Fabricated land percolation and purification system suitable for decentralized sewage treatment

Abstract

The utility model discloses an assembled land percolation and purification system suitable for decentralized sewage treatment, and belongs to the technical field of sewage treatment. An impermeable membrane is arranged in earth under the earth surface, a bottom supporting layer, a percolation layer and a soil layer are sequentially arranged in the impermeable membrane from bottom to top, a double-layer cylinder is arranged in the percolation layer, the top of the double-layer cylinder is connected with a manhole pipe which is arranged on the soil layer and extends out of the earth surface, and a manhole cover is arranged on the manhole pipe; the double-layer cylinder is divided into an I-zone adjusting sedimentation tank and an II-zone water collecting tank by an outer cylinder wall and an inner cylinder wall, a main water inlet pipe and a plurality of water inlet perforated pipes are connected along the upper portion of the outer cylinder wall, the main water inlet pipe is connected with a water distribution pipe in the I-zone adjusting sedimentation tank, a plurality of water collecting perforated pipes penetrating through the outer cylinder wall are arranged on the inner cylinder wall, and the upper portion of the outer cylinder wall is connected with a main water outlet pipe. The main water inlet pipe and the main water outlet pipe penetrate through the impermeable membrane; sewage enters the I-area adjusting sedimentation tank through the main water inlet pipe, is settled and baffled, then enters the II-area water collecting tank through the percolation layer, and is discharged out of the system through the main water outlet pipe after being purified. The device is easy to install, small in occupied area, safe and reliable in operation and has anti-blocking measures.

Description

Technical Field

[0001] The present invention belongs to the field of sewage treatment technology, and in particular relates to an assembled land infiltration purification system suitable for decentralized sewage treatment. Background Art

[0002] The most representative of the existing soil infiltration sewage treatment technology is the invention patent with application publication number: CN103304029A. It is used for decentralized sewage treatment in rural areas and mainly includes sedimentation tanks, soil infiltration systems, water distribution pipes, and water collection wells. In addition to building a soil infiltration system, it is also necessary to build a sedimentation tank and a water collection tank separately. The equipment occupies a large area and has a large construction area. In addition, the winter in the north is cold, and the above-mentioned facilities need to be buried below the frozen layer, which requires a large amount of earth excavation. Especially for the courtyard construction sites in the north where households are used as units, the application is limited. There is no forward washing or backwashing function, and there is a lack of effective measures to prevent the perforated pipes and the infiltration system from being blocked. It is usually not equipped with mud and sand cleaning functions. Various pipelines need to be assembled along with the civil construction, and the installation size and installation position accuracy of the pipelines are not easy to guarantee, which affects the water distribution effect. Summary of the Invention

[0003] In response to the above-mentioned technical problems, the present invention provides an assembled land infiltration purification system suitable for decentralized sewage treatment.

[0004] The object of the present invention is achieved through the following technical solutions:

[0005] The present invention discloses an assembled land infiltration purification system suitable for decentralized sewage treatment, comprising a double-layer cylinder, a manhole pipe, a manhole cover, an impermeable membrane, a soil layer, a percolation layer and a bottom supporting layer. The impermeable membrane is arranged in the earthwork under the surface, and the bottom supporting layer, the percolation layer and the soil layer are arranged in sequence from bottom to top in the impermeable membrane. The double-layer cylinder is arranged in the percolation layer, and the top cylinder mouth extends out of the percolation layer to connect to the manhole pipe placed in the soil layer, and the top of the manhole pipe extends out of the ground surface, and a manhole cover is arranged on it; a zone I regulating sedimentation tank is formed between the outer cylinder wall and the inner cylinder wall of the double-layer cylinder, and the internal space of the inner cylinder wall is a zone II water collecting tank, a total water inlet pipe interface is arranged along the upper part of the outer periphery of the outer cylinder wall, and the total water inlet pipe is connected to it; and below the total water inlet pipe interface, a plurality of water inlet perforated pipe interfaces are evenly spaced at the same height along the outer periphery of the outer cylinder wall, and the water inlet perforated pipes are respectively connected to them, and the total water inlet pipe is connected to the water distribution pipe placed in the zone I regulating sedimentation tank, and the water distribution pipe is connected to the water distribution pipe placed in the zone I regulating sedimentation tank. A plurality of water-collecting perforated pipe connections passing through the outer cylinder wall are evenly spaced around the circumference, and the water-collecting perforated pipes are connected thereto respectively. A plurality of water-permeable holes are set on the lower end faces of the water inlet perforated pipe and the water-collecting perforated pipe; a total water outlet pipe connection is connected to the upper part of the inner cylinder wall below the water inlet perforated pipe, and the total water outlet pipe connection passes through the outer cylinder wall and is connected to the total water outlet pipe. The water inlet end of the total water inlet pipe and the water outlet end of the total water outlet pipe both pass through the anti-seepage membrane; the water inlet perforated pipe and the water-collecting perforated pipe are evenly spaced around the circumference Arranged in evenly spaced staggered arrangements; sewage enters the double-drum Zone I regulating sedimentation tank through the main water inlet pipe and the water distribution pipe, enters the water inlet perforated pipe after sedimentation and deflection, flows out from the water perforated pipe into the infiltration layer, and after filtration, ammonia removal and denitrification purification in the infiltration layer, enters the Zone II water collection tank through the water perforated pipe. The purified water in the water collection tank is directly discharged to the outside of the system through the main outlet pipe, or discharged to the surface for irrigation of plants through a submersible sewage pump and a drainage hose.

[0006] Furthermore, the infiltration layer is composed of a bottom gravel layer, a small-particle natural zeolite layer and a top gravel layer from bottom to top; the thickness h1 of the bottom gravel layer is 200-300 mm, and the particle size is 20-30 mm, the thickness h2 of the small-particle natural zeolite layer is 800-1000 mm, and the particle size is 3-6 mm, and the thickness h3 of the top gravel layer is 200-300 mm, and the particle size is 20-30 mm.

[0007] Furthermore, the double-layer cylinder is a carbon steel structure and is divided into two areas by an outer cylinder wall and an inner cylinder wall. The annular space formed by the outer cylinder wall and the inner cylinder wall is the zone I regulating sedimentation tank, and the internal space of the inner cylinder wall is the zone II water collection tank. The volume ratio of the zone I regulating sedimentation tank to the zone II water collection tank is 1:1.3~1.5; the height difference between the inner and outer cylinder walls is 150~250mm.

[0008] Furthermore, a total water inlet pipe interface and a water inlet perforated pipe interface are provided on the outer periphery of the outer cylinder wall, and a water collection perforated pipe interface and a total water outlet interface are provided from the outer periphery of the inner cylinder wall through the outer cylinder wall. A connecting flange is provided on the above interfaces, and the connecting flange is connected to the main water inlet pipe, water inlet perforated pipe, main water outlet pipe, and connecting flange provided at the end of the water collection perforated pipe connected thereto by bolts and nuts.

[0009] Furthermore, the main water inlet pipe and multiple water inlet perforated pipes are placed in the top gravel layer of the infiltration layer, and the water collection perforated pipe is placed in the bottom gravel layer of the infiltration layer; the main water outlet pipe is placed on the top of the small-particle natural zeolite layer, and the angle β between the axis of the several water-permeable holes arranged on the lower end faces of the water collection perforated pipe and the water inlet perforated pipe and the vertical line is 45 degrees, and they are arranged crosswise.

[0010] Furthermore, the bottom supporting layer is a fine sand layer, and the thickness H1 of the fine sand layer is 100 mm; the thickness H2 of the soil layer is 300 to 1200 mm.

[0011] Furthermore, the manhole pipe and the double-layer tube are eccentrically arranged, and the eccentric distance W is 150 to 250 mm.

[0012] Furthermore, a drainage hose is connected to the submersible sewage pump, and a hose valve is provided on the drainage hose. When the submersible sewage pump is placed in the water collection tank of zone II of the double-layer cylinder, the water outlet end of the drainage hose extends out of the manhole cover and is discharged to the surface for irrigation; or the drainage hose is extended into the regulating sedimentation tank of zone I for forward washing; or the submersible sewage pump is placed in the regulating sedimentation tank of zone I, and the water outlet end of the drainage hose extends out of the manhole cover to discharge water outside the system for backwashing.

[0013] The beneficial effects of the present invention are:

[0014] 1. This invention is designed for a soil infiltration system for treating household-based rural domestic sewage in northern China. This rural sewage system, which is used by households in northern China, is characterized by small volumes, unstable flow rates, and intermittent drainage. Construction must be done within a courtyard, resulting in limited working space. This system also requires the use of a safe and reliable facility that is simple to operate and maintain.

[0015] 2. The double-layered drum system of this invention integrates a regulating sedimentation tank, a water collection tank, a water inlet perforated pipe, and a water collection perforated pipe. It is factory-fabricated and assembled on-site. This system has a small construction area and requires minimal excavation. It is simple to construct, shortening construction time and saving construction costs. The installation dimensions are factory-fabricated to ensure construction quality. It has a simple structure and safe and reliable operation.

[0016] 3. The present invention has the functions of forward washing, backwashing and cleaning mud and sand, which effectively prevents system blockage, and the system has a longer service life and is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic cross-sectional structural diagram of the present invention.

[0018] Figure 2 for Figure 1 AA direction top view.

[0019] Figure 3 This is the layout diagram of the water inlet perforated pipe and the water collection perforated pipe and permeable pipe.

[0020] Figure 4 for Figure 3 Schematic diagram of direction B.

[0021] In the figure: 1 manhole cover; 2 manhole pipe; 3 top gravel layer; 4 water inlet perforated pipe; 5 main water outlet pipe; 6 small-grain natural zeolite layer; 7 bottom gravel layer; 8 water collection perforated pipe; 9 bottom supporting layer; 10 original soil; 11 anti-seepage membrane; 12 submersible sewage pump; 13 drainage hose; 14 flange; 15 bolts and nuts; 16 double-layer cylinder; 17 water distribution pipe; 18 main water inlet pipe; 19 water outlet valve; 20 hose valve; 21 soil layer; 22 outer cylinder wall; 23 inner cylinder wall. DETAILED DESCRIPTION

[0022] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0023] Example 1: Figure 1 、 Figure 2As shown, the present invention is an underground assembled infiltration purification system suitable for decentralized sewage treatment, comprising a double-layer cylinder 16, a manhole pipe 2, a manhole cover 1, an impermeable membrane 11, a soil layer 21, a percolation layer and a bottom support layer 9. The impermeable membrane 11 is arranged on the original soil 10 in the subsurface earthwork and on the inner periphery of the earthwork. The bottom of the impermeable membrane 11 is arranged in sequence from bottom to top. The double-layer cylinder 16 is arranged in the percolation layer, and the top cylinder mouth extends out of the percolation layer to connect to the manhole placed in the soil layer 21. Pipe 2, the top of the manhole pipe 2 extends out of the ground, and a manhole cover 1 is set on it; the outer cylinder wall 22 and the inner cylinder wall 23 of the double-layer cylinder 16 form a zone I regulating sedimentation tank, and the internal space of the inner cylinder wall is a zone II water collection tank. A total water inlet pipe interface is set along the upper part of the outer periphery of the outer cylinder wall, and the total water inlet pipe 18 is connected to it; and below the total water inlet pipe interface, a plurality of water inlet perforated pipe interfaces are set at the same height along the outer periphery of the outer cylinder, which are respectively connected to the water inlet perforated pipe 4, and the total water inlet pipe 18 is connected to the water distribution pipe 17 placed in the outer cylinder, and the water distribution pipe 17 is placed in the inner cylinder. The outer periphery of the bottom of the cylinder wall is evenly spaced and connected with a plurality of water-collecting perforated pipes passing through the outer cylinder, which are respectively connected to the water-collecting perforated pipes 8. The water inlet perforated pipe and the water-collecting perforated pipe are arranged horizontally, and a plurality of water-permeable holes are arranged on their lower end faces; the outer periphery of the upper part of the inner cylinder wall below the water inlet perforated pipe 4 is evenly spaced and connected with the total water outlet pipe. The total water outlet pipe passes through the inner cylinder wall 22 and is connected to the total water outlet pipe 5. The water inlet end of the total water inlet pipe 18 and the water outlet end of the total water outlet pipe 5 both pass through the anti-seepage membrane 11. The water inlet perforated pipe 4, the water-collecting perforated pipe The pipes 8 are staggered and arranged at even intervals along the circumference; the sewage enters the double-layer cylinder's Zone I regulating sedimentation tank through the main water inlet pipe 18 and the water distribution pipe 17, enters the water inlet perforated pipe 4 after sedimentation and deflection, flows out from the water perforated pipe 4 into the infiltration layer through the water permeable holes, and after filtration, ammonia removal and denitrification purification in the infiltration layer, enters the Zone II water collection tank through the water permeable holes on the water collection perforated pipe 8. The purified water in the water collection tank is directly discharged to the outside of the system through the main outlet pipe 5, or discharged to the surface for irrigation of plants through the submersible sewage pump 12 and the drainage hose 13.

[0024] like Figure 1 As shown, the infiltration layers are, from bottom to top, a bottom gravel layer 7, a small-particle natural zeolite layer 6 and a top gravel layer 3; in this example, the bottom gravel layer 7 has a thickness h1 of 200 mm and a particle size of 20 mm, and the bottom gravel layer 7 supports the water collection perforated pipe 8 and prevents the water collection perforated pipe 8 from being blocked; the small-particle natural zeolite layer 6 has a thickness h2 of 800 mm and a particle size of 3 mm; the top gravel layer 3 has a thickness h3 of 200 mm and a particle size of 30 mm, which supports the main water inlet pipe 18 and the water inlet perforated pipe 4 and prevents the water inlet perforated pipe 4 from being blocked.

[0025] After sedimentation and deflection, the sewage enters the inlet perforated pipe 4, passes through the top gravel layer 3, and enters the small-grained natural zeolite layer 6. After filtration, ammonia removal, and nitrogen removal in the small-grained natural zeolite layer 6, it enters the bottom gravel layer 7, completing the sewage purification process. The treated water enters the double-drum II water collection tank through the water collection perforated pipe 8. The water in the water collection tank can be discharged directly to the outside of the system through the outlet valve 19 (normally open) and the main outlet pipe 5, or discharged through the submersible sewage pump 12 and drainage hose 13 located in the Zone II water collection tank for plant irrigation.

[0026] The double-layer cylinder 16 is a carbon steel structure and is divided into two areas by an outer cylinder wall 22 and an inner cylinder wall 23. The annular space formed by the outer cylinder wall 22 and the inner cylinder wall 23 is the zone I regulating sedimentation tank, and the internal space of the inner cylinder wall 23 is the zone II water collection tank. The volume ratio of the zone I regulating sedimentation tank to the zone II water collection tank is 1:1.3~1.5, and the volume ratio in this case is 1:1.3; the height difference between the inner and outer cylinder walls 23 and 22 is 150mm.

[0027] The main water inlet pipe interface and the main water outlet pipe connection arranged on the periphery of the inner cylinder wall 23, and the water inlet perforated pipe interface and the water collecting perforated pipe connection arranged on the periphery of the outer cylinder wall 22 are all provided with connection flanges. The connection flanges and the connecting flanges arranged at the ends of the main water inlet pipe 18, the main water outlet pipe 5, the water inlet perforated pipe 4 or the water collecting perforated pipe 8 connected thereto are connected by bolts and nuts 15. The prefabricated connection pipes and the flange connection can ensure that each water inlet perforated pipe 4 or the water collecting perforated pipe 8 is located at the same height, thereby ensuring installation accuracy.

[0028] like Figure 3 、 Figure 4 As shown, the main water inlet pipe 18 and multiple water inlet perforated pipes 4 are all placed in the top gravel layer 3 of the infiltration layer, and the water collecting perforated pipe 8 is placed in the bottom gravel layer 7 of the infiltration layer; the main water outlet pipe 5 is placed near the top of the small-particle natural zeolite layer 6, and the multiple water permeable holes arranged on the lower end faces of the water collecting perforated pipe 8 and the water inlet perforated pipe 4 have an angle β of 45 degrees between their axes and the vertical line downward, and are cross-arranged, and water is used for outlet or inlet through the water permeable holes.

[0029] In this example, the bottom support layer 9 is a fine sand layer with a thickness H1 of 100 mm, specifically 100 mm in this example, protecting the impermeable membrane 11. The soil layer 19 has a thickness H2 of 300-1200 mm, specifically 300 mm in this example. The manhole pipe 2 is eccentrically arranged relative to the double-layer tube, with an eccentric distance W of 150 mm. Due to the limited space available for underground equipment, this eccentric arrangement facilitates the movement of the water pump and hose between Zones I and II.

[0030] A drainage hose 13 is connected to the submersible sewage pump 12, and a hose valve 20 (normally open) is provided on the drainage hose 13. When the submersible sewage pump 12 is placed in the water collection tank of zone II of the double-layer cylinder 16, the water outlet end of the drainage hose 13 extends out of the manhole cover 1 and is discharged to the surface for irrigation; or the drainage hose 13 extends into the regulating sedimentation tank of zone I for forward washing; or the submersible sewage pump 12 is placed in the regulating sedimentation tank of zone I, and the water outlet end of the drainage hose 13 extends out of the manhole cover 1 to discharge water outside the system for backwashing.

[0031] The construction method of the infiltration system of the present invention is as follows:

[0032] S1: Connect the water inlet perforated pipe 4 and the water collection perforated pipe 8 to the double-layer cylinder;

[0033] S2: excavation of cylindrical earthwork;

[0034] S3: Laying an anti-seepage membrane 11 in the earth excavated in step S2;

[0035] S4: Laying a bottom supporting layer 9 on the bottom of the anti-seepage membrane 11. The bottom supporting layer 9 is made of fine sand to protect the anti-seepage membrane 11.

[0036] S5: Lay a bottom gravel layer 7 on the bottom supporting layer 9, with a thickness of 1 / 2 of the thickness of the entire bottom gravel layer 7, and place a double-layer cylinder on the bottom gravel layer 7. Connect the main water inlet pipe 18 and the main water outlet pipe 5 to the double-layer cylinder, and lay another bottom gravel layer 7 on the outer periphery of the outer cylinder wall 22;

[0037] S6: Laying a small-grain natural zeolite layer 6 on the outer periphery of the outer cylinder wall 22 above the bottom gravel layer 7;

[0038] S7: Laying a top gravel layer 3 on the outer periphery of the outer cylinder wall 22 above the small-particle natural zeolite layer 6, so that the top gravel layer 3 is flush with the outer cylinder wall 22;

[0039] S8: A manhole pipe 2 is placed on the interface extending from the end of the outer cylinder wall 22, and a manhole cover 1 is installed on the end extending from the surface. A soil layer 21 is laid above the top gravel layer 3 on the outer periphery of the manhole pipe 2. The thickness of the soil layer 21 is adjusted according to the thickness of the frozen soil layer at the construction site.

[0040] In the present invention, a drainage hose 13 is connected to the submersible sewage pump 12, and a hose valve 20 is provided on the drainage hose 13. The submersible sewage pump 12 is placed in the water collection tank of zone II of the double-layer cylinder 16. When the submersible sewage pump is working, the water outlet end of the drainage hose 13 extends out of the manhole cover 1 and is discharged to the surface for irrigation; or the drainage hose 13 extends into the regulating sedimentation tank of zone I, and water is discharged into the regulating sedimentation tank of zone I, and the system is forward washed; or the submersible sewage pump 12 is placed in the regulating sedimentation tank of zone I, and the water outlet end of the drainage hose 13 extends out of the manhole cover 1 to discharge water outside the system, and clean water is injected into the water collection tank of zone II, and the system is backwashed.

[0041] The method for performing positive washing of the system is as follows:

[0042] The main water inlet pipe 18 stops accepting sewage, and the drain hose extends into the Zone I regulating sedimentation tank. Submersible sewage pump 12 and drain hose 13 pump purified water from the Zone II sump to the Zone I regulating sedimentation tank. Water in the regulating sedimentation tank flows through water distribution pipe 17, out of the permeable holes of the water inlet perforated pipe 4, through the percolation layer, into the perforated water collection pipe 8, and back to the Zone II sump. The forward wash flushes scum, sludge, and other impurities intercepted by the percolation layer during the sewage purification process into the Zone II sump. After the forward wash is complete, the sewage from the Zone II sump is discharged from the system using the submersible sewage pump 12 and drain hose 13. A hose valve 20 on the drain hose 13 is used to adjust the water output of the submersible sewage pump 13. This system does not require external water replenishment; the forward wash completes the top-down flushing of the percolation system.

[0043] The system performs backwashing as follows:

[0044] Stop the flow of sewage into the main inlet pipe 18, close the outlet valve 19 connected to the main outlet pipe 5, place the submersible sewage pump 12 and drain hose 13 in the Zone I regulating sedimentation tank, open the manhole cover 1, and extend the outlet end of the drain hose 13 out of the manhole cover 1, pumping water from the Zone I regulating sedimentation tank to the outside of the system. Simultaneously, clean water is injected into the Zone II sump through the manhole pipe 2. The clean water and purified water in the sump enter the percolation layer through the permeable holes of the water collection perforated pipe, and then enter the Zone I regulating sedimentation tank through the permeable holes of the water inlet perforated pipe 4. The water is then pumped out of the system by the submersible sewage pump 12 and drain hose 13. During backwashing, the hose valve controls the water output of the submersible sewage pump 12 to maintain a balance with the amount of clean water entering the sump. Backwashing flushes scum, sludge, and other debris intercepted by the percolation layer during the sewage purification process into the Zone I regulating sedimentation tank, completing the flushing of the percolation system from bottom to top. The hose valve 20 provided on the drainage hose 13 is used to adjust the water output of the submersible sewage pump 13 to ensure that the water output is equivalent to the backwash water inlet.

[0045] The method for clearing mud and sand from the system is as follows:

[0046] Stop the water inlet of the main water inlet pipe 18, place the submersible sewage pump 12 and the drainage hose 13 in the zone I regulating sedimentation tank, and use the submersible sewage pump 12 and the drainage hose 13 to discharge the mud and sand in the zone I regulating sedimentation tank to the outside of the system; to increase the mud cleaning effect, place the submersible sewage pump 13 and the drainage hose 14 in the zone II water collection tank, pump the water in the zone II water collection tank into the zone I regulating sedimentation tank, use high-pressure water to complete the cleaning of the zone I regulating sedimentation tank, and then place the submersible sewage pump 12 and the drainage hose 13 in the zone I regulating sedimentation tank to discharge the mud and sand outside the system.

[0047] Example 2: This example differs from Example 1 in that the volume ratio of the regulating sedimentation tank in Zone I to the water collection tank in Zone II of the double-layered cylinder 16 is 1:1.5; the height difference between the inner and outer cylinder walls is 250 mm, and the eccentricity W between the manhole pipe and the double-layered cylinder is 200 mm. The bottom gravel layer 7 has a thickness h1 of 300 mm and a particle size of 25 mm; the small-grained natural zeolite layer 6 has a thickness h2 of 1000 mm and a particle size of 5 mm; the top gravel layer 3 has a thickness h3 of 260 mm and a particle size of 20 mm; the bottom support layer is a fine sand layer with a thickness H1 of 120 mm; and the soil layer has a thickness H2 of 1200 mm.

[0048] Example 3: This example differs from Example 1 in that the volume ratio of the regulating sedimentation tank in Zone I to the water collection tank in Zone II of the double-layered cylinder 16 is 1:1.4; the height difference between the inner and outer cylinder walls is 200 mm; and the eccentricity W between the manhole pipe and the double-layered cylinder is 250 mm. The bottom gravel layer 7 has a thickness h1 of 250 mm and a particle size of 30 mm; the small-grained natural zeolite layer 6 has a thickness h2 of 900 mm and a particle size of 6 mm; the top gravel layer 3 has a thickness h3 of 300 mm and a particle size of 25 mm; the bottom support layer is a fine sand layer with a thickness H1 of 110 mm; and the soil layer has a thickness H2 of 800 mm.

[0049] The present invention integrates a regulating sedimentation tank and a water collection tank, providing forward washing, backwashing, and mud and sand removal functions. The entire system is fully functional, simple in structure, requires minimal floor space, and is safe and reliable. All components can be engineered and assembled on-site, shortening the construction period, reducing the difficulty, and ensuring construction quality. The entire infiltration system is placed on undisturbed soil 19, ensuring overall system stability.

[0050] The components not described in detail in this application are all existing conventional technologies and will not be described in detail here.

[0051] It can be understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that the present invention can still be modified or replaced by equivalents to achieve the same technical effects; as long as the use requirements are met, they are within the scope of protection of the present invention.

Claims

1. An assembled land infiltration purification system suitable for decentralized sewage treatment, characterized by: It includes a double-layer cylinder, a manhole pipe, a manhole cover, an impermeable membrane, a soil layer, a percolation layer and a bottom supporting layer. The impermeable membrane is arranged in the earthwork under the surface, and the bottom supporting layer, the percolation layer and the soil layer are arranged in the impermeable membrane from bottom to top. The double-layer cylinder is arranged in the percolation layer, and the top cylinder mouth extends out of the percolation layer to connect to the manhole pipe placed in the soil layer. The top of the manhole pipe extends out of the ground surface, and a manhole cover is arranged on it; a zone I regulating sedimentation tank is formed between the outer cylinder wall and the inner cylinder wall of the double-layer cylinder, and the internal space of the inner cylinder wall is a zone II water collecting tank. A total water inlet pipe interface is arranged along the upper part of the outer periphery of the outer cylinder wall, and the total water inlet pipe is connected to it; and below the total water inlet pipe interface, a plurality of water inlet perforated pipe interfaces are evenly spaced at the same height along the outer periphery of the outer cylinder wall, and the water inlet perforated pipes are respectively connected to them. The total water inlet pipe is connected to the water distribution pipe placed in the zone I regulating sedimentation tank, and a plurality of water inlet pipe interfaces are evenly spaced at the bottom periphery of the inner cylinder wall. The water collecting perforated pipe connection pipe of the wall is connected to the water collecting perforated pipe respectively, and a number of water permeable holes are set on the lower end faces of the water inlet perforated pipe and the water collecting perforated pipe; the upper part of the inner cylinder wall below the water inlet perforated pipe is connected to the main outlet pipe connection pipe, the main outlet pipe connection pipe passes through the outer cylinder wall, and is connected to the main outlet pipe, and the water inlet end of the main water inlet pipe and the water outlet end of the main outlet pipe both pass through the anti-seepage membrane; the water inlet perforated pipe and the water collecting perforated pipe are respectively arranged at uniform intervals along the circumference; the sewage enters the zone I regulating sedimentation tank of the double-layer cylinder through the main water inlet pipe and the water distribution pipe, enters the water inlet perforated pipe after sedimentation and deflection, flows out from the water permeable holes of the water inlet perforated pipe and enters the infiltration layer, and after filtration, ammonia removal and denitrification purification in the infiltration layer, enters the zone II water collecting tank through the water permeable holes on the water collecting perforated pipe, and the purified water in the water collecting tank is directly discharged to the outside of the system through the main outlet pipe, or discharged to the surface for irrigation of plants through a submersible sewage pump and a drainage hose.

2. The assembled land infiltration purification system suitable for decentralized sewage treatment according to claim 1 is characterized by: The infiltration layer is composed of a bottom gravel layer, a small-particle natural zeolite layer and a top gravel layer from bottom to top; the thickness h1 of the bottom gravel layer is 200-300 mm, the particle size is 20-30 mm, the thickness h2 of the small-particle natural zeolite layer is 800-1000 mm, the particle size is 3-6 mm, and the thickness h3 of the top gravel layer is 200-300 mm, the particle size is 20-30 mm.

3. The assembled land infiltration purification system suitable for decentralized sewage treatment according to claim 1 is characterized by: The double-layer cylinder is a carbon steel structure and is divided into two areas by an outer cylinder wall and an inner cylinder wall. The annular space formed by the outer cylinder wall and the inner cylinder wall is the zone I regulating sedimentation tank, and the internal space of the inner cylinder wall is the zone II water collection tank. The volume ratio of the zone I regulating sedimentation tank to the zone II water collection tank is 1:1.3~1.

5.

4. The assembled land infiltration purification system suitable for decentralized sewage treatment according to claim 3 is characterized by: The height difference between the inner cylinder wall and the outer cylinder wall is 150 to 250 mm.

5. The assembled land infiltration purification system suitable for decentralized sewage treatment according to claim 1 is characterized by: The outer periphery of the outer cylinder wall is provided with a total water inlet pipe interface and a water inlet perforated pipe interface, and the outer periphery of the inner cylinder wall is provided with a water collection perforated pipe interface and a total water outlet interface. The above interfaces are all provided with a connecting flange, and the connecting flange and the connecting flange provided at the end of the total water inlet pipe, water inlet perforated pipe, total water outlet pipe and water collection perforated pipe connected thereto are connected by bolts and nuts.

6. The assembled land infiltration purification system suitable for decentralized sewage treatment according to claim 1 is characterized by: The main water inlet pipe and multiple water inlet perforated pipes are all placed on the top gravel layer of the infiltration layer, the water collection perforated pipes are placed on the bottom gravel layer of the infiltration layer; the main water outlet pipe is placed on the top of the small-particle natural zeolite layer.

7. The assembled land infiltration purification system suitable for decentralized sewage treatment according to claim 1 is characterized by: The angle β between the axes of the plurality of water-permeable holes arranged on the lower end surfaces of the water-collecting perforated pipe and the water-inlet perforated pipe and the vertical line is 45 degrees, and the holes are arranged crosswise.

8. The assembled land infiltration purification system suitable for decentralized sewage treatment according to claim 1 is characterized by: The bottom supporting layer is a fine sand layer, and the thickness H1 of the fine sand layer is 100 mm; the thickness H2 of the soil layer is 300-1200 mm.

9. The assembled land infiltration purification system suitable for decentralized sewage treatment according to claim 1 is characterized by: The manhole pipe and the double-layer tube are eccentrically arranged, and the eccentric distance W is 150-250 mm.

10. The assembled land infiltration purification system suitable for decentralized sewage treatment according to claim 1, characterized in that: A drainage hose is connected to the submersible sewage pump, and a hose valve is provided on the drainage hose. When the submersible sewage pump is placed in the water collection tank of zone II of the double-layer cylinder, the water outlet end of the drainage hose extends out of the manhole cover and discharges water to the surface for irrigation; or the drainage hose extends into the regulating sedimentation tank of zone I for forward washing; or the submersible sewage pump is placed in the regulating sedimentation tank of zone I, and the water outlet end of the drainage hose extends out of the manhole cover to discharge water outside the system for backwashing.

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