Switchable scale rural sewage integrated treatment equipment and treatment method

Abstract

The application discloses a switchable-scale rural sewage integrated treatment device and a treatment method, and belongs to the technical field of sewage treatment, and comprises a filler device arranged in an aerobic tank and capable of automatically adjusting the working area size of biological elastic filler according to the water level; the filler device is provided with a floater, the floater floats on the water surface of the aerobic tank and rises and falls along with the water level of the aerobic tank; a hook is connected to one end of the floater, biological elastic filler is fixed on the hook, and the biological elastic filler is arranged along the length direction of the hook; and a steel rope is fixed at both ends on the inner wall of the aerobic tank, and the rope body part of the steel rope is connected to the bottom end of the hook. The switchable-scale rural sewage integrated treatment device can effectively reduce the energy consumption of sewage treatment by more than 30% and reduce the operation cost of the device.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, specifically, it relates to an integrated rural wastewater treatment equipment and method with switchable scale. Background Technology

[0002] Continuously improving the rural living environment, refining the technical support for rural domestic sewage treatment, and strengthening the scientific and technological support for rural domestic sewage treatment have become important tasks in the current rural domestic sewage treatment efforts.

[0003] Rural decentralized domestic sewage can be treated using natural purification technologies and integrated treatment technologies. Natural purification technologies, such as constructed wetland sewage treatment, wastewater land treatment, and stabilization pond treatment, utilize the self-purification function of plants and microorganisms in natural water bodies or soil to absorb and degrade pollutants. However, they have drawbacks such as being limited by environmental conditions and having unstable effluent quality. Integrated treatment technology refers to the optimized design and combination of various functional modules of traditional sewage treatment processes, reducing process complexity and meeting the requirements of different scales, costs, and influent water quality. Its advantages include convenient transportation, simple on-site installation, and smaller footprint. Integrated sewage treatment technology is currently a hot research topic in rural domestic sewage treatment technology.

[0004] Currently, due to my country's unique population and geographical structure and culture, the rural areas have a relatively small resident population for most of the year, resulting in relatively low wastewater production. However, during holidays, the rural population experiences significant growth, leading to a corresponding increase in wastewater production. This results in fluctuations in the quality and quantity of rural wastewater. Current integrated rural wastewater treatment equipment and related technologies often experience off-season water volumes far below design capacity, while the aeration equipment and pumps within these systems continue to operate at their designed capacity, leading to unnecessary energy consumption and increased operating costs, which is inconsistent with the current trend of carbon sequestration. The cost of rural wastewater treatment remains a major obstacle to the progress of rural wastewater management; it is not uncommon for village collectives to be forced to shut down wastewater treatment equipment due to unpaid electricity and chemical costs.

[0005] Chinese invention patent publication number CN112079530A disclosed on December 15, 2020, an integrated sewage treatment system, including an anaerobic tank, an MBBR tank, a sludge tank, a disinfection tank, and an equipment room. The anaerobic tank, MBBR tank, sludge tank, disinfection tank, and equipment room are all covered with heating wires and insulation boards. A first agitator is installed in the anaerobic tank, which is filled with a first MBBR packing material. The anaerobic tank is connected to an inlet pipe and to the MBBR tank via a pipe. The MBBR tank is filled with a second MBBR packing material. An aeration device is installed at the bottom of the MBBR tank. A second agitator and a return water pump are installed in the MBBR tank. The return water pump is connected to the sludge tank via a pipe. The sludge tank is connected to the disinfection tank via an overflow pipe. A cyclone fan is installed in the equipment room, and the aeration device is connected to the cyclone fan. An effluent pump is installed in the disinfection tank, and the effluent pump is connected to an effluent pipe.

[0006] The aforementioned invention patents have the drawback of being unable to adapt to fluctuations in rural sewage volume, requiring integrated sewage treatment equipment to be designed with the maximum water volume as the operating capacity, resulting in high energy consumption and persistently high equipment operating costs. Summary of the Invention

[0007] 1. The problem to be solved

[0008] To address the technical problems of existing integrated sewage treatment equipment being unable to adapt to fluctuations in rural sewage production and high sewage treatment costs, this invention provides a switchable-scale integrated rural sewage treatment equipment and method that can automatically switch treatment modes based on sewage flow to solve the aforementioned technical problems.

[0009] 2. Technical Solution

[0010] To solve the above problems, the present invention adopts the following technical solution:

[0011] A modular integrated rural wastewater treatment system, comprising an anaerobic tank, an anoxic tank, an aerobic tank, and a sedimentation tank.

[0012] In the modular integrated rural wastewater treatment equipment, the aerobic tank is equipped with a packing device that automatically adjusts the size of the working area of ​​the biological elastic packing material as the water level rises and falls. This packing device has…

[0013] A floater that floats on the surface of the aerobic pool and rises and falls with the water level.

[0014] A hook, one end of which is connected to the floater, and the bio-elastic packing material is fixed thereon, the bio-elastic packing material extending along the length of the hook;

[0015] A steel rope, with both ends fixed to the inner wall of the aerobic tank, and its rope body connected to the bottom end of the hook.

[0016] The floating device floats on the water surface, its height adjusting with the rise in water level to ensure that the biological packing material connected to it remains below the liquid surface. When the floating device is at its highest water level, it straightens the hooks, maximizing the length of the biological resilient packing material on each hook and thus maximizing its working area to meet wastewater treatment needs at the highest water level. As the water level in the aerobic tank decreases, the floating device lowers accordingly, and the biological resilient packing material at the bottom of the hooks adaptively folds and stacks on the steel cable. Therefore, the entire bioresilient packing material on the hooks can be divided into a folding area and a working area. The folding area results in minimal material loss, effectively saving materials. The working area involves the bioresilient packing material for wastewater treatment. Thus, as the water level rises or falls, the floating device adaptively adjusts the size of the working area of ​​the biological resilient packing material on the hooks, meeting wastewater treatment requirements while maximizing material savings and reducing costs.

[0017] Furthermore, in the modular integrated rural wastewater treatment equipment, the floating device consists of several hollow tubes connected to form a planar floating body. This floating body floats on the surface of the aerobic tank, with several hooks suspended below it. The use of hollow tubes in the floating device prevents pollutants from accumulating, allowing for prolonged use without frequent cleaning.

[0018] Furthermore, in the rural sewage integrated treatment equipment with switchable scale, several aeration valves are provided below the packing device. The aeration valves generate bubbles that supply oxygen to the microorganisms on the biological elastic packing.

[0019] Furthermore, in the rural sewage integrated treatment equipment with switchable scale, the aerobic tank is equipped with a third and a fourth water inlet at different heights. The third water inlet is connected to the first connecting pipe, and the fourth water inlet is connected to the second connecting pipe.

[0020] A first electric butterfly valve is installed on the first connecting pipe, and the first electric butterfly valve controls the opening and closing of the first connecting pipe;

[0021] A second electric butterfly valve is installed on the second connecting pipe, and the second electric butterfly valve controls the opening and closing of the second connecting pipe; the sewage treatment scale of the aerobic tank is switched by controlling the opening and closing of the first electric butterfly valve and the second electric butterfly valve.

[0022] The aerobic tank has a third and a fourth inlet at different heights, with the fourth inlet located directly below the third inlet. A first connecting pipe is sealed to the outer end of the fourth inlet, one end of which leads to the sedimentation tank. A second connecting pipe is connected to the outer end of the fourth inlet, the other end of which connects to the first connecting pipe. Electric butterfly valves are installed on both the first and second connecting pipes to control their opening and closing. The water level in the aerobic tank can be controlled by operating these valves. During peak sewage discharge periods, closing the second electric butterfly valve on the second connecting pipe and opening the first electric butterfly valve on the first connecting pipe maintains a high water level in the aerobic tank. During periods of low sewage discharge, closing the first electric butterfly valve on the first connecting pipe and opening the second electric butterfly valve on the second connecting pipe maintains a lower water level in the aerobic tank. This addresses the problem of existing integrated sewage treatment equipment being unable to adapt to fluctuations in rural sewage production.

[0023] Furthermore, in the modular integrated rural wastewater treatment equipment, the third and fourth inlets are each equipped with an outlet channel. The outlet channel has a weir plate, with both ends sealed to the inner wall of the aerobic tank to separate the inlet of the first or second connecting pipe from the water in the aerobic tank. The top of the weir plate is serrated. The outlet channel raises the water level, thereby increasing the effective volume of the effluent from the aerobic tank. In addition, the serrated top of the weir plate effectively regulates the water flow, controls the water level in the tank, ensures uniform effluent distribution, and prevents flow deviation or short-circuiting. Simultaneously, the serrated shape of the outlet channel separates clean water from larger solid pollutants; larger solid pollutants cannot pass through the weir plate, allowing only clean water to flow into the outlet channel, thus preventing blockage of the inlets in the aerobic tank.

[0024] Furthermore, in the modular integrated rural wastewater treatment equipment, the aerobic tank is equipped with a mixed liquor return pipe. One end of the pipe is located at the bottom of the aerobic tank, and the other end connects to the anoxic tank, allowing the mixed liquor from the bottom of the aerobic tank to be returned to the anoxic tank. The mixed liquor contains nitrified liquid, which, after returning to the anoxic tank, flows downwards and passes through the anoxic tank again for purification.

[0025] Furthermore, in the rural sewage integrated treatment equipment with switchable scale, a fifth connecting pipe is installed on the aerobic tank, which connects to the sedimentation tank. The inlet of the fifth connecting pipe is connected to a liquid level adaptive adjustment device. The liquid level adaptive adjustment device has a water adjustment tank and a float. The water adjustment tank includes a main water tank and a secondary water tank. The main water tank has several water inlets along its circumference in the height direction, and the secondary water tank has an outlet that connects to the main water tank. The float is connected and located inside the main water tank, and its outer circumference is fitted against the inner wall of the main water tank to block the water inlets on the main water tank, thereby limiting the number of water inlets that can be opened or closed. The main water tank has a slot, and one end of a fixed arm is connected to the float, while the other end passes through the slot and is fixed to the floater. The floater moves up and down inside the main water tank as the water level rises and falls.

[0026] Furthermore, in the rural sewage integrated treatment equipment with switchable scale, the main water tank is provided with a limiting hole along its height direction, and a limiting pin is connected in the limiting hole.

[0027] During operation, the float rises with the water level in the aerobic tank, which in turn moves the float block in the main tank upwards via the fixed arm. As the float block rises, it releases more inlet and outlet holes (ensuring they are connected), increasing the flow rate of the adaptive level control device. Conversely, if the water level drops, the float block lowers, blocking more inlet and outlet holes, reducing the flow rate of the adaptive level control device. This continues until the inflow and outflow rates reach equilibrium. The adaptive level control device can adjust the outflow rate of the aerobic tank based on changes in water level, ensuring that the inflow and outflow rates remain consistent. The entire integrated rural wastewater treatment system is adaptively adjustable in terms of treatment capacity, not limited to high or low treatment levels, greatly improving its adaptability.

[0028] A method for integrated rural sewage treatment with switchable scale.

[0029] S1: Monitor sewage flow, collect sewage flow per unit time, compare the collected sewage flow with preset values, define sewage flow exceeding preset values ​​as peak sewage treatment period, and define sewage flow not exceeding preset values ​​as low sewage treatment period.

[0030] S2: Phosphorus release and denitrification treatments are carried out in the anaerobic and anoxic tanks to degrade and reduce the nitrogen content in the wastewater;

[0031] S3: The wastewater is treated to remove organic matter in the aerobic tank; and a third and a fourth water inlet at different heights are set in the aerobic tank, and the wastewater treatment volume in the aerobic tank is controlled by controlling the opening and closing of the third and fourth water inlets;

[0032] S4: Sludge-water separation is carried out in the sedimentation tank, and a fifth and a sixth water outlet at different heights are set in the sedimentation tank. The sewage treatment volume in the sedimentation tank is controlled by controlling the opening and closing of the sixth water outlet. The supernatant separated in the sedimentation tank flows into the clear water tank for storage.

[0033] Furthermore, in integrated rural wastewater treatment methods with switchable scales,

[0034] In step S3, during the low-water-treatment period, the second electric butterfly valve on the second connecting pipe is opened to keep the aerobic tank at a low water level; during the high-water-treatment period, the electric butterfly valve on the second connecting pipe is closed and the first electric butterfly valve on the first connecting pipe is opened to keep the aerobic tank at a high water level.

[0035] In step S4, during the low-water-treatment period, the third electric butterfly valve on the fourth connecting pipe is opened to maintain the aerobic tank at a lower water level; during the high-water-treatment period, the third electric butterfly valve on the fourth connecting pipe is closed to maintain the aerobic tank at a higher water level.

[0036] A packing device is installed in the aerobic tank. The packing device adaptively adjusts the size of its biological elastic packing working area according to the water level to meet the treatment needs of wastewater at different water levels.

[0037] 3. Beneficial effects

[0038] (1) This invention provides a third and fourth inlet at different heights in the aerobic tank, with the fourth inlet located directly below the third inlet. The water level in the aerobic tank can be controlled by operating the first and second electric butterfly valves. During peak sewage discharge periods, closing the second electric butterfly valve on the second connecting pipe and opening the first electric butterfly valve on the first connecting pipe maintains a high water level in the aerobic tank. During off-peak sewage discharge periods, closing the first electric butterfly valve on the first connecting pipe and opening the second electric butterfly valve on the second connecting pipe maintains a lower water level in the aerobic tank. This solves the problem that integrated sewage treatment equipment in existing technologies cannot adapt to fluctuations in rural sewage production. Furthermore, the power of the air pumps and blowers used during off-peak sewage treatment periods is reduced, decreasing energy consumption and saving costs. Compared to existing technologies, the technical solution provided in this application reduces energy consumption by more than 30% for every 150 tons of sewage treated.

[0039] (2) This invention utilizes a packing device installed in an aerobic tank that automatically adjusts the size of the working area of ​​the bioelastic packing material as the water level rises and falls. The packing device includes a floater, hooks, and a steel cable. The floater floats on the water surface, its height adjusting with the water level, ensuring that the bioelastic packing material connected below the floater remains below the liquid surface. When the floater is at its highest water level, it straightens the hooks, maximizing the length of the bioelastic packing material on each hook to meet the wastewater treatment requirements at the highest water level. As the water level in the aerobic tank decreases, the floater height decreases accordingly, and the bioelastic packing material at the bottom of the hooks adaptively folds and stacks on the steel cable (the folded portion of the bioelastic packing material does not participate in wastewater treatment). Therefore, the bioelastic packing material on the hooks can be divided into a folding area and a working area. The folded portion of the bioelastic packing material experiences less wear and tear, saving material, while the working portion participates in wastewater treatment. Thus, as the water level rises or falls, the floater adaptively adjusts the size of the working area of ​​the bioelastic packing material on the hooks, meeting wastewater treatment requirements while maximizing material savings and thus reducing costs.

[0040] (3) This invention, by setting up a liquid level adaptive adjustment device at the outlet of the aerobic tank, ensures that the effluent and influent flow rates of the aerobic tank remain consistent. The entire integrated rural sewage treatment equipment has an adaptively adjustable treatment capacity, not limited to two treatment levels (high and low), greatly improving the adaptability of the entire integrated rural sewage treatment equipment. Attached Figure Description

[0041] Figure 1 A schematic diagram of the internal structure of an integrated rural sewage treatment equipment with switchable scale.

[0042] Figure 2 This is a schematic diagram of the outer casing structure;

[0043] Figure 3 This is a schematic diagram of the packing device structure;

[0044] Figure 4 This is a schematic diagram of the working area and folding area of ​​the bio-elastic packing in the packing device;

[0045] Figure 5 A schematic diagram of a rural wastewater integrated treatment method with switchable scale;

[0046] Figure 6 A schematic diagram showing the installation location of the adaptive level adjustment device for a rural integrated sewage treatment equipment with switchable scale.

[0047] Figure 7 A schematic diagram of the liquid level adaptive adjustment device for a rural integrated sewage treatment equipment with switchable scale.

[0048] Figure 8 This is a cross-sectional schematic diagram of an integrated rural sewage treatment equipment with switchable scale.

[0049] In the picture:

[0050] 100. Anaerobic tank; 101. Inlet; 102. First outlet;

[0051] 200. Anoxic tank; 201. Second inlet;

[0052] 300. Aerobic tank; 310. Packing device; 311. Floating device; 3111. Hollow hose; 312. Hook; 313. Biological elastic packing; 320. Aeration device; 321. Aeration module; 322. Air pipe; 330. Steel rope; 340. Third water outlet; 341. First connecting pipe; 342. First electric butterfly valve; 350. Fourth water outlet; 351. Second connecting pipe; 352. Second electric butterfly valve; 360. Outlet channel; 361. Weir plate; 362. Bottom plate; 370. Mixed liquor return pipe;

[0053] 400. Sedimentation tank; 410. Sludge return pipe; 420. Fifth inlet; 421. Third connecting pipe; 430. Sixth inlet; 431. Fourth connecting pipe; 432. Third electric butterfly valve;

[0054] 500. Clear water pool; 510. Seventh water outlet;

[0055] 600. Partition;

[0056] 700, Valve Room;

[0057] 800. Liquid level adaptive adjustment device; 810. Fifth connecting pipe; 820. Water adjustment tank; 830. Float; 821. Main water tank; 822. Auxiliary water tank; 823. Water inlet; 824. Water outlet; 825. Slot; 830. Float; 840. Fixed arm; 850. Limit pin; 860. Limit hole. Detailed Implementation

[0058] The following detailed description of exemplary embodiments of the invention is taken with reference to the accompanying drawings, which form part of the description and illustrate exemplary embodiments in which the invention may be practiced. While these exemplary embodiments have been described in sufficient detail to enable those skilled in the art to practice the invention, it should be understood that other embodiments may be implemented and various changes may be made to the invention without departing from the spirit and scope thereof. The more detailed description of embodiments of the invention below is not intended to limit the scope of the claimed invention, but is merely illustrative and not restrictive of the description of the features and characteristics of the invention, to suggest the best mode for carrying out the invention, and is sufficient to enable those skilled in the art to practice the invention. Therefore, the scope of the invention is defined only by the appended claims.

[0059] Example 1

[0060] like Figure 1 As shown, this application provides an integrated rural sewage treatment equipment with switchable scale, including an anaerobic tank 100, an anoxic tank 200, an aerobic tank 300, a sedimentation tank 400, and a clear water tank 500. The anaerobic tank 100, anoxic tank 200, aerobic tank 300, sedimentation tank 400, and clear water tank 500 are housed in a rectangular box, and adjacent tanks are separated by partition plates 600.

[0061] like Figure 1-2 As shown, an inlet 101 is located at the upper corner of the left side of the anaerobic tank 100, through which wastewater flows into the anaerobic tank 100. The anaerobic tank 100 contains facultative anaerobic bacteria. During the residence period of the wastewater in the anaerobic tank 100, the microbial community (mainly facultative anaerobic bacteria and polyphosphate-accumulating bacteria) within the anaerobic tank 100 decomposes the organic matter in the pollutants through biological reactions. The primary purpose of wastewater treatment in the anaerobic tank 100 is phosphorus release (releasing phosphorus from the wastewater). The facultative anaerobic bacteria in the anaerobic tank 100 can convert some easily biodegradable large-molecule organic matter in the wastewater into small-molecule volatile fatty acids. Then, polyphosphate-accumulating bacteria absorb the volatile fatty acids, storing them in the form of poly-β-hydroxybutyrate (PHB), and hydrolyze the accumulated phosphorus within their cells into orthophosphate, releasing it into the water. Dissolved organic matter is absorbed by microbial cells, which reduces the concentration of five-day biochemical oxygen demand in wastewater. Nitrogen content is partially removed due to cell synthesis, which reduces the concentration of nitrogen in wastewater, but the nitrogen nitrate content remains unchanged.

[0062] like Figure 2As shown, a first inlet 102 is provided on the partition 600 between the anaerobic tank 100 and the anoxic tank 200. Wastewater from the anaerobic tank 100 is introduced into the anoxic tank 200 through the first inlet 102. Denitrifying bacteria are introduced into the anoxic tank 200, and the wastewater undergoes denitrification treatment within the anoxic tank 200. The denitrification treatment involves the denitrifying bacteria using organic matter in the wastewater as a carbon source to reduce the large amount of nitrogenous nitrates brought in from the return mixed liquor from the aerobic tank 300 into nitrogen gas, which is then released into the air. Therefore, the five-day biochemical oxygen demand (BOD) concentration decreases. The nitrogenous nitrate concentration in the anoxic tank 200 decreases significantly, while the phosphorus content changes very little. A second inlet 201 is provided on the partition 600 between the anoxic tank 200 and the aerobic tank 300, and wastewater from the anoxic tank 200 is introduced into the aerobic tank 300 through the second inlet 201. The inlet 101, the first outlet 102, and the second outlet 201 are respectively positioned opposite each other on the inner walls of the anaerobic tank 100 and the anoxic tank 200, so that the sewage can pass through the anaerobic tank 100 and the anoxic tank 200 with the maximum path, thereby maximizing the treatment of the sewage.

[0063] like Figure 1-4As shown, after treatment in the anoxic tank 200, wastewater flows into the aerobic tank 300 through the second inlet 201. The aerobic tank 300 is the largest area in the entire integrated wastewater treatment equipment. From top to bottom, the aerobic tank 300 includes a packing device 310 and an aeration device 320. The aeration device 320 is located directly below the packing device 310, and the bubbles generated by the aeration device 320 supply oxygen to the packing device 310. The packing device 310 has a floater 311, hooks 312, and bioelastic packing material 313. The middle part of the floater 311 consists of several parallel hollow hoses 3111, and the two sides are sealed together by the hollow hoses 3111. The hooks 312 are sequentially attached to the hollow hoses 3111 of the floater 311. The bioelastic packing material 313 is fixedly connected below the hooks 312 for microbial reproduction. Below the hook 312 are several parallel packing steel cables 330. The position and number of the steel cables 330 correspond one-to-one with the hollow hoses 3111 in the middle of the floater 311, so that the bottom of the hook 312 on each hollow hose 3111 can be connected to the steel cable 330. The floater 311 floats on the water surface, and its height adjusts with the water level, thus ensuring that the biological packing material connected below the floater 311 is always below the liquid surface. In addition, when the floater 311 is at the highest water level, the floater 311 can cause the hooks 312 to straighten, so that the biological elastic packing material 313 on each hook 312 is at its maximum length to meet the sewage treatment requirements at the highest water level. When the water level in the aerobic tank 300 drops, the height of the floater 311 decreases accordingly, and the biological elastic packing material 313 at the bottom of the hook 312 will adaptively fold partially and stack on the steel cables 330. Therefore, the biological elastic packing material 313 on the entire hook 312 can be divided into a folding area and a working area. The bio-elastic packing material 313 in the working area participates in the sewage treatment process. Therefore, as the water level rises or falls, the float 311 can adaptively adjust the length of the bio-elastic packing material 313 on the hook 312, so as to meet the sewage treatment requirements while saving the material of the bio-elastic packing material 313 to the greatest extent and thus saving costs.

[0064] like Figure 1 As shown, the aeration device 320 consists of several aeration modules 321 laid flat at the bottom of the aerobic tank 300. Each aeration module 321 has several parallel air vents 322, and each air vent 322 is connected to several aeration valves. Each aeration module 321 is connected to an air supply pipe 322, one end of which is connected to an air supply pump, and the other end is connected to the air vents 322 of the aeration module 321. The air supply pump introduces air into the aeration module 321 through the air supply pipes 322, and then generates bubbles through each aeration valve. As the bubbles move upwards, they pass through the bioelastic packing material 313, supplying oxygen to the microorganisms on the bioelastic packing material 313.

[0065] like Figure 2As shown, the aerobic tank 300 is equipped with a third inlet 340 and a fourth inlet 350 at different heights, with the fourth inlet 350 located directly below the third inlet 340. A first connecting pipe 341 is sealed to the outer end of the fourth inlet 350, with one end of the first connecting pipe 341 leading to the sedimentation tank 400. A second connecting pipe 351 is connected to the outer end of the fourth inlet 350, with the other end of the second connecting pipe 351 connecting to the first connecting pipe 341. Electric butterfly valves are respectively installed on the first connecting pipe 341 and the second connecting pipe 351 to control the opening and closing of the two pipes. The water level in the aerobic tank 300 can be controlled by controlling the electric butterfly valves. During peak sewage discharge periods, closing the second electric butterfly valve 352 on the second connecting pipe 351 and opening the first electric butterfly valve 342 on the first connecting pipe 341 maintains a high water level in the aerobic tank 300. During periods of low sewage discharge, closing the first electric butterfly valve 342 on the first connecting pipe 341 and opening the second electric butterfly valve 352 on the second connecting pipe 351 will allow the aerobic tank 300 to maintain a lower water level.

[0066] like Figure 2 As shown, a discharge channel 360 is connected below the third outlet 340 and the fourth outlet 350. The discharge channel 360 includes a weir plate 361 and a bottom plate 362, which are combined to form an L-shaped plate. The weir plate 361 and the bottom plate 362, together with the wall of the aerobic tank 300, form a U-shaped discharge channel 360. The third outlet 340 and the fourth outlet 350 are located within their respective discharge channels 360. The function of the discharge channel 360 is to raise the water level, thereby increasing the effective volume of the water discharged from the aerobic tank 300. In addition, the top of the weir plate 361 is serrated, which can effectively regulate the water flow, control the water level in the tank, ensure uniform distribution of the discharged water flow, and avoid the phenomenon of deviated flow or short flow at the discharge point. Meanwhile, the serrated outlet channel 360 can separate clean water from larger solid pollutants. Larger solid pollutants cannot pass through the weir plate 361, and only clean water flows into the outlet channel 360, thus avoiding blockage of the inlet in the aerobic pool 300.

[0067] Wastewater flows into aerobic tank 300, where aerobic microorganisms utilize dissolved oxygen in the water for aerobic respiration, decomposing organic matter into carbon dioxide and water. Organic nitrogen is ammonified and then nitrified, significantly reducing ammonia nitrogen concentration. Poly-β-hydroxybutyric acid (PHB) within polyphosphate-accumulating bacteria undergoes oxidative decomposition for its own growth and reproduction, while simultaneously absorbing excess orthophosphate from the wastewater and storing it intracellularly as polyphosphate. Adding bioelastic packing material 313 to aerobic tank 300 allows bacteria to attach to the packing material, increasing sludge age and improving nitrification efficiency; it also shortens the residence time in the aerobic stage, allowing more time for phosphorus release and uptake in the anaerobic and anoxic stages, thus improving phosphorus removal efficiency. Simultaneously, the absorption of dissolved organic matter by microbial cells reduces the five-day biochemical oxygen demand (BOD5) concentration in the wastewater.

[0068] like Figure 1 As shown, the aerobic tank 300 is equipped with a mixed liquor return pipe 370, which is used to transport the mixed liquor (specifically, the nitrified liquor in the mixed liquor) in the aerobic tank 300 to the anoxic tank 200. The return of the mixed liquor in the mixed liquor return pipe is powered by an air lift device or a water pump. The inlet of the mixed liquor return pipe 370 is located at one end of the fourth outlet 350 of the aerobic tank 300. The inlet of the mixed liquor return pipe 370 is located directly below the fourth outlet 350. The outlet of the mixed liquor return pipe 370 is located in the anoxic tank 200, specifically near the partition plate 600 of the anoxic tank 200. The nitrified liquor contained in the mixed liquor, after returning to the anoxic tank 200, can fall downwards and pass through the anoxic tank 200 again for purification treatment.

[0069] like Figure 2 As shown, the adjacent side of the aerobic tank 300 is a valve compartment 700. The first connecting pipe 341 and the second connecting pipe 351 pass through the valve compartment 700 and enter the sedimentation tank 400. The first electric butterfly valve 342 and the second electric butterfly valve 352 are installed in the valve compartment 700. The valve compartment 700 isolates sewage and prevents the electric butterfly valves from coming into contact with water.

[0070] like Figure 2 As shown, the sedimentation tank 400 is located on the adjacent side of the valve room 700, and the outlet of the second connecting pipe 351 is located inside the sedimentation tank 400 guide tube directly above the sedimentation tank 400. The outlet of the second connecting pipe 351 faces upwards, and the water jets upwards before falling into the sedimentation tank 400 through the sedimentation tank 400 guide tube. Two inclined plates are provided at the bottom of the sedimentation tank 400, positioned opposite each other to create a funnel shape at the bottom. This funnel shape helps to collect sludge. A sludge return pipe 410 is located at the bottom of the sedimentation tank 400 to extract the collected sludge settled below the sedimentation tank 400. The sludge outlet of the sludge return pipe 410 leads to the anaerobic tank 100. The sludge return within the sludge return pipe is powered by an air-lift device or a water pump.

[0071] like Figure 2As shown, the sedimentation tank 400 has a fifth inlet 420 and a sixth inlet 430 on its side, with the fifth inlet 420 located directly above the sixth inlet 430. The outer end of the fifth inlet 420 is connected to a third connecting pipe 421. The outer end of the sixth inlet 430 is connected to a fourth connecting pipe 431, which is equipped with a third electric butterfly valve 432. The third electric butterfly valve 432 controls the opening and closing of the fourth connecting pipe 431. When the sewage discharge is at a low level, only the third electric butterfly valve 432 on the fourth connecting pipe 431 is opened, and sewage flows out through the fourth connecting pipe 431. When the sewage discharge is at a high level, the third electric butterfly valve 432 on the fourth connecting pipe 431 is closed, and sewage flows out through the third connecting pipe 421. Both the fifth inlet 420 and the sixth inlet 430 are connected to an outlet channel 360 at their inner ends.

[0072] The clear water tank 500 is located on the side of the sedimentation tank 400. The water flowing through the third connecting pipe 421 and the fourth connecting pipe 431 falls into the clear water tank 500 for later use. A seventh water outlet 510 is provided on the inner wall of one side of the clear water tank 500. The water in the clear water tank 500 flows out of the integrated sewage treatment equipment through the seventh water outlet 510.

[0073] like Figure 5 As shown, this application provides a method for integrated rural sewage treatment with switchable scale, including...

[0074] A method for integrated rural sewage treatment with switchable scale.

[0075] S1: Monitor sewage flow rate; In the rural sewage integrated treatment method with switchable scale, in step S1, the sewage flow rate per unit time is collected and compared with the preset value. The sewage flow rate exceeding the preset value is defined as the sewage treatment peak period, and the sewage flow rate not exceeding the preset value is defined as the sewage treatment trough period.

[0076] S2: Phosphorus release and denitrification treatments are carried out in anaerobic tank 100 and anoxic tank 200 to degrade and reduce the nitrogen content in wastewater;

[0077] S3: The wastewater is treated to remove organic matter in the aerobic tank 300; and a third inlet 340 and a fourth inlet 350 at different heights are set in the aerobic tank 300. The wastewater treatment volume in the aerobic tank 300 is controlled by controlling the opening and closing of the third inlet 340 and the fourth inlet 350; during the low wastewater treatment period, the second electric butterfly valve 352 on the second connecting pipe 351 is opened to keep the aerobic tank 300 at a lower water level; during the peak wastewater treatment period, the electric butterfly valve on the second connecting pipe 351 is closed and the first electric butterfly valve 342 on the first connecting pipe 341 is opened to keep the aerobic tank 300 at a high water level; in the rural wastewater integrated treatment method with switchable scale, a packing device 310 is set in the aerobic tank 300. The packing device 310 adaptively adjusts the size of its biological elastic packing 313 working area according to the water level to meet the treatment needs of wastewater at different water levels.

[0078] S4: Sludge-water separation is performed in sedimentation tank 400. A fifth inlet 420 and a sixth inlet 430 at different heights are installed in sedimentation tank 400. The wastewater treatment volume in sedimentation tank 400 is controlled by controlling the opening and closing of the sixth inlet 430. During periods of low wastewater treatment, the third electric butterfly valve 432 on the fourth connecting pipe 431 is opened to maintain a lower water level in aerobic tank 300. During periods of high wastewater treatment, the third electric butterfly valve 432 on the fourth connecting pipe 431 is closed to maintain a higher water level in aerobic tank 300. The supernatant separated in sedimentation tank 400 flows into clear water tank 500 for storage.

[0079] The first electric butterfly valve 342, the second electric butterfly valve 352, and the third electric butterfly valve 432 are connected to the controller. The controller receives the monitored sewage flow signal, processes it, and controls the opening and closing of the first electric butterfly valve 342, the second electric butterfly valve 352, and the third electric butterfly valve 432.

[0080] Energy consumption analysis:

[0081] During peak water consumption periods around the Spring Festival (influent flow rate 200 m³ / d), wastewater generation is also high, reaching the equipment's maximum design capacity. The integrated equipment's influent pump reaches its rated design power. Wastewater sequentially passes through the anaerobic and anoxic zones before entering the aerobic zone. At this point, the aerobic tank's liquid level reaches its maximum design point, the floating supports rise accordingly, and the biological elastic packing material fully expands, allowing for thorough contact and reaction with the wastewater. The aerobic tank's retention time is 12 hours. Wastewater then enters the sedimentation tank through the effluent outlet. After sludge-water separation, the supernatant flows through the effluent weir into the clear water tank for disinfection before being discharged in compliance with standards.

[0082] Table 1: Peak hours (200m) 3 / d) Integrated equipment power consumption meter

[0083]

[0084] During certain regular periods, when there are fewer local residents remaining on-site and water consumption is at its lowest, the integrated equipment's inlet flow rate is 150m³ / h. 3 At approximately 12 hours, the aerobic tank liquid level reaches the designed minimum level. The floating support and the effluent device connected to it will also be at the same height as the liquid level. The effluent level in the aerobic tank drops to the minimum designed effluent level, and the elastic packing material in the folding zone will fold up completely and not participate in the reaction, effectively extending the packing material's lifespan. Simultaneously, the retention time in the aerobic tank remains at 12 hours, ensuring the effectiveness of the biological reaction. Through interlocking with the influent pump, the nitrification liquid return device in the aerobic tank, the aeration device, and the sludge return device in the sedimentation tank will also reduce their frequency, achieving energy savings.

[0085] Table 2: Lowest point (150m) 3 / d) Integrated equipment power consumption meter

[0086]

[0087] However, the peak operating period for the equipment is only about 3 to 5 months per year, while the off-peak operating period can be as long as 7 to 9 months. By adopting off-peak operation mode during off-peak periods and peak operation mode during peak periods, energy consumption can be reduced by approximately 30% annually.

[0088] Example 2

[0089] like Figure 6-8As shown, to enable the outflow from the aerobic tank 300 to adaptively adjust according to the water level, a fifth connecting pipe 810 is installed on the aerobic tank 300, connecting to the sedimentation tank 400. The inlet of the fifth connecting pipe 810 is connected to a water level adaptive regulating device 800. Water in the aerobic tank 300 flows into the fifth connecting pipe 810 after passing through the water level adaptive regulating device 800. The water level adaptive regulating device 800 can adaptively adjust the flow rate of water entering the fifth connecting pipe 810 according to the water level in the aerobic tank 300, ultimately balancing the inflow and outflow of the aerobic tank 300. The water level adaptive regulating device 800 has a water regulating tank 820 and a float 830. The water regulating tank 820 includes a main water tank 821 and a secondary water tank 822. The main water tank 821 has several water inlets 823 along its circumference in the height direction. Water in the aerobic tank 300 flows into the main water tank 821 through the inlet hole 823. The auxiliary water tank 822 has an outlet hole 824 connecting to the main water tank 821. The position of the outlet hole 824 corresponds to the number and position of the inlet holes 823 on the main water tank 821, ensuring that water flowing into the main water tank 821 can flow into the auxiliary water tank 822 in a timely manner. Water in the auxiliary water tank 822 flows into the sedimentation tank 400 through the fifth connecting pipe 810. The cross-sectional area of ​​the fifth connecting pipe 810 is designed to be larger than the sum of the cross-sectional areas of all the inlets on the main water tank 821, so that the fifth connecting pipe 810 will not limit the outflow. A float 830 is connected and located inside the main water tank 821. The outer periphery of the float 830 is in contact with the inner wall of the main water tank 821, but it can slide along the height direction of the main water tank 821. The float 830 can limit the number of times the inlet hole 823 of the main water tank 821 can be opened or closed by blocking the outer periphery of the float 830. The main water tank 821 is provided with a slot 825. One end of the fixed arm 840 is connected to the float 830, and the other end passes through the slot 825 and is fixed to the float device 311311. The float device 311 drives the float 830 to rise and fall within the main water tank 821 as the water level rises and falls. The main water tank 821 is provided with a limiting hole 860 along its height direction. A limiting pin 850 is connected to the limiting hole 860. The limiting pin 850 controls the maximum rising height of the float 830, thereby controlling the maximum water flow of the liquid level adaptive regulating device 800.

[0090] During operation, the float 311 rises as the water level in the aerobic tank 300 rises, which in turn drives the float 830 in the main tank 821 to move upwards via the fixed arm 840. As the float 830 moves upwards, it releases more inlet holes 823 and outlet holes 824 (the inlet holes 823 and outlet holes 824 are interconnected), increasing the flow rate of the adaptive level control device 800. Conversely, if the water level drops, the float 830 lowers, blocking more inlet holes 823 and outlet holes 824, reducing the flow rate of the adaptive level control device 800. This continues until the inflow and outflow rates reach equilibrium. The adaptive level control device 800 can adaptively adjust the outflow rate of the aerobic tank 300 based on changes in water level, ensuring that the outflow and inflow rates of the aerobic tank 300 remain consistent. The entire integrated rural wastewater treatment equipment has an adaptively adjustable treatment capacity, not limited to the high and low treatment levels in Example 1, greatly improving the adaptability of the entire integrated rural wastewater treatment equipment. Furthermore, the main water tank 821 is provided with a limiting hole 860 and a limiting pin 850 along its height direction. By inserting the limiting pin 850 into different limiting holes 860, the maximum floating height of the float 830 is limited, thereby adjusting the maximum treatment water level of the entire aerobic tank 300 and increasing the upper limit of sewage treatment of the entire rural integrated sewage treatment equipment.

[0091] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A rural wastewater integrated treatment equipment with switchable scale, comprising an anaerobic tank (100), an anoxic tank (200), an aerobic tank (300), and a sedimentation tank (400), characterized in that, The aerobic tank (300) is equipped with a packing device (310) that automatically adjusts the size of the working area of ​​the biological elastic packing material (313) as the water level rises and falls. The packing device (310) has A floater (311) floats on the surface of the aerobic pool (300) and rises and falls with the water level of the aerobic pool (300); A hook (312) is attached to the float (311) at one end, and the bio-elastic filler (313) is fixed thereon. The bio-elastic filler (313) extends along the length of the hook (312). A steel rope (330) is fixed at both ends to the inner wall of the aerobic tank (300), and its rope body is connected to the bottom end of the hook (312). The aerobic tank (300) is provided with a third water outlet (340) and a fourth water outlet (350) at different heights. The third water outlet (340) is connected to the first connecting pipe (341), and the fourth water outlet (350) is connected to the second connecting pipe (351). A first electric butterfly valve (342) is provided on the first connecting pipe (341), and the first electric butterfly valve (342) controls the opening and closing of the first connecting pipe (341); A second electric butterfly valve (352) is provided on the second connecting pipe (351), and the second electric butterfly valve (352) controls the opening and closing of the second connecting pipe (351); The wastewater treatment capacity of the aerobic tank (300) is switched by controlling the opening and closing of the first electric butterfly valve (342) and the second electric butterfly valve (352); The aerobic tank (300) is provided with a fifth connecting pipe (810) that connects to the sedimentation tank (400). The inlet of the fifth connecting pipe (810) is connected to a liquid level adaptive regulating device (800). The liquid level adaptive regulating device (800) has a water regulating tank (820) and a float (830). The water regulating tank (820) includes a main water tank (821) and a secondary water tank (822). The main water tank (821) has several water inlets (823) along its height circumference. The secondary water tank (822) has an outlet (823) that connects to the main water tank (821). 4) The float (830) is connected inside the main water tank (821), and its outer periphery is attached to the inner wall of the main water tank (821) to block the water inlet (823) on the main water tank (821) to limit the number of opening and closing of the water inlet (823); the main water tank (821) is provided with a slot (825), one end of the fixed arm (840) is connected to the float (830), and the other end passes through the slot (825) and is fixed to the float (311). The float (830) is driven to rise and fall inside the main water tank (821) by the rise and fall of the water surface by the float (311).

2. The rural sewage integrated treatment equipment with switchable scale according to claim 1, characterized in that, The floater (311) is a planar floating body formed by connecting several hollow tubes. The floating body floats on the surface of the aerobic pool (300), and several hooks (312) are suspended below it.

3. The rural sewage integrated treatment equipment with switchable scale according to claim 2, characterized in that, Several aeration valves are provided below the packing device (310). The aeration valves generate bubbles that pass through the bio-elastic packing material (313) to supply oxygen to the microorganisms on it.

4. The rural sewage integrated treatment equipment with switchable scale according to claim 1, characterized in that, The third water outlet (340) and the fourth water outlet (350) are respectively provided with water outlet channels (360). The water outlet channel (360) has a weir plate (361). The two ends of the weir plate (361) are sealed and connected to the inner wall of the aerobic tank (300) to separate the water inlet of the first connecting pipe (341) or the water inlet of the second connecting pipe (351) from the water in the aerobic tank. The top of the weir plate (361) is serrated.

5. The rural sewage integrated treatment equipment with switchable scale according to claim 4, characterized in that, The aerobic tank (300) is equipped with a mixed liquor return pipe (370). One end of the mixed liquor return pipe (370) is located at the bottom of the aerobic tank (300), and the other end is connected to the anoxic tank (200) to return the mixed liquor at the bottom of the aerobic tank (300) to the anoxic tank (200).

6. The rural sewage integrated treatment equipment with switchable scale according to claim 1, characterized in that, The main water tank (821) is provided with a limiting hole (860) along its height direction, and a limiting pin (850) is connected in the limiting hole (860).

7. A method for integrated rural sewage treatment with switchable scale, characterized in that, The method of using the switchable-scale integrated rural sewage treatment equipment according to any one of claims 1-6 includes the following steps: S1: Monitor sewage flow, collect sewage flow per unit time, compare the collected sewage flow with the preset value, define sewage flow exceeding the preset value as the peak sewage treatment period, and define sewage flow not exceeding the preset value as the low sewage treatment period. S2: Phosphorus release and denitrification treatments are carried out in the anaerobic tank (100) and anoxic tank (200) to degrade and reduce the nitrogen content in the wastewater; S3: The wastewater is treated to remove organic matter in the aerobic tank (300); and a third water outlet (340) and a fourth water outlet (350) of different heights are set in the aerobic tank (300). The wastewater treatment volume in the aerobic tank (300) is controlled by controlling the opening and closing of the third water outlet (340) and the fourth water outlet (350). S4: Sludge-water separation is performed in the sedimentation tank (400), and a fifth water outlet (420) and a sixth water outlet (430) of different heights are set in the sedimentation tank (400). The sewage treatment volume in the sedimentation tank (400) is controlled by controlling the opening and closing of the sixth water outlet (430); the supernatant separated in the sedimentation tank (400) flows into the clear water tank (500) for storage. In step S3, during the low period of wastewater treatment, the second electric butterfly valve (352) on the second connecting pipe (351) is opened to keep the aerobic tank (300) at a low water level; during the peak period of wastewater treatment, the electric butterfly valve on the second connecting pipe (351) is closed and the first electric butterfly valve (342) on the first connecting pipe (341) is opened to keep the aerobic tank (300) at a high water level. In step S4, during the low period of wastewater treatment, the third electric butterfly valve (432) on the fourth connecting pipe (431) is opened to keep the sedimentation tank (400) at a low water level; during the peak period of wastewater treatment, the third electric butterfly valve (432) on the fourth connecting pipe (431) is closed to keep the sedimentation tank (400) at a high water level. A packing device (310) is installed in the aerobic tank (300). The packing device (310) adaptively adjusts the size of its biological elastic packing (313) working area according to the water level to meet the treatment needs of sewage at different water levels.

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