Portable modular sewage treatment device

Abstract

The invention relates to the technical field of sewage treatment, in particular to a portable modular sewage treatment device, which is characterized in that a sewage pretreatment module, a biological treatment module and a post-treatment module are distributed in a stepped manner, and each module comprises a pretreatment tank and a reflux transition tank which are independently controlled; four sets of trapezoidal grating nets with gradually-changed apertures are arranged in the circumferential direction, filter nets are switched through a swing assembly driven by a waterproof servo motor, a gear transmission mechanism and a ball screw are linked through the same motor, a pump suction box is driven to generate backflow power, and secondary / multiple times of sewage filtering is achieved; the problems that a traditional grid is large in occupied space, low in filtering efficiency and insufficient in flexibility are effectively solved, and the grid has the advantages of being compact in structure, intelligent in operation and thorough in filtering and is suitable for distributed and emergency sewage treatment scenes.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, in particular to a portable modular sewage treatment device. Background Art

[0002] The modular biological wastewater treatment unit is a flexible, efficient, and scalable wastewater treatment technology that removes organic pollutants, nitrogen, phosphorus, and other nutrients from wastewater through biodegradation. Its core feature is the breakdown of traditional wastewater treatment processes (such as A / O, SBR, and MBR) into standardized modules that can be flexibly combined based on water quality and quantity requirements. It is suitable for decentralized wastewater treatment and emergency response scenarios.

[0003] Modular sewage treatment involves multiple modules, such as pretreatment module, biological treatment module, post-treatment module, etc. The pretreatment module is mainly used to remove large suspended solids (SS), fibers, gravel, etc., to protect the subsequent biological module. The common method is to combine coarse screen + fine screen, that is, the sewage to be treated is pre-filtered through the screen, and then transferred to the subsequent module for further treatment. However, in the pretreatment process, the distribution of coarse screen and fine screen is often arranged in an intermittent manner, that is, according to the flow of water, it passes through the coarse and fine screens. Although it can achieve sewage treatment to a certain extent, it still has the following defects during use: the horizontally spaced screens need to occupy a large space, and during filtration, each screen can only be filtered once. Due to the diverse and complex particle sizes in sewage, it is often impossible to effectively filter a filter with a single pore size in a single pass (repeated filtration is required to achieve the desired effect). Finally, the existing sewage treatment device is obviously insufficient in operation and operational flexibility, and cannot be conveniently controlled according to filtration requirements, resulting in limited operating efficiency. In this regard, this technical solution designs a convenient modular sewage treatment device to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a convenient modular sewage treatment device to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A convenient modular sewage treatment device comprises a sewage pretreatment module, a sewage biological treatment module, and a sewage post-treatment module; the sewage pretreatment module, the sewage biological treatment module, and the sewage post-treatment module are sequentially lowered and connected in a stepped manner to form a stepped modular sewage treatment process, and at the same time, the water flow in each module of the sewage pretreatment module, the sewage biological treatment module, and the sewage post-treatment module can be independently controlled so that the sewage placed in each module can be fully treated, the sewage pretreatment module, the sewage biological treatment module, and the sewage post-treatment module all include a pretreatment tank and a return flow transition tank, a water inlet is provided on one side of the top of the pretreatment tank, and a drainage hole is provided on the lower part of the side wall of the return flow transition tank, and the drainage holes and water inlets between adjacent sewage pretreatment modules, sewage biological treatment modules, and sewage post-treatment modules are connected to each other, so as to realize that the sewage is transmitted along the sewage pretreatment module, the sewage biological treatment module, and the sewage post-treatment module under the action of gravity; Among them, a group of adjustable filter grid bins are opened at the connection between the pretreatment tank and the return transition tank in the sewage pretreatment module. A filtration channel running through the pretreatment tank and the return transition tank is opened on the lower side of the adjustable filter grid bin. A group of adjustable filter grids are rotatably set inside the adjustable filter grid bin. The adjustable filter grid is controlled to rotate and adjust the filter screens with different filter holes to be transferred to the filtration channel, so as to filter the sewage flowing from the pretreatment tank to the return transition tank, that is, to realize the rapid switching of the filter screen to filter different particulate impurities in the sewage; A set of swing components is provided inside the adjustable filter grid bin on the lower side of the adjustable filter grid. A set of levers is provided on the top of the swing component. The levers move along the rotating slideway, that is, the levers swing along the bottom of the trapezoidal grid mesh at the lowest side and between the lever slides on both sides thereof, thereby continuously shifting different trapezoidal grid meshes to the filtering channel, switching trapezoidal grid meshes with different apertures for filtering operation; A reflux system is connected between the pretreatment tank and the bottom of the return transition tank. The driving end of the reflux system is connected to the control end of the adjustable filter grid. That is, the power of the filter is switched by means of the adjustable filter grid to control the sewage input into the return transition tank to flow back into the pretreatment tank for secondary filtration. The pore size of the filter can be selected according to the impurities in the filtered wastewater.

[0006] Compared with the prior art, the present invention has the following beneficial effects: The vertically distributed trapezoidal grid replaces the horizontal spacing layout to reduce the floor space; One-touch switching of four sets of gradient pore size filters supports single or multiple cycle filtration to adapt to complex sewage particle distribution; A single motor is used to synchronously drive the filter switching and sewage return pump suction to reduce energy consumption; Through independent water flow control of each treatment module and combined with control valves, on-demand diversion is achieved to improve operational flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a schematic diagram of the stepped distribution of a convenient modular sewage treatment device.

[0008] Figure 2 This is a perspective structural diagram of a sewage pretreatment module in a convenient modular sewage treatment device.

[0009] Figure 3 This is a structural schematic diagram from perspective 2 of a sewage pretreatment module in a convenient modular sewage treatment device.

[0010] Figure 4 This is a structural schematic diagram from three perspectives of a sewage pretreatment module in a convenient modular sewage treatment device.

[0011] Figure 5 This is a schematic diagram of the main structure of a sewage pretreatment module in a convenient modular sewage treatment device.

[0012] Figure 6 This is a schematic diagram of the partial structure of the pretreatment tank in a convenient modular sewage treatment device.

[0013] Figure 7 This is a structural schematic diagram of an adjustable filter screen in a convenient modular sewage treatment device.

[0014] Figure 8 for Figure 4 Schematic diagram of the enlarged structure of A in the figure.

[0015] Figure 9 This is a structural schematic diagram of a pump suction box in a convenient modular sewage treatment device.

[0016] Among them: pretreatment tank 10, return transition tank 11, water inlet 12, drainage hole 13, guide plate 14, return plate 15, filtration channel 16, adjustable filter screen bin 17, drain hole 18, adjustable filter screen 19, trapezoidal screen 20, toggle chute 21, rotating shaft 22, waterproof servo motor 23, swing rod I 24, swing rod II 25, swing rod III 26, swing rod IV 27, transmission belt 28, pulley 29, gear shaft 30, driving spur gear plate 31, driven spur gear plate 32, bevel gear I 34, bevel gear II 35, ball screw 36, ball nut 37, L-shaped connecting rod 38, pump suction box 39, piston plate 40, water inlet 41, water outlet 42, elastic water inlet sealing plate 43, elastic water outlet sealing plate 44, return pipe 45, water collecting pipe 46, rear discharge pipe 47, control valve 48, anti-leakage retaining ring 49, shift lever 50, diverter pipe 51, collecting pipe 52; Sewage pre-treatment module 60 , sewage biological treatment module 70 , sewage post-treatment module 80 . DETAILED DESCRIPTION

[0017] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0018] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0019] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0020] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0021] See also Figure 1A convenient modular sewage treatment device includes a sewage pretreatment module 60, a sewage biological treatment module 70, and a sewage post-treatment module 80; the sewage pretreatment module 60, the sewage biological treatment module 70, and the sewage post-treatment module 80 are sequentially connected in a stepped manner to form a stepped modular sewage treatment process. At the same time, the water flow in each module of the sewage pretreatment module 60, the sewage biological treatment module 70, and the sewage post-treatment module 80 can be independently controlled so that the sewage placed in each module can be fully treated. The sewage pretreatment module 60, Each of the sewage biological treatment module 70 and the sewage post-treatment module 80 includes a pre-treatment tank 10 and a return transition tank 11. A water inlet 12 is provided on one side of the top of the pre-treatment tank 10, and a drainage hole 13 is provided on the lower portion of the side wall of the return transition tank 11. The drainage holes 13 and the water inlet 12 between adjacent sewage pre-treatment modules 60, sewage biological treatment modules 70, and sewage post-treatment modules 80 are interconnected, so as to realize that sewage is transported along the sewage pre-treatment module 60, sewage biological treatment module 70, and sewage post-treatment module 80 under the action of gravity; like Figure 2-Figure 7 As shown, a group of adjustable filter grid bins 17 are provided at the connection between the pretreatment tank 10 and the return transition tank 11 in the sewage pretreatment module 60. A filter channel 16 is provided on the lower side of the adjustable filter grid bin 17, which runs through the pretreatment tank 10 and the return transition tank 11. A group of adjustable filter grids 19 are rotatably provided inside the adjustable filter grid bin 17. The adjustable filter grids 19 are controlled to rotate and adjust the filter screens with different filter holes to be transferred to the filter channel 16, so as to filter the sewage flowing from the pretreatment tank 10 to the return transition tank 11, that is, to realize the rapid switching of the filter screens to filter different particulate impurities in the sewage. Specifically, the adjustable filter grille 19 is configured to have a quasi-square structure, a rotating shaft 22 is installed at the center, and both ends of the rotating shaft 22 are rotatably connected to the inner wall of the adjustable filter grille bin 17 through bearings. Four groups of trapezoidal grille nets 20 with successively varying apertures are evenly arranged on the upper edge of the adjustable filter grille 19. The shape and area of ​​the trapezoidal grille nets 20 are the same as those of the filter channel 16. The rotating shaft 22 is rotated to adjust the trapezoidal grille nets 20 with different filter holes to be placed in the filter channel 16, thereby filtering the sewage flowing through the filter channel 16. A toggle chute 21 is provided between adjacent trapezoidal grille nets 20, and the ends of the toggle chute 21 away from the rotating shaft 22 are configured to be open. The outer ends of adjacent toggle chute 21 are connected in an arc shape to the trapezoidal grille nets 20 on both sides, and the bottom wall of the trapezoidal grille net 20 relative to the rotating shaft 22 is configured to be an inwardly recessed arc structure, so as to form a rotating slide between the toggle chute 21 and the bottom wall of the trapezoidal grille net 20; A set of swing components is provided inside the adjustable filter grid bin 17 on the lower side of the adjustable filter grid 19. A set of levers 50 are provided on the top of the swing component. The levers 50 move along the rotating slideway, that is, the levers 50 swing between the bottom of the trapezoidal grid mesh 20 rotated to the lowermost side and the toggle slides 21 on both sides thereof, thereby continuously toggling different trapezoidal grid meshes 20 to the filtering channel 16, switching the trapezoidal grid meshes 20 with different apertures for filtering operation; Specifically, the swing assembly includes a waterproof servo motor 23 fixed to one side of the interior of the adjustable filter grille bin 17, the output end of the waterproof servo motor 23 is connected to a swing rod I 24, the end of the swing rod I 24 rotates through the swing rod IV 27 to rotate and connect a group of V-shaped swing rods III 26, the upper end of the swing rod III 26 is installed with a dial rod 50, and the other end is rotatably connected to the swing rod II 25 through the swing rod IV 27, and the end of the swing rod II 25 away from the swing rod III 26 is rotatably connected to a fixed seat fixed to the inner bottom wall of the adjustable filter grille bin 17 through the swing rod IV 27, that is, by starting the waterproof servo motor 23 to drive the swing rod I 24 to rotate, and then drive the swing rod III 26 to control the top dial rod 50 to slide along the toggle slide 21 and the bottom of the trapezoidal grille net 20, and at the same time, the swing rod II 25 supports it to swing, thereby realizing automatic switching of the trapezoidal grille nets 20 with different filter holes; A reflux system is provided between the pretreatment tank 10 and the bottom of the return transition tank 11. The drive end of the reflux system is connected to the control end of the adjustable filter screen 19. That is, the power of the adjustable filter screen 19 is used to switch the filter screen, and the sewage input into the return transition tank 11 is controlled to flow back into the pretreatment tank 10 for secondary filtration. The pore size of the filter screen can be selected according to the impurities in the filtered wastewater (that is, it can be a primary filtration or a filter screen with larger or smaller pores can be replaced); like Figure 3 、 Figure 4 、 Figure 6 、 Figure 8 、 Figure 9 As shown, the return system includes a U-shaped return pipe 45 connected between the pretreatment tank 10 and the bottom of the return transition tank 11. A group of pump suction boxes 39 are connected to one side of the middle of the return pipe 45. The pump suction box 39 provides pump suction for the sewage in the return pipe 45 to flow back from the return transition tank 11 to the pretreatment tank 10. A lifting component is provided on one side of the top of the pump suction box 39. The lifting component is connected to the swing component. That is, when the swing component is in operation, the lifting component amplifies the rotation frequency of the kinetic energy, and then drives it to circulate and rise rapidly, and then controls the high-intensity suction inside the pump suction box 39 to promote the return of sewage. Specifically, a piston channel with a columnar structure is provided inside the pump suction box 39, and a piston plate 40 is connected to the piston channel for lifting. An L-shaped connecting rod 38 is connected to the middle of the top of the piston plate 40. One side of the top of the L-shaped connecting rod 38 is connected to the lifting component. Water inlets 41 and water outlets 42 are symmetrically provided on the side walls on both sides of the piston channel. The outer ends of the water inlets 41 and the water outlets 42 are respectively connected to the return pipe 45. The water inlet 41 is elastically swung inside and is connected to an elastic water inlet sealing plate 43 that swings toward the inside of the piston channel. The water outlet 42 is internally connected to an elastic water outlet sealing plate 44 that swings toward the outside of the piston channel. That is, when the piston plate 40 rises, an upward suction force is generated. At this time, the elastic water inlet sealing plate 43 swings to open the water inlet 41, and the sewage enters the lower side of the piston channel. When the piston plate 40 descends, the water outlet 42 swings outward and the water inlet 41 is closed. At this time, pressure is applied to the incoming sewage, and it is discharged along the water outlet 42. This repeated operation can automatically return the sewage along the return pipe 45 to the pretreatment tank 10; The lifting assembly includes a ball nut 37 connected to the end of an L-shaped connecting rod 38, a vertical ball screw 36 is threadedly connected to the middle of the ball nut 37, a bevel gear II 35 is installed on the top of the ball screw 36 through a connecting rod, and a bevel gear I 34 is vertically meshed on one side of the bevel gear II 35. A driven straight tooth plate 32 is connected to the top of the driven straight tooth plate 32 with an active straight tooth plate 31. The middle of the active straight tooth plate 31 is connected to a gear shaft 30. The gear shaft 30 extends movably into the adjustable filter screen bin 17 and is connected to a set of rotating rods. One end of the rotating rod supports a sleeve rod. For positioning, a pulley 29 is installed on the rotating rod, and the pulley 29 is rotatably connected to the output shaft of the waterproof servo motor 23 through the transmission belt 28. That is, when the waterproof servo motor 23 is running, under the connection of the transmission belt 28 and the pulley 29, it drives 33 to rotate, and then drives the active spur gear 31, the driven spur gear 32, the bevel gear I 34, and the bevel gear II 35 to rotate, and then controls the ball screw 36 to drive the ball nut 37 to rise and fall along its axial direction, and then controls the piston plate 40 to move up and down in a circular motion under the connection of the L-shaped connecting rod 38, so as to realize the pumping and backflow of the sewage in the return pipe 45.

[0022] In an embodiment of the present invention, a group of guide plates 14 inclined toward one side of the filter channel 16 are installed inside the pretreatment tank 10, which are used to guide the sewage input through the water inlet 12 to be concentrated toward the inlet end of the filter channel 16, that is, to accelerate the flow rate of sewage filtration. At the same time, a group of return plates 15 facing the outlet end of the filter channel 16 are provided inside the return transition tank 11. A row of drain holes 18 are opened inside the return transition tank 11 corresponding to the bottom end of the return plate 15, and the guiding and limiting function of the return plate 15 is utilized to control the discharged sewage to be concentrated on the upper side of the drain hole 18 and then quickly transmitted downward. The bottom of the drain hole 18 is connected to a water collecting pipe 46, the bottom of the water collecting pipe 46 is connected to the reflux system, and the side is connected to a rear discharge pipe 47, and the end of the rear discharge pipe 47 is connected to the drainage hole 13 on the side wall of the return transition tank 11; 47. The return system is provided with a control valve 48, that is, the subsequent flow direction is determined according to the result of sewage filtration. If the sewage needs to be filtered again, it is transferred to the return system by controlling the control valve 48. If it does not need to be filtered and is discharged backward, the sewage is transferred to the rear discharge pipe 47 and then transferred to the next module through the drainage hole 13.

[0023] The inlet and outlet ends of the filter channel 16 are both provided with anti-leakage retaining rings 49. The inner side of the anti-leakage retaining ring 49 is in sliding elastic sealing contact with the side of the trapezoidal grid mesh 20 swung to the filter channel 16, thereby ensuring that the sewage flowing along the filter channel 16 only flows along the trapezoidal grid mesh 20 and will not leak into the interior of the adjustable filter grid bin 17.

[0024] In one embodiment of the present invention, a guide rod is installed at the bottom end of the ball screw 36, and the guide rod is fixed to the pump suction box 39 through a support sleeve rod. At the same time, a support rod is connected to one side of the middle of the driven spur gear plate 32 and is rotatably connected to the inner wall of the pretreatment tank 10 through a bearing; Since the rotation time and angle of the waterproof servo motor 23 are limited when it rotates to control the switching of the trapezoidal grille 20, the required pump suction force is relatively large when controlling the utilization of sewage in the return pipe 45. Therefore, the lifting and lowering frequency of the piston plate 40 in the pump suction box 39 is required to be relatively high. Therefore, by setting the active spur gear 31 to mesh with the driven support spur gear 32, the gear or gear radius of the active spur gear 31 is several times that of the driven support spur gear 32. Under the condition that the number of rotations of the active spur gear 31 is limited, the driven support spur gear 32 can be driven to rotate several times. Then, under the meshing of the bevel gear I 34 and the bevel gear II 35, the ball screw 36 is controlled to rotate at a high frequency, thereby driving the ball nut 37 to control the piston plate 40 to rotate repeatedly, thereby improving the generated pump suction force; The ratio of the number of teeth between the active spur gear disc 31 and the driven spur gear disc 32 can be set according to actual conditions and will not be described in detail here. During the specific design, multiple factors such as the flow rate of sewage, the specific size of the pretreatment tank 10 and the return transition tank 11 need to be considered. This technical solution only provides a solution direction, and the details need to be determined according to actual requirements.

[0025] As a preferred embodiment of the present invention, the outer sides of the water inlet 41 and the water outlet 42 are connected to the return pipe 45 through the connection method of the diverter pipe 51 and the collecting pipe 52. The collecting pipe 52 is provided with multiple groups and one end is connected to the diverter pipe 51, and the other end is connected to the return pipe 45, which is used to maintain a stable flow rate transmission when flowing into the water inlet 41 or discharging along the water outlet 42, and prevent the pumping transmission balance between the water inlet 41, the pumping box 39 and the water outlet 42 from being drastically affected by the flow rate.

[0026] It should be noted that the diameter of the filter holes on the trapezoidal grid 20 needs to be designed accordingly with reference to the type of sewage, which will not be further described here, nor will it be limited thereto.

[0027] As a preferred embodiment of the present invention, the control valve 48 generally adopts a check valve, a regulating valve or the like to prevent the backflow of sewage or to accurately adjust the flow or pressure; The ball screw 36 and ball nut 37 are driven by a screw and nut. A ball circulation device (end cover type, tube type or internal circulation structure) is provided inside the ball nut 37, so that the balls can return through the circulation channel when the ball nut 37 reaches the stroke limit, forcing the ball nut 37 to move in the opposite direction. A linear guide rail or guide rod (not shown in the figure) is provided on one side of the ball nut 37 for rigid connection to ensure that the movement direction is strictly linear and avoid circumferential deflection caused by the rotation of the screw. Mechanical blocks are provided at both ends of the ball screw 36 to push the ball reversing mechanism in the ball nut 37 through physical collision. The above structure and operating principle belong to conventional technology and are only briefly described here. For details, please refer to relevant technologies.

[0028] It should be noted that, since the sewage needs to be refluxed and filtered, the present device is suitable for use in some small-flow sewage treatment, that is, a form of sewage treatment that can be transferred after a short stay in the sewage pretreatment module 60, the sewage biological treatment module 70 or the sewage post-treatment module 80. Secondly, for some impurities filtered and intercepted by the trapezoidal grid mesh 20, it is necessary to manually clean them regularly to prevent affecting the accurate filtration of the other aperture trapezoidal grid meshes 20; For the trapezoidal grid net 20 in the sewage biological treatment module 70 and the sewage post-treatment module 80, they respectively adopt membrane bioreactor (ultrafiltration / microfiltration membrane), sand filter / activated carbon filter, etc. Their design method and operating principle are consistent with the trapezoidal grid net 20 in the sewage pretreatment module 60, and they will not be repeated here.

[0029] Finally, it should be understood that in the present application, the rotating, sliding, meshing, belt-driven and other moving parts are well lubricated and not prone to slipping or wear, and their exteriors are all provided with corresponding protective shells. However, in the drawings of the present application, in order to clearly indicate the connection status of the moving parts, they are not shown. It can also be understood that each component in the present application is made of metal or plastic material with adaptable strength in the field to which it belongs to ensure that its structural rigidity meets actual needs. It will not be further described here, nor will it be limited.

[0030] The working principle of the present invention is: in the idle space of the device, all the driving parts mentioned above, which refer to the power elements, electrical components and the adapted power supply, are connected through wires, and the electrical connections between the electrical components are completed in sequence. The detailed connection means are well known in the art. The following mainly introduces the working principle and process, and does not explain the electrical control. Sewage flow: Sewage enters the pretreatment tank 10 from the water inlet 12 and is directed to the filter channel 16 through the guide plate 14; Filter switching: The waterproof servo motor 23 drives the swing lever I 24, the swing lever II 25, the swing lever III 26, and the swing lever IV 27, which drives the lever 50 to move the adjustable filter grille 19 along the rotating slide, switching the target trapezoidal grille 20 to the filter channel 16 for filtering; Backflow control: The same motor 23 drives the gear shaft 30 through the transmission belt 28, which increases the speed through the active spur gear 31 and the driven spur gear 32, and then changes the direction of motion through the bevel gear I 34 and bevel gear II 35, driving the ball screw 36 to rotate at high speed; The ball nut 37 moves up and down along the ball screw 36, and drives the piston plate 40 to reciprocate through the L-shaped connecting rod 38; When the piston plate 40 rises, the elastic water inlet seal plate 43 opens to suck in sewage; when it descends, the elastic water outlet seal plate 44 opens to press out sewage, forming a pump suction back to the pretreatment tank 10; Diversion decision: After filtration, the sewage is directed to the drain hole 18 through the return plate 15, and is selected by the control valve 48 to enter the return system for secondary filtration or to be discharged to the next module through the rear discharge pipe 47.

[0031] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A portable modular sewage treatment device, characterized in that: It comprises a sewage pre-treatment module (60), a sewage biological treatment module (70), and a sewage post-treatment module (80) which are connected in a step-like manner, and each module is provided with an independent water flow control unit; The sewage pretreatment module (60), the sewage biological treatment module (70), and the sewage post-treatment module (80) all include a pretreatment tank (10) and a return flow transition tank (11); A water inlet (12) is provided at the top of the pretreatment tank (10), a drainage hole (13) is provided at the lower portion of the side wall of the reflux transition tank (11), and adjacent modules are gravity-connected to the water inlet (12) via the drainage hole (13); An adjustable filter screen bin (17) is provided at the connection between the pretreatment tank (10) and the return transition tank (11), wherein a filter channel (16) is provided in the bin and an adjustable filter screen (19) is rotatably provided; The adjustable filter grid (19) is a quasi-square structure with a rotating shaft (22) at the center, and four groups of trapezoidal grid nets (20) with successively varying apertures are evenly distributed circumferentially, and a toggle chute (21) is provided between adjacent trapezoidal grid nets (20), and the bottom wall of the trapezoidal grid net (20) is inwardly arc-shaped to form a rotating slideway; The adjustable filter grid bin (17) is provided with a swing assembly driven by a waterproof servo motor (23), and the swing assembly is moved along a rotating slideway by a lever (50) to switch the trapezoidal grid net (20) to the filter channel (16); The pretreatment tank (10) is connected to the bottom of the reflux transition tank (11) through a reflux system, which includes a U-shaped reflux pipe (45), a pump suction box (39) and a lifting assembly; The pump suction box (39) is provided with a piston channel, a piston plate (40), a water inlet (41) with an elastic water inlet sealing plate (43), and a water outlet (42) with an elastic water outlet sealing plate (44); The lifting assembly includes a ball screw (36), a ball nut (37), an L-shaped connecting rod (38) and a gear transmission mechanism, wherein the gear transmission mechanism is composed of an active spur gear plate (31), a driven spur gear plate (32), a bevel gear I (34), and a bevel gear II (35), and is linked to a waterproof servo motor (23) through a transmission belt (28).

2. A portable modular sewage treatment device according to claim 1, characterized in that: The swing assembly comprises: A swing rod I (24) connected to the output end of the waterproof servo motor (23); The swing rod I (24) is rotatably connected to one end of the V-shaped swing rod III (26) via the swing rod IV (27); The other end of the swing rod III (26) is connected to the swing rod II (25) via the swing rod IV (27); The swing rod II (25) is fixed to a fixed seat on the inner bottom wall of the adjustable filter grid bin (17); The shifting rod (50) is arranged at the upper end of the swinging rod III (26).

3. A portable modular sewage treatment device according to claim 1, characterized in that: In the gear transmission mechanism: The active spur gear disc (31) is connected to the gear shaft (30), and the gear shaft (30) is connected to the output shaft of the waterproof servo motor (23) through a pulley (29) and a transmission belt (28); The driven spur gear (32) engages with the driving spur gear (31) and is connected to the bevel gear I (34); The bevel gear I (34) engages with the bevel gear II (35), and the bevel gear II (35) is connected to the ball screw (36).

4. A portable modular sewage treatment device according to claim 1, characterized in that: A return plate (15) is provided in the return transition pool (11), and a drain hole (18) is provided on the return transition pool (11) at the bottom of the return plate (15). The drain hole (18) is connected to a water collecting pipe (46). The water collecting pipe (46) is connected to a return pipe (45) and a rear discharge pipe (47) of the return system, and a control valve (48) is provided on the pipe.

5. A portable modular sewage treatment device according to claim 1, characterized in that: The inlet and outlet ends of the filter channel (16) are both provided with anti-leakage retaining rings (49), and the inner side of the anti-leakage retaining ring (49) is in elastic sealing contact with the side of the trapezoidal grid (20).

6. A portable modular sewage treatment device according to claim 1, characterized in that: A guide plate (14) inclined toward the filtration channel (16) is provided in the pretreatment tank (10).

7. A portable modular sewage treatment device according to claim 1, characterized in that: The water inlet (41) and the water outlet (42) of the pump suction box (39) are respectively connected to the return pipe (45) in multiple ways via the diverter pipe (51) and the collecting pipe (52).

8. The portable modular sewage treatment device according to claim 1, characterized in that: The number of teeth or the radius of the active spur gear disc (31) is greater than that of the driven spur gear disc (32).

9. The portable modular sewage treatment device according to claim 1, characterized in that: The control valve (48) is a check valve or a regulating valve.

10. The portable modular sewage treatment device according to claim 1, characterized in that: The filter hole diameter of the trapezoidal grid (20) is set according to the type of sewage.

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