Reciprocating bubbleless aeration membrane device and wastewater treatment system

Abstract

The application provides a reciprocating moving type bubble-free aeration membrane device and a sewage treatment system, and relates to the technical field of sewage treatment.The reciprocating moving type bubble-free aeration membrane device comprises a membrane structure, a stirrer and a driving structure; the driving structure comprises a driving assembly and a transmission assembly; the membrane structure and the transmission assembly are connected with the driving assembly, the membrane structure is connected with the stirrer, the driving assembly is used for driving the membrane structure and the stirrer to reciprocate, the transmission assembly is connected with the stirrer, and the driving assembly is also used for driving the stirrer to rotate through the transmission assembly.The reciprocating moving type bubble-free aeration membrane device can improve the stirring effect of an anoxic tank in a sewage treatment system, reduces the influence of the traditional decentralized sewage treatment system perforated pipe stirring or air-lift reflux stirring on the anoxic environment of the anoxic tank, and fully mixes the membrane structure, sludge and water.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, and particularly relates to a reciprocating moving type bubble-free aeration membrane device and a sewage treatment system. BACKGROUND

[0002] Rural or decentralized sewage treatment equipment plays an increasingly important role in the field of sewage treatment due to its flexible application, short processing period and wide application field. With the change of seasons and holidays, the rural population changes, resulting in great changes in sewage water quantity and quality. In the biological treatment method of sewage, the biofilm method is more and more widely used in the decentralized sewage treatment in rural areas due to its strong impact resistance, small sludge discharge and other characteristics.

[0003] As a kind of biofilm method, the membrane aerated biofilm reactor (MABR) is a high-efficiency sewage treatment process, which uses an oxygen permeable membrane as a carrier for biofilm growth, and realizes the removal of pollutants in sewage through the growth of microorganisms on the outer surface of the membrane. Due to its special material properties, MABR can realize bubble-free aeration and molecular oxygen transfer. This special oxygen supply mode makes MABR have an oxygen utilization rate close to 100%, and the oxygen transfer rate is 3-5 times that of traditional aeration methods.

[0004] Due to the high cost of MABR membrane materials, in the actual application process, considering the equipment investment cost, the biological reaction unit usually combines MABR membrane components with traditional sewage treatment processes. The MABR membrane components are generally placed in the anoxic zone. The aerobic microorganisms (with nitrifying bacteria as the dominant bacteria) on the surface of the MABR membrane in the anoxic zone and the denitrifying bacteria growing on the outermost layer of the membrane in the anoxic zone can realize simultaneous nitrification and denitrification, thereby strengthening the removal of total nitrogen, especially ammonia nitrogen, in the sewage and reducing the addition of external carbon source. Then the effluent from the anoxic zone enters the aerobic zone. Because the anoxic zone has achieved partial removal of ammonia nitrogen, the aeration quantity and residence time of the aerobic zone can be greatly shortened, and the return of nitrified liquid can be reduced. Therefore, MABR has great advantages over traditional biofilm processes and is a promising green and low-carbon sewage treatment technology.

[0005] However, in the process of combining MABR with traditional wastewater treatment process, the anoxic tank needs to be stirred to fully mix MABR membrane assembly, sludge and water. The existing stirring methods have two kinds: one is to use mechanical stirring device to achieve, for example, submersible agitator, but the rated power of submersible agitator is high, the power consumption is large, which is not suitable for decentralized wastewater treatment system, and the strong stirring power makes it difficult for the biofilm to adhere to the surface of MABR membrane, affecting the biofilm effect, and after the bubbleless aeration membrane assembly is installed in the anoxic zone, the membrane assembly will greatly affect the stirring effect of the submersible agitator; for example, the traditional vertical stirring paddle, but the membrane aeration biofilm reactor arranged in the middle of the anoxic tank will affect the installation of the traditional vertical stirring paddle. The second is to use gas stirring device, which realizes the stirring of the anoxic zone by air pump or fan through the air outlet pipeline (such as perforated pipe) under water. After the air is discharged through the perforated pipe, the oxygen in the air will generally enter the mixed liquid, affecting the anoxic environment, and the gas stirring is easy to produce dead zone, which is not conducive to the full mixing of MABR membrane assembly, sludge and water. SUMMARY

[0006] The application provides a reciprocating moving bubbleless aeration membrane device and a wastewater treatment system, which can improve the stirring effect of the anoxic tank, reduce the influence on the anoxic environment of the anoxic tank, and fully mix the membrane assembly, sludge and water.

[0007] In one aspect, the application provides a reciprocating moving bubbleless aeration membrane device, which comprises a membrane structure, an agitator and a driving structure.

[0008] The driving structure comprises a driving assembly and a transmission assembly.

[0009] The membrane structure and the transmission assembly are connected with the driving assembly, the membrane structure is connected with the agitator, and the driving assembly is used to drive the membrane structure and the agitator to reciprocate. The transmission assembly is connected with the agitator, and the driving assembly is also used to drive the agitator to rotate through the transmission assembly.

[0010] In one possible implementation, the reciprocating moving bubbleless aeration membrane device provided by the application further comprises a guide rail, the driving assembly is connected with the guide rail, and the driving assembly is used to drive the membrane structure and the agitator to reciprocate along the guide rail.

[0011] In one possible implementation, the reciprocating moving bubbleless aeration membrane device provided by the application, the driving assembly comprises a motor, a first swing rod, a second swing rod and a sliding block.

[0012] One end of the first swing rod is connected with the output shaft of the motor, the other end of the first swing rod is hinged with one end of the second swing rod, and the other end of the second swing rod is hinged with the sliding block.

[0013] The sliding block is connected with the membrane structure, and the sliding block is also connected with the guide rail in sliding mode.

[0014] In a possible implementation, the reciprocating bubbleless aeration membrane device provided by the application comprises a guide rail, and a sliding groove is formed in the guide rail, and the extension direction of the sliding groove is consistent with the guide rail.

[0015] The sliding block comprises a sliding block body, a first connecting part and a second connecting part, the first connecting part and the second connecting part are connected on the same side of the sliding block body, the first connecting part is embedded in the sliding groove and moves along the sliding groove, the second connecting part is located outside the sliding groove, the second connecting part is connected with the membrane structure, and the second swing rod is hinged to the side of the sliding block body away from the first connecting part and the second connecting part.

[0016] In a possible implementation, the reciprocating bubbleless aeration membrane device provided by the application comprises a transmission assembly, and the transmission assembly comprises a boss gear and a plane gear.

[0017] The boss gear is connected with one end of the second swing rod away from the first swing rod, and the second swing rod is hinged to the sliding block through the boss gear.

[0018] The plane gear is engaged with the boss gear, and the plane gear is further connected with the stirrer.

[0019] In a possible implementation, the reciprocating bubbleless aeration membrane device provided by the application comprises a membrane structure, and the membrane structure comprises a frame and a plurality of bubbleless aeration membrane units, each bubbleless aeration membrane unit is distributed in the frame, and the sliding block is connected with the frame.

[0020] In a possible implementation, the reciprocating bubbleless aeration membrane device provided by the application comprises a frame, and the frame is a square or a cylinder, one end of the frame close to the sliding block is connected with a sleeve, and the stirrer comprises a stirring shaft, the stirring shaft is arranged at the center of the frame through the sleeve.

[0021] In a possible implementation, the reciprocating bubbleless aeration membrane device provided by the application comprises a stirrer, and the stirrer further comprises stirring blades, one end of the stirring shaft, which extends out of the sleeve, is coaxially connected with the plane gear, and the other end of the stirring shaft, which extends out of the frame, is connected with the stirring blades.

[0022] On the other hand, the application provides a sewage treatment system, which comprises an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank arranged in sequence.

[0023] One side of the anaerobic tank is communicated with a water inlet pipe through a first water pass, and the bottom of the other side of the anaerobic tank is communicated with the anoxic tank through a second water pass.

[0024] The side of the anoxic tank away from the anaerobic tank is communicated with the aerobic tank through a third water pass, and the anoxic tank is provided with any one of the reciprocating bubbleless aeration membrane devices.

[0025] The side of the aerobic tank away from the anoxic tank is communicated with the sedimentation tank through a fourth water pass and a baffle, and the bottom of the aerobic tank is provided with an aeration system.

[0026] The sedimentation tank is connected to the outlet pipe on the side away from the aerobic tank through the fifth water outlet, and the sedimentation tank is also connected to the anaerobic tank through the return pipe.

[0027] In one possible implementation, the wastewater treatment system provided in this application includes a sludge return inlet in the return pipe, which is located at the bottom of the sedimentation tank.

[0028] The reciprocating mobile bubble-free aeration membrane device and wastewater treatment system provided in this application include a membrane structure, an agitator, and a drive structure. The drive structure includes a drive component and a transmission component. The drive component is connected to the membrane structure and the transmission component, the membrane structure is connected to the agitator, and the transmission component is connected to the agitator. This application integrates the agitator and the membrane structure together, which avoids mutual interference between the agitator and the membrane structure. Under the action of the drive component, the membrane structure and the agitator can reciprocate. At the same time, the drive component, under the transmission action of the transmission component, also drives the agitator to rotate, which can realize the agitation of sludge and water and prevent sludge accumulation at the bottom. In addition, by controlling the rotation of the agitator and the reciprocating movement of the agitator and the membrane structure through the drive structure, the reciprocating agitation and rotational agitation are combined, which helps to avoid sludge and water stratification caused by centrifugal force when the sludge-water mixture rotates, improves the agitation effect of sludge and water, and ensures that the membrane structure, sludge, and water are fully mixed. Attached Figure Description

[0029] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0030] Figure 1 A schematic diagram of the reciprocating moving bubble-free aeration membrane device provided in an embodiment of this application;

[0031] Figure 2 The reciprocating moving bubble-free aeration membrane device provided in the embodiments of this application is along Figure 1 A view in the Z-direction;

[0032] Figure 3 for Figure 1 Schematic diagram of the connection structure between the middle slider and the guide rail;

[0033] Figure 4 for Figure 1 A schematic diagram of a structure with a cylindrical middle frame;

[0034] Figure 5 for Figure 1 Schematic diagram of the connection structure between the middle membrane structure, the stirrer, and the planar gear;

[0035] Figure 6 A schematic diagram of the wastewater treatment system provided in the embodiments of this application. Figure 1 ;

[0036] Figure 7 Structure diagram of a sewage treatment system provided for an embodiment of the present application Figure 2 ;

[0037] Figure 8 Structure diagram of a sewage treatment system provided for an embodiment of the present application Figure 3 ;

[0038] Figure 9 Structure diagram of a sewage treatment system provided for an embodiment of the present application Figure 4 .

[0039] BRIEF DESCRIPTION OF THE DRAWINGS

[0040] 100 - membrane structure; 110 - frame; 111 - sleeve; 120 - bubbleless aeration membrane unit;

[0041] 200 - agitator; 210 - agitator shaft; 220 - agitator blade;

[0042] 300 - driving structure; 310 - driving assembly; 311 - motor; 312 - first swing lever; 313 - second swing lever; 314 - sliding block; 3141 - sliding block body; 3142 - first connecting part; 3143 - second connecting part; 320 - transmission assembly; 321 - boss gear; 322 - plane gear;

[0043] 400 - guide rail; 410 - sliding groove;

[0044] 001 - anaerobic tank; 0011 - water inlet pipe; 0012 - braided filler;

[0045] 002 - anoxic tank;

[0046] 003 - aerobic tank; 0031 - intercepting plate; 0032 - aeration system; 0033 - suspended filler;

[0047] 004 - sedimentation tank; 0041 - water outlet pipe; 0042 - backflow pipe; 0043 - sludge backflow inlet;

[0048] 005 - first water pass;

[0049] 006 - second water pass;

[0050] 007 - third water pass;

[0051] 008 - fourth water pass;

[0052] 009 - fifth water pass.

[0053] The specific embodiments of the application will be described in detail below with reference to the drawings. These drawings and the associated description are not intended to limit the scope of the application in any way, but merely to illustrate the principles of the application. DETAILED DESCRIPTION

[0054] The exemplary embodiments will be described in detail below with reference to the drawings. The following description is not intended to limit the scope of the application in any way, but merely to illustrate the principles of the application.

[0055] Those skilled in the art will understand that the embodiments are merely illustrative of the principles of the application, and are not intended to limit the scope of the application in any way. The embodiments can be modified in various ways, as needed, to suit specific applications.

[0056] It should be noted that, in the description of the application, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, or can be connected inside two components. Those skilled in the art can understand the specific meaning of the above terms in the application according to the specific circumstances.

[0057] It should also be noted that the terms "first", "second", "third", "fourth" and the like (if any) in the specification and claims of the application and the above drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented, for example, in an order other than that illustrated or described herein.

[0058] In addition, in the embodiments of the application, the words "exemplary" or "for example" are used to represent examples, illustrations or descriptions. Any embodiment or design scheme described as "exemplary" or "for example" in the application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the words "exemplary" or "for example" are intended to present the relevant concept in a specific manner.

[0059] First, the related concepts or terms involved in the application are explained:

[0060] Bubbleless aeration membrane: also known as membrane aeration biofilm reactor (MABR), is a kind of technology which combines membrane technology with biological reactor to treat organic wastewater. It uses gas permeable membrane as carrier to make the attached biofilm fully contact with sewage, so that the organic matter in sewage is adsorbed and oxidized by the biofilm, achieving the effect of purifying sewage. Among them, "bubbleless" means that when air or oxygen is introduced into the gas permeable membrane, the gas can be directly transmitted to the water body through the micropores on the membrane wall without forming visible bubbles.

[0061] As can be known from the background art, in the process of purifying wastewater by using the biological membrane method in the decentralized wastewater treatment system, the membrane aeration biofilm reactor is arranged in the anoxic tank. Under the anoxic condition, different microorganisms grow in layers on the membrane aeration biofilm reactor. The aerobic biofilm in the anoxic tank and the denitrifying bacteria suspended or attached to the outermost layer of the membrane can realize simultaneous nitrification and denitrification, so as to remove nitrogen and ammonia nutrients in the wastewater. By stirring the anoxic tank to improve the mixing degree of sludge and water, on the one hand, it helps to discharge the nitrogen produced by denitrification, and on the other hand, the flowing water layer can also promote the aged biofilm on the membrane aeration biofilm reactor to fall off easily to grow new biofilm, so as to improve the denitrification performance and achieve the effect of purifying wastewater. Therefore, the key factor to improve the denitrification performance is to fully mix the sludge and water by stirring the anoxic tank.

[0062] The existing stirring methods have two kinds: one is to use mechanical stirring device to realize, for example, submersible agitator, but the rated power of the submersible agitator is high, the power consumption is large, and it is not suitable for decentralized wastewater treatment system. Moreover, the strong stirring power makes it difficult for the biofilm to adhere to the surface of the MABR membrane, affecting the biofilm formation effect, and after the bubbleless aeration membrane assembly is installed in the anoxic zone, the membrane assembly will greatly affect the stirring effect of the submersible agitator; for example, the traditional vertical stirring paddle, but the membrane aeration biofilm reactor arranged in the middle of the anoxic tank will affect the installation of the traditional vertical stirring paddle. Two, use gas stirring device, air is introduced into the underwater gas outlet pipeline (such as perforated pipe) through air pump or fan to realize the stirring of the anoxic zone. After the air is discharged through the perforated pipe, the oxygen in the air will generally enter the mixed liquid, affecting the anoxic environment, and the gas stirring is easy to produce dead zone, which is not conducive to the full mixing of the MABR membrane assembly, sludge and water.

[0063] To address the aforementioned problems in the prior art, this application provides a reciprocating mobile bubble-free aeration membrane device and a wastewater treatment system. The reciprocating mobile bubble-free aeration membrane device includes a membrane structure, a stirrer, and a drive structure. The drive structure includes a drive component and a transmission component. The drive component is connected to the membrane structure and the transmission component, the membrane structure is connected to the stirrer, and the transmission component is connected to the stirrer. This application integrates the stirrer and the membrane structure together, avoiding mutual interference between the stirrer and the membrane structure. Under the action of the drive component, the membrane structure and the stirrer can reciprocate. At the same time, the drive component, under the transmission action of the transmission component, also drives the stirrer to rotate, which can achieve stirring of sludge and water and prevent sludge accumulation at the bottom. In addition, by controlling the rotation of the stirrer and the reciprocating movement of the stirrer and the membrane structure through the drive structure, the reciprocating stirring and rotational stirring are combined, which helps to avoid sludge and water stratification caused by centrifugal force during the rotation of the sludge-water mixture, improves the stirring effect of sludge and water, and ensures thorough mixing of the membrane structure, sludge, and water.

[0064] The technical solution of this application and how it solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0065] The following will refer to Figures 1 to 9 This application provides a detailed description of the reciprocating mobile bubble-free aeration membrane device and wastewater treatment system provided in the embodiments of this application.

[0066] Figure 1 A schematic diagram of the reciprocating moving bubble-free aeration membrane device provided in an embodiment of this application; Figure 2 The reciprocating moving bubble-free aeration membrane device provided in the embodiments of this application is along Figure 1 A view in the Z-direction.

[0067] On the one hand, combined with Figure 1 and Figure 2 As shown, this application provides a reciprocating moving bubble-free aeration membrane device, including a membrane structure 100, a stirrer 200, and a drive structure 300; the drive structure 300 includes a drive component 310 and a transmission component 320; the membrane structure 100 and the transmission component 320 are both connected to the drive component 310, the membrane structure 100 is connected to the stirrer 200, the drive component 310 is used to drive the membrane structure 100 and the stirrer 200 to reciprocate, the transmission component 320 is connected to the stirrer 200, and the drive component 310 is also used to drive the stirrer 200 to rotate through the transmission component 320.

[0068] By connecting the driving assembly 310 with the membrane structure 100, the driving assembly 310 can directly drive the membrane structure 100 to reciprocate; the membrane structure 100 is connected with the stirrer 200, the installation of the stirrer 200 and the membrane structure 100 in the pool does not interfere with each other, and under the driving of the driving assembly 310, the membrane structure 100 also facilitates the reciprocating movement of the stirrer 200; by connecting the driving assembly 310 with the stirrer 200 through the transmission assembly 320, the transmission assembly 320 converts the reciprocating movement output by the driving assembly 310 into rotary movement, so that the stirrer 200 can also rotate. As can be seen, the driving assembly 310 can drive the stirrer 200 to reciprocate and rotate, which is equivalent to combining reciprocating stirring and rotary stirring, which helps to avoid the stratification of sludge and water caused by centrifugal force when the sludge-water mixture rotates, improves the stirring effect of sludge and water, and fully mixes the sludge and water.

[0069] In the embodiment of the present application, a guide rail 400 is further included, the driving assembly 310 is connected with the guide rail 400, and the driving assembly 310 is used to drive the membrane structure 100 and the stirrer 200 to reciprocate along the guide rail 400.

[0070] By connecting the guide rail 400 with the driving assembly 310, under the action of the guide rail 400, the membrane structure 100 and the stirrer 200 reciprocate along the extension direction of the guide rail 400 under the driving action of the driving assembly 310, that is, move along the Figure 1 +X or -X direction, the moving path is linear, and the linear movement of the stirrer 200 and the membrane structure 100 in combination with the rotary movement of the stirrer 200 can improve the stirring effect and avoid the stratification of sludge and water caused by centrifugal force when the sludge-water mixture rotates.

[0071] Specifically, the length of the guide rail 400 can be flexibly set in combination with the width or length of the anoxic tank, so that the guide rail 400 can be arranged above the anoxic tank, and the driving assembly 310 can drive the membrane structure 100 and the stirrer 200 to move in the anoxic tank to realize the full mixing of sludge and water in the anoxic tank.

[0072] In the embodiment of the present application, the driving assembly 310 includes a motor 311, a first swing rod 312, a second swing rod 313, and a sliding block 314; one end of the first swing rod 312 is connected with the output shaft of the motor 311, the other end of the first swing rod 312 is hinged with one end of the second swing rod 313, the other end of the second swing rod 313 is hinged with the sliding block 314; the sliding block 314 is connected with the membrane structure 100, and the sliding block 314 is also slidingly connected with the guide rail 400.

[0073] In practice, the motor 311 is fixed to the wall of the anoxic tank, and the slide rail is connected above the anoxic tank. Based on the principle of a crank-slider, driven by the motor 311, the first rocker arm 312 swings with the output shaft of the motor 311, driving the second rocker arm 313 to swing. The second rocker arm 313 then drives the slider 314 to slide along the guide rail 400. Combined with... Figure 2 As shown, taking the clockwise rotation of the output shaft of motor 311 as an example, when the first rocker arm 312 rotates clockwise from... Figure 1 Rotate in the middle-X direction to Figure 1 During the X-axis movement, the drive slider 314 continuously moves away from the motor (i.e., slider 314 moves along...). Figure 1 Central-X direction to Figure 1 (Sliding linearly in the middle + X direction); when the first pendulum 312 moves clockwise from... Figure 1 Rotate to the center + X direction Figure 1 In the X-axis direction, the drive slider 314 continuously moves closer to the motor (i.e., slider 314 moves along...). Figure 1 +X direction to Figure 1 (Sliding linearly in the X direction). At the same time, slider 314 will also drive membrane structure 100 and agitator 200 to move together. It can be seen that, driven by motor 311, membrane structure 100 and agitator 200 can reciprocate along guide rail 400, promoting the flow of sewage in the anoxic tank and ensuring that membrane structure 100 is in full contact with sewage.

[0074] Figure 3 for Figure 1 A schematic diagram of the connection structure between the slider and the guide rail. (Combined with...) Figure 1 and Figure 3 As shown in this embodiment, the guide rail 400 is provided with a groove 410, and the extension direction of the groove 410 is consistent with the length direction of the guide rail 400; the slider 314 includes a slider body 3141, a first connecting part 3142 and a second connecting part 3143, the first connecting part 3142 and the second connecting part 3143 are connected to the same side of the slider body 3141, the first connecting part 3142 is embedded in the groove 410 and moves along the groove 410, the second connecting part 3143 is located outside the groove 410 and is connected to the membrane structure 100, and the second rocker arm 313 is hinged to the side of the slider body 3141 away from the first connecting part 3142 and the second connecting part 3143.

[0075] The first connecting part 3142, the second connecting part 3143, and the slider body 3141 can be integrated or separate, and the three can be fixedly connected by fasteners. The end of the second connecting part 3143 opposite to the slider body 3141 protrudes from the lower surface of the guide rail 400, so that after the second connecting part 3143 is fixedly connected to the membrane structure 100, there is a certain gap between the top surface of the membrane structure 100 and the lower surface of the guide rail 400, so as to prevent the membrane structure 100 from interfering with the guide rail 400 when it moves with the slider 314.

[0076] The shape of the first connecting part 3142 is adapted to the shape of the slide groove 410, and the first connecting part 3142 and the slide groove 410 are in clearance fit so that the slider 314 can slide smoothly along the slide groove 410. The position of the slide groove 410 on the guide rail 400 and the corresponding position of the first connecting part 3142 on the slider body 3141 can be flexibly adjusted according to actual needs, as long as the relative sliding of the slider 314 and the guide rail 400 is satisfied and the two are not easily separated during the sliding process. This application does not impose any restrictions on this.

[0077] Combination Figure 1 and Figure 2 As shown in the embodiment of this application, the transmission component 320 includes a boss gear 321 and a planar gear 322; the boss gear 321 is connected to the end of the second rocker arm 313 away from the first rocker arm 312, and the second rocker arm 313 is hinged to the slider 314 via the boss gear 321; the planar gear 322 meshes with the boss gear 321, and the planar gear 322 is also connected to the stirrer 200.

[0078] The boss gear 321 has a boss on the side facing away from the slider 314. The second rocker arm 313 is inserted into the side of the boss and is fixedly connected to the boss gear 321. The boss gear 321 is also hinged to the slider 314. Therefore, the boss gear 321 can rotate as the second rocker arm 313 swings.

[0079] As the slider 314 reciprocates along the guide rail 400, it also drives the stirrer 200 to rotate under the action of the transmission component 320. Taking the clockwise rotation of the output shaft of the motor 311 as an example, when the first rocker arm 312 rotates clockwise from... Figure 1 Rotate in the middle-Y direction to Figure 1 During the Y-axis rotation, the boss gear 321 rotates in the opposite direction to the first rocker arm 312, i.e., counterclockwise; when the first rocker arm 312 rotates clockwise from... Figure 1 Rotate in the middle and Y directions to Figure 1In the middle-Y direction, the boss gear 321 rotates in the same direction as the first swing rod 312, i.e., clockwise. As can be seen, as the moving position of the first swing rod 312 changes, the corresponding rotating direction of the boss gear 321 changes, so that the rotating direction of the planar gear 322 and the stirrer 200 also changes; further, according to the principle of the slider-crank, under the condition that the rotating speed of the motor 311 is constant, the translation speed of the slider 314 along the guide rail 400 changes during the movement of the slider 314, so that the translation speed of the planar gear 322 and the stirrer 200 also changes, thus under the driving of the driving structure 300, the operation of the stirrer 200 changes dynamically, and the stirring state formed also changes, and through the changed stirring mode, the sludge-water mixing effect can be further improved, and the short flow and dead zone phenomenon in the anoxic zone can be reduced.

[0080] Further, the output frequency of the motor 311 can be adjusted, so that the frequency of the membrane structure 100 moving back and forth along the guide rail 400 with the slider 314 can be adjusted.

[0081] The frequency of the membrane structure 100 moving back and forth with the slider 314 can be adjusted according to the actual operation effect and the biofilm formation of microorganisms on the bubbleless aeration membrane. In the early stage of system startup, the biofilm formation of microorganisms is relatively slow, and the back-and-forth movement frequency is low; after the system is stably operated, the biofilm formation of microorganisms is relatively stable, and the back-and-forth movement frequency can be appropriately increased according to the sludge concentration in the anoxic zone and the simultaneous nitrification and denitrification performance.

[0082] For example, the motor 311 is a variable frequency motor, and by changing the rotating speed of the motor 311, the sliding speed of the slider 314 along the guide rail 400 can be adjusted, and correspondingly, the rotating speed of the stirrer 200 can also be adjusted.

[0083] In the embodiment of the application, the membrane structure 100 includes a frame 110 and a plurality of bubbleless aeration membrane units 120, each bubbleless aeration membrane unit 120 is distributed in the frame 110, and the slider 314 is connected with the frame 110.

[0084] For example, the frame 110 is a three-dimensional structure connected by a plurality of columns, and the bubbleless aeration membrane units 120 are uniformly distributed in the internal space of the frame 110 and connected with the frame 110.

[0085] The second connecting part 3143 of the slider 314 is fixedly connected with the column at the top of the frame 110, and under the driving of the driving assembly 310, the frame 110 and the bubbleless aeration membrane units 120 move back and forth along the guide rail 400 with the slider 314, and in the moving process, the bubbleless aeration membrane units 120 are in full contact with the water flow, which facilitates the shedding of the aged biofilm thereon to grow new biofilm.

[0086] Further, the membrane structure 100 further comprises a gas supply assembly, the gas supply assembly comprising a gas supply main pipe, gas supply branch pipes and a tail gas discharge pipe, the gas supply main pipe being fixedly connected to the upper end of the membrane structure 100; the gas supply branch pipes being connected to each of the bubbleless aeration membrane units 120 for supplying gas to each of the bubbleless aeration membrane units 120; and the tail gas discharge pipe being used for collecting process tail gas of the membrane structure 100 and flushing the membrane structure 100.

[0087] Through the gas supply assembly, sufficient gas is provided to the bubbleless aeration membrane units 120, and oxygen is transmitted to the sewage through the bubbleless aeration membrane units 120, and some aerobic microorganisms are enriched on the membrane side close to the sewage, thereby forming a biofilm, so that oxygen and pollutants are mass transferred from both sides of the biofilm in the form of convective diffusion and gradually consumed.

[0088] Figure 4 For Figure 1 Structure diagram of the middle frame as a cylinder; Figure 5 For Figure 1 Structure diagram of the connection of the membrane structure, the stirrer and the plane gear. As shown in Figure 1 , Figure 4 and Figure 5 In the embodiment of the present application, the frame 110 is a cuboid or a cylinder, one end of the frame 110 close to the sliding block 314 is connected with a sleeve 111, and the stirrer 200 comprises a stirring shaft 210, the stirring shaft 210 is arranged at the shaft center of the frame 110 through the sleeve 111.

[0089] One end of the stirring shaft 210 close to the sliding block 314 is arranged in the sleeve 111, and the side wall of the stirring shaft 210 is connected with the sleeve 111 through a bearing; one end of the stirring shaft 210 away from the sliding block 314 is arranged in the frame 110 and avoids the bubbleless aeration membrane units 120 in the frame 110.

[0090] As shown in Figure 5 In the embodiment of the present application, the stirrer 200 further comprises stirring blades 220, one end of the stirring shaft 210 extending out of the sleeve 111 is coaxially connected with the plane gear 322, and the other end of the stirring shaft 210 extending out of the frame 110 is connected with the stirring blades 220.

[0091] In specific implementation, the plane gear 322 drives the stirring shaft 210 to rotate, the stirring shaft 210 rotates relative to the sleeve 111 and the frame 110, and drives the stirring blades 220 connected to the stirring shaft 210 to rotate, wherein the stirring blades 220 are located at the bottom end of the frame 110, so that after the membrane structure 100 is put into the anoxic tank 002, the stirring blades 220 are close to the bottom of the anoxic tank 002, and the stirring blades 220 rotate at the bottom of the anoxic tank 002, which can agitate the sludge at the bottom, effectively prevent the sludge from accumulating at the bottom, and promote the mixing of the sludge and water.

[0092] Figure 6 Structure diagram of sewage treatment system provided by the embodiment of the present application Figure 1 .

[0093] In another aspect, in combination with Figure 6 , the present application provides a sewage treatment system, comprising an anaerobic tank 001, an anoxic tank 002, an aerobic tank 003 and a sedimentation tank 004 arranged in sequence;

[0094] One side of the anaerobic tank 001 is communicated with the water inlet pipe 0011 through the first water pass 005, and the bottom of the other side of the anaerobic tank 001 is communicated with the anoxic tank 002 through the second water pass 006;

[0095] The side of the anoxic tank 002 away from the anaerobic tank 001 is communicated with the aerobic tank 003 through the third water pass 007, and the anoxic tank 002 is provided with any one of the reciprocating moving type bubbleless aeration membrane devices described above;

[0096] The side of the aerobic tank 003 away from the anoxic tank 002 is communicated with the sedimentation tank 004 through the fourth water pass 008 and the intercepting plate 0031, and the bottom of the aerobic tank 003 is provided with an aeration system 0032;

[0097] The side of the sedimentation tank 004 away from the aerobic tank 003 is communicated with the water outlet pipe 0041 through the fifth water pass 009, and the sedimentation tank 004 is also communicated with the anaerobic tank 001 through the reflux pipe 0042.

[0098] In specific implementation, the sewage enters the anaerobic tank 001 through the water inlet pipe 0011, and is mixed with the sludge refluxed to the anaerobic tank 001 from the sedimentation tank 004 through the reflux pipe 0042, under the anaerobic condition in the anaerobic tank 001, microorganisms utilize the sludge and organic matter to produce a large amount of carbon dioxide, methane and other gases, so as to reduce the biochemical oxygen demand and chemical oxygen demand value of the sewage;

[0099] The sewage treated by the anaerobic tank 001 enters the anoxic tank 002 through the second water pass 006, under the anoxic condition in the anoxic tank 002, different microorganisms grow in layers on the moving type bubbleless aeration membrane device, ammonia oxidation occurs on the surface of the membrane, and denitrification occurs on the outside of the membrane and in the anoxic tank, so as to remove carbon and nitrogen pollutants;

[0100] The sewage treated by the anoxic tank 002 enters the aerobic tank 003 through the third water pass 007, under the aerobic condition in the aerobic tank 003, microorganisms adsorb and chemically react with organic matter, so as to decompose the organic matter into inorganic matter, consume oxygen and release carbon dioxide and water;

[0101] The sewage treated by the aerobic tank 003 enters the sedimentation tank 004 through the fourth water pass 008 to separate the sludge and water, and the supernatant after separation is discharged through the water outlet pipe 0041.

[0102] Exemplarily, the sludge return ratio is 0; the nitrification liquid return amount is 0;

[0103] The dissolved oxygen concentration of the anaerobic tank 001 is less than 0.2 mg / L, the hydraulic retention time is 1-2 h, and the sludge concentration is 3500-6000 mg / L;

[0104] The dissolved oxygen concentration of the anoxic tank 002 is less than 0.5 mg / L, the hydraulic retention time is 3-5 h, and the activated sludge concentration is 2000-3500 mg / L;

[0105] The dissolved oxygen concentration in the aerobic tank 003 is 1-2 mg / L, the hydraulic retention time is 2-4 h, and the activated sludge concentration is 2000-4000 mg / L.

[0106] The surface load of the sedimentation tank 004 is 0.5-1.0 m 3 / (m 2 ·h); the sludge return ratio of the sludge in the sedimentation tank 004 into the anaerobic tank 001 is 0-100%, preferably 80%-100%.

[0107] It should be noted that the anaerobic tank 001 is a sludge granulation reaction zone characterized by lack of sufficient oxygen, mainly used for pretreatment of organic wastewater, which can promote sludge granulation and increase the efficiency of subsequent treatment. The anoxic tank 002 is a treatment method with anoxic bottom and oxygen-rich water surface, mainly used for advanced treatment of wastewater. The anoxic tank 002 can also stabilize the system by microbial uptake and transformation of waste components when the organic load reaches a peak, preventing nitrification collapse. The aerobic tank 003 is an oxygenated reaction zone, mainly used for oxidizing organic matter in wastewater. The sedimentation tank 004 is provided with inclined guide surfaces on both sides of the tank wall to promote the aggregation of sludge to the middle of the tank bottom, facilitating the entry of the sludge into the anaerobic tank 001 through the return pipe 0042.

[0108] Among them, the motor 311 of the reciprocating movable bubble-free aeration membrane device is connected to the tank wall of the anoxic tank 002, the slide rail is connected above the anoxic tank 002, and the membrane structure 100 and the agitator 200 can reciprocate in the anoxic tank 002 along the guide rail 400, while the agitator 200 rotates to realize the stirring treatment of the anoxic tank 002. By placing the reciprocating movable bubble-free aeration membrane device in the anoxic tank 002, the membrane structure, sludge and water in the anoxic tank 002 are fully mixed, while the influence on the anoxic environment in the anoxic tank 002 is reduced.

[0109] By setting the membrane structure 100 in the anoxic tank 002, it is helpful to realize the full use of the organic carbon source in the influent, to strengthen the effect of simultaneous nitrification and denitrification in the system, to reduce the dependence on external carbon source, to save the residence time and aeration quantity of the aerobic tank, and to shorten the ammonia nitrogen load of the aerobic tank 003 without the need of nitrification liquid reflux, so as to improve the nitrification and denitrification performance, shorten the residence time of the aerobic tank 003, reduce the land occupation, and simplify the process flow. The aeration system 0032 is used for injecting air or oxygen into the water aerobic tank 003 to maintain a certain dissolved oxygen concentration in the aerobic tank 003 to meet the oxygen amount required by microbial metabolism. The aeration system 0032 can also promote the circulation flow of the sewage in the aerobic tank 003, accelerate the oxidation and decomposition of the organic matter in the sewage, improve the water quality, and purify the wastewater.

[0110] Figure 7 Structure diagram of the sewage treatment system provided in the embodiment of the present application Figure 2 . As shown in Figure 7 , in another embodiment of the present application, the aerobic tank 003 is provided with suspended filler 0033. The suspended filler 0033 belongs to a kind of biological filler, which is a multi-faceted hollow ball for removing chlorine, oxygen or carbon dioxide, has the characteristics of high gas velocity, many blades and small resistance, and has a large specific surface area, which can fully solve the gas-liquid exchange in the aerobic tank 003. When the suspended filler 0033 is arranged in the aerobic tank 003, the intercepting plate 0031 is arranged on the side of the fourth water passageway 008 facing the aerobic tank 003 to limit the suspended filler 0033 from entering the sedimentation tank 004 through the fourth water passageway 008.

[0111] Figure 8 Structure diagram of the sewage treatment system provided in the embodiment of the present application Figure 3 . As shown in Figure 8 , in another embodiment of the present application, the anaerobic tank 001 is provided with a braided filler 0012. The braided filler 0012 belongs to a kind of biological filler, and the whole braided filler 0012 is a fiber rope, which is easy to form a biofilm, increases the biomass, and helps to provide a place for microorganisms to survive, grow and reproduce in the anaerobic tank 001.

[0112] Figure 9 Structure diagram of the sewage treatment system provided in the embodiment of the present application Figure 4 . As shown in Figure 9 , in another embodiment of the present application, appropriate fillers can be arranged in the anaerobic tank 001, the anoxic tank 002 and the aerobic tank 003 to improve the impact resistance of the sewage treatment system. The operator can flexibly adjust the start and stop of sludge reflux according to the actual inflow situation, switch the pure membrane method or the sludge-membrane mixed method, so as to increase the flexibility of the operation of the sewage treatment system.

[0113] In the embodiment of the present application, the reflux pipe 0042 comprises a sludge reflux inlet 0043, which is arranged at the bottom of the sedimentation tank 004.

[0114] Wherein, the reciprocating bubbleless aeration membrane device has been described in detail in the above embodiment, and will not be repeated here.

[0115] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0116] It is to be understood that the application is not limited to the precise structures hereinabove described and shown in the drawings, for purposes of illustration and determination of the requirements of priority, and that changes in form and substitution of equivalents can be made by those skilled in the art without departing from the scope of the application. The scope of the application is limited only by the claims appended hereto.

Claims

1. A reciprocating moving bubble-free aeration membrane device, characterized in that, Includes membrane structure, stirrer, and drive structure; The drive structure includes a drive assembly and a transmission assembly; The membrane structure and the transmission assembly are both connected to the drive assembly. The membrane structure is connected to the stirrer. The drive assembly is used to drive the membrane structure and the stirrer to reciprocate. The transmission assembly is connected to the stirrer. The drive assembly is also used to drive the stirrer to rotate through the transmission assembly. It also includes a guide rail, and the drive assembly is connected to the guide rail. The drive assembly is used to drive the membrane structure and the stirrer to reciprocate along the guide rail. The drive assembly includes a motor, a first pendulum, a second pendulum, and a slider; One end of the first swing arm is connected to the output shaft of the motor, the other end of the first swing arm is hinged to one end of the second swing arm, and the other end of the second swing arm is hinged to the slider; The slider is connected to the membrane structure, and the slider is also slidably connected to the guide rail; The transmission assembly includes a boss gear and a planar gear; The boss gear is connected to the end of the second rocker arm that is away from the first rocker arm, and the second rocker arm is hinged to the slider via the boss gear; The planar gear meshes with the boss gear, and the planar gear is also connected to the agitator; The membrane structure includes a frame and multiple bubble-free aeration membrane units, each of the bubble-free aeration membrane units being distributed within the frame, and the slider being connected to the frame. The frame is a cuboid or a cylinder, and a sleeve is connected to one end of the frame near the slider. The stirrer includes a stirring shaft, which passes through the sleeve and is positioned at the center of the frame. The stirrer also includes stirring blades, one end of the stirring shaft extending out of the sleeve is coaxially connected to the planar gear, and one end of the stirring shaft extending out of the frame is connected to the stirring blades.

2. The reciprocating moving bubble-free aeration membrane device according to claim 1, characterized in that, The guide rail is provided with a sliding groove, and the extension direction of the sliding groove is consistent with that of the guide rail; The slider includes a slider body, a first connecting part and a second connecting part. The first connecting part and the second connecting part are connected to the same side of the slider body. The first connecting part is embedded in the slide groove and moves along the slide groove. The second connecting part is located outside the slide groove and is connected to the membrane structure. The second swing arm is hinged to the side of the slider body opposite to the first connecting part and the second connecting part.

3. A wastewater treatment system, characterized in that, It includes an anaerobic tank, an anoxic tank, an aerobic tank, and a sedimentation tank arranged in sequence; One side of the anaerobic tank is connected to the inlet pipe through the first water outlet, and the bottom of the other side of the anaerobic tank is connected to the anoxic tank through the second water outlet. The anoxic tank is connected to the aerobic tank on the side away from the anaerobic tank through a third water outlet. The anoxic tank is equipped with a reciprocating moving bubble-free aeration membrane device as described in claim 1 or 2. The aerobic tank is connected to the sedimentation tank on the side away from the anoxic tank through a fourth water outlet and a baffle plate. An aeration system is provided at the bottom of the aerobic tank. The sedimentation tank is connected to the outlet pipe via a fifth water outlet on the side opposite to the aerobic tank, and the sedimentation tank is also connected to the anaerobic tank via a return pipe.

4. The wastewater treatment system according to claim 3, characterized in that, The return pipe includes a sludge return inlet, which is located at the bottom of the sedimentation tank.

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