Modular land infiltration system

Abstract

The application relates to a modular land infiltration system, which comprises an upper infiltration area and a lower infiltration area, wherein the upper infiltration area comprises a plurality of supporting layers arranged longitudinally at intervals, a plurality of module layers spliced between two adjacent supporting layers, and a plurality of upper infiltration surrounding plates spliced to the outer sides of the module layers to enclose the supporting layers and the module layers of the upper infiltration area; the lower infiltration area comprises a plurality of module layers spliced longitudinally in sequence, and a plurality of lower infiltration surrounding plates spliced to the periphery of the module layers of the lower infiltration area to enclose the module layers of the lower infiltration area; the supporting layer at the bottom of the upper infiltration area is spliced with the module layer at the top of the lower infiltration area. The module layer is used for laying filler for infiltration. The upper infiltration area and the lower infiltration area are designed by a modular structure, so that modular sewage infiltration treatment is realized, and civil construction such as concrete pouring pool is not needed, and the system can be prefabricated, transported to the site conveniently and quickly, and put into use.

Description

Technical Field

[0001] This invention relates to the field of land infiltration systems, and in particular to a modular land infiltration system. Background Technology

[0002] Soil infiltration systems have been used in my country for over 30 years. They offer advantages such as low investment, low operating costs, and simple maintenance. They can be used for both centralized and decentralized wastewater treatment in individual households. Using soil infiltration systems as a primary technology for rural domestic wastewater treatment aligns with the actual conditions in rural areas of my country, demonstrating excellent applicability to general rural wastewater treatment and effectively addressing environmental problems caused by rural water pollution.

[0003] The invention patent with announcement number CN202379844U discloses a high-efficiency nitrogen and phosphorus removal underground infiltration wastewater treatment device, including an upper infiltration zone and a lower infiltration zone; wherein the lower infiltration zone consists of, from top to bottom: a cover layer, an upper diffused water layer, an upper fine filter layer, an upper fine filter layer, a diffused water-ventilation layer, a middle fine filter layer, a middle fine filter layer, a lower diffused water layer, a lower coarse filter layer, and a guide layer; the upper infiltration zone consists of, from bottom to top: a guide layer, a phosphorus removal layer, and a vegetation layer; the lower infiltration zone and the upper infiltration zone are connected at the bottom guide layer.

[0004] The invention patent with announcement number CN102001743A discloses an aerobic land treatment system for wastewater, including a trench excavated below ground level, with impermeable membranes lining the sides and bottom. From bottom to top, the layers are: a sand layer, a water distribution layer, a filler and water collection layer, and a soil layer. The system is characterized by further including a blower aeration system consisting of a blower, an air diffusion device, and connecting pipes. The air diffusion device is located below the water surface of the land treatment system and is connected to the blower through pipes. Pretreated wastewater enters the land treatment system, and air is pressurized by the blower and diffused into the wastewater in the form of small bubbles through the air diffusion device.

[0005] The aforementioned technical solutions have the following drawbacks: all of the above-mentioned sewage treatment systems require civil construction, such as building a concrete pool, which results in high civil construction costs and makes it difficult to quickly achieve large-scale coverage in rural areas. In addition, the components of the sewage treatment system are mostly soil and gravel, which are heavy and difficult to transport. Summary of the Invention

[0006] This application provides a modular land infiltration system, which features modular sewage infiltration treatment, can be prefabricated, and is convenient to transport to the site for use.

[0007] The modular land infiltration system provided in this application adopts the following technical solution:

[0008] A modular land infiltration system includes an upper infiltration zone and a lower infiltration zone. The upper infiltration zone includes a number of support layers arranged longitudinally at intervals, a number of module layers spliced ​​between two adjacent support layers, and a number of upper infiltration enclosures spliced ​​on the outside of the module layers to surround the support layers and module layers of the upper infiltration zone.

[0009] The infiltration zone includes several module layers that are longitudinally spliced ​​together, and several infiltration enclosure plates that are spliced ​​around the module layers of the infiltration zone to surround the module layers of the infiltration zone.

[0010] The support layer at the bottom of the upper infiltration zone is spliced ​​with the module layer at the top of the lower infiltration zone;

[0011] The module layer is used to lay the infiltration packing material. The packing material in the upper infiltration zone consists of a water distribution layer, a fine filter layer, a coarse filter layer, and an aeration-return air layer from top to bottom. The packing material in the lower infiltration zone consists of a fine filter layer, a coarse filter layer, an aeration-return air layer, and an anaerobic layer from top to bottom.

[0012] By adopting the above technical solution, the upper and lower infiltration zones are designed with a modular structure, realizing modular sewage infiltration treatment. There is no need for civil construction such as concrete pouring tanks. It can be prefabricated and conveniently and quickly transported to the site for use. Sewage is filtered from top to bottom through a fine filter layer, a coarse filter layer, an aeration-return air layer, a fine filter layer, a coarse filter layer, an aeration-return air layer, and an anaerobic layer. After filtration, it enters the anaerobic reaction zone to undergo anaerobic decomposition reaction and is finally discharged from the device, thus achieving sewage treatment.

[0013] Preferably, the module layer includes multiple interconnected percolation modules, the support layer includes multiple interconnected percolation trays, and the percolation modules on adjacent module layers in the lower percolation zone are symmetrically arranged; the percolation modules on multiple module layers in the upper percolation zone are unidirectionally arranged; each percolation module includes a percolation base and multiple percolation platforms, the percolation platforms are evenly distributed on one side of the percolation base, multiple percolation platforms on two oppositely arranged percolation modules are interconnected, two percolation bases on two oppositely arranged percolation modules are interconnected, multiple percolation platforms on two oppositely arranged percolation modules are interconnected, and two percolation bases on two oppositely arranged percolation modules are interconnected;

[0014] When the percolation tray is located below the percolation module, the percolation tray is used to support the percolation module and is spliced ​​on the percolation base of the percolation module. When the percolation tray is located above the percolation module, the percolation tray abuts against and is spliced ​​on several percolation platforms of the percolation module.

[0015] By adopting the above technical solution, multiple percolation modules are spliced ​​together, and percolation modules and percolation trays are also spliced ​​together, which can improve the tightness of the connection between different modules, thereby strengthening the overall structural strength of the percolation system.

[0016] Preferably, the percolation modules include multiple percolation tables of the same number of insert blocks and multiple connecting blocks, which are distributed at intervals. The ends of the insert blocks and connecting blocks on adjacent percolation modules are interlocked.

[0017] By adopting the above technical solution, the percolation modules of adjacent layers are connected by connecting blocks and insert blocks.

[0018] Preferably, the percolation tray has multiple insertion holes that are engaged with the end of the insert block. When the percolation tray is located below the percolation module and installed on the percolation module, the multiple insertion holes correspond to multiple percolation tables on the percolation module, and the end of the insert block is inserted into the insertion hole.

[0019] By adopting the above technical solution, the connecting blocks on the percolation module can be connected to the percolation support plate. The percolation module has multiple connection forms, which makes it convenient for operators to build the upper and lower percolation support frames.

[0020] Preferably, the percolation table is tapered from the end near the percolation base to the end away from the percolation base.

[0021] By adopting the above technical solution, while maintaining structural strength, the packing material placed in the percolation platform can be more easily leaked out from the inclined side, which facilitates the spreading of the packing material during filling and speeds up the spreading speed.

[0022] Preferably, the side of the percolation base away from the percolation table and the bottom surface of the percolation tray are recessed to form at least one longitudinal channel and at least one transverse channel, wherein the longitudinal channel and the transverse channel are perpendicular to each other and interconnected.

[0023] When the percolation tray is located above the percolation module and installed on the percolation module, the percolation tray abuts against the percolation base. The two opposing longitudinal channels on the percolation tray and the percolation base are interconnected to form a longitudinal through hole for the pipe to pass through. The two opposing transverse channels are interconnected to form a transverse through hole for the pipe to pass through.

[0024] When the two percolation bases of two adjacent module layers are spliced ​​together, the two opposite longitudinal channels are interconnected to form a longitudinal through hole for the pipe to pass through, and the two opposite transverse channels are interconnected to form a transverse through hole for the pipe to pass through.

[0025] The longitudinal and transverse channels are provided with multiple perforations for pipes to pass through. When two percolation bases of two adjacent module layers are spliced ​​together or when the percolation support plate is located above the percolation module and installed on the percolation module, the multiple perforations are arranged facing each other.

[0026] By adopting the above technical solution, whether in the upper or lower infiltration zone, or when multiple infiltration modules are spliced ​​together, or when infiltration modules and infiltration support plates are spliced ​​together, longitudinal and transverse through holes can be formed for pipes to pass through. This allows pipe holes to be reserved in each layer, making it convenient for operators to lay pipes. At the same time, since the pipe layout will have multiple branches, the through holes can facilitate the installation of pipe branches, thus better adapting to different construction conditions.

[0027] Preferably, the water distribution layer is filled with 3-15 mm volcanic rock, 5-20 mm phosphorus removal filler, and 5-20 mm gravel, and the fine filter layer and coarse filter layer are filled with river sand, volcanic rock, phosphorus removal filler, and zeolite.

[0028] By adopting the above technical solution, wastewater enters the diffused water distribution layer. Most of the wastewater seeps directly downwards under gravity, while a portion seeps downwards while flowing laterally within the packing material of the diffused water distribution layer, thus ensuring a uniform distribution of wastewater on a horizontal plane. Particulate organic matter in the wastewater is intercepted by the coarse and fine filter layers and dispersed within each layer due to its different particle size. Subsequently, it is decomposed by microorganisms on the surface of the packing material after successful biofilm formation.

[0029] Preferably, the anaerobic layer is filled with solid or fluidized bed packing material.

[0030] By adopting the above technical solution, the leachate wastewater stays in the anaerobic reaction zone for a long hydraulic retention time, forming an anaerobic environment where the wastewater undergoes further anaerobic decomposition reactions.

[0031] Preferably, a water distribution network is buried in the water distribution layer, which is used to pass sewage into the infiltration system; an air distribution network is buried in the aeration-return air layer, which is used to connect with an external blower aerator; a ventilation network is buried in the aeration-return air layer, which is used to connect with the atmosphere; and the water distribution network, air distribution network and ventilation network are provided with guide holes spaced apart on the side wall.

[0032] By adopting the above technical solution, the oxygen content continuously decreases during the infiltration process of sewage due to the degradation of the biofilm. Therefore, by using a blower aerator to intermittently aerate the aeration-return air layer through the air distribution network (the aeration period is synchronized with the water distribution period), oxygen is supplemented to the device while ensuring the ventilation performance of the system, enhancing the aerobic decomposition of pollutants by microorganisms, and thus improving the pollution load capacity of the infiltration system.

[0033] The main technical effects of this invention are reflected in the following aspects:

[0034] 1. This invention achieves modular sewage infiltration treatment through the modular structural design of the upper and lower infiltration zones. It eliminates the need for civil construction such as concrete pouring tanks and can be prefabricated, conveniently and quickly transported to the site for use.

[0035] 2. The present invention features a gradually tapering design from the end of the percolation platform near the percolation base to the end away from the percolation base. This design allows the filler material placed in the percolation platform to leak out more smoothly from the inclined side while maintaining structural strength. This facilitates the spreading of the filler material during filling and speeds up the spreading process.

[0036] 3. By setting up a water distribution network, an air distribution network, and a ventilation network, the oxygen content continuously decreases during the infiltration process of sewage due to the degradation of the biofilm. Therefore, a blower is used in conjunction with the air distribution network to intermittently aerate the aeration-return air layer (the aeration period is synchronized with the water distribution period). This replenishes the oxygen to the device while ensuring the ventilation performance of the system, enhancing the aerobic decomposition of pollutants by microorganisms, thereby improving the pollution load capacity of the infiltration system. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0038] Figure 2 This is a schematic diagram of the structure after the upper and lower infiltration zones are assembled according to an embodiment of this application.

[0039] Figure 3 This is a schematic diagram of the assembly structure of multiple percolation modules in the infiltration zone according to an embodiment of this application.

[0040] Figure 4 This is a schematic diagram of the structure in which the percolation bases of two adjacent percolation modules in an embodiment of this application are spliced ​​together.

[0041] Figure 5 This is a schematic diagram of the splicing of two adjacent percolation modules in the same module layer according to an embodiment of this application.

[0042] Figure 6 yes Figure 4 Enlarged view of point A in the middle.

[0043] Figure 7 yes Figure 5 Enlarged view of point B in the middle.

[0044] Figure 8 This is a schematic diagram of the assembly structure of multiple percolation modules and multiple percolation trays in the upper percolation zone of this application embodiment.

[0045] Figure 9 This is a schematic diagram of the structure of the percolation tray in an embodiment of this application.

[0046] Figure 10This is a schematic diagram of the assembly of the upper and lower infiltration enclosures in an embodiment of this application.

[0047] Figure 11 This is a schematic diagram of the structure of the infiltration enclosure in an embodiment of this application.

[0048] Figure 12 This is a schematic diagram of the layer structure of the packing material in the percolation system of this application embodiment.

[0049] Explanation of reference numerals in the attached drawings: 101, Module layer; 102, Support layer; 1, Infiltration module; 11, Infiltration base; 111, Clearance groove; 112, First positioning groove; 113, Second positioning groove; 114, Slot; 12, Infiltration platform; 121, Insert block; 122, Connecting block; 2, First positioning block; 3, Second positioning block; 41, Longitudinal channel; 42, Transverse channel; 43, Longitudinal through hole; 44, Transverse through hole; 45, Perforation; 51, Infiltration support plate; 511, Insertion hole; 52, Raised grid; 61, Upper infiltration enclosure plate; 62, Lower infiltration enclosure plate; 63, Slot; 64, Abutment block; 65, Inclined surface; 71, Water distribution layer; 72, Fine filter layer; 73, Coarse filter layer; 74, Aeration-return air layer; 75, Anaerobic layer. Detailed Implementation

[0050] The following is in conjunction with the appendix Figure 1-12 This application will be described in further detail to make the technical solution of this application easier to understand and master.

[0051] This application discloses a modular land infiltration system.

[0052] Reference Figures 1-9 The modular land infiltration system of this embodiment includes an upper infiltration zone and a lower infiltration zone, with the upper infiltration zone located above the lower infiltration zone. The upper infiltration zone includes a plurality of support layers 102 spaced apart along the height direction, a plurality of module layers 101 spliced ​​between two adjacent support layers, and a plurality of upper infiltration enclosure panels 61 spliced ​​outside the module layers 101 to surround the support layers 102 and module layers 101 of the upper infiltration zone.

[0053] The infiltration zone includes several module layers 101 sequentially spliced ​​along the longitudinal direction, and several infiltration enclosure plates 62 spliced ​​around the module layers 101 of the infiltration zone to surround the module layers 101 of the infiltration zone. The support layer 102 located at the bottom of the upper infiltration zone is spliced ​​with the module layer 101 at the top of the infiltration zone.

[0054] Reference Figures 1-9 The module layer 101 includes multiple interconnected infiltration modules 1, and the support layer 102 includes multiple interconnected infiltration trays 51. The infiltration modules 1 in the upper infiltration zone and the lower infiltration zone have the same structure, and the layers are interconnected. The upper infiltration zone and the lower infiltration zone are connected through the support layer 102.

[0055] Reference Figures 1-9 In the lower infiltration zone, the infiltration modules 1 on adjacent module layers 101 are symmetrically arranged, providing good support and increasing the stability of the bottom. In the upper infiltration zone, the infiltration modules 1 on adjacent module layers 101 are unidirectionally arranged. Under the action of the support layer 102, each module layer 101 in the upper infiltration zone is both independent and interconnected. The filler material in each layer can be evenly spread within the module, and if the top filler material becomes clogged later, the clogged layer can be removed and replaced individually without damaging other module layers 101.

[0056] Reference Figures 1-9 The upper and lower infiltration zones are designed with a modular structure, enabling modular sewage infiltration treatment. This eliminates the need for concrete pouring tanks and other civil engineering construction, allowing for prefabrication and convenient and rapid transportation to the site for use.

[0057] Reference Figures 1-9 The percolation module 1 includes a percolation base 11 and eight percolation platforms 12, which are evenly distributed in two rows and four columns on the same side of the percolation base 11. When multiple percolation modules 1 on the same layer are assembled, the two percolation bases 11 on two adjacent percolation modules 1 on the same module layer 101 are joined together. In the lower percolation zone, when multiple percolation modules 1 on two adjacent module layers 101 are assembled, the multiple percolation platforms 12 on two opposite percolation modules 1 are joined together, and the two percolation bases 11 on two opposite percolation modules 1 are joined together.

[0058] Reference Figures 1-9 In the infiltration zone, the infiltration modules 1 of two adjacent module layers 101 are spliced ​​together by multiple infiltration platforms 12 or two infiltration bases 11. Two adjacent infiltration modules 1 located in the same module layer 101 can be spliced ​​together by two infiltration bases 11, which has good structural strength.

[0059] Reference Figures 1-9 The eight percolation platforms 12 on the same percolation module 1 can be divided into four insertion blocks 121 and four connecting blocks 122, with the eight insertion blocks 121 and eight connecting blocks 122 distributed at intervals. The ends of the oppositely arranged insertion blocks 121 and connecting blocks 122 are interlocked. In the infiltration zone, when multiple percolation platforms 12 of two adjacent percolation modules 1 face each other, they can be connected by inserting the insertion blocks 121 and connecting blocks 122.

[0060] Reference Figures 1-9This embodiment of a modular land infiltration system also includes multiple first positioning blocks 2 and multiple second positioning blocks 3. In the infiltration zone, two infiltration bases 11 of two adjacent module layers 101 are connected by the first positioning blocks 2. Multiple first positioning grooves 112 that are interference-fitted with the ends of the first positioning blocks 2 are provided on the side of the infiltration base 11 away from the infiltration platform 12. The two ends of the first positioning blocks 2 are respectively inserted into the two opposing first positioning grooves 112 on the two adjacent module layers 101 infiltration bases 11, thereby connecting the two opposing infiltration bases 11 of the two adjacent module layers 101. After connection, the facing sides of the two infiltration bases 11 are in contact with each other.

[0061] Reference Figures 1-9 Two adjacent percolation modules 1 located on the same module layer 101 are connected by a second positioning block 3. Two second positioning grooves 113, which are interference-fitted with the ends of the second positioning blocks 3, are provided on the side of the percolation base 11 facing away from the percolation table 12. The two second positioning grooves 113 are located at opposite ends of the length of the percolation base 11. The two ends of the second positioning block 3 are respectively engaged into the two second positioning grooves 113 of the adjacent percolation base 11. The interference fit between the second positioning block 3 and the two second positioning grooves 113 enables the connection of two adjacent percolation bases 11 on the same layer.

[0062] Reference Figures 1-9 In the upper infiltration zone, when the percolation support plate 51 is located below the percolation module 1, the percolation support plate 51 is spliced ​​with several percolation platforms 12 in the percolation module 1. The percolation support plate 51 has multiple insertion holes 511 that are inserted into the ends of the insertion blocks 121. When the percolation support plate 51 is located below the percolation module 1 and installed on the percolation module 1, the multiple insertion holes 511 correspond to the multiple percolation platforms 12 on the percolation module 1, and the ends of the insertion blocks 121 are inserted into the insertion holes 511.

[0063] Reference Figures 1-9 The infiltration module 1 can be connected to another infiltration module 1 or to the infiltration support plate 51, and has multiple connection forms. It is a universal component in the upper infiltration zone and the lower infiltration zone, which makes it convenient for operators to build the upper infiltration zone and the lower infiltration zone.

[0064] Reference Figures 1-9 In the upper infiltration zone, when the percolation tray 51 is positioned above the percolation module 1, it is spliced ​​with the percolation base 11 in the percolation module 1. Eight raised grids 52 are formed outwardly on the bottom surface of the percolation tray 51, each corresponding to one of eight clearance slots 111. When the percolation tray 51 is placed on the percolation base 11, the raised grids 52 are inserted into the corresponding clearance slots 111. The cooperation between the raised grids 52 and the clearance slots 111 restricts the position of the percolation tray 51 on the percolation base 11, improving the connection stability between the module layer 101 and the support layer 102.

[0065] Reference Figures 1-9 The percolation table 12 is tapered from the end near the percolation base 11 to the end away from the percolation base 11. This design allows the packing material placed in the percolation table 12 to drain more smoothly from the inclined side while maintaining structural strength. It also facilitates packing material spreading during filling and speeds up the spreading process.

[0066] Reference Figures 1-9 On the side of the percolation base 11 away from the percolation table 12 and on the concave bottom surface of the percolation tray 51, there is a longitudinal channel 41 and two transverse channels 42, which are arranged in an arch shape. The longitudinal channel 41 and the transverse channels 42 are perpendicular to each other and interconnected. In the upper percolation zone and at the connection between the upper and lower percolation zones, when the percolation tray 51 is located above the percolation module 1 and installed on the percolation module 1, the percolation tray 51 abuts against the percolation base 11. The two opposing longitudinal channels 41 on the percolation tray and the percolation base 11 are interconnected to form a longitudinal through hole 43 for a pipe to pass through, and the two opposing transverse channels 42 are interconnected to form a transverse through hole 44 for a pipe to pass through.

[0067] Reference Figures 1-9 In the infiltration zone, when the two percolation bases 11 of two adjacent module layers 101 are spliced ​​together, the two opposing longitudinal channels 41 are interconnected to form a longitudinal through hole 43 for the pipe to pass through, and the two opposing transverse channels 42 are interconnected to form a transverse through hole 44 for the pipe to pass through.

[0068] Reference Figures 1-9 Regardless of whether it is in the upper or lower infiltration zone, multiple percolation modules 1 are spliced ​​together, or percolation module 1 and percolation support plate 51 are spliced ​​together, longitudinal through holes 43 and transverse through holes 44 can be formed for pipes to pass through, so that pipe holes can be reserved in each layer, making it convenient for operators to lay out the pipes.

[0069] Reference Figures 1-9 Multiple perforations 45 are provided on the inner walls of the longitudinal channel 41 and the transverse channel 42 for pipes to pass through. When the two percolation bases 11 of two adjacent module layers 101 are spliced ​​together or the percolation support plate 51 is located above the percolation module 1 and installed on the percolation module 1, the multiple perforations 45 are arranged facing each other. Since the pipeline layout may have multiple branches, the perforations 45 can facilitate the installation of pipeline branches, thereby better adapting to different construction conditions.

[0070] Reference Figures 10-11Multiple slots 114 are sequentially formed along the outer contour of the outer wall of the percolation base 11. In the upper percolation zone, the upper percolation enclosure 61 encloses one layer of the percolation module 1. Multiple locking blocks 63, matching the corresponding outer wall of the percolation base 11, are fixed to the top of the upper percolation enclosure 61, and these blocks 63 engage with the corresponding slots 114. After the upper percolation enclosure 61 is installed, its upper and lower ends abut against the percolation base 11 and the percolation support plate 51, respectively. The upper percolation enclosure 61 does not interfere with the longitudinal through holes 43 and the transverse through holes 44.

[0071] Reference Figures 10-11 In the infiltration zone, adjacent layers of infiltration modules 1 arranged opposite each other on the infiltration platform 12 are enclosed by the same infiltration enclosure plate 62. The top and bottom ends of the infiltration enclosure plate 62 are respectively provided with multiple locking blocks 63 that match the corresponding outer wall of the infiltration base 11. The locking blocks 63 are engaged in corresponding slots 114. After the infiltration enclosure plate 62 is installed, its upper and lower ends abut against the two infiltration bases 11 respectively. The infiltration enclosure plate 62 does not interfere with the longitudinal through holes 43 and the transverse through holes 44.

[0072] Reference Figures 10-11 Multiple abutment blocks 64122 are fixed to the side of the infiltration enclosure 62 facing the infiltration module 1. The abutment blocks 64122 are directly opposite the splicing points of the multiple infiltration tables 12. Two inclined surfaces 65 are provided on the end of the abutment block 64122 facing the infiltration table 12, and the two inclined surfaces 65 abut against the inclined outer walls of the two infiltration tables 12 respectively. This can improve the support strength of the infiltration tables 12 in the infiltration zone and improve the stability of the entire infiltration system.

[0073] Reference Figure 12 In the use of modular land infiltration systems, an impermeable membrane is first laid on the ground, and then the supporting structure of the modular land infiltration system is built. The single-layer module layer 101 is used to lay a single layer of filler. The filler in the upper infiltration zone, from top to bottom, consists of a water distribution layer 71, a fine filter layer 72, a coarse filter layer 73, and an aeration-return air layer 74. The filler in the lower infiltration zone, from top to bottom, consists of a fine filter layer 72, a coarse filter layer 73, an aeration-return air layer 74, and an anaerobic layer 75.

[0074] Reference Figure 12 Domestic sewage first undergoes pretreatment processes such as oil separation and sedimentation, filtration, and anaerobic fermentation. Then, it is intermittently pumped into this modular infiltration system. From top to bottom, the sewage is filtered through a fine filter layer 72, a coarse filter layer 73, an aeration-return air layer 74, and an anaerobic layer 75. After filtration, it enters the anaerobic reaction zone where it undergoes anaerobic decomposition and is finally discharged from the device, thus achieving sewage treatment.

[0075] Reference Figure 12The water distribution layer 71 is filled with volcanic rock (3-15 mm), phosphorus removal filler (5-20 mm), and gravel (5-20 mm). When sewage enters the water distribution layer 71, most of the sewage seeps directly downwards under gravity, while a portion of the sewage seeps downwards while flowing laterally within the filler material of the water distribution layer 71, thus ensuring that the sewage is evenly distributed on the horizontal plane.

[0076] Reference Figure 12 The fine filter layer 72 and the coarse filter layer 73 are filled with river sand, volcanic rock, phosphorus removal packing, zeolite, and other packing materials. The aeration-return air layer 74 is filled with volcanic rock, phosphorus removal packing, and other packing materials.

[0077] Reference Figure 12 After successful biofilm formation on the packing material, microorganisms will grow on the surface of the packing material in each packing layer of the system, forming a biofilm. Small amounts of particulate organic matter in the wastewater will be intercepted by the coarse filter layer 73 and dispersed within each coarse filter layer 73 and fine filter layer 72 due to their different particle sizes. This is then decomposed by microorganisms during the drying period. Dissolved organic matter is adsorbed by the packing material and further degraded by the biofilm on the packing surface. NH4+ is converted to NO3- through nitrification under aerobic conditions in each packing layer, and then enters the anaerobic cavity for removal through denitrification. Phosphorus is mainly removed through adsorption in each packing layer.

[0078] Reference Figure 12 The anaerobic layer 75 is filled with solid or fluidized bed packing. The leachate remains in the anaerobic reaction zone for a long hydraulic retention time, creating an anaerobic environment where further anaerobic decomposition occurs. The anaerobic layer 75 is filled with elastic packing containing numerous voids, which increases microbial growth and provides strong water retention capacity, ensuring denitrification and enhancing the removal efficiency of pollutants from the leachate system while preventing excessively high suspended solids concentrations in the effluent. Solid waste generated during the reaction first settles at the bottom of the anaerobic reaction zone, then further settles in the sedimentation zone before being discharged from the device.

[0079] Reference Figure 12 The water distribution layer 71 is equipped with a water distribution network for introducing sewage into the infiltration system; the aeration-return air layer 74 is equipped with an air distribution network for connecting to an external blower aerator; the aeration-return air layer 74 is equipped with a ventilation network for connecting to the atmosphere; the water distribution network, air distribution network and ventilation network are provided with guide holes spaced apart on the side wall.

[0080] Reference Figure 12During the infiltration process of sewage, the oxygen content continuously decreases due to the degradation of the biofilm. Therefore, a blower is used in conjunction with the aeration system to intermittently aerate the aeration-return air layer 74 through the air distribution network (the aeration period is synchronized with the water distribution period). This replenishes the oxygen to the device while ensuring the ventilation performance of the system, enhancing the aerobic decomposition of pollutants by microorganisms, and thus improving the pollution load capacity of the infiltration system.

[0081] Of course, the above are just typical examples of this application. In addition, this application may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed in this application.

Claims

1. A modular land infiltration system, characterized in that: It includes an upper infiltration zone and a lower infiltration zone. The upper infiltration zone includes a plurality of support layers (102) arranged longitudinally at intervals, a plurality of module layers (101) spliced ​​between two adjacent support layers (102), and a plurality of upper infiltration enclosure plates (61) spliced ​​on the outside of the module layers (101) to surround the support layers (102) and module layers (101) of the upper infiltration zone. The infiltration zone includes a number of module layers (101) longitudinally spliced ​​together, and a number of infiltration enclosure plates (62) spliced ​​around the module layers (101) of the infiltration zone to surround the module layers (101) of the infiltration zone. The support layer (102) located at the bottom of the upper infiltration zone is spliced ​​with the module layer (101) at the top of the lower infiltration zone; The module layer (101) is used to lay the filler for infiltration. The filler in the upper infiltration zone consists of a water distribution layer (71), a fine filter layer (72), a coarse filter layer (73), and an aeration-return air layer (74) from top to bottom. The filler in the lower infiltration zone consists of a fine filter layer (72), a coarse filter layer (73), an aeration-return air layer (74), and an anaerobic layer (75) from top to bottom. The module layer (101) includes multiple interconnected percolation modules (1), the support layer (102) includes multiple interconnected percolation trays (51), the percolation modules (1) on two adjacent module layers (101) in the lower percolation zone are symmetrically arranged; the percolation modules (1) on multiple module layers (101) in the upper percolation zone are unidirectionally arranged; the percolation module (1) includes a percolation base (11) and multiple percolation platforms (12), the percolation platforms (12) are evenly distributed on one side of the percolation base (11), the multiple percolation platforms (12) on two opposite percolation modules (1) are interconnected, the two percolation bases (11) on two opposite percolation modules (1) are interconnected, the multiple percolation platforms (12) on two opposite percolation modules (1) are interconnected, and the two percolation bases (11) on two opposite percolation modules (1) are interconnected; When the percolation tray (51) is located below the percolation module (1), the percolation tray (51) is used to support the percolation module (1) and is spliced ​​on the percolation base (11) of the percolation module (1). When the percolation tray (51) is located above the percolation module (1), the percolation tray (51) abuts against and is spliced ​​on several percolation tables (12) of the percolation module (1). The percolation module (1) includes multiple percolation tables (12) with the same number of inserts (121) and multiple connectors (122). The inserts (121) and multiple connectors (122) are distributed at intervals. The ends of the inserts (121) and connectors (122) on two adjacent percolation modules (1) are inserted into each other. The percolation tray (51) has multiple insertion holes (511) that are inserted into the end of the insertion block (121). When the percolation tray (51) is located below the percolation module (1) and installed on the percolation module (1), the multiple insertion holes (511) correspond to the multiple percolation tables (12) on the percolation module (1), and the end of the insertion block (121) is inserted into the insertion hole (511). The percolation platform (12) is set in a gradually narrowing shape from the end near the percolation base (11) to the end away from the percolation base (11).

2. The modular land infiltration system according to claim 1, characterized in that: The percolation base (11) has at least one longitudinal channel (41) and at least one transverse channel (42) recessed on the side away from the percolation table (12) and the bottom surface of the percolation tray (51). The longitudinal channel (41) and the transverse channel (42) are perpendicular to each other and connected to each other. When the percolation tray (51) is located above the percolation module (1) and installed on the percolation module (1), the percolation tray (51) abuts against the percolation base (11), the two opposing longitudinal channels (41) on the percolation tray and the percolation base (11) are interconnected to form a longitudinal through hole (43) for the pipe to pass through, and the two opposing transverse channels (42) are interconnected to form a transverse through hole (44) for the pipe to pass through; When the two percolation bases (11) of two adjacent module layers (101) are spliced ​​together, the two opposing longitudinal channels (41) are interconnected and form a longitudinal through hole (43) for pipes to pass through, and the two opposing transverse channels (42) are interconnected and form a transverse through hole (44) for pipes to pass through. The inner walls of the longitudinal channel (41) and the transverse channel (42) are provided with multiple perforations (45) for pipes to pass through. When the two percolation bases (11) of two adjacent module layers (101) are spliced ​​together or the percolation support plate (51) is located above the percolation module (1) and installed on the percolation module (1), the multiple perforations (45) are arranged facing each other.

3. The modular land infiltration system according to claim 1, characterized in that: The water distribution layer (71) is filled with 3-15 mm volcanic rock, 5-20 mm phosphorus removal filler and 5-20 mm gravel, and the fine filter layer (72) and coarse filter layer (73) are filled with river sand and volcanic rock, phosphorus removal filler and zeolite.

4. A modular land infiltration system according to claim 1, characterized in that: The anaerobic layer (75) is filled with solid or fluidized bed packing material.

5. A modular land infiltration system according to claim 1, characterized in that: The water distribution layer (71) is provided with a water distribution network, which is used to pass sewage into the infiltration system; the aeration-return air layer (74) is provided with an air distribution network, which is used to connect with an external blower aerator; the aeration-return air layer (74) is provided with a ventilation network, which is used to connect with the atmosphere; the water distribution network, the air distribution network and the ventilation network are provided with guide holes spaced apart on the side wall.

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