Regulating tank for rural sewage treatment and method for automatically regulating sewage by using regulating tank

Abstract

The invention relates to the technical field of sewage treatment, in particular to an adjusting tank for rural sewage treatment and an automatic sewage adjusting method thereof.The adjusting tank comprises a tank body, the tank body comprises a grating interception area, an adjusting area and a sludge storage area, and the areas form independent areas through shared retaining walls. The grating interception area is located on the water inlet side close to the tank body, and sewage in the grating interception area enters the adjusting area from a water passing hole in the bottom after being preliminarily intercepted and filtered. The sludge storage area is located on the side close to the water outlet side of the pool body, and a sludge lifting system and a sewage lifting system are sequentially arranged at the position, close to the sludge storage area, of the adjusting area. The sewage lifting system can convey sewage to the biochemical pool, and the sludge lifting system can pump sludge at the bottom of the pool into the sludge storage area, so that the stock of sediments in the adjusting area is effectively reduced, the effective volume and the adjusting function of the adjusting pool are ensured, the impurity content of a water body is further reduced, and the water quality and the water quantity of inlet water of the biochemical pool are ensured; the stability of the treatment efficiency of the biochemical pool is improved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a regulating tank for rural wastewater treatment and a method for automatically regulating wastewater thereon. Background Technology

[0002] With the steady advancement of the Beautiful Countryside Construction project and the continuous improvement of the rural living environment, rural sewage treatment equipment technology has made significant progress. However, due to the dispersed distribution of rural households and relatively limited funds, the construction of rural sewage pipe networks is extremely inadequate. Given the unsuitability for large-scale sewage pipe network construction, a model of small-scale decentralized collection and centralized treatment is currently widely adopted. Influenced by factors such as daily routines and periodic population movement, the volume and quality of rural sewage fluctuate significantly. These changes can severely impact the biological treatment system. Therefore, regulating tanks are generally installed at the upstream end of rural sewage treatment facilities to regulate the water quality and quantity of influent to subsequent treatment units, improve the stability of the treatment efficiency of subsequent biological treatment tanks, and ensure that the effluent consistently meets discharge standards.

[0003] Due to funding constraints, rural sewage pipe networks generally adopt a combined sewer system. To reduce costs or facilitate construction, some networks use open channels for collecting sewage, resulting in large amounts of garbage, sludge, and agricultural waste being mixed into the equalization tanks, leading to the accumulation of large quantities of physicochemical sludge. Furthermore, since most rural sewage treatment plants operate unattended and lack dedicated sludge dewatering machines, subsequent treatment relies on external transportation or mobile sludge dewatering trucks. Excess sludge from the biological treatment tanks is typically discharged into sludge storage tanks periodically. Once the sludge storage tanks reach full capacity, a large amount of excess sludge will flow into the equalization tanks through the plant's pipe network when unattended. If not dredged promptly, this sludge will gradually fill the equalization tanks, reducing their regulating capacity. Simultaneously, the sludge will clog lift pumps and other mechanical equipment. Sludge overflow into the biological treatment system will also increase operating costs and may even cause the system to malfunction, seriously jeopardizing the normal operation of rural sewage treatment plants. Regular manual dredging of the equalization tank would significantly increase operating costs, and the inlet water must be shut off during dredging, posing a risk of sewage overflow. Furthermore, dredging the equalization tank is a confined space operation, increasing the difficulty of manual work and creating safety hazards.

[0004] Therefore, there is an urgent need for a regulating tank that can automatically clean the sludge accumulated at the bottom of the tank on a regular basis. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a regulating tank for rural sewage treatment and a method for automatically regulating sewage, which solves the problem that traditional regulating tanks cannot automatically clean the sludge at the bottom of the tank and require manual cleaning after the water inlet is shut off.

[0007] Technical issues.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0010] In a first aspect, the present invention provides a regulating tank for rural sewage treatment, comprising a tank body for storing rural sewage. The tank body includes a screen interception zone, a regulating zone, and a sludge storage zone, with each zone forming an independent area via a shared retaining wall. The screen interception zone is located near the inlet of the tank body, where sewage, after preliminary interception and filtration, enters the regulating zone through a bottom perforation. The sludge storage zone is located near the outlet of the tank body. A sludge lifting system and a sewage lifting system are sequentially installed in the regulating zone near the sludge storage zone. The sewage lifting system can transport sewage to a subsequent biological treatment tank, and the sludge lifting system can pump sludge from the bottom of the tank into the sludge storage zone.

[0011] Optionally, the wastewater lifting system includes a pump base platform, a wastewater lifting pump, a wastewater level gauge, and a wastewater delivery pipe. The pump base platform is located at the effluent end of the regulating zone. The wastewater lifting pump is installed on the pump base platform. One end of the wastewater delivery pipe is connected to the wastewater lifting pump, and the other end is used to connect to the biological treatment tank. The wastewater level gauge is installed at the top of the tank corresponding to the pump base platform.

[0012] Optionally, the sludge lifting system is located at the intersection of the sludge storage area and the wastewater lifting system, and includes a sludge lifting pump, a sludge conveying pipe, and a first sludge level gauge. The sludge lifting pump is installed at the bottom of the tank, and one end of the sludge conveying pipe is connected to the sludge lifting pump, while the other end is connected to the sludge inlet of the sludge storage area. The first sludge level gauge is installed near the sludge lifting pump, with its sensing end positioned above the top surface of the pump base platform.

[0013] Optionally, a stirrer is also provided in the conditioning zone. The stirrer is installed at the bottom of the conditioning zone and is located in the middle area along the direction from the bar screen area toward the sludge storage area.

[0014] Optionally, the sludge storage area includes a sludge pumping system, an overflow orifice, and a second sludge level gauge. The sludge pumping system can pump the sludge from the sludge storage area to the outside of the tank. The overflow orifice is located on the shared wall of the sludge storage area and the equalization area, near the top of the tank, and can return the supernatant in the sludge storage area to the equalization area. The second sludge level gauge is located in the middle of the sludge storage area, at a height close to and below the overflow orifice.

[0015] Optionally, an irregularly conical sludge collection pit is provided at the bottom of the sludge storage area. The sludge pumping system includes a sludge pumping pump and a sludge pumping pipe. The sludge pumping pump is located at the bottom of the sludge collection pit, and one end of the sludge pumping pipe is connected to the sludge pumping pump, while the other end extends to the outside of the tank.

[0016] Optionally, the sludge storage area is further equipped with a flow guiding assembly, which includes a flow guiding plate and a residual sludge overflow pipe. The flow guiding plate is located at the sludge inlet end of the sludge storage area, extending from the top of the tank into the sludge collection pit. Both ends of the flow guiding plate are fixed to the tank wall, forming a channel for sludge inflow between it and the tank wall near the sludge lifting system, and its bottom side plate is parallel to the corresponding side wall in the sludge collection pit. The residual sludge overflow pipe is connected to the sludge inlet end of the sludge storage area to receive sludge overflowing from the biological treatment tank.

[0017] Optionally, a turbidity meter is also provided in the sludge storage area. The turbidity meter is installed on the pool wall of the sludge storage area, and its height is flush with the bottom of the overflow hole.

[0018] Secondly, this invention provides a method for automatically regulating sewage in a regulating tank for rural sewage treatment. The method utilizes any of the aforementioned regulating tanks and control systems for rural sewage treatment to automatically regulate the sewage in the tank. Liquid level and a first sludge level are measured near the sewage lifting system within the regulating zone. A second sludge level is measured within the sludge storage area. The control system can acquire the liquid level, first sludge level, and second sludge level in real time and control the start and stop of the sewage lifting system and the sludge lifting system.

[0019] Optionally, the start and stop of the wastewater lifting system depends on the liquid level, as follows:

[0020] If the liquid level is lower than the protection level, the sewage lifting system will be shut down; if the liquid level is higher than the start level, the sewage lifting system will be started.

[0021] The start-up and shutdown of the sludge lifting system depend on the first sludge level value, the second sludge level value, the turbidity value, and the start-up and shutdown of the wastewater lifting system, as detailed below:

[0022] When the second sludge level is greater than or equal to 80% of the depth of the sludge storage area, the sludge lifting system is shut down, and the discharge of sewage from the biological treatment tank is prohibited, and an early warning is issued that the sludge storage area is full.

[0023] When the second sludge level is less than 80% of the depth of the sludge storage area, if the first sludge level is less than or equal to 0.3m, the sludge lifting system is shut down. If the first sludge level is greater than 0.3m and the wastewater lifting system is shut down, the sludge lifting system is turned on. If the first sludge level is greater than 0.3m and the wastewater lifting system is turned on, the sludge lifting system is turned on for 10min / 2h.

[0024] (III) Beneficial Effects

[0025] The beneficial effects of this invention are:

[0026] This invention discloses a regulating tank for rural sewage treatment and a method for automatically regulating sewage. On one hand, it provides a regulating tank for rural sewage treatment. By dividing the tank into sections, it includes a separate sludge storage area. Combined with a sludge lifting system and a sewage lifting system, sludge is collected in the sludge storage area, while sewage with less sludge is transported to the subsequent biological treatment tank. This effectively reduces the amount of sediment in the regulating area, ensuring the effective volume and regulating function of the tank, thereby reducing the impurity content in the water, decreasing the risk of blockage of the lifting pump by foreign objects and the incidence of malfunction, and ensuring the quality and quantity of water entering the subsequent treatment unit, thus improving the stability of the treatment efficiency of the subsequent biological treatment tank. Simultaneously, the combined tank structure effectively reduces the land acquisition area and lowers the site's civil engineering costs.

[0027] On the other hand, a method for automatically regulating sewage in equalization tanks for rural sewage treatment is provided. This method uses a control system to automatically control the sewage lifting system and sludge lifting system within the equalization tank, enabling the equalization tank to automatically perform regular sludge removal. This effectively avoids the adverse effects of accumulated sludge on mechanical equipment and the biological system, ensuring the normal and stable operation of the sewage treatment plant, reducing the difficulty of manual operations and minimizing safety hazards. Furthermore, it avoids the risk of sewage overflow and other safety risks caused by the equalization tank cleaning process. Attached Figure Description

[0028] Figure 1 This is a top view schematic diagram of Embodiment 1 of the present invention, which describes a regulating tank for rural sewage treatment and a method for automatically regulating sewage.

[0029] Figure 2 for Figure 1 A magnified view of a portion of the grid interception area in the regulating pool;

[0030] Figure 3 for Figure 1 A schematic cross-sectional view of the regulating tank at point AA;

[0031] Figure 4 for Figure 1 A partial enlarged view of the equalization zone and sludge storage zone in the equalization tank;

[0032] Figure 5 for Figure 1 A schematic cross-sectional view of the regulating tank at point BB;

[0033] Figure 6 for Figure 1 A cross-sectional view of the regulating tank at CC;

[0034] Figure 7 This is a control flowchart of Embodiment 2 of the present invention, which describes a regulating tank for rural sewage treatment and a method for automatically regulating sewage.

[0035] [Explanation of Labels in the Attached Image]

[0036] 1: Bar screen interception area; 11: Water passage tunnel; 12: Intake gate; 121: Hoist; 122: Guide rod; 123: Gate; 13: Intake channel; 14: Mechanical bar screen; 15: Manual ultrafine bar screen;

[0037] 2: Adjustment zone; 21: Sewage lifting system; 211: Pump base platform; 212: Sewage lifting pump; 213: Sewage level gauge; 22: Sludge lifting system; 221: Sludge lifting pump; 222: Sludge conveying pipe; 223: First sludge level gauge; 23: Agitator; 24: Valve well; 241: Valve; 242: Combination pipe;

[0038] 3: Sludge storage area; 31: Sludge pumping system; 311: Sludge pumping pump; 312: Sludge pumping pipe; 32: Overflow hole; 33: Second sludge level gauge; 34: Sludge collection pit; 35: Flow guiding assembly; 351: Flow guide plate; 352: Excess sludge overflow pipe; 36: Turbidity meter;

[0039] 4: Inspection port; 41: Cover plate; 42: Ladder;

[0040] 10: Pool body. Detailed Implementation

[0041] To better explain and facilitate understanding of the present invention, a detailed description of the invention is provided below with reference to the accompanying drawings and specific embodiments. In this document, directional terms such as "up," "down," "left," and "right" are used interchangeably. Figure 1 The orientation is used as a reference.

[0042] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0043] Example 1:

[0044] Reference Figure 1This embodiment provides an equalization tank for rural sewage treatment, which is mainly used in decentralized or centralized rural sewage treatment plants. It includes a tank body 10 for storing rural sewage. The tank body 10 includes a bar screen interception area 1, an equalization area 2 and a sludge storage area 3. Each area is separated into independent areas by a shared retaining wall.

[0045] like Figure 2 and Figure 3 As shown, the projected area of ​​the bar screen interception zone 1 on the ground is relatively small, accounting for only about 1 / 6 to 1 / 8 of the entire pool 10, and it is located on the side near the water inlet of the pool 10. The bar screen interception zone 1 includes a water passage 11, an inlet gate 12, an inlet channel 13, a mechanical bar screen 14, and an artificial ultrafine bar screen 15. The inlet gate 12 is used to cut off the water intake to the station when the regulating pool is under maintenance or equipment is replaced. It consists of a hoist 121, a guide rod 122, and a gate 123. The gate 123 serves as the interception component at the system's inlet end, and its downstream end connects to the inlet channel 13. The inlet channel 13 is designed for gravity flow, and it does not require an additional slope. It relies on the natural elevation difference of the pipeline inlet (i.e., the upstream pipeline water level is higher than the channel inlet) to create gravity drive. Under the action of gravity, the sewage flows into the channel and continues to be transported to the downstream mechanical bar screen 14 and artificial ultrafine bar screen 15. Of course, a certain slope can also be set in the inlet channel 13 to ensure that the sewage can flow smoothly downstream. The mechanical screen 14 is installed in the inlet channel 13. It mainly intercepts larger screenings and protects the subsequent artificial ultrafine screen 15 and supporting equipment. The screen spacing is preferably 10mm-20mm. The artificial ultrafine screen 15 is installed in the inlet channel 13 downstream of the mechanical screen 14. It mainly intercepts small screenings, such as fibrous hair, melon seed shells, plant roots, etc., to further protect the subsequent mechanical equipment and reduce the formation of scum in the sewage conditioning zone 2. The screen spacing is preferably 4mm-6mm. The water passage 11 is located at the bottom of the inlet channel 13 downstream of the artificial ultrafine screen 15 in the screen interception zone 1, so that the sewage in the screen interception zone 1 enters the conditioning zone 2 through the water passage 11 at the bottom after preliminary interception and filtration.

[0046] The regulating zone 2 is mainly used to regulate water volume and quality, as well as to settle rainwater sludge mixtures, thereby reducing the likelihood of equipment blockage, preventing sludge from entering the subsequent biological treatment system, and protecting the stable operation of the biological treatment system. Its volume should meet the total water accumulation requirement for approximately 6-12 hours at the designed influent flow rate. The specific volume can be determined based on the actual application scenario in different regions, and will be affected by regional climate conditions (such as rainfall characteristics and temperature) and the actual drainage situation in the region. Its specific design can be obtained through methods well-known to those skilled in the art, and will not be elaborated here.

[0047] The sludge storage area 3 is located on the opposite side of the bar screen interception area 1, that is, on the side closer to the effluent outlet of the tank body 10. A sludge lifting system 22 and a wastewater lifting system 21 are sequentially installed in the regulating area 2 near the sludge storage area 3. The wastewater lifting system 21 can transport wastewater to the subsequent biological treatment tank, while the sludge lifting system 22 can pump sludge from the bottom of the tank into the sludge storage area 3.

[0048] As an optional embodiment, the sludge storage area 3, the sludge lifting system 22, and the wastewater lifting system 21 are arranged parallel to the water flow direction of the bar screen interception area 1. The bottom of the regulating area 2 has a slope of 0.5%-1.0% along the direction from the bar screen interception area 1 to the sludge storage area 3 and along the water flow direction of the bar screen interception area 1 (i.e., from the sludge storage area 3 to the wastewater lifting system 21). Simultaneously, a stirrer 23 is installed in the regulating area 2, located at the bottom of the regulating area 2 in the middle region along the direction from the bar screen interception area 1 to the sludge storage area 3. Periodically activating the stirrer 23 effectively agitates the wastewater in the regulating area 2, thereby regulating water quality and preventing sludge sediment from accumulating at the bottom and failing to circulate and discharge. For example, when the sludge level in adjustment zone 2 is below 0.3m, turning on agitator 23 allows for thorough mixing of the water, thus regulating the water quality. When the sludge level in adjustment zone 2 is above 0.3m, agitator 23 needs to be turned on periodically when no water is being added. This, combined with the slope of the bottom of adjustment zone 2, ensures that the sludge deposits at the bottom of adjustment zone 2 automatically collect near the sludge lifting system 22 (the coordination between agitator 23 and the slope of adjustment zone 2 refers to the mixing of sludge and water by agitator 23, which then flows downhill along the slope of the bottom of adjustment zone 2). The sludge is then pumped into sludge storage zone 3 via the sludge lifting system 22 for external transport or dewatering. Preferably, agitator 23 is positioned diagonally opposite the inlet of adjustment zone 2 to provide better mixing.

[0049] Furthermore, such as Figure 4 and Figure 5As shown, the sewage lifting system 21 includes a pump base platform 211, a sewage lifting pump 212, a sewage level gauge 213, and a sewage delivery pipe 214. The pump base platform 211 is located at the outlet end of the regulating zone 2, specifically on the side of the regulating zone 2 that is the same as the water passage 11 and away from the screen interception zone 1, i.e., the lowest area of ​​the pool bottom with a slope within the regulating zone 2. The height of the pump base platform 211 is preferably set to 80cm from the pool bottom. Furthermore, the sewage lifting pump 212 is installed on the pump base platform 211, away from the pool bottom where sediment is most easily accumulated, so that the lower space can be used to store sludge sediment accumulated during the rainy season, reducing the risk of the sewage lifting pump 212 sucking in sediment. This ensures that the pump can draw water from a relatively upper layer with fewer impurities, avoiding damage to the sewage lifting pump 212 from incoming water impurities, and also facilitating the installation, inspection, and maintenance of the sewage lifting pump 212. One end of the sewage delivery pipe 214 is connected to the sewage lifting pump 212, and the other end is used to connect to the biological treatment tank. Figure 6 As shown, a valve well 24 can preferably be installed in the foundation pit platform adjacent to the equalization tank (i.e., outside the tank body 10, near the sewage lifting system 21). This provides space for installing valves and gate valves on the sewage delivery pipe 214, preventing sewage backflow from damaging the sewage lifting pump 212. The valve well 24 is a waterless space, allowing operators to enter for inspection or manual adjustment. Specifically, the sewage lifting pump 212 is installed on the pump base platform 211 via a coupler and connects to valves 241 via the sewage delivery pipe 214 extending into the valve well 24. Depending on actual needs, multiple sewage lifting pumps 212 can be installed, each connected to multiple valves 241 via corresponding sewage delivery pipes 214 extending into the valve well 24. Each valve 241 can individually control the opening and closing of a single pipeline. Furthermore, the multiple sewage delivery pipes 214 connected to the valves 241 are all connected to a confluence pipe 242, through which sewage is transported to the subsequent biological treatment tank. The wastewater level gauge 213 is installed at the top of the pool corresponding to the pump base platform 211. The start and stop of the wastewater lift pump 212 can be controlled by the liquid level range displayed above the pump base platform 211. This wastewater level gauge 213 is preferably an ultrasonic level gauge. It determines the distance between the probe and the liquid surface by calculating the time it takes for high-frequency sound waves to travel from emission to reflection from the liquid surface (or material surface) and back, and then calculates the liquid level height. Ultrasonic level gauges are simple to install and easy to maintain, and because they do not come into contact with the measured medium, they effectively avoid corrosion and other problems.

[0050] The sludge lifting system 22 is located at the intersection of the sludge storage area 3 and the wastewater lifting system 22. It includes a sludge lifting pump 221, a sludge conveying pipe 222, and a first sludge level gauge 223. The sludge lifting pump 221 is installed at the bottom of the tank and is a cutting pump with a coupler (i.e., a cutting pump with a coupled installation method). One end of the sludge conveying pipe 222 is connected to the sludge lifting pump 221, and the other end is connected to the sludge inlet of the sludge storage area 3. The first sludge level gauge 223 is installed near the sludge lifting pump 221, with its detection end positioned above the top surface of the pump base platform 211. It is used to indicate the sludge level at the bottom of the tank in the regulating area 2 and to avoid interference from the platform structure.

[0051] like Figure 5 As shown, the sludge storage area 3 includes a sludge pumping system 31, an overflow hole 32, a second sludge level gauge 33, a sludge collection pit 34, a flow guiding component 35, and a turbidity meter 36. The capacity of the sludge storage area 3 is calculated based on the amount of residual sludge that can be held for 15 days at the plant, which can be calculated by those skilled in the art based on the actual discharge volume under actual usage scenarios.

[0052] An irregularly conical sludge collection pit 34 is located at the bottom of the sludge storage area 3, with slopes on three sides at angles between 55° and 60°. The sludge pumping system 31 includes a sludge pumping pump 311 and a sludge pumping pipe 312. The sludge pumping pump 311 is a cutting pump installed in a coupled manner and is located at the bottom of the sludge collection pit 34. One end of the sludge pumping pipe 312 is connected to the sludge pumping pump 311, and the other end extends to the outside of the tank body 10, enabling the sludge pumping system 31 to pump the sludge from the sludge storage area 3 to the outside of the tank body 10 for treatment.

[0053] The flow guiding assembly 35 includes a flow guiding plate 351 and a residual sludge overflow pipe 352. The flow guiding plate 351 is mainly used to guide the water flow direction and promote sludge sedimentation. It is located at the sludge inlet end of the sludge storage area 3, with both ends fixed to the pool wall of the sludge storage area 3, and extends from the top of the pool into the sludge collection pit 34 (i.e., its top is parallel to the pool surface, and its bottom is connected to the sludge collection pit 34). Its bottom side plate is parallel to the corresponding side wall inside the sludge collection pit 34. The flow guiding plate 351 forms a channel for sludge inflow with the pool wall near the sludge lifting system 21. The flow guiding plate 351 is preferably made of 304 stainless steel. The residual sludge overflow pipe 352 is connected to the sludge inlet end of the sludge storage area 3 and is used to receive sludge overflowing from the biological treatment tank. Furthermore, the sludge from the sludge conveying pipe 222 and the residual sludge overflow pipe 352, after being guided by the flow guiding plate 351, enters the bottom of the sludge storage area 3 for sedimentation.

[0054] The overflow hole 32 is located on the shared wall of the sludge storage area 3 and the conditioning area 2, and is located near the top of the pool. In this embodiment, it is preferred that the top of the overflow hole 32 is 30cm away from the top of the pool body 10, and the hole diameter is 200mm-300mm. It can return the supernatant in the sludge storage area 3 to the conditioning area 2. When overflowing, a small amount of sludge may flow back into the conditioning area 2.

[0055] The second sludge level gauge 33 is located in the middle of the sludge storage area 3, at a height close to and below the overflow hole 32, and is used to indicate the sludge level in the sludge storage area 3.

[0056] The turbidity meter 36 is installed on the wall of the sludge storage area 3, and its height is flush with the bottom of the overflow hole 32. When the turbidity value detected by the meter changes abruptly, the sludge lift pump 221 can be stopped and the discharge of sludge from the biological treatment tank can be prohibited. This is mainly to prevent sludge and upper floating sludge from overflowing into the conditioning area 2 through the overflow hole 32.

[0057] like Figure 6 As shown, to ensure the normal operation of equipment in each area of ​​the equalization tank, access ports 4 can be selectively installed in each area, allowing maintenance personnel to enter the tank body 10 for regular maintenance and repair work. Specifically, one access port 4 can be installed in each of the bar screen interception area 1, the equalization area 2, and the sludge storage area 3. The access ports 4 should be located as far away from the pumps as possible to avoid interference. Furthermore, a ladder 42 extending to the bottom of the tank is provided below the access port 4, and a cover plate 41 is placed on the access port 4. The cover plate 41 is preferably made of concrete, galvanized sheet, or fiberglass grating to prevent personnel from accidentally falling.

[0058] The equalization tank shown in this embodiment divides the tank body 10 into zones. The combined tank body 10 can effectively reduce the land area required and allows the equalization tank to have a separate sludge storage area 3. With the operation of the sludge lifting system 22 and the sewage lifting system 21, sludge can be collected in the sludge storage area 3, and sewage with a small amount of sludge can be transported to the subsequent biological treatment tank. This effectively reduces the amount of sediment in the equalization zone 2, ensures the effective volume and equalization function of the equalization tank, thereby reducing the impurity content of the water, reducing the risk of the sewage lifting pump 212 being blocked by foreign objects and the occurrence rate of failure, and ensuring the water quality and quantity of the influent to the subsequent treatment unit, thus improving the stability of the treatment efficiency of the subsequent biological treatment tank. Furthermore, in conjunction with the sludge pumping system 31, the sludge collected in the sludge storage area 3 is discharged outside the equalization tank for treatment, avoiding the need for water outages and manual cleaning. The entire process can be carried out in a cyclical manner without water outages. This not only effectively solves the problem of the equalization tank being unable to perform its water quality and quantity regulation function properly due to the accumulation of impurities in the incoming water, but also further reduces the workload of manual inspection and sludge removal. This not only improves operation and maintenance efficiency and reduces the civil engineering and operating costs of the station, but also enhances the stability of the station's process operation and avoids the risk of sewage overflow.

[0059] Example 2:

[0060] Reference Figure 7 This embodiment provides a method for automatically regulating sewage in a regulating tank for rural sewage treatment. It utilizes any of the regulating tanks and control systems for rural sewage treatment in Embodiment 1 to automatically regulate the sewage in the tank. The control system obtains relevant information about each area within the regulating tank, thereby automatically controlling the start and stop of the sewage lifting system 21 and the sludge lifting system 22.

[0061] Specifically, the system measures the liquid level H and the first sludge level S1 near the sewage lifting system 21 in the regulating zone 2, and measures the second sludge level S2 in the sludge storage zone 3. This control system can acquire the liquid level H, the first sludge level S1, and the second sludge level S2 in real time, and control the start and stop of the sewage lifting system 21 and the sludge lifting system 22. The liquid level H is measured by the sewage level gauge 213, the first sludge level S1 is measured by the first sludge level gauge 223, and the second sludge level S2 is measured by the second sludge level gauge 33. Furthermore, starting and stopping the sewage lifting system 21 refers to turning on or off the sewage lifting pump 212, and starting and stopping the sludge lifting system 22 refers to turning on or off the sludge lifting pump 221. Moreover, the sewage level gauge 213, the first sludge level gauge 223, the second sludge level gauge 33, the sewage lifting pump 212, and the sludge lifting pump 221 are all electrically connected to the control system.

[0062] In this embodiment, preferably, the stirrer 23 described in Embodiment 1 is provided in the adjustment zone 2, and the turbidimeter 36 described in Embodiment 1 is provided in the sludge storage zone 3. Furthermore, the stirrer 23 is electrically connected to the control system, so that the control system can control the start and stop of the stirrer 23; the turbidimeter 36 is also electrically connected to the control system, so that the control system can obtain the turbidity value T in the turbidimeter 36 in real time.

[0063] The following details the control system's control over the wastewater lifting system 21, the sludge lifting system 22, and the agitator 23:

[0064] The start and stop of the sewage lifting system 21 depends on the liquid level H, as follows:

[0065] If the liquid level H is less than the protection liquid level Hp, the sewage lifting system 21 is shut down; if the liquid level H is greater than the start liquid level Hs, the sewage lifting system 21 is started.

[0066] The protection level Hp, also known as the stop level, refers to the level at which the pump is completely submerged, and it is preferably set between 0.5m and 0.8m.

[0067] The starting liquid level Hs is preferably set within the range of being greater than the protection liquid level Hp and less than or equal to the sum of the ratios of the protection liquid level Hp and the single-unit biological treatment water volume q to the equalization tank area S (i.e., Hp < Hs ≤ Hp + 1 × q / S, where Hp, Hs, and q are all in meters). 3 / d, the unit of S is m 3 ).

[0068] The start and stop of the agitator 23 depend on the first sludge level S1 and the start and stop of the sewage lifting system 21, as follows:

[0069] When the first mud level value S1 is less than or equal to 0.3m:

[0070] If the sewage lifting system 21 is in the off state, then the agitator 23 is turned off;

[0071] If the sewage lifting system 21 is in the open state, the agitator 23 is turned on. Because the sludge accumulated in the regulating zone 2 is small at this time, it is not enough to affect the subsequent biological system. Therefore, the agitator 23 needs to be turned on continuously to ensure that the water in the regulating zone 2 and the influent are fully mixed.

[0072] When the first mud level value S1 is greater than 0.3m:

[0073] If the sewage lifting system 21 is closed, turn on the agitator 23 for fifteen minutes to fully mix the sludge deposited in the regulating zone 2;

[0074] If the sewage lifting system 21 is in the on state, then the agitator 23 is turned off.

[0075] The start and stop of the sludge lifting system 22 depend on the first sludge level value S1, the second sludge level value S2, the turbidity value T, and the start and stop of the wastewater lifting system 21, as detailed below:

[0076] When the second sludge level value S2 is greater than or equal to 80% of the depth of sludge storage area 3:

[0077] The system shuts down the sludge lifting system 22, prohibits sludge discharge from the biological treatment tank, and issues a warning that the sludge storage area 3 is full. The prohibition of sludge discharge from the biological treatment tank can be achieved by installing a control valve on the excess sludge overflow pipe 352 connecting the sludge storage area 3 to the biological treatment tank, and electrically connecting this control valve to the control system; that is, controlling the valve to close. Furthermore, the control system can issue an alarm or send specific information to relevant personnel to warn that the sludge storage area 3 is full, so that operators can promptly remove the sludge from the sludge storage area 3 for subsequent dewatering or off-site treatment.

[0078] When the second sludge level S2 is less than 80% of the depth of sludge storage area 3:

[0079] If the first sludge level S1 is less than or equal to 0.3m, then the sludge lifting system 22 shall be shut down.

[0080] If the first sludge level S1 is greater than 0.3m and the wastewater lifting system 21 is closed, turn on the agitator 23 for fifteen minutes to fully mix the sludge deposited in the equalization zone 2. Then turn on the sludge lifting system 22 to pump the sludge mixture in the equalization zone 2 to the sludge storage zone 3 for sedimentation until the sludge level in the equalization zone 2 is below 0.3m or the sludge level in the sludge storage zone 3 reaches 80% of the tank depth. If the turbidity value T is greater than 100mg / L during the operation of the sludge lifting system 22, the sludge lifting system 22 needs to be turned off, allowed to stand for one hour, and then restarted.

[0081] If the first sludge level S1 is greater than 0.3m and the wastewater lifting system 21 is in the open state, the sludge lifting system 22 shall be turned on for ten minutes every two hours to periodically pump the sludge in the adjustment zone 2 into the sludge storage zone 3 until the sludge level in the adjustment zone 2 is lower than 0.3m or the sludge level in the sludge storage zone 3 reaches 80% of the tank depth. If the turbidity value T is greater than 100mg / L during the operation of the sludge lifting system 22, the sludge lifting system 22 shall be turned off, allowed to stand for one hour, and then turned on again.

[0082] When the second sludge level S2 is less than 80% of the depth of the sludge storage area 3, sludge discharge from the biological treatment tank is permitted. That is, the control valve installed on the excess sludge overflow pipe 352 is in the open state, allowing excess sludge from the biological treatment tank to enter the sludge storage area 3 through the overflow port of the biological treatment tank and the excess sludge overflow pipe 352.

[0083] The control method for the equalization tank shown in this embodiment enables the equalization tank to automatically carry out regular sludge removal, effectively avoiding the adverse effects of accumulated sludge on mechanical equipment and the biological system, ensuring the normal and stable operation of the wastewater treatment plant, reducing the difficulty of manual operations and minimizing safety hazards. At the same time, it also avoids the risk of wastewater overflow and other safety risks caused by the equalization tank cleaning process.

[0084] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0085] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0086] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0087] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0088] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A conditioning tank for rural sewage treatment, comprising a tank body (10) for storing rural sewage, characterized in that: the tank body (10) comprises a grid interception area (1), a conditioning area (2) and a sludge storage area (3), and each area is formed into an independent area by a shared retaining wall; the grid interception area (1) is located near the water inlet side of the tank body (10), and the sewage inside is preliminarily intercepted and filtered and then enters the conditioning area (2) from the water passage hole (11) at the bottom; the sludge storage area (3) is located near the water outlet side of the tank body (10); a sludge lifting system (22) and a sewage lifting system (21) are sequentially arranged near the sludge storage area (3) of the conditioning area (2); the sewage lifting system (21) can deliver sewage to a subsequent biochemical tank, and the sludge lifting system (22) can pump sludge at the bottom of the tank into the sludge storage area (3).

2. The conditioning tank for rural sewage treatment according to claim 1, characterized in that: the sewage lifting system (21) comprises a pump base platform (211), a sewage lifting pump (212), a sewage liquid level meter (213) and a sewage delivery pipe (214); the pump base platform (211) is located at the water outlet side end of the conditioning area (2), the sewage lifting pump (212) is installed on the pump base platform (211), one end of the sewage delivery pipe (214) is connected to the sewage lifting pump (212), and the other end is used for connecting the biochemical tank; and the sewage liquid level meter (213) is installed at a position on the top of the tank corresponding to the pump base platform (211).

3. The conditioning tank for rural sewage treatment according to claim 2, characterized in that: the sludge lifting system (22) is located at the intersection side of the sludge storage area (3) and the sewage lifting system (22), and comprises a sludge lifting pump (221), a sludge delivery pipe (222) and a first sludge level meter (223); the sludge lifting pump (221) is installed at a position on the bottom of the tank, one end of the sludge delivery pipe (222) is connected to the sludge lifting pump (221), and the other end is connected to the sludge inlet end of the sludge storage area (3); and the first sludge level meter (223) is installed near the sludge lifting pump (221), and the height position of the detection end of the first sludge level meter (223) is higher than the top surface of the pump base platform (211).

4. The conditioning tank for rural sewage treatment according to claim 1, characterized in that: a stirrer (23) is further arranged in the conditioning area (2).

5. The conditioning tank for rural sewage treatment according to claim 1, characterized in that: the sludge storage area (3) comprises a sludge pumping system (31), an overflow hole (32) and a second sludge level meter (33); the sludge pumping system (31) can pump sludge in the sludge storage area (3) out of the tank body (10). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The overflow hole (32) is located on the common wall of the sludge storage area (3) and the adjusting area (2) and is located near the top of the pool, which can return the supernatant in the sludge storage area (3) to the adjusting area (2); The second sludge level meter (33) is located in the middle of the sludge storage area (3), and the height is near the overflow hole (32) and below the overflow hole (32).

6. The adjusting tank for rural sewage treatment according to claim 5, characterized in that: The bottom of the sludge storage area (3) is provided with an irregularly conical sludge collection pit (34); The sludge pumping system (31) comprises a sludge pumping pump (311) and a sludge pumping pipe (312); The sludge pumping pump (311) is located at the bottom of the sludge collection pit (34), and the sludge pumping pipe (312) is connected to the sludge pumping pump (311) at one end and extends to the outside of the pool body (10) at the other end.

7. The adjusting tank for rural sewage treatment according to claim 6, characterized in that: The sludge storage area (3) is also provided with a flow guide assembly (35); The flow guide assembly (35) comprises a flow guide plate (351) and a residual sludge overflow pipe (352); The flow guide plate (351) is arranged at the inlet end of the sludge storage area (3) and extends from the top of the pool to the sludge collection pit (34); The flow guide plate (351) is fixed at both ends of the pool wall, and a channel for sludge inflow is formed between the flow guide plate and the pool wall near the sludge lifting system (21), and the bottom side plate is parallel to the corresponding side wall of the sludge collection pit (34); The residual sludge overflow pipe (352) is connected to the inlet end of the sludge storage area (3) to receive the sludge overflow from the biochemical tank.

8. The adjusting tank for rural sewage treatment according to claim 5, characterized in that: The sludge storage area (3) is also provided with a turbidity meter (36); The turbidity meter (36) is arranged on the pool wall of the sludge storage area (3) and is flush with the bottom of the overflow hole (32).

9. A method for automatically adjusting sewage in an adjusting tank for rural sewage treatment, characterized in that: The adjusting tank and control system according to any one of claims 1-8 are used to automatically adjust the sewage in the tank; The liquid level value (H) and the first sludge level value (S1) are measured near the sewage lifting system (21) in the adjusting area (2); The second sludge level value (S2) is measured in the sludge storage area (3); The control system can obtain the liquid level value (H), the first sludge level value (S1), and the second sludge level value (S2) in real time and control the start and stop of the sewage lifting system (21) and the sludge lifting system (22).

10. The method for automatically adjusting sewage in an adjusting tank for rural sewage treatment according to claim 9, characterized in that: The start and stop of the sewage lifting system (21) depends on the liquid level value (H), and the specific method is as follows: If the liquid level value (H) is less than the protection liquid level (Hp), the sewage lifting system (21) is closed, and if the liquid level value (H) is greater than the start liquid level (Hs), the sewage lifting system (21) is opened; The start and stop of the sludge lifting system (22) depend on the first sludge level value (S1), the second sludge level value (S2), the turbidity value (T) and the start and stop of the sewage lifting system (21), and the details are as follows: When the second sludge level value (S2) is greater than or equal to 80% of the pool depth of the sludge storage area (3), the sludge lifting system (22) is closed, the biochemical tank is prohibited to be discharged, the sludge storage area (3) is warned to be full, and the sludge lifting system (22) is opened for 10 minutes / 2 hours when the first sludge level value (S1) is greater than 0.3 m and the sewage lifting system (21) is in the opened state. When the second sludge level value (S2) is less than 80% of the pool depth of the sludge storage area (3), if the first sludge level value (S1) is less than or equal to 0.3 m, the sludge lifting system (22) is closed, if the first sludge level value (S1) is greater than 0.3 m and the sewage lifting system (21) is in the closed state, the sludge lifting system (22) is opened, and if the first sludge level value (S1) is greater than 0.3 m and the sewage lifting system (21) is in the opened state, the sludge lifting system (22) is opened for 10 minutes / 2 hours.

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