Module assembly type rural sewage treatment device

Abstract

The invention is suitable for the technical field of sewage treatment, and provides a module assembly type rural sewage treatment device which comprises a pretreatment unit, a stirring unit, a biological treatment unit, an advanced treatment unit and a disinfection unit which are sequentially connected through a water conveying pipeline, and is provided with a water inlet pipe and a water outlet pipe. The pretreatment unit adopts a grating assembly to intercept floating objects in sewage; the stirring unit prevents suspended matters from precipitating. The biological treatment unit is composed of an anaerobic assembly, an anoxic assembly and an aerobic assembly, and the anaerobic assembly, the anoxic assembly and the aerobic assembly achieve the effects of macromolecular organic matter decomposition, denitrification nitrogen removal and further organic matter degradation and nitrification respectively. The advanced treatment unit is used for removing suspended matters, colloids and organic impurities by utilizing a multi-stage filtering technology. The disinfection unit is combined with chlorine dioxide and an ultraviolet disinfection method to kill pathogenic microorganisms in the sewage, so that the effluent quality is ensured to meet the discharge standard. By means of the modular design, the efficient sewage treatment effect and the flexible environmental adaptability are achieved, and the requirement for sewage treatment in rural areas is met.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and particularly relates to a modular prefabricated rural sewage treatment device. Background Art

[0002] With the development of rural economy and the improvement of residents' living standards, the sewage discharge in rural areas is increasing day by day, posing a serious threat to the environment.

[0003] Traditional sewage treatment facilities often have difficulty adapting to the characteristics of being scattered, having complex terrains, and limited economic conditions in rural areas.

[0004] These traditional systems usually require a large floor area, have high construction costs, and are complex in operation and maintenance. For rural areas lacking professional technical personnel, both implementation and maintenance face great challenges.

[0005] In addition, traditional sewage treatment facilities also have the limitations of a single layout of treatment structures, being unable to efficiently carry out maintenance and adjustment, having low pollutant removal efficiency, and poor adaptability.

[0006] Therefore, in view of the above current situation, there is an urgent need to develop a modular prefabricated rural sewage treatment device to overcome the deficiencies in current practical applications. Summary of the Invention

[0007] The purpose of the present invention is to provide a modular prefabricated rural sewage treatment device, aiming to solve the problems mentioned in the above background art.

[0008] The present invention is implemented as follows. A modular prefabricated rural sewage treatment device includes a pretreatment unit, a stirring unit, a biological treatment unit, a deep treatment unit, and a disinfection unit that are detachably connected in sequence through a water delivery pipeline; wherein, a water inlet pipe and a drain pipe are respectively connected to the pretreatment unit and the disinfection unit;

[0009] The pretreatment unit includes a grid assembly for intercepting floating substances in the sewage;

[0010] The stirring unit is used to prevent the suspension in the sewage from settling, so that the sewage entering the biological treatment unit remains in a relatively stable state;

[0011] The biological treatment unit includes an anaerobic assembly, an anoxic assembly, and an aerobic assembly that are connected in sequence. The anaerobic assembly is used to decompose macromolecular organic substances in the sewage into small molecular organic substances under the action of anaerobic microorganisms. The anoxic assembly is used for denitrification and nitrogen removal of the sewage. The aerobic assembly is used to further decompose the organic substances in the sewage into carbon dioxide and water, and at the same time achieve nitrification;

[0012] The deep treatment unit is used to further remove suspended matter, colloids, and organic impurities in the sewage through multi-stage filtration;

[0013] The disinfection unit uses a combination of chlorine dioxide disinfection and ultraviolet disinfection to disinfect the sewage after being treated by the deep treatment unit, thereby killing pathogenic microorganisms in the sewage.

[0014] A further technical solution is that the pretreatment unit also includes a pretreatment box, the bottom of which is fixed with a support leg, and the grille assembly is provided with two groups of coarse and fine on the inner side of the pretreatment box, the grille assembly includes an outer frame fixedly connected to the inner wall of the pretreatment box and a grille fixed to the inner side of the outer frame for cooperation, a lifting plate is also provided above the pretreatment box, cleaning push-pull cylinders are fixed at both ends of the lifting plate, the cylinder body of the cleaning push-pull cylinder is fixedly connected to the side wall of the pretreatment box, and scrapers with a hollow structure are also slidably provided on both sides of the grille, and a water spray hole is opened on the side of the scraper facing the grille, and a lifting pipe is connected and fixed on the upper side of the scraper, the lifting pipe slides out from the top of the pretreatment box and its upper end is fixedly connected to the lifting plate, and the lifting pipe is also connected to the cavity opened on the inner side of the lifting plate, and a clean water tank is fixed on the side wall of the pretreatment box, and a water pump four is installed at the bottom of the clean water tank, and the outlet of the water pump four is connected to the cavity of the lifting plate through a water supply pipe.

[0015] A further technical solution is that the stirring unit includes a stirring box with a cylindrical barrel structure, a stirring shaft is rotatably installed in the middle of the inner side of the stirring box, a motor is fixed on the top of the stirring box and is transmission-connected to the stirring shaft, a plurality of stirring rods are fixed on the stirring shaft, a plurality of stirring rods are evenly distributed in a circumferential direction on each layer, and the stirring rods of two adjacent layers are evenly staggered.

[0016] According to a further technical solution, the biological treatment unit further comprises a biological treatment box, and the anaerobic component, the anoxic component and the aerobic component are sequentially arranged from top to bottom inside the biological treatment box.

[0017] A further technical solution is that the anaerobic component includes an anaerobic chamber arranged at the upper inner side of the biological treatment box, the inner side of the anaerobic chamber is filled with anaerobic biological filler, a water pipe is connected to the middle of the top of the anaerobic chamber, a water outlet pipe is connected to the middle of the bottom of the anaerobic chamber, a solenoid valve is installed on the water outlet pipe, and side support ridges for supporting the anaerobic chamber are also provided on the inner walls on both sides of the biological treatment box.

[0018] Further technical solution: The anoxic component includes an anoxic chamber supported and fixed in the middle of the inner side of the biological treatment tank by a support block. The bottom of the anoxic chamber is a mesh structure. The inner side of the anoxic chamber is filled with suspended packing. A second stirring shaft is rotatably installed in the middle of the inner side of the anoxic chamber. A second motor drivingly connected to the second stirring shaft is fixed at the bottom of the anoxic chamber. The upper end of the second stirring shaft is rotatably connected to the lower end of the water outlet pipe. Two layers of second stirring rods are also fixedly installed on the second stirring shaft. A plurality of the second stirring rods are circumferentially and evenly distributed in each layer. A plurality of sewage distribution pipes are circumferentially distributed and fixed on the second stirring shaft between the two layers of the second stirring rods. The sewage distribution pipes are also communicated with the water outlet pipe through the inner cavity of the second stirring shaft. The plurality of sewage distribution pipes and the second stirring rods on the upper and lower sides are evenly and staggeredly arranged.

[0019] Further technical solution: The aerobic component includes a first mesh support plate fixed to the lower part of the inner side of the biological treatment tank. A biological membrane packing is arranged on the upper side of the first mesh support plate. A flow equalizing mesh plate is also fixed between the biological membrane packing and the second motor. A plurality of perforated aeration pipes are fixed at the bottom of the first mesh support plate. One end of the aeration pipe is connected to an air distribution plate fixed on the outer wall of the biological treatment tank. An aeration device connected to the air distribution plate is also fixed on the outer wall of the biological treatment tank. A circulation pipe is also installed on the outer wall of the biological treatment tank. A circulation pump is installed on the circulation pipe. One end of the circulation pipe is communicated with the bottom of the upper side space of the first mesh support plate. The other end of the circulation pipe is communicated with the upper side space of the flow equalizing mesh plate.

[0020] Further technical solution: The advanced treatment unit includes a top plate, a bottom plate, and a plurality of columns circumferentially distributed and fixed on the outer side between the top plate and the bottom plate. A plurality of advanced treatment boxes are longitudinally distributed between the top plate and the bottom plate. A second mesh support plate is fixed at the bottom of the advanced treatment box. A collar is fixed on the outer side of the advanced treatment box. The collar fixed on the outer side of the lowermost advanced treatment box is fixedly connected to the column. The collars fixed on the outer sides of the remaining advanced treatment boxes are slidably connected to the column. A spring is also sleeved on the column between two adjacent collars. A bottom sealing cover is fixed at the bottom of the lowermost advanced treatment box. A top sealing cover is arranged on the upper side of the uppermost advanced treatment box. A plurality of pressing and pushing cylinders are circumferentially distributed and fixed on the top of the top sealing cover. The upper ends of the pressing and pushing cylinders are fixedly connected to the top plate. The materials filled in the advanced treatment boxes from top to bottom are large particle quartz sand, fine sand, anthracite, and activated carbon in sequence.

[0021] Further technical solution: The disinfection unit includes a disinfection tank. A plurality of inner partitions are longitudinally and evenly distributed and fixed on the inner side of the disinfection tank. One end of each inner partition is provided with a water passing hole, and the water passing holes formed on adjacent two inner partitions are staggeredly distributed. Ultraviolet disinfection lamps are installed on the inner top of the disinfection tank and on the lower side of the inner partitions. An inverted U-shaped disinfectant branch pipe is also fixed on the disinfection tank. The two side branches of the disinfectant branch pipe are arranged coaxially with the water passing holes. The two side branches of the disinfectant branch pipe are also fixedly connected to the inner partitions and correspondingly extend to the lower side of the lowermost water passing hole. Disinfectant discharge holes are formed on the disinfectant branch pipe corresponding to the water passing holes. A disinfectant tank is fixed on the outer side of the disinfection tank, and the disinfectant tank is connected to the disinfectant branch pipe through a disinfectant main pipe.

[0022] Further technical solution: The water delivery pipeline includes a fifth water delivery pipe, a first water delivery pipe, a second water delivery pipe, a flexible pipe, a third water delivery pipe and a fourth water delivery pipe. One end of the fifth water delivery pipe is detachably connected to the pretreatment tank and corresponds to the lower part of the grille. The other end of the fifth water delivery pipe is detachably connected to the upper part of the mixing tank. A water pump three is installed on the first water delivery pipe. One end of the first water delivery pipe is detachably connected to the lower part of the mixing tank. The other end of the first water delivery pipe extends into the biological treatment tank and is detachably connected to the water guide pipe. A water pump two is installed on the second water delivery pipe. One end of the second water delivery pipe is detachably connected to the biological treatment tank and communicates with the bottom of the space below the first mesh support plate. The other end of the second water delivery pipe is connected to the third water delivery pipe through a flexible pipe. The end of the third water delivery pipe far from the flexible pipe is detachably installed in the middle of the top sealing cover. A water pump one is installed on the fourth water delivery pipe. One end of the fourth water delivery pipe is detachably connected to the middle of the bottom sealing cover. The other end of the fourth water delivery pipe is detachably connected to the disinfection tank and communicates with the space above the uppermost inner partition. The water inlet pipe is connected to the upper inner part of the pretreatment tank, and the water inlet pipe and the fifth water delivery pipe are respectively located at both ends of the pretreatment tank. The drain pipe communicates with the bottom of the space below the lowermost inner partition, and the drain pipe and the fourth water delivery pipe are respectively located on both sides of the disinfection tank.

[0023] A modular prefabricated rural sewage treatment device provided by the present invention has the following beneficial effects:

[0024] Sewage is input through the inlet pipe and discharged through the drain pipe after treatment. During this process, it passes through a pretreatment unit, a stirring unit, a biological treatment unit, an advanced treatment unit, and a disinfection unit for sewage treatment. Specifically: The pretreatment unit is a grille assembly that can intercept floating substances in the sewage. The stirring unit can prevent the suspension in the sewage from precipitating, so that the sewage entering the biological treatment unit remains in a relatively stable state. The anaerobic component of the biological treatment unit can decompose macromolecular organic matter in the sewage into small-molecular organic matter under the action of anaerobic microorganisms. The anoxic component can perform denitrification and nitrogen removal on the sewage. The aerobic component can further decompose the organic matter in the sewage into carbon dioxide and water, and at the same time achieve nitrification. The advanced treatment unit can further remove suspended substances, colloids, and organic impurities in the sewage through a multi-stage filtration method. Finally, the disinfection unit uses a combination of chlorine dioxide disinfection and ultraviolet disinfection to disinfect the sewage treated by the advanced treatment unit and kill pathogenic microorganisms in the sewage.

[0025] In summary, the modular assembled rural sewage treatment device achieves efficient sewage treatment effects and flexible environmental adaptability through modular design. At the same time, it reduces costs and simplifies maintenance work, meeting the sewage treatment needs of rural areas. Brief Description of the Drawings

[0026] Figure 1 It is a schematic diagram of the overall structure of the modular assembled rural sewage treatment device provided by an embodiment of the present invention;

[0027] Figure 2 It is Figure 1 a schematic diagram of the rear view angle structure;

[0028] Figure 3 It is an axonometric view of the pretreatment unit in the modular assembled rural sewage treatment device provided by an embodiment of the present invention;

[0029] Figure 4 It is Figure 3 an enlarged schematic diagram of part A in

[0030] Figure 5 It is an axonometric view of the stirring unit in the modular assembled rural sewage treatment device provided by an embodiment of the present invention;

[0031] Figure 6 It is an axonometric view of the biological treatment unit in the modular assembled rural sewage treatment device provided by an embodiment of the present invention;

[0032] Figure 7 It is an axonometric view of the advanced treatment unit in the modular assembled rural sewage treatment device provided by an embodiment of the present invention;

[0033] Figure 8Isometric view of the disinfection unit in the modular prefabricated rural sewage treatment device provided by the embodiment of the present invention;

[0034] Figure 9 Is Figure 8 Schematic enlarged structure diagram of part B in

[0035] In the figure: 1 - cleaning push - pull cylinder, 2 - pretreatment tank, 3 - lifting pipe, 4 - lifting plate, 5 - water supply pipe, 6 - motor 1, 7 - water delivery pipe 1, 8 - biological treatment tank, 9 - water delivery pipe 2, 10 - flexible pipe, 11 - top plate, 12 - water delivery pipe 3, 13 - pressing push - pull cylinder, 14 - water delivery pipe 4, 15 - disinfectant branch pipe, 16 - disinfectant main pipe, 17 - disinfection tank, 18 - disinfectant tank, 19 - drain pipe, 20 - water pump 1, 21 - bottom plate, 22 - column, 23 - bottom seal cover, 24 - water pump 2, 25 - air distribution plate, 26 - aeration device, 27 - water pump 3, 28 - stirring tank, 29 - water delivery pipe 5, 30 - leg, 31 - maintenance port 1, 32 - water purification tank, 33 - collar, 34 - advanced treatment box, 35 - top seal cover, 36 - maintenance port 2, 37 - circulation pipe, 38 - circulation pump, 39 - water inlet pipe, 40 - cavity, 41 - grille, 42 - outer frame, 43 - scraper, 44 - water spray hole, 45 - stirring shaft 1, 46 - stirring rod 1, 47 - water guide pipe, 48 - anaerobic chamber, 49 - anaerobic biological filler, 50 - side rib, 51 - support block, 52 - solenoid valve, 53 - anoxic chamber, 54 - stirring rod 2, 55 - stirring shaft 2, 56 - sewage distribution pipe, 57 - motor 2, 58 - flow - equalizing mesh plate, 59 - mesh support plate 1, 60 - aeration pipe, 61 - biological membrane filler, 62 - maintenance port 3, 63 - mesh support plate 2, 64 - inner partition board, 65 - ultraviolet disinfection lamp, 66 - water passing hole, 67 - disinfectant discharge hole. Detailed implementation manners

[0036] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the following further details the present invention in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] The following details the specific implementation of the present invention in conjunction with specific embodiments.

[0038] As Figure 1-2 shown, a modular prefabricated rural sewage treatment device provided by an embodiment of the present invention includes a pretreatment unit, a stirring unit, a biological treatment unit, an advanced treatment unit and a disinfection unit that are detachably connected in sequence through a water delivery pipeline; among them, a water inlet pipe 39 and a drain pipe 19 are respectively connected to the pretreatment unit and the disinfection unit.

[0039] The pretreatment unit includes a grid assembly for intercepting floating substances in the sewage.

[0040] The stirring unit is used to prevent the suspension in the sewage from settling, so that the sewage entering the biological treatment unit remains in a relatively stable state.

[0041] The biological treatment unit includes an anaerobic component, an anoxic component, and an aerobic component connected in sequence. The anaerobic component is used to decompose macromolecular organic matter in the sewage into small-molecular organic matter under the action of anaerobic microorganisms. The anoxic component is used for denitrification and nitrogen removal of the sewage. The aerobic component is used to further decompose the organic matter in the sewage into carbon dioxide and water, and at the same time achieve nitrification.

[0042] The advanced treatment unit is used to further remove suspended substances, colloids, and organic impurities in the sewage through a multi-stage filtration method.

[0043] The disinfection unit uses a combination of chlorine dioxide disinfection and ultraviolet disinfection to disinfect the sewage treated by the advanced treatment unit and kill pathogenic microorganisms in the sewage.

[0044] In the embodiment of the present invention, the sewage is input through the water inlet pipe 39 and discharged through the drain pipe 19 after treatment. During this period, the sewage is treated by the pretreatment unit, the stirring unit, the biological treatment unit, the advanced treatment unit, and the disinfection unit in sequence. Specifically: the pretreatment unit can intercept the floating substances in the sewage with a grid assembly, the stirring unit can prevent the suspension in the sewage from settling, so that the sewage entering the biological treatment unit remains in a relatively stable state, the anaerobic component of the biological treatment unit can decompose the macromolecular organic matter in the sewage into small-molecular organic matter under the action of anaerobic microorganisms, the anoxic component can perform denitrification and nitrogen removal on the sewage, the aerobic component can further decompose the organic matter in the sewage into carbon dioxide and water, and at the same time achieve nitrification, the advanced treatment unit can further remove suspended substances, colloids, and organic impurities in the sewage through a multi-stage filtration method, and finally the disinfection unit uses a combination of chlorine dioxide disinfection and ultraviolet disinfection to disinfect the sewage treated by the advanced treatment unit and kill pathogenic microorganisms in the sewage.

[0045] In summary, the modular assembled rural sewage treatment device achieves efficient sewage treatment effect and flexible environmental adaptability through modular design, while reducing costs and simplifying maintenance work, meeting the sewage treatment needs of rural areas.

[0046] Such as Figure 1-4As shown, as a preferred embodiment of the present invention, the pretreatment unit also includes a pretreatment box 2, the bottom of the pretreatment box 2 is fixed with a support leg 30, the grille assembly is provided with two groups of coarse and fine grilles on the inner side of the pretreatment box 2, the grille assembly includes an outer frame 42 fixedly connected to the inner wall of the pretreatment box 2 and a grille 41 fixed to the inner side of the outer frame 42, a lifting plate 4 is also provided above the pretreatment box 2, and cleaning push-pull cylinders 1 are fixed at both ends of the lifting plate 4, the cylinder body of the cleaning push-pull cylinder 1 is fixedly connected to the side wall of the pretreatment box 2, and the grille Scrapers 43 with hollow structures are also slidably provided on both sides of 41, and a water spray hole 44 is opened on the side of the scraper 43 facing the grille 41. A lifting pipe 3 is connected and fixed to the upper side of the scraper 43. The lifting pipe 3 slides out from the top of the pretreatment box 2 and its upper end is fixedly connected to the lifting plate 4. The lifting pipe 3 is also connected to the cavity 40 opened on the inner side of the lifting plate 4. A clean water tank 32 is fixed on the side wall of the pretreatment box 2, and a water pump four (not shown) is installed at the bottom of the clean water tank 32. The outlet of the water pump four is connected to the cavity 40 of the lifting plate 4 through the water supply pipe 5.

[0047] The side bottom of the pre-treatment box 2 is also provided with a plurality of maintenance ports 31 to facilitate the cleaning and discharge of dirt deposited on the inner bottom of the pre-treatment box 2 .

[0048] For the pretreatment unit, the coarse and fine grids 41 are used to intercept large floating objects and small suspended objects in the sewage to prevent them from clogging and damaging the subsequent treatment equipment. The arrangement of the outer frame 42 is conducive to the deposition and storage of dirt. When the grid 41 needs to be cleaned, the cleaning push-pull cylinder 1 can be started to extend and retract and the water pump 4 can be started to deliver water. In this way, the scraper 43 can be used to scrape off the adhesion on the surface of the grid 41. At the same time, the water sprayed from the water spray hole 44 can clean the grid 41, which is conducive to the long-term and efficient application of the grid 41.

[0049] like Figure 1 and 5 As shown, as a preferred embodiment of the present invention, the stirring unit includes a stirring box 28 of a cylindrical barrel structure, a stirring shaft 45 is rotatably installed in the middle of the inner side of the stirring box 28, a motor 6 connected to the stirring shaft 45 is fixed on the top of the stirring box 28, and a plurality of stirring rods 46 are fixed on the stirring shaft 45. A plurality of stirring rods 46 are evenly distributed in the circumference of each layer, and the stirring rods 46 of two adjacent layers are evenly staggered.

[0050] For the stirring unit, a reagent adding port (not shown) can be provided on the top of the stirring box 28 to add auxiliary treatment reagents as needed. The stirring rod 46 is driven by the motor 6 to rotate, so that the water quality and water volume of the sewage can be adjusted, so that the sewage entering the biological treatment unit can maintain a relatively stable state, such as preventing the precipitation of suspended matter in the sewage.

[0051] likeFigure 1 , 2 As shown in Figure 6, as a preferred embodiment of the present invention, the biological treatment unit also includes a biological treatment box 8, and the anaerobic component, the anoxic component and the aerobic component are sequentially arranged from top to bottom on the inner side of the biological treatment box 8. The anaerobic component includes an anaerobic chamber 48 arranged on the upper inner side of the biological treatment box 8, and the inner side of the anaerobic chamber 48 is filled with anaerobic biological filler 49. The top middle of the anaerobic chamber 48 is connected with a water pipe 47, and the bottom middle of the anaerobic chamber 48 is connected with a water outlet pipe, and a solenoid valve 52 is installed on the water outlet pipe. The inner walls on both sides of the biological treatment box 8 are also provided with side support ribs 50 for supporting the anaerobic chamber 48. Among them, the upper part of the side wall of the biological treatment box 8 is provided with a maintenance port 36 corresponding to the anaerobic chamber 48, which is convenient for maintenance of the anaerobic chamber 48. Through the arrangement of the anaerobic component, the macromolecular organic matter in the sewage is decomposed into small molecular organic matter under the action of anaerobic microorganisms.

[0052] The anoxic assembly includes an anoxic chamber 53 supported and fixed to the middle of the inner side of the biological treatment box 8 by a support block 51. The bottom of the anoxic chamber 53 is a mesh structure. The inner side of the anoxic chamber 53 is filled with a suspended filler (not shown). A stirring shaft 2 55 is rotatably installed in the middle of the inner side of the anoxic chamber 53. A motor 2 57 connected to the stirring shaft 2 55 is fixed at the bottom of the anoxic chamber 53. The upper end of the stirring shaft 2 55 is rotatably connected to the lower end of the outlet pipe. Two layers of stirring rods 2 54 are also installed and fixed on the stirring shaft 2 55. A plurality of stirring rods 2 54 are evenly distributed circumferentially on each layer. A plurality of sewage distribution pipes 56 are circumferentially distributed and fixed on the stirring shaft 2 55 between the two layers of the stirring rods 2 54. The sewage distribution pipes 56 are also connected to the outlet pipe through the inner cavity of the stirring shaft 2 55. The plurality of sewage distribution pipes 56 are evenly staggered with the stirring rods 2 54 on the upper and lower sides to improve the stirring and mixing effect. Among them, an inlet and outlet (not shown) for replacing the suspended filler can be set on the side wall of the biological treatment box 8 as needed. By setting the anoxic component, the solenoid valve 52 is opened to transport sewage to the stirring shaft 55, and then discharged into the inner cavity of the anoxic chamber 53 through the rotating sewage distribution pipe 56. The sewage is fully in contact with the suspended filler to complete the denitrification process.

[0053] The aerobic component includes a first mesh support plate 59 fixed to the lower inner part of the biological treatment tank 8. A biological membrane filler 61 is arranged on the upper side of the first mesh support plate 59. A flow equalizing mesh plate 58 is also fixed between the biological membrane filler 61 and the second motor 57. Multiple perforated aeration pipes 60 are fixed to the bottom of the first mesh support plate 59. One end of the aeration pipe 60 is connected to a gas distribution plate 25 fixed to the outer wall of the biological treatment tank 8. An aeration device 26 connected to the gas distribution plate 25 is also fixed to the outer wall of the biological treatment tank 8. A circulation pipe 37 is also installed on the outer wall of the biological treatment tank 8. A circulation pump 38 is installed on the circulation pipe 37. One end of the circulation pipe 37 communicates with the bottom of the upper space of the first mesh support plate 59, and the other end of the circulation pipe 37 communicates with the upper space of the flow equalizing mesh plate 58. Among them, a third maintenance port 62 corresponding to the upper space of the first mesh support plate 59 is also provided on the side wall of the biological treatment tank 8, which is convenient for maintenance and replacement of the biological membrane filler 61. Note the hole setting of the flow equalizing mesh plate 58, which only needs to ensure that the biological membrane filler 61 can pass through, playing a certain role in uniform distribution. Through the setting of the aerobic component, aeration through the aeration pipe 60 provides sufficient oxygen for aerobic microorganisms. The aerobic microorganisms further decompose the organic matter in the sewage into carbon dioxide and water, and at the same time, nitrification is achieved. In addition, through the arrangement of the circulation pipe 37 and the circulation pump 38, the mixed liquid can be pumped from the bottom, then sprayed from the upper part and form a high-speed circulation flow to realize the fluidization of the filler and the full mixing of the upper and lower mixed liquids, improving the mass transfer efficiency.

[0054] Preferably, the biological membrane filler 61 is made of polyurethane or polyethylene material, with a specific surface area ≥800 m² / m³ and a porosity of 90% - 95% to enhance the microbial attachment ability; the suspended filler is a porous spherical filler with a diameter of 10 - 15 mm and a density slightly less than that of water to ensure full contact with the sewage in the fluidized state.

[0055] Such as Figure 1 、 2As shown in FIGS. 6 and 7, as a preferred embodiment of the present invention, the advanced treatment unit includes a top plate 11, a bottom plate 21, and a plurality of columns 22 circumferentially distributed and fixed on the outer side between the top plate 11 and the bottom plate 21. A plurality of advanced treatment boxes 34 are longitudinally distributed between the top plate 11 and the bottom plate 21. A second mesh support plate 63 is fixed to the bottom of the advanced treatment box 34. A collar 33 is fixed to the outer side of the advanced treatment box 34. The collar 33 fixed to the outer side of the lowermost advanced treatment box 34 is fixedly connected to the column 22, and the collars 33 fixed to the outer sides of the remaining advanced treatment boxes 34 are slidably connected to the column 22. A spring (not shown) is also sleeved on the column 22 between two adjacent collars 33. A bottom sealing cover 23 is fixed to the bottom of the lowermost advanced treatment box 34, and a top sealing cover 35 is provided on the upper side of the uppermost advanced treatment box 34. A plurality of pressing and pushing cylinders 13 are circumferentially distributed and fixed on the top of the top sealing cover 35, and the upper ends of the pressing and pushing cylinders 13 are fixedly connected to the top plate 11. The materials filled in the advanced treatment boxes 34 from top to bottom are large particle quartz sand, fine sand, anthracite, and activated carbon in sequence. The large particle quartz sand is mainly used to remove larger suspended particles and part of the colloid substances. The fine sand is used to further remove finer suspended substances and colloid. The anthracite can effectively adsorb small particle size suspended substances and part of the organic substances, and at the same time is helpful for improving the turbidity of the effluent. The activated carbon has a huge specific surface area and can efficiently adsorb organic substances, odor substances, pigments, and certain heavy metal ions, etc. in the water to ensure the purity of the water quality. Among them, a sealing ring (not shown) is also provided on the top of the advanced treatment box 34 to ensure the tightness of the abutment and avoid water leakage.

[0056] For the advanced treatment unit, through the setting of the telescopic movement of the pressing and pushing cylinders 13 in cooperation with the springs, the tight abutment and the separation after release of the advanced treatment boxes 34 can be realized, which is beneficial to the cleaning and maintenance of the advanced treatment boxes 34, that is, it is convenient to regularly replace and maintain the filtering media. By adopting the multi-layer filtering technology, the suspended substances, colloids, organic substances and other impurities in the sewage are further removed, and the effluent water quality is improved.

[0057] As Figure 1-2, as shown in FIGS. 8-9, as a preferred embodiment of the present invention, the disinfection unit includes a disinfection tank 17. A plurality of inner partitions 64 are longitudinally and uniformly distributed and fixed inside the disinfection tank 17. One end of the inner partition 64 is provided with a water passing hole 66, and the water passing holes 66 formed on two adjacent inner partitions 64 are staggeredly distributed. Ultraviolet disinfection lamps 65 are installed on the inner top of the disinfection tank 17 and on the lower side of the inner partition 64. An inverted U-shaped disinfectant branch pipe 15 is also fixed on the disinfection tank 17. The two side branches of the disinfectant branch pipe 15 are coaxial with the water passing holes 66. The two side branches of the disinfectant branch pipe 15 are also fixedly connected to the inner partition 64 and correspondingly extend to the lower side of the lowermost water passing hole 66. Disinfectant discharge holes 67 are formed on the disinfectant branch pipe 15 corresponding to the water passing holes 66. A disinfectant tank 18 is fixed on the outer side of the disinfection tank 17, and the disinfectant tank 18 is connected to the disinfectant branch pipe 15 through a disinfectant main pipe 16.

[0058] Through the setting of the disinfection unit, the disinfection treatment of the sewage after advanced treatment is carried out by using chlorine dioxide disinfection and ultraviolet disinfection methods to kill the pathogenic microorganisms in the sewage and ensure that the effluent meets the specified discharge standards. The combined setting of the inner partition 64 and the ultraviolet disinfection lamp 65 enables the sewage to stay sufficiently, improves the disinfection quality, and the disinfectant discharge hole 67 is arranged corresponding to the water passing hole 66, which can carry out chlorine dioxide disinfection reliably and sufficiently.

[0059] As Figure 1-9As shown, as a preferred embodiment of the present invention, the water delivery pipeline includes a fifth water delivery pipe 29, a first water delivery pipe 7, a second water delivery pipe 9, a flexible pipe 10, a third water delivery pipe 12, and a fourth water delivery pipe 14. One end of the fifth water delivery pipe 29 is detachably connected to the pretreatment tank 2 and corresponds to the lower part of the grille 41. The other end of the fifth water delivery pipe 29 is detachably connected to the upper part of the mixing tank 28. A third water pump 27 is installed on the first water delivery pipe 7. One end of the first water delivery pipe 7 is detachably connected to the lower part of the mixing tank 28, and the other end of the first water delivery pipe 7 extends into the biological treatment tank 8 and is detachably connected to the water guide pipe 47. A second water pump 24 is installed on the second water delivery pipe 9. One end of the second water delivery pipe 9 is detachably connected to the biological treatment tank 8 and communicates with the bottom of the lower space of the first mesh support plate 59. The other end of the second water delivery pipe 9 is connected to the third water delivery pipe 12 through the flexible pipe 10. The end of the third water delivery pipe 12 away from the flexible pipe 10 is detachably installed in the middle of the top sealing cover 35. A first water pump 20 is installed on the fourth water delivery pipe 14. One end of the fourth water delivery pipe 14 is detachably connected to the middle of the bottom sealing cover 23, and the other end of the fourth water delivery pipe 14 is detachably connected to the disinfection tank 17 and communicates with the upper space of the uppermost inner partition plate 64. In addition, the water inlet pipe 39 is connected to the upper inner part of the pretreatment tank 2, and the water inlet pipe 39 and the fifth water delivery pipe 29 are respectively located at both ends of the pretreatment tank 2. The coarse and fine grilles 41 are correspondingly arranged and will not be elaborated here. The drain pipe 19 communicates with the bottom of the lower space of the lowermost inner partition plate 64, and the drain pipe 19 and the fourth water delivery pipe 14 are respectively located on both sides of the disinfection tank 17. The water passing holes 66 are correspondingly opened to maximize the water body residence time.

[0060] Each treatment unit adopts a prefabricated and assembled structure. The production and assembly of the modules are completed in the factory, and then transported to the construction site for rapid installation. The connection between units can adopt standardized connection methods such as bolt connection and clamp connection to ensure firm connection and reliable sealing. At the same time, the components inside each unit are also modularly designed for easy maintenance and replacement. For example: each treatment unit adopts a standardized flange interface, allowing for quick disassembly and reorganization; a buffer space is reserved between the pretreatment unit and the mixing unit to adapt to the height difference changes of different terrains.

[0061] After testing, the combination of the coarse and fine grilles 41 can intercept floating objects with a diameter ≥ 2 mm, and the interception efficiency reaches 95%; after the scraper 43 sprays water for cleaning, the blockage rate of the grille 41 is reduced by 80%.

[0062] Under the condition that the total nitrogen concentration of the influent water is 50 mg / L, the denitrification efficiency of the anoxic component is 85%, and the nitrification efficiency of the aerobic component is 90%; after combined treatment, the total nitrogen concentration of the effluent water ≤ 8 mg / L, meeting the water pollutant discharge standards for rural domestic sewage treatment facilities.

[0063] When the dosage of chlorine dioxide in the disinfection unit is 2 mg / L and the ultraviolet dose is 40 mJ / cm², the inactivation rate of Escherichia coli is ≥99.99%, and the number of fecal coliforms in the effluent is ≤100 CFU / L.

[0064] In the above embodiments of the present invention, a modular prefabricated rural sewage treatment device is provided, and the working principle is as follows:

[0065] The sewage first enters the pretreatment tank 2 through the water inlet pipe 39. Here, two groups of coarse and fine grilles 41 intercept large floating objects and small suspended solids in the sewage to prevent subsequent equipment from being blocked. A scraper 43 and a cleaning push-pull cylinder 1 are provided in the pretreatment tank to clean and maintain the grille.

[0066] The preliminarily filtered sewage flows into the mixing tank 28 through the water delivery pipe five 29. In the mixing unit, the motor one 6 drives the mixing shaft one 45 and the mixing rods one 46 thereon to rotate to keep the sewage uniform, prevent the suspended solids from settling, and ensure relatively stable water quality before entering the biological treatment unit.

[0067] The sewage flows through the anaerobic chamber 48, the anoxic chamber 53 and the aerobic component in sequence. In the anaerobic chamber 48, anaerobic microorganisms decompose the macromolecular organic matter in the sewage into small molecular organic matter. In the anoxic chamber 53, under the action of the mixing shaft two 55 and the mixing rods two 54, the sewage is in full contact with the suspended packing to complete the denitrification and nitrogen removal process. In the aerobic component, the aeration pipe 60 supplies oxygen to aerobic microorganisms to further decompose organic matter and achieve nitrification.

[0068] The water flowing out of the biological treatment unit enters the advanced treatment unit, where multi-stage filtration technology including large particle quartz sand, fine sand, anthracite and activated carbon is used to remove finer suspended solids, colloids and organic matter to improve the effluent quality.

[0069] Finally, the treated sewage enters the disinfection tank 17 and is disinfected by chlorine dioxide and the ultraviolet disinfection lamp 65 to kill pathogenic microorganisms. The treated water is discharged through the drain pipe 19.

[0070] In summary, the present invention realizes efficient sewage treatment effect and flexible environmental adaptability through modular design, while reducing costs and simplifying maintenance work, meeting the sewage treatment needs of rural areas.

[0071] The control of each component can be achieved by using a controller disclosed in the prior art. The models and circuit connections of each component are not specifically limited and can be flexibly set in actual applications. An intelligent control system can also be equipped as needed, which can monitor the water quality and quantity of sewage and various parameters during the treatment process (such as dissolved oxygen, pH value, oxidation-reduction potential, etc.) in real time, and automatically adjust the operating state of the equipment according to the monitoring data to achieve automatic control of the sewage treatment process, which will not be limited and elaborated here. For example: The solenoid valve 52 and the circulation pump 38 are linked by a controller. When the dissolved oxygen concentration in the anoxic chamber 53 is lower than 0.5 mg / L, the solenoid valve 52 opens and at the same time the circulation pump 38 starts to ensure the efficient progress of the denitrification reaction; the aeration device 26 dynamically adjusts the aeration volume according to the feedback of the dissolved oxygen sensor (not shown) in the aerobic component to maintain the dissolved oxygen concentration at 2-4 mg / L.

[0072] The circuits, electronic components and modules involved are all prior art and can be fully realized by those skilled in the art. There is no need to elaborate. The content protected by the present invention does not involve improvements to software and methods either.

[0073] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0074] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. A modular prefabricated rural sewage treatment device, characterized in that, It comprises a pretreatment unit, a stirring unit, a biological treatment unit, a deep treatment unit and a disinfection unit which are detachably connected in sequence via a water delivery pipeline; wherein the pretreatment unit and the disinfection unit are also respectively connected to a water inlet pipe (39) and a drainage pipe (19); The pre-treatment unit includes a grid assembly for intercepting floating objects in sewage; The stirring unit is used to prevent the suspended matter in the sewage from settling, so that the sewage entering the biological treatment unit remains in a relatively stable state; The biological treatment unit comprises an anaerobic component, an anoxic component and an aerobic component connected in sequence, wherein the anaerobic component is used to decompose macromolecular organic matter in the sewage into small molecular organic matter under the action of anaerobic microorganisms, the anoxic component is used to denitrify the sewage, and the aerobic component is used to further decompose the organic matter in the sewage into carbon dioxide and water, while achieving nitrification; The deep treatment unit is used to further remove suspended matter, colloids, and organic impurities in the sewage through multi-stage filtration; The disinfection unit uses a combination of chlorine dioxide disinfection and ultraviolet disinfection to disinfect the sewage after being treated by the deep treatment unit, thereby killing pathogenic microorganisms in the sewage.

2. The modular prefabricated rural sewage treatment device according to claim 1, wherein The pretreatment unit further comprises a pretreatment box (2), a support leg (30) being fixed to the bottom of the pretreatment box (2), a grille assembly having two groups of coarse and fine grilles being provided on the inner side of the pretreatment box (2), the grille assembly comprising an outer frame (42) fixedly connected to the inner wall of the pretreatment box (2) and a grille (41) mounted and fixed to the inner side of the outer frame (42); A lifting plate (4) is also provided above the pretreatment box (2), and cleaning push-pull cylinders (1) are fixed at both ends of the lifting plate (4), and the cylinder body of the cleaning push-pull cylinder (1) is fixedly connected to the side wall of the pretreatment box (2); Scrapers (43) with hollow structures are also slidably provided on both sides of the grille (41); a water spray hole (44) is provided on the side of the scraper (43) facing the grille (41); a lifting pipe (3) is connected and fixed to the upper side of the scraper (43); the lifting pipe (3) slides out from the top of the pretreatment box (2) and its upper end is fixedly connected to the lifting plate (4); the lifting pipe (3) is also connected to a cavity (40) provided on the inner side of the lifting plate (4); A clean water tank (32) is fixed on the side wall of the pretreatment box (2), a water pump (4) is installed at the bottom of the clean water tank (32), and the outlet of the water pump (4) is connected to the cavity (40) of the lifting plate (4) through a water supply pipe (5).

3. The modular assembled rural sewage treatment device according to claim 2, characterized in that, The stirring unit comprises a stirring box (28) of a cylindrical barrel structure, a stirring shaft (45) is rotatably mounted in the middle of the inner side of the stirring box (28), and a motor (6) is fixed on the top of the stirring box (28) and is transmission-connected to the stirring shaft (45); A plurality of stirring rods (46) are fixed on the stirring shaft (45), and a plurality of stirring rods (46) are evenly distributed in the circumferential direction on each layer, and the stirring rods (46) of two adjacent layers are evenly staggered.

4. The modular assembled rural sewage treatment device according to claim 3, wherein, The biological treatment unit further comprises a biological treatment box (8), wherein the anaerobic component, the anoxic component and the aerobic component are arranged in sequence from top to bottom inside the biological treatment box (8).

5. The modular prefabricated rural sewage treatment device according to claim 4, characterized in that, The anaerobic assembly comprises an anaerobic chamber (48) arranged at the upper inner part of the biological treatment box (8), the inner side of the anaerobic chamber (48) is filled with anaerobic biological filler (49), the middle of the top of the anaerobic chamber (48) is connected to a water pipe (47), the middle of the bottom of the anaerobic chamber (48) is connected to a water outlet pipe, and a solenoid valve (52) is installed on the water outlet pipe; Side support ribs (50) for supporting the anaerobic chamber (48) are also provided on the inner walls on both sides of the biological treatment box (8).

6. The modular assembled rural sewage treatment device according to claim 5, wherein, The anoxic component comprises an anoxic chamber (53) supported and fixed to the middle of the inner side of the biological treatment box (8) by a support block (51); the bottom of the anoxic chamber (53) is a mesh structure, and the inner side of the anoxic chamber (53) is filled with a suspended filler; A second stirring shaft (55) is rotatably mounted in the middle of the inner side of the anoxic chamber (53), and a second motor (57) drivingly connected to the second stirring shaft (55) is fixed at the bottom of the anoxic chamber (53); The upper end of the second stirring shaft (55) is rotatably connected to the lower end of the water outlet pipe, and two layers of second stirring rods (54) are also fixedly mounted on the second stirring shaft (55), and a plurality of second stirring rods (54) are evenly distributed in the circumference of each layer; A plurality of sewage distribution pipes (56) are fixedly distributed circumferentially on the stirring shaft (55) between the two layers of the stirring rods (54), and the sewage distribution pipes (56) are also connected to the water outlet pipe through the inner cavity of the stirring shaft (55); The plurality of sewage distribution pipes (56) and the second stirring rods (54) on the upper and lower sides are evenly and staggeredly arranged.

7. The modular prefabricated rural sewage treatment device according to claim 6, characterized in that, The aerobic component comprises a mesh support plate 1 (59) fixed to the lower inner part of the biological treatment box (8), a biofilm filler (61) is provided on the upper side of the mesh support plate 1 (59), and a flow-equalizing mesh plate (58) is also fixed between the biofilm filler (61) and the motor 2 (57); A plurality of aeration tubes (60) with holes are fixed to the bottom of the first net support plate (59), one end of the aeration tube (60) is connected to an air distribution plate (25) fixed to the outer wall of the biological treatment box (8), and an aeration device (26) connected to the air distribution plate (25) is also fixed to the outer wall of the biological treatment box (8); A circulation pipe (37) is also installed on the outer wall of the biological treatment box (8), and a circulation pump (38) is installed on the circulation pipe (37). One end of the circulation pipe (37) is connected to the bottom of the upper space of the mesh support plate (59), and the other end of the circulation pipe (37) is connected to the upper space of the flow equalizing mesh plate (58).

8. The modular prefabricated rural sewage treatment device according to claim 7, characterized in that, The deep processing unit comprises a top plate (11), a bottom plate (21), and a plurality of columns (22) distributed in a circumferential direction and fixed on the outside between the top plate (11) and the bottom plate (21); A plurality of deep processing boxes (34) are longitudinally distributed between the top plate (11) and the bottom plate (21); a second net support plate (63) is fixed to the bottom of the deep processing box (34); and a collar (33) is fixed to the outer side of the deep processing box (34); The outer fixed collar (33) of the bottommost depth processing box (34) is fixedly connected to the column (22), and the outer fixed collars (33) of the remaining depth processing boxes (34) are slidably connected to the column (22); A spring is also sleeved on the column (22) between two adjacent said collars (33). A bottom sealing cover (23) is fixed to the bottom of the lowermost depth treatment box (34), and a top sealing cover (35) is provided on the upper side of the uppermost depth treatment box (34). A plurality of pressing and pushing cylinders (13) are circumferentially distributed and fixed on the top of the top sealing cover (35), and the upper ends of the pressing and pushing cylinders (13) are fixedly connected to the top plate (11). The materials filled in the depth treatment boxes (34) from top to bottom are large particle quartz sand, fine sand, anthracite and activated carbon in sequence.

9. The modular assembled rural sewage treatment device according to claim 8, characterized in that, The disinfection unit includes a disinfection box (17). A plurality of inner partitions (64) are longitudinally and evenly distributed and fixed on the inner side of the disinfection box (17). A water passing hole (66) is opened at one end of the inner partition (64), and the water passing holes (66) opened on two adjacent said inner partitions (64) are staggered. Ultraviolet disinfection lamps (65) are installed on the inner top of the disinfection box (17) and on the lower side of the inner partition (64). An inverted U-shaped disinfectant branch pipe (15) is also fixed to the disinfection box (17). The two side branches of the disinfectant branch pipe (15) are coaxially arranged with the water passing holes (66). The two side branches of the disinfectant branch pipe (15) are also fixedly connected to the inner partition (64) and correspondingly extend to the lower side of the lowermost water passing hole (66). Disinfectant discharge holes (67) are opened on the disinfectant branch pipe (15) corresponding to the water passing holes (66). A disinfectant tank (18) is fixed to the outside of the disinfection box (17), and the disinfectant tank (18) is connected to the disinfectant branch pipe (15) through a disinfectant main pipe (16).

10. The modular prefabricated rural sewage treatment device according to claim 9, characterized in that, The water delivery pipeline includes a fifth water delivery pipe (29), a first water delivery pipe (7), a second water delivery pipe (9), a flexible pipe (10), a third water delivery pipe (12) and a fourth water delivery pipe (14). One end of the fifth water delivery pipe (29) is detachably connected to the pretreatment box (2), and the fifth water delivery pipe (29) corresponds to the lower part of the grille (41). The other end of the fifth water delivery pipe (29) is detachably connected to the upper part of the mixing box (28). A third water pump (27) is installed on the first water delivery pipe (7). One end of the first water delivery pipe (7) is detachably connected to the lower part of the mixing box (28). The other end of the first water delivery pipe (7) extends into the biological treatment box (8) and is detachably connected to the water guide pipe (47). A second water pump (24) is installed on the second water delivery pipe (9). One end of the second water delivery pipe (9) is detachably connected to the biological treatment box (8), and the second water delivery pipe (9) communicates with the bottom of the space below the first mesh supporting plate (59). The other end of the second water delivery pipe (9) is connected to the third water delivery pipe (12) through the flexible pipe (10). The end of the third water delivery pipe (12) away from the flexible pipe (10) is detachably installed in the middle of the top sealing cover (35). A first water pump (20) is installed on the fourth water delivery pipe (14). One end of the fourth water delivery pipe (14) is detachably connected to the middle of the bottom sealing cover (23). The other end of the fourth water delivery pipe (14) is detachably connected to the disinfection box (17), and the fourth water delivery pipe (14) communicates with the space above the uppermost inner partition (64). The water inlet pipe (39) is connected to the upper inner part of the pretreatment tank (2), and the water inlet pipe (39) and the fifth water delivery pipe (29) are respectively located at both ends of the pretreatment tank (2); The drain pipe (19) communicates with the bottom of the space on the lower side of the lowermost inner partition plate (64), and the drain pipe (19) and the fourth water delivery pipe (14) are respectively located on both sides of the disinfection tank (17).

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