Rural sewage treatment system

Abstract

The rural sewage treatment system comprises a grating well, an anoxic tank, a multifunctional tank, an aerobic tank, a membrane tank and a sedimentation tank which are sequentially connected, a water inlet pipeline is arranged at the front end of the grating well, a clean water tank and a sludge tank are arranged at the rear end of the sedimentation tank, and a water outlet pipeline is arranged at the rear end of the clean water tank; a first return pipeline is arranged between the membrane tank and the multifunctional tank, and a second return pipeline is arranged between the membrane tank and an inlet pipeline of the anoxic tank; a first sludge pipeline is arranged between the membrane tank and the sludge tank, and a second sludge pipeline is arranged between the sedimentation tank and the sludge tank. According to the utility model, multi-point backflow and multi-point dosing of medicaments are adopted, the anoxic retention time can be prolonged, the denitrification effect is complete, the multifunctional tank can be adjusted to be an anoxic tank or an aerobic tank as required, the treatment efficiency is improved, and the plug flow stirrer can adjust materials in the anoxic tank, keep uniform mixing of sludge and water, avoid sludge deposition and improve the mixing efficiency; an anoxic environment is created, and the anoxic retention time is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of rural sewage treatment, in particular to a rural sewage treatment system. Background Art

[0002] Water resource scarcity and water pollution are major obstacles to the healthy and sustainable development of my country's economy, and the hazards of water pollution and its control are receiving considerable attention. Urban sewage treatment plants collect and centrally treat sewage, but rural areas suffer from underdeveloped infrastructure and poor management. Furthermore, sewage treatment volumes are small, geographically dispersed, difficult to collect and manage, and have high operating costs. As a result, much of rural domestic and agricultural wastewater is discharged directly without treatment, typically into seepage pits within courtyards or along roads and side ditches into village drainage ditches. This wastewater seeps into groundwater or flows through drainage ditches into rivers, polluting surface and groundwater levels and degrading the local environment. Direct discharge of wastewater into lakes also affects water quality elsewhere, ultimately threatening human health. Rural sewage pollution seriously impacts the quality of life of rural residents. Addressing rural water pollution is imperative to accelerate the development of my country's new countryside and improve the rural ecological environment.

[0003] Existing rural sewage treatment facilities primarily utilize the AO process, also known as the anaerobic-aerobic process, which subjects sewage to two biological treatment processes, anaerobic and aerobic, to simultaneously remove organic matter, nitrogen, and phosphorus. The total nitrogen content of the influent of existing rural sewage treatment facilities frequently exceeds the designed total nitrogen content. The anoxic tank has a short residence time, and the membrane tank has a high level of dissolved oxygen. The high DO of the reflux mixed liquor affects the denitrification effect of the anoxic zone, potentially preventing the total nitrogen from meeting the standard. This is because the denitrification process must be carried out in an anoxic environment, and the length of the anoxic period directly affects the denitrification efficiency. If the anoxic period is too short, denitrifying bacteria may not be able to fully perform denitrification. Utility Model Content

[0004] In view of this, the utility model aims to propose a rural sewage treatment system to solve the problems of short hypoxia time and poor denitrification effect.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0006] A rural sewage treatment system comprises a grille well, an anoxic tank, a multifunctional tank, an aerobic tank, a membrane tank, and a sedimentation tank connected in sequence. The front end of the grille well is provided with a water inlet pipe, the rear end of the sedimentation tank is provided with a clear water tank and a sludge tank, and the rear end of the clear water tank is provided with a water outlet pipe.

[0007] A first reflux pipeline is provided between the membrane pool and the multifunctional pool, and a second reflux pipeline is provided between the membrane pool and the inlet pipeline of the anoxic pool;

[0008] A first sludge pipeline is provided between the membrane tank and the sludge tank, and a second sludge pipeline is provided between the sedimentation tank and the sludge tank.

[0009] A basket screen is provided in the screen well, and sewage flows to the basket screen by gravity. The basket screen can intercept larger solid waste, remove large particles and prevent pipes from being blocked.

[0010] In the anoxic tank, phosphate-accumulating bacteria decompose organic matter through fermentation under an oxygen-deficient environment, using the energy generated by this process to absorb and store phosphate (in the form of polyphosphates). Simultaneously, to maintain energy balance, phosphate-accumulating bacteria decompose the polyphosphates in their bodies, releasing soluble phosphates into the environment. In the aerobic tank, nitrification degrades organic matter and absorbs phosphorus. The membrane tank removes SS.

[0011] Setting up the first reflux pipeline and setting it as multi-point reflux can increase the anoxic residence time and make the denitrification complete.

[0012] Furthermore, the anoxic tank and the multifunctional tank are both provided with reagent dosing pipelines.

[0013] Furthermore, the agent is a carbon source.

[0014] Adding a reagent dosing pipeline in the anoxic tank and setting it up for multi-point dosing can avoid the problem that when the reagent is added to the return pipeline, the DO of the reflux mixed liquid is high, and part of the carbon source will be consumed during mixed dosing.

[0015] Furthermore, the aerobic pool is connected to a first blower, and the membrane pool is connected to a second blower. The first blower and the second blower are used to transport air to the aerobic pool and the membrane pool.

[0016] Furthermore, the sedimentation tank is connected to a PAC dosing pipeline, and the sedimentation tank is an inclined tube sedimentation tank.

[0017] Furthermore, a lifting pump is provided between the grid well and the anoxic tank.

[0018] Furthermore, the outlet pipe is connected to a sodium hypochlorite dosing pipe. Sodium hypochlorite has a disinfecting effect, and the sewage is discharged into the surrounding river after being disinfected by sodium hypochlorite.

[0019] Furthermore, the multifunctional pool is an anoxic pool or an aerobic pool.

[0020] Furthermore, the bottoms of the multifunctional pool, aerobic pool and membrane pool are all provided with aeration devices.

[0021] An aeration device is installed at the bottom of the multifunctional pool and can be turned on as needed. In winter, the sewage temperature is low and the biochemical reaction rate is reduced. Therefore, the multifunctional pool can be used as an anoxic pool to prolong the anoxic time, promote denitrification, and increase denitrification efficiency. When the COD and other indicators of the influent water quality are high, the multifunctional pool can be used as an aerobic pool to prolong the aerobic residence time, turn on the bottom aeration, and improve the treatment efficiency.

[0022] Furthermore, two plug-flow agitators are provided at opposite corners of the anoxic tank. The plug-flow agitators can more effectively adjust the materials in the anoxic tank, maintain a uniform mixing of sludge and water, avoid sludge sedimentation, improve mixing efficiency, create an anoxic environment, and increase anoxic residence time.

[0023] Compared with the existing technology, the rural sewage treatment system described in this utility model has the following advantages:

[0024] (1) The utility model changes the regulating tank in the prior art into an anoxic tank, and sets a reflux pipeline between the membrane tank and the anoxic tank. The multi-point reflux is set up to increase the anoxic residence time and make the denitrification complete.

[0025] (2) The present invention adds a reagent dosing pipeline to the anoxic tank and sets it to multi-point dosing, which can avoid the problem that when the reagent is added to the return pipeline, the DO of the reflux mixed liquid is high, and part of the carbon source will be consumed during the mixed dosing.

[0026] (3) The multifunctional pool of the present invention can be adjusted to an anoxic pool or an aerobic pool as needed, and an aeration device is set at the bottom. In winter, the sewage water temperature is low and the biochemical reaction rate is reduced. Therefore, the multifunctional pool can be used as an anoxic pool to extend the anoxic time, promote denitrification, and increase the denitrification efficiency; when the COD and other indicators of the influent water quality are high, the multifunctional pool can be used as an aerobic pool to extend the aerobic residence time, turn on the bottom aeration, and improve the treatment efficiency.

[0027] (4) The plug-flow agitator of the utility model can more effectively adjust the materials in the anoxic tank, maintain uniform mixing of sludge and water, avoid sludge deposition, improve mixing efficiency, create anoxic environment, and increase anoxic residence time. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 This is a schematic diagram of a rural sewage treatment system described in an embodiment of the present utility model.

[0030] Description of reference numerals:

[0031] 1. First return pipeline; 2. Second return pipeline; 3. First sludge pipeline; 4. Second sludge pipeline; 5. Chemical dosing pipeline; 6. PAC dosing pipeline; 7. Sodium hypochlorite dosing pipeline. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0034] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0035] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0036] like Figure 1 As shown, a rural sewage treatment system includes a grille well, an anoxic tank, a multifunctional tank, an aerobic tank, a membrane tank, and a sedimentation tank connected in sequence. The front end of the grille well is provided with a water inlet pipe, the rear end of the sedimentation tank is provided with a clear water tank and a sludge tank, and the rear end of the clear water tank is provided with a water outlet pipe.

[0037] A first reflux pipeline 1 is provided between the membrane pool and the multifunctional pool, and a second reflux pipeline 2 is provided between the membrane pool and the inlet pipeline of the anoxic pool;

[0038] A first sludge pipeline 3 is provided between the membrane tank and the sludge tank, and a second sludge pipeline 4 is provided between the sedimentation tank and the sludge tank.

[0039] A basket screen is provided in the screen well, and sewage flows to the basket screen by gravity. The basket screen can intercept larger solid waste, remove large particles and prevent pipes from being blocked.

[0040] In the anoxic tank, phosphate-accumulating bacteria decompose organic matter through fermentation under an oxygen-deficient environment, using the energy generated by this process to absorb and store phosphate (in the form of polyphosphates). Simultaneously, to maintain energy balance, phosphate-accumulating bacteria decompose the polyphosphates in their bodies, releasing soluble phosphates into the environment. In the aerobic tank, nitrification degrades organic matter and absorbs phosphorus. The membrane tank removes SS.

[0041] Setting the first reflux line 1 to multi-point reflux can increase the anoxic residence time and make the denitrification complete.

[0042] The anoxic pool and the multifunctional pool are both provided with a reagent dosing pipeline 5 .

[0043] The agent is a carbon source.

[0044] Adding a reagent dosing line 5 to the anoxic tank and setting it to multi-point dosing can avoid the problem that when the reagent is added to the return line, the DO of the reflux mixed liquid is high, and part of the carbon source will be consumed during mixed dosing.

[0045] The aerobic pool is connected to a first blower, and the membrane pool is connected to a second blower. The first blower and the second blower are used to transport air to the aerobic pool and the membrane pool.

[0046] The sedimentation tank is connected to a PAC dosing pipeline 6, and the sedimentation tank is an inclined tube sedimentation tank.

[0047] A lifting pump is provided between the grid well and the anoxic pool.

[0048] The outlet pipe is connected with a sodium hypochlorite adding pipe 7. Sodium hypochlorite has a disinfecting effect, and the sewage is discharged to the surrounding river after being disinfected by sodium hypochlorite.

[0049] The multifunctional pool is an anoxic pool or an aerobic pool.

[0050] Aeration devices are provided at the bottom of the multifunctional pool, aerobic pool and membrane pool.

[0051] An aeration device is installed at the bottom of the multifunctional pool and can be turned on as needed. In winter, the sewage temperature is low and the biochemical reaction rate is reduced. Therefore, the multifunctional pool can be used as an anoxic pool to prolong the anoxic time, promote denitrification, and increase denitrification efficiency. When the COD and other indicators of the influent water quality are high, the multifunctional pool can be used as an aerobic pool to prolong the aerobic residence time, turn on the bottom aeration, and improve the treatment efficiency.

[0052] Two plug-flow agitators are installed at opposite corners of the anoxic tank. The plug-flow agitators can more effectively adjust the materials in the anoxic tank, maintain a uniform mixing of sludge and water, avoid sludge sedimentation, improve mixing efficiency, create an anoxic environment, and increase anoxic residence time.

[0053] In the specific implementation, the sewage flows by gravity to the basket screen, which can intercept larger solid waste, and is then pumped to the anoxic tank by a lifting pump. In the anoxic environment, polyphosphate bacteria decompose organic matter through fermentation, and use the energy generated by this process to absorb and store phosphates in the body. At the same time, in order to maintain energy balance, polyphosphate bacteria will decompose the polyphosphates in the body and release soluble phosphates into the environment, and then flow into the multifunctional tank. An aeration device is provided at the bottom of the multifunctional tank, which can be adjusted to an anoxic tank or an aerobic tank as needed, and then flow into the aerobic tank. In the aerobic tank, organic matter is degraded through nitrification reaction and phosphorus is absorbed. Then it flows into the membrane tank to remove SS in the sewage and enters the inclined tube sedimentation tank. After sedimentation, the bottom sludge enters the sludge tank and the clean water enters the clear water tank. The water in the clear water tank can be discharged after being disinfected with sodium hypochlorite.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rural sewage treatment system, characterized by: It includes a grid well, anoxic tank, multifunctional tank, aerobic tank, membrane tank and sedimentation tank connected in sequence. The front end of the grid well is provided with a water inlet pipeline, the rear end of the sedimentation tank is provided with a clear water tank and a sludge tank, and the rear end of the clear water tank is provided with a water outlet pipeline. A first reflux pipeline (1) is provided between the membrane pool and the multifunctional pool, and a second reflux pipeline (2) is provided between the membrane pool and the inlet pipeline of the anoxic pool; A first sludge pipeline (3) is provided between the membrane tank and the sludge tank, and a second sludge pipeline (4) is provided between the sedimentation tank and the sludge tank.

2. A rural sewage treatment system according to claim 1, characterized in that: The anoxic pool and the multifunctional pool are both provided with a pharmaceutical dosing pipeline (5).

3. A rural sewage treatment system according to claim 2, characterized in that: The agent is a carbon source.

4. A rural sewage treatment system according to claim 1, characterized in that: The aerobic tank is connected to a first blower, and the membrane tank is connected to a second blower.

5. A rural sewage treatment system according to claim 1, characterized in that: The sedimentation tank is connected to a PAC dosing pipeline (6), and the sedimentation tank is an inclined tube sedimentation tank.

6. A rural sewage treatment system according to claim 1, characterized in that: A lifting pump is provided between the grid well and the anoxic pool.

7. A rural sewage treatment system according to claim 1, characterized in that: The water outlet pipeline is connected to a sodium hypochlorite dosing pipeline (7).

8. A rural sewage treatment system according to claim 1, characterized in that: The multifunctional pool is an anoxic pool or an aerobic pool.

9. A rural sewage treatment system according to claim 1, characterized in that: Aeration devices are provided at the bottom of the multifunctional pool, aerobic pool and membrane pool.

10. A rural sewage treatment system according to claim 1, characterized in that: Two plug flow agitators are provided at the opposite corners of the anoxic tank.

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