Unpowered assembly type peasant household sewage purifying and recycling system

Abstract

The invention discloses an unpowered assembly type peasant household sewage purifying and recycling system, and relates to the technical field of rural sewage treatment. The device comprises a full-underground or semi-underground assembled sewage purification tank and a recycling tank communicated with the water outlet end of the assembled sewage purification tank, a primary sedimentation tank is arranged in the center of the assembled sewage purification tank, and a biological filter material module with a multi-stage layered structure is filled between the primary sedimentation tank and the tank wall; the system realizes unpowered operation and natural oxygen supply through a water inlet pipe, a primary sedimentation water distribution device, a water collection system and a ventilation system higher than the earth surface by utilizing gravity flow, atmospheric pressure difference and percolation negative pressure. The biological filter material module performs anti-blocking purification through a combined mechanism of vertical percolation and lateral flow; the system has the advantages of zero power consumption, no professional operation and maintenance, high land utilization rate, short construction period, adaptability to rural intermittent drainage characteristics and the like, and effectively solves the problems of high energy consumption, difficulty in maintenance and poor environmental coordination in rural sewage treatment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rural sewage treatment, in particular to a non-powered assembled rural household sewage purification and recycling system. BACKGROUND

[0002] Due to the characteristics of "small water quantity, scattered distribution, and weak operation and maintenance capability", the existing technology adopts a biochemical combined tank (anaerobic + anoxic + aerobic + sedimentation) made of glass steel / PE material for decentralized sewage treatment in rural areas, but there are the following core pain points in actual application: Energy consumption and operation and maintenance contradiction: the existing system relies on an aeration device for oxygen supply, and the daily average power consumption is about 0.5 kWh. In rural areas, there is a lack of dedicated personnel to bear electricity charges and equipment maintenance, resulting in more than 80% of the equipment being idle after being built (the "sunbathing" phenomenon); High maintenance threshold: the metabolism of microbial flora depends on water quality adaptation and regular debugging, which requires professional personnel to conduct quarterly inspection and maintenance, which is inconsistent with the actual situation of the farmers' "lack of operation and maintenance capability". The equipment is prone to failure due to imbalance of microbial flora; waste of land resources: the existing equipment is mostly semi-underground or surface arranged, and there is no effective utilization design on the top. Under the condition of land shortage in rural areas, farmers have strong resistance; poor adaptability: the traditional equipment is designed for continuous operation. The intermittent drainage characteristics of rural areas, such as "high water quantity during holidays and low water quantity / dry during daily life", result in long start-up period of the equipment (24-48 hours are needed to restore the treatment efficiency); insufficient environmental coordination: the equipment is disconnected with the surrounding environment such as farmland and courtyard, and the farmers have low acceptance. At present, the national rural sewage treatment planning clearly requires a technical route of "low cost, easy maintenance, and high adaptability". The existing equipment cannot meet the above-mentioned needs, and therefore a new type of treatment system is urgently needed to solve the four core problems of "energy consumption, maintenance, land occupation, and adaptability". SUMMARY

[0003] The present application provides a non-powered assembled rural household sewage purification and recycling device, the structure and connection relationship of which are as follows: 1. Overall layout structure The device comprises an assembled sewage purification tank and a recycling tank; The assembled sewage purification tank is fully underground or semi-underground buried, and the top of the tank is within 0.5 m below the ground surface; the tank body structure is a modular prefabricated structure, and the material can be selected from brick-concrete structure, steel structure, or reinforced PE material; A green plant module is laid on the top of the assembled sewage purification tank for planting plants; a fence is arranged around the ground surface to form an integrated layout of underground treatment and above-ground landscape.

[0004] 2. Inlet and primary sedimentation unit A primary sedimentation tank is arranged at the central position inside the assembled sewage purification tank; The external sewage pipe network is connected to the water inlet pipe interface and to the inside of the primary sedimentation tank through a water inlet pipe passing through the pool body; the water inlet pipe is made of UPVC material with a diameter of DN150-300; The upper part of the primary sedimentation tank is provided with a primary sedimentation device, which is a UPVC pipe with a diameter of DN200-300, and has a water distribution function, for uniformly distributing the supernatant after primary sedimentation to the surrounding biological filter material modules.

[0005] 3. Biological filter material purification unit The annular or square space between the primary sedimentation tank and the inner wall of the assembled sewage purification tank is filled with biological filter material modules; The biological filter material modules adopt a multi-level layered structure, including, from top to bottom, a cover layer, a ventilation layer, an upper anti-blocking layer, a lower ventilation layer, a lower anti-blocking layer, a fine filtration layer, and a drainage layer; The biological filter material modules are internally provided with a gravel channel connecting the water distribution layer and the ventilation layer; after the sewage enters, part of it penetrates the anti-blocking filler vertically under the action of gravity; the other part of the sewage that does not have time to infiltrate flows laterally in the water distribution layer filler and enters the lower anti-blocking layer through the gravel channel as a secondary water distribution channel; this combination of vertical flow and lateral flow achieves high dispersion and multi-level interception of pollutant load.

[0006] 4. Unpowered ventilation system The device is provided with an exhaust pipe and an air pipe, with a pipe diameter of DN50-150; The bottom of the exhaust pipe and the air pipe extends to the inside of the ventilation layer of the biological filter material module, and the top is 1.5m higher than the ground; the top of the exhaust pipe is provided with a ventilation cap made of 201 stainless steel; The atmospheric pressure difference formed by the pipeline above the ground is used in combination with the negative pressure generated during the sewage infiltration process to achieve natural circulation of air in the filter material layer, forming an "anaerobic-anoxic-aerobic" alternating microenvironment at the microbial membrane of the fine filtration layer, without the need for electric aeration.

[0007] 5. Effluent and reuse unit The drainage layer at the bottom of the biological filter material module is connected to a water collection system, which collects the purified effluent and enters the reuse tank through a pipe line by gravity through the effluent pipe interface (DN150-300, UPVC material); The reuse tank is made of PE material, with a diameter of about 1000mm and a height of about 2.5m, and is buried underground; A mechanical reuse device is installed at the wellhead of the reuse tank extending to the ground, which is a SS304 manual water pump for manually pumping reuse water for irrigation or flushing.

[0008] 6. Operation mode The device is designed for intermittent operation mode (single cycle 6-8 hours), which is suitable for the drainage characteristics of high water volume in rural holidays, low water volume or no water in daily life; during the period of no water, the biological membrane enters the dormant state, and the treatment efficiency can be restored 2-4 hours after rehydration.

[0009] Compared with the prior art, the beneficial effects of the present application are: 1) The system is driven by natural ventilation throughout the process, which solves the problem of "building and not using"; no professional personnel is needed for bacterial population adjustment, only a regular cleaning of the primary sedimentation tank is needed every 3-6 months, which greatly reduces the maintenance threshold.

[0010] 2) Through special filter material gradation and "vertical + lateral" three-dimensional flow state design, the pollutant load is effectively dispersed, and the anti-blocking ability is enhanced; the system is designed for intermittent drainage characteristics in rural areas, and recovers quickly after dormancy, which adapts to the fluctuation of water volume in holidays.

[0011] 3) The whole underground arrangement combined with top greening planting (land utilization rate 100%) and the design of fence guardrail makes the sewage treatment facility transformed into a courtyard landscape, eliminating the adverse effects of farmers.

[0012] 4) The system is equipped with a non-powered mechanical reuse device, and the water quality meets the reuse standard, which can be directly used for farmland irrigation or courtyard watering, realizing the on-site recycling of water resources.

[0013] 5) The modular prefabricated structure is adopted, which shortens the construction period by more than 50% compared with the traditional cast-in-place process, and has low construction cost, which is suitable for batch promotion in scattered rural household scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0014] The present application will be further described below in conjunction with the drawings and examples: Figure 1 It is a plan view of the sewage purification tank of the present application; Figure 2 It is an elevation view of the assembled sewage purification tank of the present application; Figure 3 It is a detailed view of the biological filter material module of the present application; Figure 4 It is a schematic view of the system section of the present application.

[0015] Reference signs: 1 assembled sewage purification tank; 2 primary sedimentation tank; 3 water inlet pipe interface; 4 water inlet pipe; 5 primary sedimentation device; 6 biological filter material module; 7 water outlet pipe interface; 8 exhaust pipe; 9 air pipe; 10 fence guardrail; 11 greening plant module; 12, reuse tank; 13, mechanical reuse device. DETAILED DESCRIPTION

[0016] The present application will be further described below in conjunction with the drawings and specific examples.

[0017] I. Overall structure of the system As shown in Figure 1 , Figure 2 and Figure 4 , the application provides an unpowered assembled rural household sewage purification and reuse device, which mainly consists of an assembled sewage purification tank 1, a primary sedimentation tank 2, a biological filter material module 6, a ventilation system, a surface greening assembly, and a reuse system.

[0018] Assembled sewage purification tank: The assembled sewage purification tank 1 serves as the main structure and is placed underground or semi-underground, with the top of the tank being 0.5 m lower than the ground surface. The tank body structure can be made of brick-concrete structure, steel structure, or reinforced PE material modular prefabricated parts, which are assembled on site to effectively shorten the construction period by more than 50%.

[0019] Primary sedimentation and water distribution system: The primary sedimentation tank 2 is placed in the center of the assembled sewage purification tank 1. External sewage (rural household kitchen sewage, toilet sewage, and effluent from septic tanks) is converged through existing sewage pipes, introduced into the primary sedimentation tank 2 through the water inlet pipe interface 3 and the water inlet pipe 4 (DN150-300, UPVC material).

[0020] The upper part of the primary sedimentation tank 2 is provided with a primary sedimentation device 5 (DN200-300, UPVC material) as a water distribution device, which is used to uniformly distribute the supernatant after sedimentation to the top of the surrounding biological filter material module 6 to avoid local overload and blockage.

[0021] Biological filter material module: As shown in Figure 3 and Figure 4 , the biological filter material module 6 is filled in the space between the inner wall of the primary sedimentation tank 2 and the purification tank 1. The module adopts a multi-stage layered design, including, from top to bottom, a cover layer, an upper ventilation layer, an upper anti-blocking layer, a lower ventilation layer, a lower anti-blocking layer, a fine filtration layer, and a drainage layer.

[0022] Anti-blocking mechanism: The module is provided with a gravel channel (equivalent to a secondary water distribution channel) connecting the water distribution layer and the ventilation layer. When sewage enters the biological infiltration unit, a part of it penetrates the anti-blocking filler vertically under the action of gravity; the sewage that does not have time to infiltrate flows laterally in the water distribution layer filler and enters the lower anti-blocking layer through the gravel channel. This design disperses the load of pollutants (especially suspended particles) highly, combines the interception of fillers with different particle sizes and the decomposition of microbial membranes, and greatly improves the anti-blocking capacity of the system.

[0023] Ventilation system (unpowered oxygen supply): The system is provided with an exhaust pipe 8 and a vent pipe 9 (DN50-150), the top of which is higher than the ground 1.5 m, wherein the exhaust pipe 8 is provided with a 201 stainless steel ventilation cap at the top. The bottom of the pipe extends to the ventilation layer of the biological filter material module 6; the system utilizes the atmospheric pressure difference and the negative pressure generated by the sewage percolation to realize the natural air circulation, provides oxygen for the microbial membrane of the fine filter layer, and forms an "anaerobic-anoxic-aerobic" alternating microenvironment inside the filter material, without power aeration.

[0024] Ground greening and reuse system: The top of the assembled sewage purification tank 1 is paved with a greening plant module 11 (general specification 500*400*300mm), and a PVC fence 10 with a height of 0.3-0.5m is arranged around to form a "underground treatment + ground greening" layout.

[0025] The purified effluent is collected through the bottom water collection system and flows to the reuse tank 12 through the effluent pipe interface 7. The reuse tank 12 is a PE tank with a diameter of 1000mm and a height of 2.5m; the top of the tank is provided with a mechanical reuse equipment 13 (SS304 material manual water pump) for farmers to manually extract clean water for farmland irrigation or courtyard watering, realizing on-site resource utilization.

[0026] II. Operation parameters and implementation effects The device is designed to operate in an intermittent mode, and a single cycle is 6-8 hours; during the holiday high water period, the water can be continuously fed, and the biological membrane is in a dormant state during the daily low water period or no water, and the efficiency can be restored 2-4 hours after the water is fed.

[0027] 1. Inlet and outlet water quality indicators In this embodiment, the design of the inlet water quality refers to the typical water quality after the rural black water and grey water are collected, and after the system is treated, the outlet water quality indicators are as follows: Inlet water quality: CODcr≤350mg / L; BOD5≤180mg / L; SS≤200mg / L; ammonia nitrogen≤35mg / L; total nitrogen≤45mg / L; total phosphorus≤5mg / L; pH: 6-9.

[0028] Outlet water quality: CODcr≤80mg / L; SS≤20mg / L; ammonia nitrogen≤15mg / L; total nitrogen≤20mg / L; total phosphorus≤2mg / L; pH: 6-9.

[0029] The above outlet water quality meets the requirements of farmland irrigation or standard discharge.

[0030] 2. Implementation scale and selection The present application supports single and joint household modes, and according to different household scales, the specific implementation specifications of the system are shown in the following table: Table 1: Joint household water volume estimation table Table 2: Process design specification table (Note: design load 0.2-0.4 m³ / m²·d, dry-wet ratio 1:7) III. Maintenance instructions Cleaning maintenance: the sludge (sludge) in the primary sedimentation tank 2 only needs to be cleaned once every 3-6 months through the reserved cleaning port, which is consistent with the frequency of traditional septic tanks.

[0031] Daily maintenance: the system has no power components, and there is no daily electricity bill. The mechanical reuse device 13 is simple in structure, and the farmers can operate it by themselves.

[0032] Seasonal adaptation: the system is fully underground and has a soil green layer, has good heat preservation performance, and can adapt to winter operation.

[0033] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application; it should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application.

Claims

1. A non-powered fabricated farmer's sewage purification and reuse system, characterized in that, The system comprises an assembled sewage purification tank (1) and a reuse tank (12) connected therewith; The assembled sewage purification tank (1) is arranged underground or semi-underground, and an initial sedimentation tank (2) is arranged at the central position in the tank; the space between the initial sedimentation tank (2) and the inner wall of the assembled sewage purification tank (1) is filled with biological filter material modules (6); The system further comprises: an inlet water system comprising an inlet water pipe (4) connected to the initial sedimentation tank (2) through the assembled sewage purification tank (1); a water distribution device, the upper portion of the initial sedimentation tank (2) is provided with an initial sedimentation device (5) for uniformly distributing the sewage after initial sedimentation to the top of the biological filter material modules (6); a water collection and drainage system arranged at the bottom of the biological filter material modules (6) for collecting the filtered clean water and discharging the water through an outlet water pipe (7); a ventilation system comprising an exhaust pipe (8) and an air pipe (9) connected to the atmosphere for forming natural air circulation in the tank body; the outlet water pipe (7) is connected to the reuse tank (12) through a pipeline, and the reuse tank (12) is provided with a mechanical reuse device (13) for extracting reuse water.

2. The unpowered fabricated farmer's sewage purification and reuse system according to claim 1, characterized in that, The biological filter material modules (6) adopt a layered structure, and comprise, from top to bottom, a cover layer, an upper ventilation layer, an upper anti-blocking layer, a lower ventilation layer, a lower anti-blocking layer, a fine filter layer and a drainage layer; the outlet water of the initial sedimentation device (5) enters the upper anti-blocking layer and / or the water distribution layer, and the sewage vertically infiltrates under the action of gravity and performs combined motion of lateral flow and vertical flow through fillers with different particle sizes.

3. The unpowered fabricated farmer's sewage purification and reuse system according to claim 2, characterized in that, The biological filter material modules (6) are provided with gravel channels connected between the water distribution layer and the ventilation layer, forming secondary water distribution channels, so that the sewage that has not been vertically infiltrated in time can flow laterally and enter the lower anti-blocking layer through the gravel channels.

4. The unpowered fabricated farmer's sewage purification and reuse system according to claim 1, characterized in that, The ventilation system utilizes the atmospheric pressure difference and the negative pressure generated by the sewage infiltration to realize unpowered oxygen supply. The top of the exhaust pipe (8) and the air pipe (9) is higher than the ground level, and the bottom extends to the ventilation layer of the biological filter material modules (6), forming an anaerobic, anoxic and aerobic microenvironment in the biological filter material modules (6).

5. The unpowered fabricated farmer's sewage purification and reuse system according to claim 1, characterized in that, The top of the assembled sewage purification tank (1) is paved with a green plant module (11), the green plant module (11) is planted with plants, and the top elevation of the assembled sewage purification tank (1) is within 0.5 m below the ground level; The assembled sewage purification tank (1) is provided with a fence (10) around the ground.

6. The unpowered fabricated farmer's sewage purification and reuse system according to claim 1, characterized in that, The reuse tank (12) is a PE material tank buried underground; the mechanical reuse device (13) is a stainless steel manual water pump installed at the well mouth of the reuse tank (12) extending out of the ground.

7. The unpowered fabricated farmer's sewage purification and reuse system according to claim 1, characterized in that, The main structure of the assembled sewage purification tank (1) is assembled on site by using modular prefabricated parts; the material of the modular prefabricated parts comprises one of brick-concrete structure, steel structure or reinforced PE material.

8. The unpowered fabricated farmer's sewage purification and reuse system according to claim 4, characterized in that, The top of the exhaust pipe (8) and the air pipe (9) is higher than the ground level by 1.5 m, and the top of the exhaust pipe (8) is provided with a ventilation cap.

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