Rural sewage purification system

Abstract

The present application provides a kind of rural sewage purification system, it is related to wastewater treatment technical field.The rural sewage purification system includes anoxic purification module, oxygen-consuming purification module, circulation lifting component, skimming water component and drug purification module, the anoxic purification module with the oxygen-consuming purification module is communicated, the drug purification module is set in the downstream side of the oxygen-consuming purification module, the skimming water component can transport water in the oxygen-consuming purification module to the drug purification module, the oxygen-consuming purification module and the anoxic purification module are connected by the circulation lifting component.The rural sewage purification system of the present application can solve the problem that the activated sludge in the existing rural sewage purification system is difficult to maintain in the sewage purification system, which leads to the problem that the rural sewage purification system is difficult to maintain the treatment effect of microorganism for a long time.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and in particular to a rural wastewater purification system. Background Technology

[0002] Rural areas typically have relatively small volumes of wastewater, making the construction of large-scale wastewater treatment plants a waste of resources. Furthermore, the construction and operating costs of large-scale wastewater treatment plants are extremely high, making them unsuitable for rural wastewater treatment.

[0003] Based on this, rural wastewater treatment systems specifically designed for rural sewage began to emerge. These systems typically operate with simultaneous influent and effluent flow; wastewater enters the system through the inlet, is treated, and then discharged directly through the outlet. However, during the outflow of treated water, the water carries away the activated sludge from the system, making it difficult to retain the activated sludge within the system and hindering the long-term effectiveness of the microbial treatment process. Summary of the Invention

[0004] In view of this, this application provides a rural sewage purification system to solve the problem that activated sludge in existing rural sewage purification systems is difficult to maintain within the system, resulting in the inability to maintain the long-term treatment effect of microorganisms in the rural sewage purification system.

[0005] This application provides a rural sewage purification system, which includes an anoxic purification module, an oxygen-consuming purification module, a circulation lifting component, a skimming component, and a chemical purification module. The anoxic purification module is connected to the oxygen-consuming purification module, and the chemical purification module is located downstream of the oxygen-consuming purification module. The skimming component can transport water from the oxygen-consuming purification module to the chemical purification module. The oxygen-consuming purification module and the anoxic purification module are connected through the circulation lifting component.

[0006] Preferably, the rural sewage purification system includes multiple anoxic purification modules and multiple oxygen-consuming purification modules, wherein the multiple anoxic purification modules are connected in series, the multiple oxygen-consuming purification modules are connected in series, the anoxic purification module at the end is connected to the oxygen-consuming purification module at the beginning, the skimming component transports the water in the oxygen-consuming purification module at the end to the drug purification module, and the oxygen-consuming purification module at the end is connected to the anoxic purification module at the beginning through the circulation lifting component.

[0007] Preferably, the skimming component includes a water intake mechanism and a receiving mechanism. The water intake mechanism can transport water from the oxygen-consuming purification module to the receiving mechanism, and the receiving mechanism is connected to the drug purification module.

[0008] Preferably, the anoxic purification module includes an anoxic pool and an anoxic stirring assembly. One end of the anoxic stirring assembly is connected to a stirring gas source, and the other end of the anoxic stirring assembly extends below the liquid surface in the anoxic pool. At least one of the anoxic purification modules has a carbon source replenishment assembly to add external carbon source replenishment liquid to the anoxic pool included in the anoxic purification module.

[0009] Preferably, the oxygen-consuming purification module includes an oxygen-consuming tank, a microporous aeration component, and a vortex aeration component. Both the microporous aeration component and the vortex aeration component are connected to an aeration air source, and both extend to below the liquid surface of the oxygen-consuming tank.

[0010] Preferably, the drug purification module includes a dosing tank, a water purification tank, and a dosing component. The skimming component can transport water from the oxygen-consuming purification module to the dosing tank. The dosing component is located on one side of the dosing tank to add drug solution to the dosing tank. The dosing tank is connected to the water purification tank.

[0011] Preferably, the drug purification module further includes a guiding component and a separating component. Both the separating component and the guiding component are fixed inside the water purification tank. The guiding component is located above the separating component and is connected to the dosing tank. The separating component can separate the sludge to be settled and the water passing through the separating component in opposite directions.

[0012] Preferably, the rural sewage purification system further includes a sludge storage module and a sludge discharge component. The sludge storage module is connected to the circulation lifting component, and the bottom of the water purification tank is connected to the sludge storage module through the sludge discharge component.

[0013] Preferably, the rural sewage purification system further includes an inlet module, which includes an inlet pool and a flow guiding component. The inlet pool is connected to the sewage source, and the flow guiding component is disposed inside the inlet pool. The flow guiding component can transport the water in the inlet pool to the anoxic purification module.

[0014] Preferably, the water inlet module further includes a water inlet stirring assembly, one end of which is connected to the stirring air source, and the other end of which extends below the liquid surface of the water inlet pool.

[0015] In the rural wastewater treatment system of this application, the anoxic purification module and the aerobic purification module are connected. Wastewater enters the aerobic purification module through the anoxic purification module, where the activated sludge treats the incoming wastewater. The aerobic and anoxic purification modules are back-mixed through a circulation lifting component, allowing the multiphase mixture of activated sludge and wastewater in the aerobic purification module to flow back into the anoxic purification module, thus repeating the cycle. After the aerobic and anoxic purification modules have operated for a predetermined time, the circulation lifting component stops working, allowing the activated sludge to settle for a period of time. Then, the supernatant from the aerobic purification module is transported to the chemical purification module through a skimming component, where it is treated and then flows out. In this way, the activated sludge circulates between the aerobic and anoxic purification modules, and the supernatant from the aerobic purification module is transported to the chemical purification module through the skimming component. This eliminates the risk of activated sludge loss and improves the long-term effectiveness of the microbial treatment in the rural wastewater treatment system. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of a rural wastewater purification system according to an embodiment of the present invention is shown;

[0018] Figure 2 A schematic diagram of the oxygen-consuming purification module located at the end is shown;

[0019] Figure 3 A schematic diagram of the water inlet agitator is shown.

[0020] Figure 4 A schematic diagram of the skimming component is shown;

[0021] Figure 5 A schematic diagram of the water diversion mechanism is shown;

[0022] Figure 6 A schematic diagram of the accommodating structure is shown;

[0023] Figure 7 A schematic diagram of the support mechanism is shown;

[0024] Figure 8 A schematic diagram of the tension limiting assembly is shown.

[0025] Figure 9A schematic diagram of the drug purification module is shown.

[0026] Icons: 1-Inlet module; 11-Inlet tank; 12-Inlet pipe; 13-Flow guide assembly; 131-Flow guide pipeline; 132-First submersible sewage pump group; 14-First float switch; 15-Inlet stirring pipe; 16-Inlet stirring component; 161-External ring sleeve; 1611-First outlet orifice; 162-Internal pipe; 1621-Second outlet orifice; 17-Inlet stirring control valve; 18-First flow meter; 2-Anoxic purification module; 21-Anoxic tank; 22-Second float switch; 23-Anoxic stirring air inlet pipe; 24-Anoxic stirring component; 25-Anoxic stirring control valve; 26-Stirring connecting pipe; 27-Carbon source replenishment assembly; 271-Replenishment pipeline; 27 2-Carbon source replenishment control valve; 273-Carbon source replenishment component; 28-Third pressure detector; 29-Agitator and air supply valve; 3-Oxygen-consuming purification module; 31-Oxygen-consuming tank; 32-Microporous aeration component; 321-First aeration pipe; 322-Microporous membrane aerator; 33-Vortex aeration component; 331-Vortex diffuser aerator; 332-Second aeration pipe; 333-Vortex aeration valve; 34-Connecting pipe; 35-First aeration and air supply valve; 36-Installation pipe; 37-Second aeration and air supply valve; 38-Second pressure detector; 39-Second flow meter; 4-Drug purification module; 41-Dosing tank; 42-Clean water tank; 43-Dosing component; 431-Containing tank; 4 32-Dosing and delivery pipeline; 44-Aerator; 45-Guiding assembly; 451-Buffer cylinder; 452-Guiding pipe; 46-Separation assembly; 47-Aeration pipeline; 48-Dosing and aeration valve; 5-Skimming assembly; 51-Water intake mechanism; 511-Pneumatic lift pump; 512-Lifting pipe; 513-Water injection pipe; 52-Containing mechanism; 521-Float ejector; 522-Skimming inner tank; 523-Connecting slide bar; 524-Flexible outlet component; 525-Sliding hole; 526-Skimming valve; 53-Pull-limiting assembly; 531-Pull steel wire rope; 532-Pulley component; 533-Limiting buckle component; 534-Fixing component; 54-Supporting mechanism; 541-Water 542-Vertical collar pipe; 61-Agitating air source; 62-Aeration air source; 63-Transfer pipe; 64-Transfer valve; 65-Flow pipe; 66-Third flow meter; 67-First pressure detector; 7-Circulation lifting assembly; 71-Second submersible pump set; 72-Transfer pipe set; 721-First connecting pipe; 722-Second connecting pipe; 723-Third connecting pipe; 724-First transfer valve; 725-Second transfer valve; 81-Sludge storage module; 811-Storage tank; 812-Swirl mixing and micro-aeration oxygenation component; 813-Oxygenation pipe; 814-Oxygenation valve; 9-Sludge discharge assembly; 91-Sludge discharge pump; 92-Sludge discharge pipeline; 93-Sludge discharge control valve. Detailed Implementation

[0027] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0028] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0029] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0030] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0031] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0032] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0033] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0034] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0035] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0036] This application provides a rural sewage purification system, such as Figure 1As shown, the rural wastewater purification system includes anoxic purification module 2, oxygen-consuming purification module 3, a circulation lifting component 7, a skimming component 5, and a chemical purification module 4. Anoxic purification module 2 is connected to oxygen-consuming purification module 3. The chemical purification module 4 is located downstream of oxygen-consuming purification module 3. The skimming component 5 transports water from oxygen-consuming purification module 3 to chemical purification module 4. Oxygen-consuming purification module 3 and anoxic purification module 2 are back-mixed connected via the circulation lifting component 7. In this rural wastewater purification system, anoxic purification module 2 and oxygen-consuming purification module 3 are connected. Wastewater enters oxygen-consuming purification module 3 through anoxic purification module 2. The activated sludge in both modules treats the incoming wastewater. The back-mixing connection between oxygen-consuming purification module 3 and anoxic purification module 2 via the circulation lifting component 7 allows the multiphase mixture composed of activated sludge and wastewater in oxygen-consuming purification module 3 to flow back into anoxic purification module 2, thus creating a continuous cycle. After the aerobic purification module 3 and the anoxic purification module 2 have operated for a predetermined period, the circulation lifting component 7 stops working and allows the activated sludge to settle for a period of time. Then, the supernatant from the aerobic purification module 3 is transported to the chemical purification module 4 via the skimming component 5, where it is treated and then flows out. In this way, the activated sludge circulates between the aerobic purification module 3 and the anoxic purification module 2, and the supernatant from the aerobic purification module 3 is transported to the chemical purification module 4 via the skimming component 5. This eliminates the risk of activated sludge loss and improves the long-term effectiveness of microbial treatment in the rural wastewater treatment system.

[0037] like Figure 1 As shown, the rural sewage purification system includes an inlet module 1, which receives sewage from the pretreatment stage. The inlet module 1 includes an inlet tank 11 and an inlet pipe 12. The inlet pipe 12 is connected to the interior of the inlet tank 11, allowing sewage to enter the inlet tank 11 via the inlet pipe 12. A flow guiding component 13 is installed inside the inlet tank 11. A portion of the flow guiding component 13 extends below the surface of the sewage in the inlet tank 11 and guides the sewage in the inlet tank 11 to the downstream anoxic purification module 2. The flow guiding component 13 includes a flow guiding pipe 131 and a first submersible pump group 132. One end of the flow guiding pipe 131 is connected to the first submersible pump group 132, and the other end of the flow guiding pipe 131 is connected to the anoxic purification module 2. The first submersible pump group 132 is located below the surface of the sewage in the inlet tank 11. When the first submersible sewage pump group 132 is working, the sewage in the inlet pool 11 can enter the oxygen-deficient purification module 2 through the diversion pipe 131.

[0038] Furthermore, the water inlet module 1 also includes a first float switch 14, which is used to detect the level of sewage in the water inlet pool 11. The first float switch 14 is connected to the controller of the rural sewage purification system. When the liquid level in the water inlet pool 11 is low, the operation of the submersible pump in the first submersible pump group 132 in the flow guide assembly 13 can be reduced, and when the liquid level is high, the operation of the submersible pump in the first submersible pump group 132 in the flow guide assembly 13 can be increased.

[0039] In addition, the water inlet module 1 also includes a water inlet mixing assembly, which includes a water inlet mixing pipe 15, a water inlet mixing element 16, and a water inlet mixing control valve 17. One end of the water inlet mixing pipe 15 is connected to the mixing air source 61, and the other end of the water inlet mixing pipe 15 is connected to the water inlet mixing element 16. The water inlet mixing control valve 17 is installed on the water inlet mixing pipe 15. The aeration air source 62 can also supply excess gas to the water inlet mixing element 16 through the water inlet mixing pipe 15 to mix the sewage in the water inlet tank 11.

[0040] Optionally, such as Figure 3 As shown, the water inlet agitator 16 includes an outer ring sleeve 161 and an inner tube 162. The outer diameter of the outer ring sleeve 161 is 1.0 to 3.0 times the outer diameter of the inner tube 162, and the inner tube 162 is nested inside the outer ring sleeve 161. The outer ring sleeve 161 has a hollow structure, and a circular hole is opened in the vertical section at the beginning of the outer ring sleeve 161 to ensure that the inner tube 162 can be nested and inserted into the outer ring sleeve 161. The outer ring sleeve 161 and the inner tube 162 can be welded and fixed. The vertical section at the end of the outer ring sleeve 161 is blocked. The outer ring sleeve 161 has first outlet holes 1611 regularly distributed at regular intervals in the horizontal length direction of the ring tube section. The diameter of the first outlet holes 1611 can be 5mm-8mm. The built-in pipe 162 has a hollow structure. Its first end is connected to the inlet stirring pipe 15, and its end is sealed vertically. The built-in pipe 162 has regularly spaced second outlet holes 1621 along its horizontal length. The diameter of the second outlet holes 1621 can be 5mm-8mm. The center of the second outlet hole 1621 and the center of the first outlet hole 1611 are appropriately staggered in the vertical direction of the corresponding outer ring pipe 161 and built-in pipe 162 to enhance cross-flow disturbance and energy dissipation. Thus, gas can enter the wastewater through the inlet stirring pipe 15, built-in pipe 162, second outlet hole 1621, outer ring pipe 161, and first outlet hole 1611. The inlet stirring assembly can stir the wastewater in the inlet tank 11 to facilitate subsequent wastewater treatment.

[0041] In the embodiments of this application, the anoxic purification module 2 can perform anoxic denitrification and anaerobic biological phosphorus release functions, such as... Figure 1As shown, there can be multiple anoxic purification modules 2 connected in series. The first anoxic purification module 2 is connected to the inlet water module 1, and a second float switch 22 is installed inside the first anoxic purification module 2. The last anoxic purification module 2 is connected to the downstream oxygen-consuming purification module 3. The anoxic purification module 2 includes an anoxic tank 21 and an anoxic stirring assembly. The anoxic stirring assembly includes an anoxic stirring air inlet pipe 23 and an anoxic stirring element 24 connected together. One end of the anoxic stirring air inlet pipe 23 extends below the sewage surface in the anoxic tank 21 and is connected to the anoxic stirring element 24. The other end of the anoxic stirring air inlet pipe 23 is connected to the stirring air source 61. An anoxic stirring control valve 25 is installed on the anoxic stirring air inlet pipe 23. The structure of the anoxic stirring element 24 is the same as that of the inlet water stirring element 16, and will not be described again here. The anoxic stirring component enables molecular Brownian motion collisions and physical spatial isolation of gas within the interlayer of the outer ring sleeve 161 and the inner tube 162, thereby achieving a better energy dissipation and oxygen removal effect. This suppresses turbulence within the tube and effectively removes air or oxygen from the multiphase mixture of sewage and activated sludge, reducing the levels of DO (Dissolved Oxygen) and ORP (Oxidation-Reduction Potential) in the sewage.

[0042] Optionally, the water inlet stirring pipe 15 and the oxygen-deficient stirring air inlet pipe 23 are connected to the stirring air source 61 through the stirring connecting pipe 26, and the stirring connecting pipe 26 is equipped with a stirring air supply valve 29.

[0043] Optionally, the circulating lifting component 7 is connected to the anoxic purification module 2 located at the first end to lift the multiphase mixture of activated sludge and wastewater in the aerobic purification module 3 to the anoxic purification module 2 located at the first end. Figure 1 As shown, the anoxic purification module 2 at the end also includes a carbon source replenishment component 27. The carbon source replenishment component 27 includes a replenishment pipe 271, a carbon source replenishment control valve 272, and a carbon source replenishment part 273. The carbon source replenishment part 273 contains an external carbon source replenishment liquid. The upper end of the replenishment pipe 271 is connected to the carbon source replenishment part 273, and the lower end of the replenishment pipe 271 is lower than the lower end of the preset adjustable minimum liquid level of the sewage in the anoxic tank 21, so that the lower end of the replenishment pipe 271 extends into the multiphase mixture of sewage and activated sludge in the anoxic tank 21 to add external carbon source replenishment liquid to the multiphase mixture of sewage and activated sludge in the anoxic tank 21.

[0044] In the embodiments of this application, such as Figure 1As shown, there can be more than one oxygen-consuming purification module 3, and the multiple oxygen-consuming purification modules 3 are connected in series. The oxygen-consuming purification module 3 at the first end is connected to the oxygen-deficient purification module 2 at the end. The oxygen-consuming purification module 3 mainly utilizes autotrophic or heterotrophic aerobic microorganisms such as AOBs (ammonia-oxidizing bacteria), NOBs (nitrifying or nitrifying bacteria), and PAOs (polyphosphate-accumulating bacteria) to perform biochemical functions such as oxygen-consuming removal of organic pollutants and ammonia nitrogen, and aerobic phosphorus uptake. The oxygen-consuming purification module 3 includes an oxygen-consuming tank 31, a microporous aeration component 32, and a vortex aeration component 33. The microporous aeration component 32 includes a first aeration pipe 321 and a microporous membrane aerator 322 (including but not limited to tubular membrane type, disc type, or diffuser type). One end of the first aeration pipe 321 is connected to the aeration air source 62 through a connecting pipe 34, and the other end of the first aeration pipe 321 extends to the bottom of the oxygen-consuming tank 31. A portion of the first aeration pipe 321 extends along the bottom of the oxygen-consuming tank 31. The microporous membrane aerator 322 is installed on the horizontally extending portion of the first aeration pipe 321. A first aeration valve is installed on the connecting pipe 34. The vortex aeration assembly 33 includes a vortex diffuser aerator 331, a second aeration pipe 332, and a vortex aeration valve 333. One end of the second aeration pipe 332 is connected to a connecting pipe 34, and the other end of the second aeration pipe 332 is connected to the vortex diffuser aerator 331. The vortex diffuser aerator 331 is located below the preset adjustable minimum liquid level of the oxygen-consuming tank 31. The three connecting pipes 34 in the three oxygen-consuming purification modules 3 are connected to the same aeration air source 62 through an installation pipe 36. A first aeration air supply valve 35 is provided on the connecting pipe 34, and a second aeration air supply valve 37 is provided on the installation pipe 36.

[0045] Furthermore, such as Figure 1 and Figure 2 As shown, the circulation lifting component 7 is installed in the oxygen-consuming purification module 3 at the end. The circulation lifting component 7 includes a second submersible pump group 71 and a conveying pipe group 72. The second submersible pump group 71 is located below the preset adjustable minimum liquid level of the oxygen-consuming tank 31. The second submersible pump group 71 is connected to the anoxic purification module 2 at the beginning through the conveying pipe group 72 to transport the multiphase mixture of sewage and activated sludge in the oxygen-consuming purification module 3 to the anoxic purification module 2 at the beginning, so as to eliminate the loss of activated sludge.

[0046] Optionally, the rural wastewater purification system also includes a sludge storage module 81, which is connected to the circulation lifting component 7. When the concentration of activated sludge circulating in the anoxic purification module 2 and the oxygen-consuming purification module 3 exceeds a predetermined value, the excess activated sludge can be transported to the sludge storage module 81 for storage, so as to regulate the sludge measurement demand in the anoxic purification module 2 and the oxygen-consuming purification module 3.

[0047] Optionally, the conveying pipe assembly 72 includes a first connecting pipe 721, a second connecting pipe 722, a third connecting pipe 723, a first conveying valve 724, and a second conveying valve 725. One end of the first connecting pipe 721 is connected to the submersible pump assembly, and the other end of the first connecting pipe 721 is connected to the second connecting pipe 722 and the third connecting pipe 723 respectively. The end of the second connecting pipe 722 away from the first connecting pipe 721 extends into the anoxic tank 21 of the anoxic purification module 2 located at the first end. The end of the third connecting pipe 723 away from the first connecting pipe 721 extends into the sludge storage module 81. The first conveying valve 724 and the second conveying valve 725 are respectively provided on the second connecting pipe 722 and the third connecting pipe 723. The first conveying valve 724 and the second conveying valve 725 can be manual control valves, electric control valves, or solenoid valves.

[0048] Preferably, there are two oxygen-deficient purification modules 2 and three oxygen-consuming purification modules 3. The second oxygen-deficient purification module 2 is equipped with a carbon source replenishment component 27, and the third oxygen-consuming purification module 3 is equipped with a skimming component 5.

[0049] Optionally, the hydraulic residence time of a single cell (unit) of the oxygen-consuming purification module 3 is generally 2.5 to 6 hours, and the hydraulic residence time of a single cell (unit) of the oxygen-deficient purification module 2 is generally 1.5 to 3 hours.

[0050] like Figure 9 As shown, the sludge storage module 81 includes a storage tank 811, a vortex mixing and micro-aeration oxygenation component 812, and an oxygenation pipe 813. The storage tank 811, the water purification tank 42, and the chemical dosing tank 41 can be constructed together, with the storage tank 811 located above the water purification tank 42. The vortex mixing and micro-aeration oxygenation component 812 is installed inside the storage tank 811 and is connected to the stirring air source 61 via the oxygenation pipe 813. It can adopt an intermittent pulse or continuous start-stop mode to avoid the anaerobic environment caused by low oxygen content in the storage tank 811, thereby preventing the activated sludge from anaerobicly releasing phosphorus or decomposing in the storage tank 811 and producing malodorous, toxic, or harmful gases such as hydrogen sulfide. An oxygenation valve 814 is installed on the oxygenation pipe 813.

[0051] In addition, the oxygen-consuming tank 31 can be connected to the anoxic tank 21, the anoxic tank 21 to the anoxic tank 21, and the oxygen-consuming tank 31 to the oxygen-consuming tank 31 through the flow pipe 65. The rural sewage purification system includes multiple modules, which facilitates independent processing, transportation and flexible installation of each module. The stirring or aeration reaction is completed efficiently in the independent module, which also avoids the limitations of the traditional completely mixed system, which is prone to activated sludge expansion, uneven flow in the stirring or aeration space and the formation of sedimentation dead corners when building a large cell.

[0052] In the embodiments of this application, such as Figure 1 , Figure 2 and Figure 4As shown, the skimming component 5 is installed in the oxygen-consuming purification module 3 at the end to transport the biochemically treated water in the oxygen-consuming purification module 3 to the drug purification module 4. The skimming component 5 includes a water-guiding mechanism 51 and a receiving mechanism 52. The water-guiding mechanism 51 can transport the supernatant formed after settling in the oxygen-consuming purification module 3 to the receiving mechanism 52. The receiving mechanism 52 is connected to the drug purification module 4 to transport the biochemically treated water to the drug purification module 4.

[0053] like Figure 6 As shown, the receiving mechanism 52 includes two float-mounted water-lifting components 521, a skimming inner tank 522, a connecting slide bar 523, and a flexible water outlet component 524. The two float-mounted water-lifting components 521 are connected to the skimming inner tank 522 via the connecting slide bar 523, and are symmetrically arranged relative to the skimming inner tank 522. The float-mounted water-lifting components 521 can serve as buoyancy adjustment support blocks. By setting the float-mounted water-lifting components 521, the buoyancy and gravity balance of the receiving mechanism 52 can be adjusted to control its submersion depth, thereby preventing the skimming inner tank 522 from tipping over. The flexible water outlet component 524 is connected to the bottom of the skimming inner tank 522, allowing the skimming inner tank 522 to integrate water filling and skimming functions. The skimming inner tank 522 is a flow-through decanting component for discharging treated water. The upper section of the inner skimming tank 522 is open, and a horizontal lifting rod is provided on the section for easy connection with the traction steel wire rope 531 described below. The lower section of the inner skimming tank 522 is closed and has a connection port. The flexible water outlet 524 is connected to the connection port, and a skimming valve 526 is provided on the flexible water outlet 524. The end of the flexible water outlet 524 away from the connection port is connected to the drug purification module 4 through a sleeve. The flexible water outlet 524 can be a flexible and expandable pipe, and the skimming valve 526 can be a manual control valve, an electric control valve, or an electromagnetic control valve.

[0054] Optionally, there are four connecting slide rods 523. Each float water-lifting component 521 is connected to the skimming inner bucket 522 through two connecting slide rods 523. Each connecting slide rod 523 has a sliding hole 525. The sliding holes 525 on the two connecting slide rods 523 connected to the same float water-lifting component 521 are positioned correspondingly, so that the two sliding holes 525 on the two connecting slide rods 523 connected to the same float water-lifting component 521 can be passed through the same vertical collar tube 542 in the support mechanism 54, thereby guiding the up and down movement of the receiving mechanism 52 to prevent the skimming inner bucket 522 from tipping over.

[0055] like Figure 4 and Figure 5As shown, the water intake mechanism 51 includes a pneumatic booster pump 511, a lift pipe 512, and a water injection pipe 513. One end of the lift pipe 512 is connected to the pneumatic booster pump 511, and the other end is connected to the water injection pipe 513. One end of the water injection pipe 513 can extend below the liquid surface of the aerobic tank 31, and the other end extends into the skimming inner tank 522 to inject water into the interior of the skimming inner tank 522. The water injection pipe 513 can be a flexible telescopic pipe, and it can draw water when the liquid level in the aerobic tank 31 is between the preset adjustable maximum liquid level and the minimum liquid level.

[0056] In addition, the skimming assembly 5 also includes a tension limiting assembly 53, such as Figure 8 As shown, the traction limiting assembly 53 includes a traction steel wire rope 531, a pulley 532, a limiting buckle 533, and a fixing member 534. One end of the traction steel wire rope 531 is connected to the limiting buckle 533, and the other end of the traction steel wire rope 531 is connected to the horizontal lifting rod of the inner skimming tank 522. The fixing member 534 has a connecting hole through which the traction steel wire rope 531 passes. When the inner skimming tank 522 slowly descends due to the skimming action, it can be pulled and tractioned by the traction steel wire rope 531. When the fixing member 534 abuts against the limiting buckle 533, the limiting buckle 533 cannot continue to rise. At this time, the inner skimming tank 522 no longer descends, thereby constraining the final descent position of the inner skimming tank 522, thus ensuring that when the skimming tank 522 finishes skimming, the liquid level in the oxygen-consuming tank 31 is close to the preset adjustable minimum liquid level.

[0057] Optionally, the skimming assembly 5 also includes a support mechanism 54, such as Figure 7 As shown, the support mechanism 54 includes a horizontal connector 541 and two vertical collar tubes 542. The horizontal connector 541 is fixed to the inner wall of the aerobic tank 31, and both vertical collar tubes 542 are connected to the horizontal connector 541. The outer diameter of the vertical collar tubes 542 is smaller than the diameter of the sliding hole 525, allowing the vertical collar to pass through the sliding hole 525. The sliding holes 525 on the two connecting slide rods 523 located on the same side are passed through by the same vertical collar tube 542. During skimming, the liquid level in the aerobic tank 31 drops, and the receiving mechanism 52 moves along the vertical collar tubes 542, thereby preventing the skimming inner tank 522 from tipping over. During the skimming process, the liquid level in the oxygen-consuming tank 31 and the anoxic tank 21 gradually decreases from the preset adjustable maximum liquid level to the preset adjustable minimum liquid level. When water is introduced into the oxygen-consuming tank 31 and the anoxic tank 21, the liquid level in the oxygen-consuming tank 31 and the anoxic tank 21 gradually increases from the preset adjustable minimum liquid level to the preset adjustable maximum liquid level.

[0058] Optionally, the length of the 542 vertical collar tubes can be 1.2 to 1.5 m.

[0059] In the embodiments of this application, such as Figure 1 and Figure 9 As shown, the drug purification module 4 includes a dosing tank 41, a purified water tank 42, and a dosing assembly 43. A skimming assembly 5 transports the upper clear liquid from the oxygen-consuming purification module 3 to the dosing tank 41. The dosing assembly 43 is located on one side of the dosing tank 41, which is connected to the purified water tank 42. The dosing assembly 43 includes a receiving tank 431, a dosing delivery pipeline 432, and a dosing pump located inside the receiving tank 431 (e.g., the dosing pump can be fixed to the top of the receiving tank 431 or hung on the side wall of the receiving tank 431). The receiving tank 431 contains a drug solution with chemical phosphorus removal and flocculation effects. One end of the dosing delivery pipeline 432 is connected to the dosing pump, and the other end extends into the dosing tank 41 to add the drug solution to the water entering the dosing tank 41, thereby removing phosphorus and flocculating the water in the dosing tank. An aerator 44 is installed in the dosing tank 41. The aerator 44 is connected to the mixing air source 61 and the aeration air source 62 through the aeration pipe 47. The aerator 44 can be a swirling and diffused aerator. A dosing aeration valve 48 is installed on the aeration pipe 47.

[0060] Furthermore, such as Figure 9 As shown, the drug purification module 4 also includes a guiding component 45 and a separating component 46. Both the separating component 45 and the guiding component 46 are fixed inside the water purification tank 42. The guiding component 45 is located above the separating component 46 and is connected to the dosing tank 41. The guiding component 45 includes a buffer cylinder 451 and a guide pipe 452. One end of the guide pipe 452 is connected to the dosing tank 41, and the other end is connected to the buffer cylinder 451. The buffer cylinder 451 is funnel-shaped. The inner diameter of the upper part of the buffer cylinder 451 remains unchanged, while the inner diameter of the lower part of the buffer cylinder 451 increases from top to bottom, thereby ensuring that the water flow is a near-uniform velocity flow in the upper part of the buffer cylinder 451 and a gradually decreasing velocity flow in the lower part. The separating component 46 includes multiple separation plates stacked on top of each other. The separation plates are hinged to the inner wall of the water purification tank 42 and are provided with a top limiting mesh sleeve and a bottom support member at the top and bottom positions, respectively. Because of the density difference between the sludge to be settled and the water, the separation component 46 can separate the sludge to be settled and the water flowing through the separation component 46 in opposite directions. When the sludge to be settled and the water pass through the separation component 46, the suspended flocs pass through the stacked separation plates and enter the cone-shaped space at the lower end of the separation component 46. They are periodically transported to the sludge storage module 81 through the sludge discharge component 9. The clear liquid after the suspended solids and flocs are removed flows out through the water outlet pipe of the water purification tank 42 located above the separation component 46.

[0061] Optionally, the sludge discharge assembly 9 includes a sludge discharge pump 91, a sludge discharge pipeline 92, and a sludge discharge control valve 93. One end of the sludge discharge pipeline 92 is connected to the bottom of the water purification tank 42, and the other end of the sludge discharge pipeline 92 is connected to the sludge storage assembly. The sludge discharge control valve 93 is installed on the sludge discharge pipeline 92.

[0062] In addition, such as Figure 1 As shown, the mixing air source 61 and the aeration air source 62 can be connected via a transfer pipe 63. A transfer valve 64 is installed on the transfer pipe 63, allowing the mixing air source 61 and the aeration air source 62 to form a backup system for flexible operation. In the event of a failure of the mixing air source 61, the transfer valve 64 can be opened, enabling the aeration air source 62 to supply air to the mixing components connected to the mixing air source 61, thus ensuring the continuous operation of the rural wastewater purification system.

[0063] In the embodiments of this application, the rural sewage purification system includes a first pressure detector 67, a second pressure detector 38, and a third pressure detector 28. The first pressure detector 67 is installed at the branch point where the aeration air source 62 supplies air to three connecting pipes 34. A second pressure detector 38 is installed on each connecting pipe 34. The third pressure detector 28 is installed at the branch point where the stirring air source 61 supplies air to two anoxic stirring components. The first pressure detector 67, the second pressure detector 38, and the third pressure detector 28 can monitor the air pressure on their respective pipelines, ensuring minimum pressure requirements and regulating the air pressure balance on each pipeline.

[0064] In addition, a first flow meter 18 is installed on the diversion pipe 131 to detect the amount of sewage Q1 supplied to the aerobic purification module 3 and the anoxic purification module 2. A second flow meter 39 is installed on the installation pipe 36 to detect the amount of gas Q2 supplied by the aeration air source 62 to the three aerobic purification modules 3. A third flow meter 66 is installed on the circulation lifting assembly 7 to detect the amount Q3 of the mixed liquor of returned activated sludge and sewage. When the rural sewage purification system is running, the value of Q2 / Q1 (air volume / water volume ratio) should be maintained at 15-80, and the value of Q3 / Q1 (sludge volume / water volume ratio) should be maintained at 30%-200% to ensure the effectiveness of the rural sludge purification system in sewage treatment.

[0065] In the operation of the rural sludge purification system of this application, only static sedimentation is a non-reactive process, while all others are reactive processes. The rural sludge purification system of this application adopts a coupled operation of reactive and non-reactive processes, namely, the sequential operation of water influent, stirring, aeration, reflux, denitrification, static sedimentation, skimming, and phosphorus removal. Specifically, water influent, stirring, aeration, reflux, and denitrification can be carried out in the first time segment, and the duration of each of these processes can vary. After the first time segment is completed, static sedimentation occurs in the second time segment. After the second time segment is completed, skimming and phosphorus removal are carried out in the third time segment. The duration of each of the first, second, and third time segments can be preset and adjusted from 0 to 180 minutes. Taking the first time segment as 0-60 minutes as an example, the operation flow of the rural wastewater purification system of this application is as follows:

[0066] (1) Water intake operation: Water is introduced into the water intake pool 11 through the water intake pipe 12, and the liquid level is detected by the first float switch 14 and the second float switch 22. When the second float switch 22 detects that the liquid level in the anoxic pool 21 has reached the preset adjustable maximum liquid level, the water intake into the water intake pipe 12 is stopped.

[0067] (2) Stirring operation: Stirring air source 61 is started, and stirring air supply valve 29 is opened 0-30 seconds in advance; while water inlet stirring control valve 17 and anoxic stirring control valve 25 are in normally open mode, thus realizing the fluidization stirring function of multiphase media in water inlet tank 11 and anoxic tank 21. The termination time of stirring operation can be flexibly set within the first time segment. Stirring operation does not have to continue for the entire first time segment, and stirring operation can end early.

[0068] (3) Oxygenation Operation: When the aeration gas source 62 is started, the corresponding second aeration gas supply valve 37 opens 0-30 seconds in advance, and the first aeration gas supply valve 35 and connecting pipe 34 are in the normally open mode, thus realizing the aeration and oxygenation function for the multiphase media in the three oxygen-consuming tanks 31. The start time of the aeration and oxygenation operation within a single batch cycle can be flexibly set within the first time segment, and the oxygenation operation can start relatively later than the stirring operation.

[0069] (4) Recirculation Operation: The second submersible pump group 71 is started, the first conveying valve 724 is opened 0-30 seconds in advance, while the second conveying valve 725 is normally closed and is only opened briefly during short-term sludge discharge operations to achieve nitrification sludge liquid recirculation. The termination time of the recirculation operation within a single batch cycle can be flexibly set within the first time segment. The recirculation operation does not have to continue for the entire first time segment, and the stirring operation can be ended early.

[0070] (5) Denitrification dosing operation: Based on the external carbon source requirements of the process, external carbon source supplement liquid is added to the anoxic tank 21 through the carbon source supplement component 27 to improve denitrification efficiency. The termination time of the denitrification dosing operation within a single batch cycle can be flexibly set within the first time segment. The denitrification dosing operation does not have to continue for the entire first time segment, and the stirring operation can be ended early;

[0071] (6) Static sedimentation state: The aforementioned water inlet, stirring, oxygenation and reflux operations are all turned off, and the aforementioned process actions are stopped to ensure that the oxygen-deficient purification module 2 and the oxygen-consuming purification module 3 achieve overall static sedimentation and strong solid-liquid separation of mud and water phase in the second time segment without power interference.

[0072] (7) Skimming operation: The pneumatic booster pump 511 is started and runs for a preset time (e.g., selectable within 0-10 minutes). The upper clear liquid is taken from the oxygen-consuming purification module 3 and water is injected into the skimming inner tank 522. After the water in the skimming inner tank 522 reaches a certain volume, it slowly drops to below the preset adjustable maximum liquid level of the oxygen-consuming tank 31 under water pressure. Then, the skimming valve 526 is opened after a delay to start draining the treated water. Until the fixed part 534 and the limit buckle part 533 abut against each other, the liquid level of the oxygen-consuming tank 31 drops to the preset adjustable minimum liquid level. At this time, the drainage in the third time segment ends.

[0073] (8) Phosphorus removal chemical dosing operation: The dosing component 43 operates, and the chemical solution is added to the dosing tank 41 according to the process requirements for phosphorus removal and flocculation, thereby improving the purification efficiency of pollutants such as chemical phosphorus removal and flocculation. The phosphorus removal chemical dosing operation in the third time segment can start and end synchronously with the skimming operation.

[0074] The rural sewage purification system described in this application eliminates the risk of activated sludge loss and enhances the long-term effectiveness of microbial treatment in the rural sewage purification system.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rural sewage purification system, characterized in that, The rural sewage purification system includes multiple anoxic purification modules, multiple oxygen-consuming purification modules, a circulation lifting component, a skimming component, and a chemical purification module. The multiple anoxic purification modules are connected in series, and the multiple oxygen-consuming purification modules are also connected in series. The anoxic purification module at the end is connected to the oxygen-consuming purification module at the beginning. The chemical purification module is located downstream of the oxygen-consuming purification module. The skimming component transports water from the oxygen-consuming purification module at the end to the chemical purification module. The oxygen-consuming purification module at the end is connected to the anoxic purification module at the beginning through the circulation lifting component. The oxygen-consuming purification module includes an oxygen-consuming tank, a microporous aeration component, and a vortex aeration component. Both the microporous aeration component and the vortex aeration component are connected to an aeration air source and extend to below the liquid surface of the oxygen-consuming tank. The skimming component includes a water intake mechanism and a receiving mechanism. The water intake mechanism can transport water from the oxygen-consuming purification module to the receiving mechanism. The receiving mechanism is connected to the drug purification module. The receiving mechanism includes two float-mounted water-lifting components, a skimming inner tank, a connecting slide bar, and a flexible water outlet component. The two float-mounted water-lifting components are connected to the skimming inner tank via the connecting slide bar. The two float-mounted water-lifting components are symmetrically arranged relative to the skimming inner tank. The flexible water outlet component is connected to the bottom of the skimming inner tank and is equipped with a skimming valve. The water intake mechanism includes a pneumatic booster pump, a booster pipe, and a water injection pipe. One end of the booster pipe is connected to the pneumatic booster pump, and the other end of the booster pipe is connected to the water injection pipe. One end of the water injection pipe can extend below the liquid surface of the oxygen-consuming pool, and the other end of the water injection pipe extends into the skimming inner tank to inject water into the interior of the skimming inner tank.

2. The rural sewage purification system according to claim 1, characterized in that, The anoxic purification module includes an anoxic pool and an anoxic stirring component. One end of the anoxic stirring component is connected to a stirring gas source, and the other end of the anoxic stirring component extends below the liquid surface in the anoxic pool. At least one of the anoxic purification modules contains a carbon source replenishment component to add external carbon source replenishment liquid to the anoxic pool included in the anoxic purification module.

3. The rural sewage purification system according to claim 1, characterized in that, The drug purification module includes a dosing tank, a water purification tank, and a dosing component. The skimming component can transport water from the oxygen-consuming purification module to the dosing tank. The dosing component is located on one side of the dosing tank to add drug solution to the dosing tank. The dosing tank is connected to the water purification tank.

4. The rural sewage purification system according to claim 3, characterized in that, The drug purification module also includes a guiding component and a separation component. Both the separation component and the guiding component are fixed inside the water purification tank. The guiding component is located above the separation component and is connected to the dosing tank. The separation component can separate the sludge to be settled and the water that has passed through the separation component in opposite directions.

5. The rural sewage purification system according to claim 3, characterized in that, The rural sewage purification system also includes a sludge storage module and a sludge discharge component. The sludge storage module is connected to the circulation lifting component, and the bottom of the water purification tank is connected to the sludge storage module through the sludge discharge component.

6. The rural sewage purification system according to claim 2, characterized in that, The rural sewage purification system also includes an inlet module, which includes an inlet pool and a flow guiding component. The inlet pool is connected to the sewage source, and the flow guiding component is installed inside the inlet pool. The flow guiding component can transport the water in the inlet pool to the anoxic purification module.

7. The rural sewage purification system according to claim 6, characterized in that, The water inlet module also includes a water inlet stirring component, one end of which is connected to the stirring air source, and the other end of which extends below the liquid surface of the water inlet pool.

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