arranged in a straight line. The first mud-water mixture hits a certain impactor arranged in a straight line during the rising process, forming a downflow; after falling, it moves upward again under the action of the aeration shear force, and hits the impactor to form a downflow; the first mud-water mixture circulates from the upflow area to the downflow area, and after settling in the downflow area, it flows back to the upflow area, forming a circulating flow. The impactors arranged in a straight line are flexible to set, and can be arranged according to the upflow and downflow areas of the first mud-water mixture, thereby improving the use efficiency and facilitating the subsequent cleaning and maintenance.

[0070] In addition, the plurality of impactors 23 may also be divided into at least two rows along the height direction, and the impactors 23 in each row are evenly arranged along the same height direction. Figure 3 As shown, multiple colliders are divided into two rows along the height direction. The number of colliders in each row can be arranged according to different application scenarios, and the colliders in each row are evenly arranged.

[0071] By dividing multiple colliders into multiple rows along the height direction and arranging the number of each row in a layered manner according to different application scenarios, each upflow of the first mud-water mixture can be fully utilized, the collision efficiency of the collider and the water flow can be improved, and the AGS in the first mud-water mixture can be more easily formed into aggregates, and stable and mature AGS can be formed more quickly.

[0072] In the aerobic tank, the collision device mainly realizes the mutual contact and collision of sludge and microorganisms in the first mud-water mixture, drives the microorganisms and sludge to cluster and aggregate, and forms a stable and mature AGS.

[0073] In one embodiment, if Figure 4 As shown, the collision device 23 may include an upper region 231 and a lower region 232, the upper region 231 includes a first plane 2311 and a second plane 2312, one side of the first plane 2311 coincides with one side of the second plane 2312, and the first plane 2311 and the second plane 2312 are arranged at an angle;

[0074] The lower area 232 is an arc surface, and two edges of the arc surface coincide with the other side of the first plane 2311 and the other side of the second plane 2312 respectively, and the central angle of the arc surface is 60°-90°.

[0075] The impactor can be fixed by connecting the two end faces to the side walls of the aerobic tank respectively. Divided in the height direction of the aerobic tank, the impactor is divided into an upper area and a lower area. The upper area is in the shape of a folded surface as a whole. The first plane and the second plane intersect, and the cross-sectional view of the upper area is an open triangular structure; the lower area is connected to the upper area, and the connection is in a way that the two edges of the arc surface of the lower area coincide with the other side of the first plane and the other side of the second plane respectively. The arc surface design of the lower area facilitates the collision with the sludge in the first mud-water mixture, thereby changing the running direction. In order to better ensure the downward movement of the sludge in the first sewage mixture after contacting the impactor, the arc surface cannot be too flat or too curved, and the central angle of the arc surface is set between 60°-90°.

[0076] In addition to designing the structural shape of the impactor, the contact and collision of the first mud-water mixture with the impactor can be accelerated by adding suction reflux equipment, thereby improving the quality and efficiency of aerobic granular sludge formation.

[0077] like Figure 5-Figure 6 As shown, the sewage treatment device also includes a second return pipe 25 and a circulation pump 251 disposed on the second return pipe 25;

[0078] The circulation pump 251 is arranged on the outside of the aerobic pool 2, and the starting end of the second return pipe 25 is connected to the bottom of at least one impactor 23. The second return pipe 25 penetrates the side wall of the aerobic pool from the starting end and then penetrates the side wall of the aerobic pool twice through the circulation pump 251, and extends into the aerobic pool 2. The terminal end of the second return pipe 25 is located in the aerobic pool 2; the second return pipe 25 is located above the water inlet pipe 21 and below the impactor 23.

[0079] The second return pipe connects the bottom of the impactor and the inside of the aerobic tank. After the first mud-water mixture enters and contacts the impactor, it is driven by the shear force of the water flow at the bottom of the impactor to form a vortex flow state under the suction action of the circulating pump on the second return pipe. The sludge density and centrifugal force in the mud-water mixture in the vortex flow state are greater. Microorganisms and sludge contact and collide with each other in the impactor to form stable and mature aerobic granular sludge. Through the cyclic reaction of the anaerobic tank and the aerobic tank, the sewage treatment effect is improved. In addition, when the shear force of the water flow at the bottom of the impactor drives the formation of a vortex flow state, the mud-water mixture in the middle and upper part of the impactor is also accelerated to descend under the driving force of the generated water flow.

[0080] Therefore, the provision of the second reflux pipe and the circulation pump can accelerate the contact and collision between the first mud-water mixture and the impactor, thereby improving the quality and efficiency of aerobic granular sludge formation.

[0081] In addition, in one embodiment, if Figure 5-Figure 6As shown, the impactor 23 is a hollow structure, including a first part 233 and a second part 234 connected from top to bottom along the height direction;

[0082] The first part 233 is cylindrical, the upper end of the first part 233 is open, and the lower end of the first part 233 is connected to the second part 234;

[0083] The second part 234 is conical, the upper end of the second part 234 is a circular surface and is connected to the lower end of the first part 233 , the lower end of the second part 234 is set as an open structure, and the upper end radius of the second part 234 is greater than the lower end radius of the second part 234 .

[0084] The side wall sealing arrangement of the impactor 23 is such that the ratio of the height of the first portion 233 to the cylinder radius is (4-6):1, and the ratio of the height of the first portion 233 to the height of the second portion 234 is (2-3):1.

[0085] The lower end of the second part of at least one impactor 23 is connected to the starting end of the second return pipe 25. Figure 6 In the embodiment, the lower ends of the second parts of all the impactors are communicated with the starting end of the second return pipe 25 .

[0086] The hollow structure, sealed side walls, cylindrical top and conical bottom of the impactor can increase the contact and collision between the mud-water mixture and the side walls of the impactor. Under the action of the second reflux pipe and the circulation pump, it can drive the microorganisms and sludge to gather and aggregate, forming stable and mature aerobic sludge particles.

[0087] like Figure 6-Figure 7 As shown, the sewage treatment device further includes a screener 26 and a third return pipe 27. The screener 26 is a conical structure. The upper end of the screener 26 is a circular surface, and the lower end of the screener is an opening. The upper end radius of the screener 26 is greater than the lower end radius of the screener 26.

[0088] The upper end of the sifter 26 is connected to the top of the side wall of the aerobic tank, the starting end of the third return pipe 27 is connected to the lower end of the sifter 26, and after the third return pipe 27 passes through the anaerobic tank 1, the terminal end of the third return pipe 27 is located in the anaerobic tank 1.

[0089] In order to obtain aerobic granular sludge with a higher concentration, the sewage treatment device is also designed with a screener. The second mud-water mixture can also enter the screener through the top opening of the aerobic tank side wall. Under the action of centrifugal force and fluid drag, most of the coarse aerobic granular sludge returns to the anaerobic tank through the third return pipe to continue to participate in the circulation reaction. In addition, the screener can also filter out the lighter suspended sludge floating on the surface of the mud-water mixture, thereby improving the quality of the aerobic granular sludge.

[0090] The mechanism of the sewage treatment device based on continuous flow aerobic granular sludge is as follows:

[0091] When sewage enters the anaerobic tank, the substrate in the sewage is preferentially mixed with the aerobic granular sludge (AGS) in the second mud-water mixture returned from the aerobic tank. Polyphosphate-accumulating bacteria release phosphorus and convert energy into lipid carbon source storage (poly-β-hydroxybutyrate PHB), which is then stored in the body. At the same time, denitrification reaction also occurs to form the first mud-water mixture.

[0092] The first mud-water mixture enters the aerobic tank through the water inlet pipe at the bottom of the aerobic tank side wall, and aerobic phosphorus absorption and nitrification reactions occur in the aerobic tank, which consumes the pollutants attached to the AGS and returns the AGS to a hungry state. The alternation of satiation and starvation achieved by AGS in the anaerobic tank and aerobic tank will cause the attached microorganisms to produce a large amount of extracellular polymers (EPS), which is conducive to the adsorption and aggregation of AGS and accelerates the aggregation of AGS.

[0093] In the aerobic tank, the aeration device at the bottom of the aerobic tank provides hydraulic shear force to the first mud-water mixture. The hydraulic shear force promotes the collision and coagulation of flocculent sludge, accelerates the secretion of EPS by AGS, accelerates the formation of granulation, and blows off the excess filamentous bacteria on the surface of AGS, so that the first mud-water mixture flows upward. When the water flow hits the collider, it forms a downflow; after falling, it moves upward again under the action of aeration shear force, and after hitting the collider, it forms a downflow; the first mud-water mixture flows back to the upflow area after settling in the downflow area during the circulation process from the upflow area to the downflow area, forming a circulating flow. AGS contact and collide with each other under the action of gravity / water flow driving force, hydraulic shear force, etc. At the same time, due to the biological gelation of EPS, polymers are formed, and after continuous collision and movement, a more stable and mature AGS with a three-dimensional structure is formed.

[0094] The sewage treatment device is designed with a screener. The second mud-water mixture can also enter the screener through the top opening of the aerobic tank side wall. Under the action of centrifugal force and fluid drag, most of the coarse aerobic granular sludge returns to the anaerobic tank through the third return pipe to continue participating in the circulation reaction. The lighter suspended sludge floating on the surface of the mud-water mixture is screened out to improve the quality of the aerobic granular sludge.

[0095] A sewage treatment device is designed with a second return pipe and a circulation pump. After the first mud-water mixture enters and contacts the impactor, it is driven by the shear force of the water flow at the bottom of the impactor under the suction action of the circulation pump on the second return pipe to form a vortex flow state. The mud-water mixture in the middle and upper part of the impactor is also accelerated to descend under the driving force of the generated water flow. The sludge density and centrifugal force in the mud-water mixture in the vortex flow state are greater, and the microorganisms and sludge contact and collide with each other in the impactor to form stable and mature aerobic granular sludge.

[0096] like Figure 8As shown, the present invention also provides a sewage treatment method based on continuous flow aerobic granular sludge, using the above-mentioned sewage treatment device based on continuous flow aerobic granular sludge, specifically comprising the following steps:

[0097] The sewage enters the anaerobic tank and mixes with the aerobic granular sludge in the second mud-water mixture to form the first mud-water mixture;

[0098] The first mud-water mixture enters the aerobic tank through the water inlet pipe at the bottom of the aerobic tank side wall;

[0099] The aeration device at the bottom of the aerobic tank generates aeration, so that the first mud-water mixture flows upward to generate an upflow, and the upflow hits the impactor to generate a downflow, and the first mud-water mixture circulates from the upflow to the downflow to form a second mud-water mixture;

[0100] The second mud-water mixture flows back to the anaerobic tank through the return port of the aerobic tank;

[0101] The sewage is treated in the anaerobic tank and the aerobic tank and then discharged from the aerobic tank.

[0102] The present invention provides a sewage treatment device and method based on continuous flow aerobic granular sludge, which at least have the following beneficial effects:

[0103] (1) The sewage treatment device based on continuous flow aerobic granular sludge provided by the present invention is more integrated and miniaturized, which saves manufacturing cost and space, has good treatment effect, and the circulation reaction between the anaerobic tank and the aerobic tank also improves the efficiency of sewage treatment.

[0104] (2) The impactor is integrated into the anaerobic tank. Combined with the gravity / water flow driving force and hydraulic shear force caused by aeration, the microorganisms and sludge contact and collide with each other in the impactor to form stable and mature aerobic granular sludge. Through the cyclic reaction of the anaerobic tank and the aerobic tank, the sewage treatment effect is improved.

[0105] (3) The hollow structure, sealed side walls, cylindrical top and conical bottom of the impactor can increase the contact and collision between the mud-water mixture and the side wall of the impactor. Under the action of the second reflux pipe and the circulation pump, it can drive the microorganisms and sludge to gather and aggregate, forming stable and mature aerobic sludge particles.

[0106] (4) The second mud-water mixture enters the sifter through the top opening of the aerobic tank side wall. Under the action of centrifugal force and fluid drag, most of the coarse aerobic granular sludge returns to the anaerobic tank through the third return pipe to continue participating in the cycle reaction. In addition, the sifter can also filter out the lighter suspended sludge floating on the surface of the mud-water mixture, thereby improving the quality of the aerobic granular sludge.

[0107] Although preferred embodiments of the present invention have been described, additional changes and modifications may be made to these embodiments by those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A sewage treatment method based on continuous flow aerobic granular sludge, characterized in that: A sewage treatment device based on continuous flow aerobic granular sludge is used, which specifically includes: an anaerobic tank and an aerobic tank, wherein a water inlet pipe is arranged at the bottom of the side wall of the aerobic tank, and the first mud-water mixture of the anaerobic tank enters the aerobic tank through the water inlet pipe; An aeration device is arranged in the aerobic pool, and the aeration device is arranged at the bottom of the aerobic pool and below the water inlet pipe; The aerobic tank is also provided with a reflux port, through which the second muddy-water mixture flows back to the anaerobic tank, wherein the second muddy-water mixture is formed by enriching the aerobic granular sludge in the aerobic tank with the first muddy-water mixture; A plurality of impactors are arranged in the aerobic pool, and the plurality of impactors are divided into at least two rows along the height direction, and the impactors in each row are evenly arranged along the same height direction, and the impactors are all located above the water inlet pipe; The impactor is connected to the side wall of the aerobic pool through two end faces, respectively. The impactor includes an upper area and a lower area. The upper area is in a folded shape as a whole. The cross-sectional view of the upper area is an open triangular structure. The upper area includes a first plane and a second plane. The first plane and the second plane intersect. One side of the first plane coincides with one side of the second plane. The first plane and the second plane are arranged at an angle. The lower area is a curved surface, the central angle of the curved surface is 60°-90°, the lower area is connected to the upper area, and two edges of the curved surface coincide with the other side of the first plane and the other side of the second plane respectively; It also includes a screener and a third reflux pipe, wherein the screener is a conical structure, the upper end of the screener is a circular surface, and the lower end of the screener is an opening; The upper end of the sifter is connected to the top of the side wall of the aerobic tank, the starting end of the third return pipe is connected to the lower end of the sifter, and after the third return pipe passes through the anaerobic tank, the terminal end of the third return pipe is located in the anaerobic tank; The sewage treatment method specifically comprises the following steps: The sewage enters the anaerobic tank and mixes with the aerobic granular sludge in the second mud-water mixture. The phosphorus is released by the polyphosphate bacteria and the energy is converted into lipid carbon source storage, which is then stored in the body. At the same time, denitrification reaction also occurs to form the first mud-water mixture. The first sludge-water mixture enters the aerobic tank through the water inlet pipe at the bottom of the aerobic tank side wall, and aerobic phosphorus absorption reaction and nitrification reaction occur in the aerobic tank, so that the pollutants attached to the aerobic granular sludge are consumed, and the aerobic granular sludge returns to a hungry state; The aeration device at the bottom of the aerobic tank generates aeration, so that the first mud-water mixture flows upward to generate an upflow, and the upflow hits the impactor to generate a downflow, and the first mud-water mixture circulates from the upflow to the downflow to form a second mud-water mixture; The second mud-water mixture flows back to the anaerobic tank through the return port of the aerobic tank; When aerobic granular sludge with a higher concentration is needed, the second sludge-water mixture enters the sifter through the top opening of the aerobic tank side wall. Under the action of centrifugal force and fluid drag, most of the coarse aerobic granular sludge returns to the anaerobic tank through the third return pipe to continue to participate in the cycle reaction. The sewage is treated in the anaerobic tank and the aerobic tank and then discharged from the aerobic tank.

2. The method for treating sewage based on continuous flow aerobic granular sludge according to claim 1, characterized in that: The water inlet pipe penetrates the side wall of the aerobic pool and extends into the aerobic pool. The water inlet pipe is provided with a plurality of water outlet holes which are evenly distributed.

3. The sewage treatment method based on continuous flow aerobic granular sludge according to claim 1, characterized in that: It also includes a first reflux pipe, which is connected with the reflux port and the anaerobic tank.

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