Fabricated land percolation and purification system suitable for decentralized sewage treatment

Abstract

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

[0002] The 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, mainly including 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 device 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, and the amount of earth excavation is large, especially for the courtyard construction site in the north where households are used as units, and the application is limited. There is no forward washing and backwashing function, and there is a lack of effective measures to prevent the perforated pipes and the infiltration system from being blocked; usually there is no supporting mud and sand cleaning function; various pipelines need to be assembled 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 view of the above-mentioned technical problems, the present invention provides an assembled land infiltration purification system suitable for decentralized sewage treatment.

[0004] The objective 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, an infiltration layer and a bottom supporting layer. The impermeable membrane is arranged in the earthwork under the surface, and the bottom supporting layer, the infiltration 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 infiltration layer, and the top cylinder mouth extends out of the infiltration layer to be connected to the manhole pipe arranged in the soil layer. The top of the manhole pipe extends out of the surface, and the manhole cover is arranged thereon; 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 thereto; 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 thereto. The total water inlet pipe is connected to a water distribution pipe arranged in the zone I regulating sedimentation tank, and a water distribution pipe is arranged at the bottom outer periphery of the inner cylinder wall. A plurality of water collecting perforated pipe pipes passing through the outer cylinder wall are evenly arranged at intervals around the circumference, and the water collecting perforated pipes are connected to them respectively. A plurality of water permeable holes are arranged on the lower end surfaces of the water inlet perforated pipe and the water collecting perforated pipe; a total water outlet pipe pipe is connected to the upper part of the inner cylinder wall below the water inlet perforated pipe, and the total water outlet pipe pipe 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 arranged along the circumference. Evenly spaced and staggered arrangement; sewage enters the double-layer cylinder 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 permeable holes of the water inlet 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 permeable holes on the water collection 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 through a submersible sewage pump and a drainage hose to irrigate plants.

[0006] Furthermore, the infiltration layers are, from bottom to top, a bottom gravel layer, a small-particle natural zeolite layer and a top gravel layer; 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.

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

[0008] Furthermore, a main water inlet pipe interface and a water inlet perforated pipe interface are arranged on the outer periphery of the outer cylinder wall, and a water collection perforated pipe interface and a main water outlet interface are arranged from the outer periphery of the inner cylinder wall through the outer cylinder wall. A connecting flange is arranged 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 arranged 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 collecting 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 axis of the multiple water-permeable holes arranged on the lower end faces of the water collecting perforated pipe and the water inlet perforated pipe has an angle β of 45 degrees downward with the vertical line, and they are cross-arranged.

[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 300-1200 mm.

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

[0012] Furthermore, a drainage hose is connected to the submersible sewage pump, and a hose valve is arranged 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 to discharge 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.

[0013] Furthermore, the construction method of the present invention is as follows:

[0014] S1: Connect the water inlet perforated pipe and the water collection perforated pipe on the double-layer cylinder;

[0015] S2: excavation of cylindrical earth;

[0016] S3: Laying an anti-seepage membrane in the earth excavated in step S1;

[0017] S4: Lay a bottom supporting layer at the bottom of the anti-seepage membrane. The supporting layer is fine sand with a laying thickness of 100-120mm to protect the anti-seepage membrane;

[0018] S5: Lay a bottom gravel layer on the bottom supporting layer, the gravel layer thickness is 100-150mm, and place the double-layer cylinder on the bottom gravel layer, connect the main water inlet pipe and the main water outlet pipe on the double-layer cylinder, and lay a bottom gravel layer on the outer periphery of the outer cylinder wall, the gravel thickness is 100-150mm;

[0019] S6: laying a small-grain natural zeolite layer on the outer periphery of the outer cylinder wall above the bottom gravel layer, the thickness of the small-grain natural zeolite layer is 800-1000 mm;

[0020] S7: Lay a top gravel layer on the outer periphery of the outer cylinder wall above the small-grain natural zeolite layer, so that the top gravel layer is flush with the outer cylinder wall;

[0021] S8: A manhole pipe is placed on the interface extending from the end of the outer cylinder wall, and a manhole cover is installed on the end extending from the ground surface. A soil layer is laid above the top gravel layer on the outer periphery of the manhole pipe. The thickness of the soil layer is adjusted according to the thickness of the frozen soil layer at the construction site, and the thickness ranges from 300 to 1200 mm.

[0022] Furthermore, a drainage hose is connected to the submersible sewage pump, and a hose valve is arranged on the drainage hose. The submersible sewage pump is placed in the water collection tank of zone II. When the submersible sewage pump is working, the drainage hose is extended from the manhole cover to drain water to the surface for irrigation; or the drainage hose is extended into the regulating sedimentation tank of zone I, and the water is discharged into the regulating sedimentation tank of zone I, and the system is forward washed; or the submersible sewage pump is placed in the regulating sedimentation tank of zone I, and the drainage hose is extended from the manhole cover to drain water outside the system, and clean water is injected into the water collection tank of zone II, and the system is backwashed;

[0023] The method for performing positive washing of the system is as follows:

[0024] The main water inlet pipe stops taking in sewage, and the drainage hose extends into the regulating sedimentation tank of Zone I. The purified water is pumped from the water collection tank of Zone II to the regulating sedimentation tank of Zone I by a submersible sewage pump and drainage hose. The water in the regulating sedimentation tank flows out from the water permeable holes of the water inlet perforated pipe through the water distribution pipe, passes through the infiltration layer, enters the water collection perforated pipe, and returns to the water collection tank of Zone II. The scum and sludge intercepted by the infiltration layer during the sewage purification process are flushed into the water collection tank of Zone II by the positive wash. After the positive wash is completed, the sewage from the water collection tank of Zone II is discharged outside the system by a submersible sewage pump and drainage hose, completing the flushing of the infiltration system from top to bottom.

[0025] The system performs backwashing as follows:

[0026] Stop the sewage from entering the main water inlet pipe, close the outlet valve connected to the main water outlet pipe, place the submersible sewage pump and drainage hose in the zone I regulating sedimentation tank, open the manhole cover, extend the drainage hose out of the system, and inject clean water into the zone II water collection tank through the manhole pipe. The clean water and the purified water in the water collection tank enter the infiltration layer through the water permeable holes of the water collection perforated pipe, and enter the zone I regulating sedimentation tank from the water inlet perforated pipe. The water is pumped out by the submersible sewage pump and the drainage hose and discharged to the outside of the system. During the backwashing process, the hose valve is adjusted to control the water output of the submersible sewage pump to maintain a balance with the amount of clean water entering the water collection tank. Backwashing flushes the scum and sludge intercepted by the infiltration layer during the sewage purification process to the zone I regulating sedimentation tank, completing the flushing of the infiltration system from bottom to top.

[0027] The system mud and sand removal methods are as follows:

[0028] Stop the water inlet, place the submersible sewage pump and drainage hose in the zone I regulating sedimentation tank, and use the submersible sewage pump and drainage hose to discharge the mud and sand in the zone I regulating sedimentation tank to the outside of the system. To increase the mud removal effect, you can also use the submersible sewage pump and drainage hose to put it 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 clean the zone I regulating sedimentation tank, and then place the submersible sewage pump and drainage hose in the zone I regulating sedimentation tank to discharge the mud and sand outside the system.

[0029] The beneficial effects of the present invention are:

[0030] 1. The present invention is aimed at the soil infiltration system for rural domestic sewage treatment in the north, which is based on households. The characteristics of rural sewage in the north, which is based on households, are small water volume; unstable water volume, intermittent drainage; construction in the courtyard, limited working space; no professional operators, and suitable for simple operation and maintenance, safe and reliable facilities.

[0031] 2. The double-layer cylinder of the present invention integrates the regulating sedimentation tank, the water collection tank, the water inlet perforated pipe and the water collection perforated pipe, which are manufactured in the factory and assembled on site. The system has a small construction area and a small amount of earth excavation; the construction is simple, shortening the construction time and saving construction costs; the installation dimensions are completed by the factory to ensure the construction quality; the structure is simple and the operation is safe and reliable.

[0032] 3. The present invention has the functions of forward washing, backwashing and cleaning mud and sand, which effectively prevents the system from being blocked, and the system can be used for a longer and more stable time. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a cross-sectional structural schematic diagram of the present invention.

[0034] Figure 2 for Figure 1 AA direction top view.

[0035] Figure 3 This is the layout diagram of the water inlet perforated pipe and the water collection perforated pipe and permeable pipe.

[0036] Figure 4 for Figure 3 Schematic diagram of direction B.

[0037] 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 outlet valve; 20 hose valve; 21 soil layer; 22 inner cylinder wall; 23 inner cylinder wall. DETAILED DESCRIPTION

[0038] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0039] Example 1: Figure 1 , Figure 2 As shown, the present invention is an assembled land 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, an infiltration layer and a bottom support layer 9. The impermeable membrane 11 is arranged on the original soil 10 in the earthwork under the surface and on the inner periphery of the earthwork. The bottom support layer 9, the infiltration layer and the soil layer 21 are arranged in sequence from bottom to top at the bottom of the impermeable membrane 11. The double-layer cylinder 16 is arranged in the infiltration layer, and the top cylinder mouth extends out of the infiltration layer to connect to the manhole placed in the soil layer 21. The top of the manhole pipe 2 extends out of the ground, and a manhole cover 1 is arranged 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 collecting tank. A total water inlet pipe interface is arranged along the upper part of the outer circumference 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 arranged at the same height along the outer circumference of the outer cylinder, and the water inlet perforated pipes 4 are connected to them respectively, and the total water inlet pipe 18 is connected to the water distribution pipe 17 placed in the outer cylinder, and the total water inlet pipe 18 is connected to the water distribution pipe 17 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 pipe connecting pipes that pass through the outer cylinder, and the water collecting perforated pipes 8 are connected to them respectively. 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 main water outlet pipe connecting pipe is evenly spaced and connected to the outer periphery of the upper part of the inner cylinder wall below the water inlet perforated pipe 4. The main water outlet pipe connecting pipe passes through the inner cylinder wall 22 and is connected to the main water outlet pipe 5. The water inlet end of the main water inlet pipe 18 and the water outlet end of the main 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 arranged at even intervals and staggered along the circumference; the sewage enters the zone I regulating sedimentation tank of the double-layer cylinder 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 permeable holes of the water inlet perforated pipe 4 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 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 water outlet pipe 5, or discharged to the surface for irrigating plants through the submersible sewage pump 12 and the drainage hose 13.

[0040] 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, and plays a role in supporting the main water inlet pipe 18 and the water inlet perforated pipe 4 and preventing the water inlet perforated pipe 4 from being blocked.

[0041] After sedimentation and deflection, the sewage enters the water 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 to complete the sewage purification treatment. The treated water enters the double-layer cylinder II zone water collection tank through the water collection perforated pipe 8. The water in the water collection tank can be directly discharged to the outside of the system through the water outlet valve 19 (normally open) and the main water outlet pipe 5, or discharged through the submersible sewage pump 12 and drainage hose 13 placed in the II zone water collection tank for plant irrigation.

[0042] The double-layer cylinder 16 is a carbon steel structure and is divided into two areas by an inner 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 collecting tank. The volume ratio of the zone I regulating sedimentation tank to the zone II water collecting tank is 1:1.3-1.5, and the volume ratio in this example is 1:1.3; the height difference between the inner and outer cylinder walls 23 and 22 is 150 mm.

[0043] The main water inlet pipe interface and the main water outlet pipe connection arranged on the outer periphery of the inner cylinder wall 23, and the water inlet perforated pipe interface and the water collecting perforated pipe connection arranged on the outer periphery of the outer cylinder wall 22 are all provided with connection flanges, and the connection 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 connection flanges are prefabricated and connected by flanges, which can ensure that each water inlet perforated pipe 4 or water collecting perforated pipe 8 is located at the same height, thereby ensuring installation accuracy.

[0044] like Figure 3 , Figure 4 As shown, the main water inlet pipe 18 and multiple water inlet perforated pipes 4 are placed on the top gravel layer 3 of the infiltration layer, and the water collecting perforated pipe 8 is placed on 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 axis of a plurality of water-permeable holes arranged on the lower end faces of the water collecting perforated pipe 8 and the water inlet perforated pipe 4 has an angle β of 45 degrees downward with the vertical line, and they are cross-arranged, and water is discharged or inhaled through the water-permeable holes.

[0045] The bottom supporting layer 9 in this example is a fine sand layer, and the thickness H1 of the fine sand layer is 100 mm, which is 100 mm in this example, and is used to protect the anti-seepage membrane 11. The thickness H2 of the soil layer 19 is 300 mm-1200 mm, which is 300 mm in this example. The manhole pipe 2 and the double-layer tube are eccentrically arranged, and the eccentric distance W is 150 mm; due to the small space of the buried equipment, the eccentric setting is to facilitate the water pump and the hose to move back and forth between area I and area II.

[0046] A drainage hose 13 is connected to the submersible sewage pump 12, and a hose valve 20 (normally open) is arranged 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 to discharge water 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.

[0047] The construction method of the infiltration system of the present invention is as follows:

[0048] S1: Connect the water inlet perforated pipe 4 and the water collection perforated pipe 8 to the double-layer cylinder;

[0049] S2: excavation of cylindrical earth;

[0050] S3: Laying an anti-seepage membrane 11 in the earth excavated in step S2;

[0051] S4: Laying a bottom supporting layer 9 at the bottom of the anti-seepage membrane 11, wherein the bottom supporting layer 9 is fine sand to protect the anti-seepage membrane 11;

[0052] S5: Lay a bottom gravel layer 7 on the bottom supporting layer 9, the thickness of which is 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 the bottom gravel layer 7 on the outer periphery of the outer cylinder wall 22;

[0053] 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;

[0054] S7: Lay 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;

[0055] S8: A manhole pipe 2 is sleeved 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, and 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.

[0056] In the present invention, a drainage hose 13 is connected to the submersible sewage pump 12, and a hose valve 20 is arranged 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 the water is discharged to the surface for irrigation; or the drainage hose 13 extends into the regulating sedimentation tank of zone I, and the 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.

[0057] The method for performing positive washing of the system is as follows:

[0058] The main water inlet pipe 18 stops taking in sewage, and the drainage hose extends into the regulating sedimentation tank of zone I. The submersible sewage pump 12 and drainage hose 13 are used to pump the purified water from the water collection tank of zone II to the regulating sedimentation tank of zone I. The water in the regulating sedimentation tank flows out from the water permeable holes of the water inlet perforated pipe 4 through the water distribution pipe 17, passes through the percolation layer, enters the water collection perforated pipe 8, and returns to the water collection tank of zone II. The positive wash flushes the scum, sludge and other impurities intercepted by the percolation layer during the sewage purification process to the water collection tank of zone II. After the positive wash is completed, the sewage from the water collection tank of zone II is discharged to the outside of the system by the submersible sewage pump 12 and drainage hose 13. The hose valve 20 set on the drainage hose 13 is used to adjust the water output of the submersible sewage pump 13. This system does not require external water replenishment, and the positive wash completes the flushing of the percolation system from top to bottom.

[0059] The system performs backwashing as follows:

[0060] The main water inlet pipe 18 stops taking in sewage, closes the outlet valve 19 connected to the main water outlet pipe 5, places the submersible sewage pump 12 and the drainage hose 13 in the zone I regulating sedimentation tank, opens the manhole cover 1, and the outlet end of the drainage hose 13 extends out of the manhole cover 1, pumping water from the zone I regulating sedimentation tank to the outside of the system, and injecting clean water into the zone II water collection tank through the manhole pipe 2. The clean water and the purified water in the water collection tank enter the percolation layer through the permeable holes of the water collection perforated pipe, and enter the zone I regulating sedimentation tank from the permeable holes of the water inlet perforated pipe 4, and are pumped out by the submersible sewage pump 12 and the drainage hose 13 to the outside of the system. During the backwashing process, the regulating hose valve controls the water output of the submersible sewage pump 12 to keep the balance with the clean water entering the water collection tank. Backwashing flushes the scum, sludge, etc. intercepted by the percolation layer during the sewage purification process to the zone I regulating sedimentation tank, and backwashing completes 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.

[0061] The system mud and sand removal methods are as follows:

[0062] 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 removal effect, put the submersible sewage pump 13 and the drainage hose 14 into 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 clean 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 to the outside of the system.

[0063] Example 2: This example is different from Example 1 in that the volume ratio of the regulating sedimentation tank in zone I and the water collection tank in zone II of the double-layer cylinder 16 in this example is 1:1.5; the height difference between the inner and outer cylinder walls is 250mm, and the eccentricity W between the manhole pipe and the double-layer cylinder is 200mm. The thickness h1 of the bottom gravel layer 7 is 300mm, the particle size is 25mm, the thickness h2 of the small-particle natural zeolite layer 6 is 1000mm, and the particle size is 5mm; the thickness h3 of the top gravel layer 3 is 260mm, and the particle size is 20mm; the bottom supporting layer is a fine sand layer, the thickness H1 is 120mm; the thickness H2 of the soil layer is 1200mm.

[0064] Embodiment 3: This embodiment is different from Embodiment 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-layer cylinder 16 in this embodiment is 1:1.4; the height difference between the inner and outer cylinder walls is 200mm, and the eccentric distance W between the manhole pipe and the double-layer cylinder is 250mm. The thickness h1 of the bottom gravel layer 7 is 250mm, the particle size is 30mm, the thickness h2 of the small-particle natural zeolite layer 6 is 900mm, and the particle size is 6mm; the thickness h3 of the top gravel layer 3 is 300mm, and the particle size is 25mm; the bottom supporting layer is a fine sand layer, the thickness H1 is 110mm; the thickness H2 of the soil layer is 800mm.

[0065] The present invention integrates a regulating sedimentation tank and a water collection tank, and has the functions of forward washing, backwashing, and cleaning mud and sand. The whole system has complete functions, simple structure, small footprint, and is safe and reliable. All components can be engineered and assembled on site, which shortens the construction period, reduces the construction difficulty, and ensures the construction quality. The whole set of infiltration system is placed on the original soil 19 to ensure the stability of the whole system.

[0066] The components not described in detail in this application are all existing conventional technologies and will not be described in detail here.

[0067] 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 protection scope of the present invention.

Claims

1. An assembled land infiltration purification system suitable for decentralized sewage treatment, characterized by: It comprises a double-layer cylinder, a manhole pipe, a manhole cover, an impermeable membrane, a soil layer, a percolation layer and a bottom supporting layer. An impermeable membrane is arranged in the earthwork under the surface, and a bottom supporting layer, a percolation layer and a soil layer are arranged in the impermeable membrane in sequence 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 be connected to the manhole pipe placed in the soil layer. The top of the manhole pipe extends out of the surface, and a manhole cover is arranged thereon. 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 thereto. Moreover, 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 thereto. 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 perforated pipe interfaces penetrating the outer cylinder wall are evenly spaced at the outer periphery of the bottom of the inner cylinder wall. The water collecting perforated pipe connection pipe of the wall is connected to the water collecting perforated pipes respectively, and a plurality of water permeable holes are arranged on the lower end surfaces of the water inlet perforated pipe and the water collecting perforated pipe; the main water outlet pipe connection pipe is connected to the upper part of the inner cylinder wall below the water inlet perforated pipe, the main water outlet pipe connection pipe passes through the outer cylinder wall, and the main water outlet pipe is connected to it, and the water inlet end of the main water inlet pipe and the water outlet end of the main water 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 water outlet pipe, or is discharged to the surface for irrigating 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 layers are, from bottom to top, a bottom gravel layer, a small-particle natural zeolite layer and a top gravel layer; the bottom gravel layer has a thickness h1 of 200-300 mm and a particle size of 20-30 mm, a small-particle natural zeolite layer has a thickness h2 of 800-1000 mm and a particle size of 3-6 mm, and a top gravel layer has a thickness h3 of 200-300 mm and a particle size of 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 the inner cylinder wall and the outer 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 collecting tank. The volume ratio of the zone I regulating sedimentation tank to the zone II water collecting tank is 1:1.3~1.5; the height difference between the inner and outer cylinder walls is 150~250mm.

4. The assembled land infiltration purification system suitable for decentralized sewage treatment according to claim 1 is characterized by: A total water inlet pipe interface and a water inlet perforated pipe interface are arranged on the outer periphery of the outer cylinder wall, and a water collection perforated pipe interface and a total water outlet interface are arranged through the outer periphery of the inner cylinder wall and through the outer cylinder wall. A connecting flange is arranged on the above interfaces, and the connecting flange is connected to the connecting flanges arranged on the ends of the total water inlet pipe, water inlet perforated pipe, total water outlet pipe and water collection perforated pipe connected thereto through bolts and nuts.

5. 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 placed in the top gravel layer of the infiltration layer, and the water collecting 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 axes of the multiple 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 they are arranged crosswise.

6. 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.

7. 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.

8. The assembled land infiltration purification system suitable for decentralized sewage treatment according to claim 1 is characterized by: A drainage hose is connected to the submersible sewage pump, and a hose valve is arranged 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 to discharge 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.

9. The assembled land infiltration purification system suitable for decentralized sewage treatment according to claim 1 is characterized by: The construction method is as follows: S1: Connect the water inlet perforated pipe and the water collection perforated pipe on the double-layer cylinder; S2: excavation of cylindrical earth; S3: Laying an anti-seepage membrane in the earth excavated in step S1; S4: Lay a bottom supporting layer at the bottom of the anti-seepage membrane. The supporting layer is fine sand with a laying thickness of 100-120mm to protect the anti-seepage membrane; S5: Lay a bottom gravel layer on the bottom supporting layer, the gravel layer thickness is 100-150mm, and place the double-layer cylinder on the bottom gravel layer, connect the main water inlet pipe and the main water outlet pipe on the double-layer cylinder, and lay a bottom gravel layer on the outer periphery of the outer cylinder wall, the gravel thickness is 100-150mm; S6: laying a small-grain natural zeolite layer on the outer periphery of the outer cylinder wall above the bottom gravel layer, the thickness of the small-grain natural zeolite layer is 800-1000 mm; S7: Lay a top gravel layer on the outer periphery of the outer cylinder wall above the small-grain natural zeolite layer, so that the top gravel layer is flush with the outer cylinder wall; S8: A manhole pipe is placed on the interface extending from the end of the outer cylinder wall, and a manhole cover is installed on the end extending from the ground surface. A soil layer is laid above the top gravel layer on the outer periphery of the manhole pipe. The thickness of the soil layer is adjusted according to the thickness of the frozen soil layer at the construction site, and the thickness ranges from 300 to 1200 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 arranged on the drainage hose. The submersible sewage pump is placed in the water collection tank of zone II. When the submersible sewage pump is working, the drainage hose is extended from the manhole cover to drain water to the surface for irrigation; or the drainage hose is extended into the regulating sedimentation tank of zone I, and the water is discharged into the regulating sedimentation tank of zone I, and the system is forward washed; or the submersible sewage pump is placed in the regulating sedimentation tank of zone I, and the drainage hose is extended from the manhole cover to drain water outside the system, and clean water is injected into the water collection tank of zone II, and the system is backwashed; The method for performing positive washing of the system is as follows: The main water inlet pipe stops taking in sewage, and the drainage hose extends into the regulating sedimentation tank of Zone I. The purified water is pumped from the water collection tank of Zone II to the regulating sedimentation tank of Zone I by a submersible sewage pump and drainage hose. The water in the regulating sedimentation tank flows out from the water permeable holes of the water inlet perforated pipe through the water distribution pipe, passes through the infiltration layer, enters the water collection perforated pipe, and returns to the water collection tank of Zone II. The scum and sludge intercepted by the infiltration layer during the sewage purification process are flushed into the water collection tank of Zone II by the positive wash. After the positive wash is completed, the sewage from the water collection tank of Zone II is discharged outside the system by a submersible sewage pump and drainage hose, completing the flushing of the infiltration system from top to bottom. The system performs backwashing as follows: Stop the sewage from entering the main water inlet pipe, close the outlet valve connected to the main water outlet pipe, place the submersible sewage pump and drainage hose in the zone I regulating sedimentation tank, open the manhole cover, extend the drainage hose out of the system, and inject clean water into the zone II water collection tank through the manhole pipe. The clean water and the purified water in the water collection tank enter the infiltration layer through the water permeable holes of the water collection perforated pipe, and enter the zone I regulating sedimentation tank from the water inlet perforated pipe. The water is pumped out by the submersible sewage pump and the drainage hose and discharged to the outside of the system. During the backwashing process, the hose valve is adjusted to control the water output of the submersible sewage pump to maintain a balance with the amount of clean water entering the water collection tank. Backwashing flushes the scum and sludge intercepted by the infiltration layer during the sewage purification process to the zone I regulating sedimentation tank, completing the flushing of the infiltration system from bottom to top. The system mud and sand removal methods are as follows: Stop the water inlet, place the submersible sewage pump and drainage hose in the zone I regulating sedimentation tank, and use the submersible sewage pump and drainage hose to discharge the mud and sand in the zone I regulating sedimentation tank to the outside of the system. To increase the mud removal effect, you can also use the submersible sewage pump and drainage hose to put it 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 clean the zone I regulating sedimentation tank, and then place the submersible sewage pump and drainage hose in the zone I regulating sedimentation tank to discharge the mud and sand outside the system.

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