Agricultural sewage treatment system

Abstract

Belonging to the technical field of sewage treatment systems, the invention relates to an agricultural sewage treatment system, which comprises a first treatment tank and a second treatment tank. A sedimentation tank, an anaerobic tank and a multi-stage baffling tank are sequentially arranged in the first treatment tank from front to back; a water stacking tank, an aerobic tank, a filtering tank and a clean water tank are sequentially arranged in the second treatment tank from front to back; a water inlet pipe is arranged at the front end of the first treatment tank and connected to the sedimentation tank, the rear end of the multi-stage baffling tank is connected with the water stacking tank through a connecting pipe, a liquid distribution pipe is arranged at the tail end of the connecting pipe, and a water outlet pipe is arranged at the clean water tank at the rear end of the second treatment tank. According to the invention, the two treatment tanks form a set of sewage treatment system, the two treatment tanks adopt an unpowered form to realize step-by-step treatment of domestic wastewater, and reasonable arrangement can be carried out according to the characteristics of sewage (such as water quality and water volume) and site conditions; suspended filler and filtering filler are adopted for dual treatment, the filler is replaced regularly, the operation cost is low, and maintenance is easy and convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment systems, and in particular relates to agricultural sewage treatment systems. Background Art

[0002] The current state of the art in agricultural wastewater systems covers a variety of treatment methods and technologies, aiming to address the wastewater problems generated during agricultural production. These wastewaters usually contain high concentrations of organic matter, nitrogen, phosphorus and other nutrients. If not properly treated, they will cause serious pollution to water bodies. The more common existing technologies include physical treatment, chemical treatment, biological treatment and ecological treatment.

[0003] Among them, physical treatment methods usually use screens to intercept large debris to prevent subsequent treatment units from clogging, and use sedimentation tanks to remove suspended solids and reduce the particulate matter content in sewage; chemical treatment methods usually include chemical flocculation and chemical oxidation. Chemical flocculation promotes the coagulation and sedimentation of suspended matter in sewage by adding chemical agents, effectively removing suspended solids and some soluble substances; chemical oxidation uses oxidants such as ozone and chlorine to remove difficult-to-degrade organic matter in sewage; biological treatment methods usually include anaerobic digestion, aerobic treatment and biofilters. Anaerobic digestion uses anaerobic microorganisms to decompose organic matter and produce biogas for energy recovery, which is suitable for the treatment of high-concentration organic wastewater; aerobic treatment provides oxygen through aeration, It promotes aerobic microorganisms to degrade organic matter and is widely used in the treatment of low-concentration organic wastewater. The biological filter uses the biofilm grown on the surface of the filler to remove pollutants and is suitable for treating small and medium-sized agricultural wastewater. Ecological treatment methods include artificial wetlands, land infiltration, stabilization ponds, etc. Artificial wetlands are ecosystems that imitate natural wetlands, using the combined action of plant roots and microorganisms to purify sewage, and are suitable for decentralized agricultural sewage treatment. Land infiltration doses sewage to the soil surface in a controlled manner, using the filtration and biodegradation effects of the soil to purify sewage. Stabilization ponds use the self-purification ability of natural water bodies to treat sewage, and are divided into three types: aerobic ponds, facultative ponds and anaerobic ponds, and are suitable for large-scale agricultural wastewater treatment.

[0004] However, the above treatment methods all have corresponding defects. For example, the physical treatment method is inefficient and ineffective in reducing the odor of sewage. Chemical treatment and biological treatment methods require operators with professional skills to operate and maintain, and the long-term cost is relatively high. The ecological treatment method is too dependent on local geographical and hydrological conditions, occupies a large area, and requires strict implementation of sewage discharge standards, otherwise it will damage the environment. Therefore, it is necessary to design an agricultural sewage treatment system specifically for rural domestic sewage treatment to improve the effect and level of rural domestic sewage treatment and improve the quality of rural environment. Summary of the invention

[0005] The present invention provides an agricultural sewage treatment system to solve the technical problems existing in the known technology, which has the characteristics of complete set installation, small footprint and convenient maintenance.

[0006] The present invention includes the following technical solutions: an agricultural sewage treatment system, comprising a first treatment tank and a second treatment tank; the first treatment tank is provided with a sedimentation tank, an anaerobic tank and a multi-stage baffled tank in sequence from front to back; the second treatment tank is provided with a cascade water tank, an aerobic tank, a filtration tank and a clear water tank in sequence from front to back; a water inlet pipe is provided at the front end of the first treatment tank and connected to the sedimentation tank, the rear end of the multi-stage baffled tank is connected to the cascade water tank through a connecting pipe, a liquid separation pipe is provided at the end of the connecting pipe, and a water outlet pipe is provided at the clear water tank at the rear end of the second treatment tank.

[0007] Furthermore, the first treatment tank and the second treatment tank are made of cement, fiberglass or PE plastic. The specific material selection can be selected according to the on-site environment. Since the pollutant concentration of rural domestic sewage is relatively low, and each household has a sedimentation tank or septic tank for pre-treatment, when setting up this system, it can be decided whether to retain the original sedimentation tank or septic tank according to the installation site.

[0008] Furthermore, the top of the sedimentation tank and the cascading tank is provided with an exhaust pipe, and the top of the aerobic tank is provided with a double vent pipe. The exhaust pipe is provided to adjust the air pressure at various locations in the tank, and the exhaust pipe can be connected to a gas collection device or a biogas utilization system. The double vent pipe is provided to intermittently aerate the aerobic tank, opening for 15 minutes and closing for 15 minutes.

[0009] Furthermore, L-shaped guide pipes are provided between the sedimentation tank and the anaerobic tank, and between the anaerobic tank and the multi-stage baffle tank. The feed ports of the two L-shaped guide pipes are respectively located in the middle of the sedimentation tank and the middle of the anaerobic tank, and the discharge ports of the two L-shaped guide pipes are respectively located at the top of the anaerobic tank and the top of the multi-stage baffle tank.

[0010] Furthermore, the multi-stage baffle tank is divided into a plurality of independent chambers, and adjacent chambers are connected by horizontal guide pipes; each chamber is provided with a plurality of guide plates for guiding the sewage baffle.

[0011] Furthermore, L-shaped connecting pipes are provided between the cascading pool and the aerobic pool, and between the aerobic pool and the filter pool. The water inlets of the two L-shaped connecting pipes are respectively located at the top of the cascading pool and the middle of the aerobic pool, and the water outlets of the two L-shaped connecting pipes are respectively located at the bottom of the aerobic pool and the bottom of the filter pool.

[0012] Furthermore, the aerobic pool is provided with suspended fillers located in the middle and top of the water surface, and the filter pool has several layers of bagged filter fillers stacked on the rack; the suspended fillers are located higher than the filter fillers.

[0013] Further, the suspension filler is a porous suspension ball, and the filter filler is ceramsite. The porous suspension ball is also called a porous biological suspension ball, which is made of polypropylene material injection molding, and is divided into an inner and outer double-layer sphere, the outer part is a hollow fishnet sphere, and the inner part is a rotating sphere. This filler utilizes the biofilm treatment technology, mainly plays the role of a biofilm carrier, and also has the function of intercepting suspended matter. It has the characteristics of strong biological adhesion, large specific surface area, high porosity, good chemical and biological stability, durability, no dissolution of harmful substances, no secondary pollution, UV protection, anti-aging, strong hydrophilicity, etc. During use, microorganisms are easy to generate, easy to replace, acid and alkali resistant, anti-aging, not affected by water flow, long service life, less residual sludge, and easy installation.

[0014] Furthermore, a horizontal water pipe connected to the clean water tank is provided in the middle of the filter tank.

[0015] Furthermore, each of the sedimentation tank, multi-stage baffle tank, cascading tank, aerobic tank, filtration tank and clear water tank is provided with at least one inspection well to facilitate inspection and maintenance during subsequent use.

[0016] The present invention has the following advantages and positive effects: 1. The present invention forms a sewage treatment system through two treatment tanks. The two treatment tanks are used to realize the step-by-step treatment of domestic wastewater in an unpowered manner, and can be reasonably set according to the characteristics of the sewage (such as water quality, water volume) and site conditions.

[0017] 2. The present invention uses suspended fillers and filter fillers for dual treatment, and the fillers are replaced regularly, which not only ensures that the sewage treatment meets the discharge standards but also reduces the operating costs, and at the same time achieves economic and social benefits.

[0018] 3. The present invention facilitates the staff to conduct a comprehensive inspection and maintenance of the system on a regular basis, and timely discover and deal with potential problems, such as equipment wear, pipeline blockage, etc.; the organic fertilizer produced after treatment can be regularly collected and returned to the field for use, promoting the harmonious coexistence of agriculture and the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the present invention; Figure 3 yes Figure 2 AA cross-sectional diagram of ; In the figure, 1-the first treatment tank; 101-the sedimentation tank; 102-the anaerobic tank; 103-the multi-stage baffle tank; 2-the second treatment tank; 201-the cascade tank; 202-the aerobic tank; 203-the filtration tank; 204-the clean water tank; 3-the connecting pipe; 301-the liquid separation pipe; 4-the water inlet pipe; 5-the water outlet pipe; 6-the exhaust pipe; 7-the double ventilation pipe; 8-the inspection well; 9-the suspended filler; 10-the filter filler; 11-the L-type guide pipe; 12-the L-type connecting pipe; 13-the horizontal guide pipe; 14-the guide plate; 15-the horizontal water diversion pipe. DETAILED DESCRIPTION

[0020] In order to further disclose the content, features and effects of the present invention, the following examples are given and described in detail in conjunction with the accompanying drawings. In the description of the following embodiments, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this patent.

[0021] In the description of the following embodiments, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0022] Example: See attached Figure 1-3 , an agricultural sewage treatment system, comprising a first treatment tank 1 and a second treatment tank 2; the first treatment tank 1 is provided with a sedimentation tank 101, an anaerobic tank 102 and a multi-stage baffled tank 103 in sequence from front to back; the second treatment tank 2 is provided with a cascade tank 201, an aerobic tank 202, a filtration tank 203 and a clear water tank 204 in sequence from front to back; a water inlet pipe 4 is provided at the front end of the first treatment tank 1 to connect to the sedimentation tank 101, and the rear end of the multi-stage baffled tank 103 is connected to the cascade tank 201 through a connecting pipe 3, and a liquid separation pipe 301 is provided at the end of the connecting pipe 3, and a water outlet pipe 5 is provided at the clear water tank 204 at the rear end of the second treatment tank 2.

[0023] The first treatment tank 1 and the second treatment tank 2 are made of cement, glass fiber reinforced plastic or PE plastic. The specific material selection can be selected according to the on-site environment. Since the pollutant concentration of rural domestic sewage is low, and each household has a sedimentation tank or septic tank for pre-treatment, when setting up this system, it can be decided whether to retain the original sedimentation tank or septic tank according to the installation site.

[0024] The top of the sedimentation tank 101 and the cascading tank 201 is provided with an exhaust pipe 6, and the top of the aerobic tank 202 is provided with a double vent pipe 7. The exhaust pipe 6 is provided to adjust the air pressure at various locations in the tank, and the exhaust pipe 6 can be connected to a gas collection device or a biogas utilization system. The double vent pipe 7 is provided to intermittently aerate the aerobic tank 202, opening for 15 minutes and closing for 15 minutes.

[0025] An L-shaped guide pipe 11 is provided between the sedimentation tank 101 and the anaerobic tank 102, and between the anaerobic tank 102 and the multi-stage baffle tank 103. The feed ports of the two L-shaped guide pipes 11 are respectively located in the middle of the sedimentation tank 101 and the middle of the anaerobic tank 102, and the discharge ports of the two L-shaped guide pipes 11 are respectively located at the top of the anaerobic tank 102 and the top of the multi-stage baffle tank 103. In this example, the multi-stage baffle tank 103 is divided into three independent chambers, and the adjacent chambers are connected by horizontal guide pipes 13; each chamber is provided with a plurality of guide plates 14 for guiding the sewage baffle.

[0026] An L-shaped connecting pipe 12 is provided between the stacked water pool 201 and the aerobic pool 202, and between the aerobic pool 202 and the filter pool 203. The water inlets of the two L-shaped connecting pipes 12 are respectively located at the top of the stacked water pool 201 and the middle of the aerobic pool 202, and the water outlets of the two L-shaped connecting pipes 12 are respectively located at the bottom of the aerobic pool 202 and the bottom of the filter pool 203. The aerobic pool 202 is provided with a suspended filler 9 located in the middle and top of the water surface, and the filter pool 203 has several layers of bagged filter fillers 10 stacked on a shelf; the position of the suspended filler 9 is higher than the filter filler 10. The suspended filler 9 is a porous suspended ball, and the filter filler 10 is ceramsite. The porous suspended ball is also called a porous biological suspended ball, which is made of injection molding of polypropylene material and is divided into an inner and outer double-layer sphere, the outer layer is a hollow fishnet sphere, and the inner layer is a rotating sphere. This filler utilizes the biofilm treatment technology, mainly plays the role of biofilm carrier, and also has the function of intercepting suspended solids, has strong biological adhesion, large specific surface area, high porosity, good chemical and biological stability, durability, no dissolution of harmful substances, no secondary pollution, UV protection, anti-aging, strong hydrophilicity, etc. During use, microorganisms are easy to generate, easy to replace, acid and alkali resistant, anti-aging, not affected by water flow, long service life, less residual sludge, and easy to install. A horizontal water diversion pipe 15 connected to the clean water tank 204 is provided in the middle of the filter tank 203.

[0027] The sedimentation tank 101, the cascading tank 201 and the clean water tank 204 are each provided with an inspection well 8; the aerobic tank 202 and the filtering tank 203 are each provided with two inspection wells 8; each compartment of the multi-stage baffle tank 103 is provided with 1-2 inspection wells 8 for the convenience of inspection and maintenance during subsequent use.

[0028] Although the preferred embodiments of the present invention are described above, the present invention is not limited to the above specific embodiments, which are merely illustrative and not restrictive. Under the guidance of the present invention, a person skilled in the art can make many forms without departing from the scope of the present invention and the claims. All of these belong to the protection scope of the present invention.

Claims

1. Agricultural sewage treatment system, characterized by: The invention comprises a first treatment tank (1) and a second treatment tank (2); the first treatment tank (1) is provided with a sedimentation tank (101), an anaerobic tank (102) and a multi-stage baffled tank (103) in sequence from front to back; the second treatment tank (2) is provided with a cascading tank (201), an aerobic tank (202), a filtering tank (203) and a clear water tank (204) in sequence from front to back; a water inlet pipe (4) is provided at the front end of the first treatment tank (1) to be connected to the sedimentation tank (101); the rear end of the multi-stage baffled tank (103) is connected to the cascading tank (201) via a connecting pipe (3); a liquid separation pipe (301) is provided at the end of the connecting pipe (3); and a water outlet pipe (5) is provided at the clear water tank (204) at the rear end of the second treatment tank (2).

2. The agricultural sewage treatment system according to claim 1, characterized in that: The first processing tank (1) and the second processing tank (2) are made of cement, glass fiber reinforced plastic or PE plastic.

3. The agricultural sewage treatment system according to claim 1, characterized in that: An exhaust pipe (6) is provided at the top of the sedimentation tank (101) and the cascading tank (201), and a double ventilation pipe (7) is provided at the top of the aerobic tank (202).

4. The agricultural sewage treatment system according to claim 1, characterized in that: L-shaped guide pipes (11) are provided between the sedimentation tank (101) and the anaerobic tank (102), and between the anaerobic tank (102) and the multi-stage baffle tank (103); the feed inlets of the two L-shaped guide pipes (11) are respectively located at the middle of the sedimentation tank (101) and the middle of the anaerobic tank (102); and the discharge outlets of the two L-shaped guide pipes (11) are respectively located at the top of the anaerobic tank (102) and the top of the multi-stage baffle tank (103).

5. The agricultural sewage treatment system according to claim 1, characterized in that: The multi-stage baffle tank (103) is divided into a plurality of independent chambers, and adjacent chambers are connected via horizontal guide pipes (13); each chamber is provided with a plurality of guide plates (14) for guiding the sewage baffles.

6. The agricultural sewage treatment system according to claim 1, characterized in that: L-shaped connecting pipes (12) are provided between the cascading pool (201) and the aerobic pool (202), and between the aerobic pool (202) and the filtering pool (203); the water inlets of the two L-shaped connecting pipes (12) are respectively located at the top of the cascading pool (201) and the middle of the aerobic pool (202); and the water outlets of the two L-shaped connecting pipes (12) are respectively located at the bottom of the aerobic pool (202) and the bottom of the filtering pool (203).

7. The agricultural sewage treatment system according to claim 6, characterized in that: The aerobic pool (202) is provided with suspended fillers (9) located in the middle and top of the water surface, and the filter pool (203) has several layers of bagged filter fillers (10) stacked on a shelf; the suspended fillers (9) are located higher than the filter fillers (10).

8. The agricultural sewage treatment system according to claim 7, characterized in that: The suspension filler (9) is porous suspension balls, and the filter filler (10) is ceramsite.

9. The agricultural sewage treatment system according to claim 6, characterized in that: A horizontal water pipe (15) connected to the clean water tank (204) is provided in the middle of the filter tank (203).

10. The agricultural sewage treatment system according to any one of claims 1 to 9, characterized in that: At least one inspection well is provided in each of the sedimentation tank (101), the multi-stage baffle tank (103), the cascading tank (201), the aerobic tank (202), the filtering tank (203) and the clear water tank (204).

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