A system for the treatment and reuse of domestic sewage in courtyards

Abstract

This utility model discloses a system for the treatment and recycling of domestic sewage in courtyards, relating to the field of environmental protection technology. It includes a three-compartment septic tank, a leachate tank, a multi-stage composite packing infiltration system, a water storage tank, a water distribution tank, and a rhizosphere water distribution system, connected in sequence. The multi-stage composite packing infiltration system comprises multiple layers of composite packing material and a surface planting layer. Each composite packing layer is composed of multiple modular structures. Each modular structure includes a box, with handle holes on its side walls. The distance between the handle hole and the top of the box is less than the thickness of the boss. Adjacent boxes on the same layer are fixedly connected by plugs. The thickness of the plugs is greater than the thickness of one handle hole but less than the thickness of two handle holes. The leachate tank is located on the ground. The modular structure of this utility model, through the handle hole and plug design, ensures horizontal connection stability. By adding a leachate tank, the discharge pressure of the sewage pump is reduced, ensuring the normal operation of the sewage pump.

Description

Technical Field

[0001] This utility model relates to the field of environmental protection technology, and in particular to a system for the treatment and recycling of domestic sewage in courtyards. Background Technology

[0002] The courtyard sewage disposal system is an essential technology for the treatment and utilization of domestic sewage in rural areas.

[0003] Chinese patent CN119390267A discloses a recessed, nested system for the treatment and reuse of domestic sewage in courtyards. This system includes a three-compartment septic tank, a multi-stage composite packing infiltration system, a storage tank, a distribution tank, and a rhizosphere water distribution system, all connected sequentially. The multi-stage composite packing infiltration system employs a modular design and a recessed, nested structure, requiring no daily maintenance. Functional module layers are replaced periodically based on the packing material's lifespan, eliminating the need for professional technical personnel for management and maintenance, thus saving on future maintenance costs. However, the modular structure of this patent only ensures the stability of the vertical connections, not the horizontal connections. Furthermore, the suction pump in the three-compartment septic tank is directly connected to the top composite packing layer, increasing drainage resistance and causing the pump to operate under overload, making it prone to malfunction. Utility Model Content

[0004] The main purpose of this utility model is to provide a system for the disposal and recycling of domestic sewage in courtyards to solve the above-mentioned problems.

[0005] To achieve the above objectives, this utility model provides a system for the treatment and recycling of domestic sewage in courtyards, comprising a three-compartment septic tank, a leachate tank, a multi-stage composite filler infiltration system, a water storage tank, a water distribution tank, and a rhizosphere water distribution system connected in sequence. The multi-stage composite filler infiltration system includes a pit located on the ground, multiple layers of composite filler material arranged within the pit, and a surface planting layer on top of the multiple layers of composite filler material. Each layer of composite filler material is composed of multiple modular structures. Each modular structure includes a box with an opening at the top, containing corresponding filler material. The bottom of the box has a protrusion matching the opening of the box. The bottom and side walls of the box are provided with drainage holes. Each side wall of the box has a handle hole. The distance between the handle hole and the top of the box is less than the thickness of the protrusion. Adjacent boxes on the same layer are fixedly connected by a plug. The shape of the plug is the same as the shape of the handle hole, and the thickness of the plug is greater than the thickness of one handle hole but less than the thickness of two handle holes. The building's sewage pipe is connected to the three-compartment septic tank, and the leachate tank is located on the ground.

[0006] Furthermore, the three-compartment septic tank is equipped with a suction pump, the outlet of which is connected to the top of the leachate tank via a first outlet pipe; the bottom of the leachate tank is connected to the top layer of composite packing material via a leachate pipe; one side of the bottom layer of composite packing material is connected to a water storage tank via a second outlet pipe; the water storage tank is equipped with a suction pump, the outlet of which is connected to a distribution tank via a third outlet pipe; the distribution tank is equipped with a distribution pump, the outlet of which is connected to a rhizosphere water distribution system via a fourth outlet pipe; the rhizosphere water distribution system is located above the surface planting layer.

[0007] Furthermore, the multi-layer composite filler consists of, from bottom to top, a composite sand layer, a porous ceramsite filler layer, a straw activated biochar filler layer, a mature cow dung filler layer, and a charcoal-fired coarse sand filter layer.

[0008] Furthermore, the filler in the carbonized coarse sand filter media layer is coarse sand that has been carbonized at 600-1000 degrees Celsius.

[0009] Furthermore, the seepage tank is equipped with multi-stage replaceable filters.

[0010] Furthermore, the rhizosphere water distribution system includes a pipe body and multiple nozzles mounted on the pipe body, and the pipe body is detachably connected to the fourth water outlet pipe.

[0011] Furthermore, the box body is made of PVC material.

[0012] This utility model has the following beneficial effects:

[0013] The modular structure of this utility model ensures horizontal connection stability through the design of handle holes and plugs; by adding a seepage tank, the drainage pressure of the sludge pump in the three-compartment septic tank is reduced, ensuring the normal operation of the sludge pump; at the same time, a multi-stage filter screen is set to avoid clogging of the downstream multi-stage composite packing filtration system. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall system for the courtyard disposal and resource reuse of domestic sewage according to this utility model.

[0015] Figure 2 This is a top view of the modular structure of a domestic sewage courtyard disposal and resource reuse system according to this utility model.

[0016] Figure 3 This is a modular structural cross-sectional view of a domestic sewage courtyard disposal and resource reuse system according to this utility model.

[0017] Figure 4 This is a partial cross-sectional view of the modular structure connection state of a domestic sewage courtyard disposal and resource recycling system according to this utility model.

[0018] Among them, 1-house; 2-sewage pipe; 3-three-compartment septic tank; 4-sewage pump; 5-first outlet pipe; 6-pit; 7-composite sand layer; 8-porous ceramsite filler layer; 9-straw activated biochar filler layer; 10-matured cow dung filler layer; 11-charcoal-fired coarse sand filter layer; 12-surface planting layer; 13-second outlet pipe; 14-water storage tank; 15-sewage pump; 16-third outlet pipe; 17-water distribution tank; 18-water distribution pump; 19-fourth outlet pipe; 20-rhizosphere water distribution system; 21-leakage pipe; 22-leakage tank; 31-box body; 32-filler; 33-protrusion; 34-leakage hole; 35-handle hole; 36-hole plug. Detailed Implementation

[0019] To achieve the above objectives and effects, the technical means and structure adopted by this utility model are described in detail with reference to the accompanying drawings, focusing on the features and functions of the preferred embodiments of this utility model.

[0020] like Figure 1-4As shown, this utility model provides a system for the treatment and recycling of domestic sewage in courtyards, including a three-compartment septic tank 3, a leachate tank 22, a multi-stage composite packing filtration system, a water storage tank 14, a water distribution tank 17, and a root zone water distribution system 20 connected in sequence. The three-compartment septic tank is mainly used for the pretreatment of domestic sewage. The leachate tank 22 is used to reduce the discharge pressure of the suction pump 4 in the three-compartment septic tank 3. The leachate tank 22 is equipped with multi-stage replaceable filters to filter the effluent from the three-compartment septic tank 3, preventing blockage of the downstream multi-stage composite packing filtration system. The leachate tank 22 is located on the ground, and the liquid in the leachate tank 22 gradually seeps into the multi-stage composite packing filtration system under the action of gravity. The multi-stage composite packing filtration system is used for the purification of domestic sewage. The water storage tank 14 is mainly used to store the leachate from the multi-stage composite packing filtration system. The filtration system outputs water, monitors the water quality, and uses a suction pump 15 to pump the water to a distribution tank 17 in a timed and quantitative manner. The distribution tank 17 is mainly used for the reuse and distribution of the purified water from the system. According to the growth needs of the planted crops, the water is pumped to the rhizosphere water distribution system 20 by a distribution pump 18. The rhizosphere water distribution system 20 is mainly used for the quantitative transportation and distribution of water reused to the surface planting layer 12. The multi-stage composite packing infiltration system includes a pit 6 located on the ground, a multi-layer composite packing layer set in the pit 6, and a surface planting layer 12 set on top of the multi-layer composite packing layer. Each composite packing layer is composed of multiple modular structures spliced ​​together. According to the user's sewage generation, purification requirements, and courtyard area, they can be freely combined and matched without daily maintenance. The composite packing layer can be replaced periodically according to the packing life. The modular structure includes a box 31 with an opening at the top, made of PVC material. The box 31 contains corresponding filler 32. A boss 33 matching the opening is located at the bottom of the box 31. Drainage holes 34 are provided on the bottom and side walls of the box 31. Handle holes 35 are provided on the side walls of the box 31 for easy handling. The distance between the handle hole 35 and the top of the box 31 is less than the thickness of the boss 33. This ensures that the filler 32 is not affected during installation, and that the boss 33 of the upper box 31 can seal the handle hole 35 of the lower box 31 during concave-sleeve installation, preventing leakage. Adjacent boxes 31 on the same layer are fixedly connected by plugs 36. The plugs have the same shape as the handle holes, and their thickness is greater than the thickness of one handle hole but less than the thickness of two handle holes. This ensures a stable connection without affecting the installation of the boss 33 (e.g., ...). Figure 4(As shown). The surface planting layer 12 is made of backfill soil. Based on the regional environmental characteristics and the habits of farmers' families, it is mainly used for planting vegetables, flowers and grass in the courtyard, which can improve the living environment. The sewage pipe 2 of the house 1 is connected to the three-compartment septic tank 3. The three-compartment septic tank 3 is equipped with a sewage suction pump 4. The outlet of the sewage suction pump 4 is connected to the top of the leachate tank 22 through the first outlet pipe 5. The bottom of the leachate tank 22 is connected to the composite filler layer located on the top layer through the leachate pipe 21. One side of the composite filler layer located on the bottom layer is connected to the water storage tank 14 through the second outlet pipe 13. The water storage tank 14 is equipped with a water suction pump 15. The outlet of the water suction pump 15 is connected to the water distribution tank 17 through the third outlet pipe 16. The water distribution tank 17 is equipped with a water distribution pump 18. The outlet of the water distribution pump 18 is connected to the rhizosphere water distribution system 20 through the fourth outlet pipe 19. The rhizosphere water distribution system 20 is located above the surface planting layer 12.

[0021] Domestic sewage from farmers enters a three-compartment septic tank 3 through a sewage pipe 2. After pretreatment to render it harmless, it is discharged into a leachate tank 22 for impurity removal. The liquid in the leachate tank 22 enters a multi-stage composite packing filter system to purify the domestic sewage. The purified water enters a water storage tank 14. The water can be pumped to a distribution tank 17 by a water pump 15 at regular intervals and in a quantitative manner. Then, according to the growth needs of the crops, the water is pumped to the rhizosphere water distribution system 20 by a water pump 18. This system is mainly used for the quantitative transport and reuse of nutrients and water during the growth of crops in the surface planting layer 12.

[0022] In another embodiment, the multi-layer composite packing material consists of, from bottom to top, a composite sand layer 7, a porous ceramsite packing layer 8, a straw-activated biochar packing layer 9, a matured cow dung packing layer 10, and a charcoal-fired coarse sand filter media layer 11. The charcoal-fired coarse sand filter media layer 11 is mainly used for removing organic pollutants from wastewater. Compared with conventional coarse sand, the surface of the charcoal-fired coarse sand develops a microporous structure, increasing its specific surface area, improving its adsorption capacity, and also enhancing soil fertility. The matured cow dung packing layer 10 is mainly used to improve the removal efficiency of COD, total phosphorus, total nitrogen, and ammonia nitrogen in wastewater. It can also provide nutrients for the growth of microorganisms during wastewater treatment, improving their activity and reproductive capacity. The straw-activated biochar packing layer 9 is mainly used to adsorb organic pollutants in the water, remove suspended solids, adjust pH, and improve soil structure and water retention capacity. The porous ceramsite packing layer 8 is mainly used to enhance the removal efficiency of pollutants such as organic matter and ammonia nitrogen in wastewater. The composite sand layer 7 is mainly used for the final purification of the system's effluent, improving the quality of the effluent.

[0023] In another embodiment, the rhizosphere water distribution system 20 includes a pipe body and multiple nozzles installed on the pipe body. The nozzles spray water onto the crops on the surface planting layer 12. The pipe body is detachably connected to the fourth water outlet pipe to facilitate the replacement and maintenance of the multi-stage composite filler filtration system.

[0024] The above description is only a preferred embodiment of the present utility model and not all embodiments. Anyone should know that structural changes made under the guidance of the present utility model are protected by the present utility model. All technical solutions that are the same as or similar to the present utility model are protected by the present utility model.

Claims

1. A system for the treatment and reuse of domestic sewage in courtyards, characterized in that, The system comprises a three-compartment septic tank, a leachate tank, a multi-stage composite filler infiltration system, a water storage tank, a water distribution tank, and a rhizosphere water distribution system, all connected in sequence. The multi-stage composite filler infiltration system includes a pit in the ground, multiple layers of composite filler within the pit, and a surface planting layer on top of the composite filler layers. Each composite filler layer is composed of multiple modular structures. Each modular structure includes a box with an opening at the top, containing corresponding filler material. The bottom of the box has a protrusion matching the opening. Drainage holes are provided on the bottom and side walls of the box. Handle holes are provided on the side walls of the box, with the distance between the handle hole and the top of the box being less than the thickness of the protrusion. Adjacent boxes on the same layer are fixedly connected by plugs. The shape of the plugs is the same as the handle holes, and the thickness of the plugs is greater than the thickness of one handle hole but less than the thickness of two handle holes. The building's sewage pipe is connected to the three-compartment septic tank, and the leachate tank is located on the ground.

2. The domestic sewage courtyard disposal and resource reuse system as described in claim 1, characterized in that, The three-compartment septic tank is equipped with a suction pump, the outlet of which is connected to the top of the leachate tank via a first outlet pipe; the bottom of the leachate tank is connected to the top layer of composite packing material via a leachate pipe; one side of the bottom layer of composite packing material is connected to a water storage tank via a second outlet pipe; the water storage tank is equipped with a suction pump, the outlet of which is connected to a distribution tank via a third outlet pipe; the distribution tank is equipped with a distribution pump, the outlet of which is connected to a rhizosphere water distribution system via a fourth outlet pipe; the rhizosphere water distribution system is located above the surface planting layer.

3. A system for the treatment and reuse of domestic sewage in courtyards as described in claim 2, characterized in that, The multi-layer composite filler consists of, from bottom to top, a composite sand layer, a porous ceramsite filler layer, a straw activated biochar filler layer, a mature cow dung filler layer, and a charcoal-burned coarse sand filter layer.

4. A system for the treatment and reuse of domestic sewage in courtyards as described in claim 3, characterized in that, The filler material in the charred coarse sand filter media layer is coarse sand that has been charred at 600-1000 degrees Celsius.

5. A system for the treatment and reuse of domestic sewage in courtyards as described in claim 1, characterized in that, The seepage tank is equipped with multiple replaceable filters.

6. A system for the treatment and reuse of domestic sewage in courtyards as described in claim 1, characterized in that, The rhizosphere water distribution system includes a pipe body and multiple nozzles installed on the pipe body, and the pipe body is detachably connected to the fourth water outlet pipe.

7. A system for the treatment and reuse of domestic sewage in courtyards as described in claim 1, characterized in that, The box is made of PVC material.

Images