A decentralized emissions source wastewater collection-A 2 O process handling linkage system and method of handling

Abstract

The application discloses a sewage collection system for dispersed emission sources 2 O processing linkage system and processing method, the linkage system comprises: sewage pretreatment and pipe network collection system, A 2 O processing system and discharge system. The application solves the sewage collection problem caused by complex terrain in the sewage collection range by adopting negative pressure collection technology, improves the sewage collection efficiency, creatively applies the air stripping technology, the Venturi technology and the siphon technology to the sewage process, and only needs a self-priming pump to realize the sewage collection and A 2 O process of sewage lifting, sludge and water backflow and oxygenation; the Venturi jet device directly performs jet aeration on the aerobic tower, reduces the dependence on high-energy consumption mechanical aeration blower, avoids resource waste and material loss; meanwhile, the water flow and dissolved oxygen distribution of the reaction tank are optimized, natural circulation is formed between the aerobic tower and the anoxic tower through the density difference, no additional power is needed, the energy consumption is reduced, the denitrification and phosphorus removal process is promoted, and the treatment efficiency is significantly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a decentralized source sewage collection-A 2 O process treatment linkage system, belonging to the technical field of decentralized source sewage collection and treatment. BACKGROUND

[0002] In the prior art, the main method for collecting and treating sewage from decentralized sources is to lay municipal sewage pipe networks, which are treated by special sewage collection and treatment facilities. At present, sewage collection is basically gravity flow, and the most commonly used sewage treatment technology is the A 2 O process, which is a two-stage biochemical technology. The A 2 O process, namely Anaerobic-Anoxic-Oxic process, is a sewage treatment technology for simultaneous biological nitrogen and phosphorus removal. This process combines the processes of traditional activated sludge, biological nitrification and denitrification, and biological phosphorus removal, and can effectively remove organic matter, nitrogen and phosphorus in sewage. However, in the following two cases, the cost and construction difficulty of gravity flow pipe network laying increases sharply in complex terrain areas such as mountains and hills; secondly, for areas with dispersed population or small amount of sewage, the sewage discharge sources are dispersed, and the total sewage discharge is less than 100m³ / d, such as suburban residential areas, schools, markets, and rural areas, including centralized villages, communities, markets, holiday villages, tourist attractions, farmhouses, enterprises, small-scale towns with a population of less than 2000 people, etc. It is not economical and cost-effective to lay gravity flow drainage pipe networks in these areas, and the traditional A 2 O technology is prone to energy waste.

[0003] In the traditional gravity flow system, sewage needs to rely on gravity to flow from high to low. If there is a large elevation difference, multiple lift pump stations may need to be set up, increasing construction and operation costs. On the other hand, the traditional A 2 O process system is relatively passive in dealing with different treatment needs and changes in operating conditions. For example, when a treatment unit needs to be repaired or maintained, the flow direction and flow rate of the sewage may need to be adjusted. In addition, the traditional A 2 O treatment technology requires aeration blowers, aeration diffusion systems, reflux pumps, and sludge pumps, and other equipment, which requires high-quality materials and manufacturing processes, and needs to meet specific operating conditions, resulting in increased equipment procurement costs. In summary, the existing A 2 O technology has many problems, mainly including the following aspects:

[0004] 1) Problems in sewage collection (existing gravity flow pipe network collection method):

[0005] a. The traditional sewage treatment process uses cement pipes for household pipe network. In order to ensure that the sewage can flow by gravity in the pipe network, the pipe must be laid with a certain slope forward during laying. The trench excavation depth and width are very large, resulting in a large amount of construction, especially when encountering slopes, rivers, buildings, the amount of work increases sharply, and the construction cost is high;

[0006] b. The gravity drainage system can only allow sewage to flow from high to low. In order to ensure normal flow of sewage, a booster pump station needs to be set up to raise the water level, resulting in high operation and maintenance cost;

[0007] c. In order to prevent clogging, the inner diameter of the gravity flow pipe network must be greater than 30 cm. The sewage collection capacity is large, but for small areas with sewage discharge of 50 m 3 / d or less, the scale of construction is too high, and resources are wasted;

[0008] d. The traditional drainage pipe has a slow sewage flow rate, which is prone to problems such as clogging and blockage;

[0009] e: The drainage pipe is not tightly connected, and sewage leakage is serious, which reduces the sewage collection rate and seriously pollutes groundwater.

[0010] 2) Problems existing in the existing sewage treatment (traditional A 2 O process):

[0011] a. The traditional A 2 O treatment process requires many pump stations, such as a booster pump for the regulation tank to greatly raise the sewage elevation, a stirring device for the anaerobic tank, an aeration blower and a nitrification liquid return pump for the aerobic tower, and a sludge return pump for the secondary sedimentation tank. The use of these power equipment not only leads to high energy consumption of sewage treatment, but also requires regular maintenance or replacement of these equipment which are prone to damage, resulting in high labor and operation cost of sewage treatment. Therefore, it is generally suitable for large-scale sewage treatment plants, but it is very limited in small-scale sewage treatment plants, especially in mountainous areas with scattered households.

[0012] b. The capacity of the sewage pumps, aeration blowers, and sludge pumps supplied by the existing market is much higher than the actual demand of small area sewage treatment, for example, the flow rate of the sewage pumps provided by the market is more than 3 m 3 / h, the air volume of the aeration blower is more than 30 m 3 / h, and the sludge pump has a sludge discharge of more than 10 m 3 / h. However, the sewage discharge of most small areas is less than 50 m 3 / d, the required sewage pump flow rate of sewage treatment facilities is not more than 2 m 3 / h, the aeration volume is not more than 6 m 3 / h, and the sludge discharge is not more than 1 m 3 / h. Serious energy waste phenomenon.

[0013] c. Sewage pump belongs to the easily damaged equipment, the more the number of pumps used in the sewage station, the higher the construction cost, the higher the equipment failure frequency, and the more troublesome the artificial maintenance in the later period.

[0014] In summary, the existing small area sewage is mainly collected by gravity flow pipe network to the sewage station, and then treated by traditional A 2 O process before discharge, which has obvious defects such as large cost investment, high energy consumption and complex operation and maintenance. SUMMARY

[0015] In view of the above-mentioned deficiencies of the prior art, the purpose of the present application is to provide a decentralized source sewage collection-A 2 O process treatment linkage system and its treatment method, which solves the problems of large investment, high energy consumption and complex operation and maintenance in the prior art.

[0016] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0017] A decentralized source sewage collection-A 2 O treatment linkage system, characterized in that it comprises a sewage pretreatment and pipe network collection system, an A 2 O treatment system and a discharge system.

[0018] The sewage pretreatment and pipe network collection system comprises sewage collection pools distributed in small areas, and a negative pressure pipe network, the sewage collection pools are communicated with an anaerobic tank through the negative pressure pipe network, and a controller and a battery valve are arranged on the negative pressure pipe network.

[0019] The A 2 O treatment system comprises a sealed anaerobic tank, an aerobic tower and an anoxic tower, the water inlet of the anaerobic tank is communicated with the negative pressure pipe network, a water outlet pipe is arranged at the bottom of the anaerobic tank and communicated with the aerobic tower through a first pipeline, a self-priming pump and a Venturi jet are arranged on the first pipeline, a shunt pipeline is further arranged on the first pipeline, and an adjusting valve and a liquid flowmeter are arranged on the shunt pipeline; one end of the shunt pipeline is arranged on the first pipeline between the self-priming pump and the Venturi jet, and the other end is arranged at the top of the anoxic tower and communicated with the anoxic tower; the upper part and the lower part of the aerobic tower and the anoxic tower are respectively provided with a first circulating water pipe and a second circulating water pipe communicated with each other; a safety valve is arranged at the top of the anaerobic tank.

[0020] The discharge system comprises a discharge pipe, a filter screen and a sedimentation tank arranged on the aerobic tower; the sedimentation tank is further connected with a sludge drying and filtering tank through a pipeline; a sludge storage tank is further arranged at the bottom of the sludge drying and filtering tank; and the sludge storage tank is connected to the first pipeline at the front end of the self-priming pump through a third pipeline.

[0021] Further, the sewage collecting pool is a three-compartment sewage pool structure; wherein a coarse grid is vertically arranged in the first compartment, and a fine grid is vertically arranged in the third compartment; the coarse grid and the fine grid respectively divide the first compartment and the third compartment into two regions of water inlet area and water outlet area, so that impurities are blocked in front of the grid water outlet area.

[0022] Further, the sewage collecting pool is installed in different areas and shallowly buried with PE pipes; the pipe diameter of the PE pipe is 3-7 cm.

[0023] Further, the sludge drying and filtering pool is a square box type prefabricated structure, which is placed directly above the adjusting pool; the sludge drying and filtering pool is made of materials with different bearing capacities according to the size of the sewage treatment scale; the bottom plate of the sludge drying and filtering pool is fully perforated, the hole diameter is about 0.5 cm, the distance between the small holes is about 1 cm, polypropylene filter cloth is laid above the bottom plate, and the hole diameter of the filter cloth is between about 80 meshes and 300 meshes.

[0024] The application also provides a sewage collecting and discharging system for decentralized sewage sources. 2 The treatment method of the process treatment linkage system adopts the linkage system, and comprises the following steps:

[0025] 1) Sewage pretreatment and pipe network collection The sewage enters the sewage collecting pool, flows to the third compartment after fermentation and solid-liquid separation in the first two compartments, and is screened by the coarse grid in the first compartment and the fine grid in the third compartment in the sewage pool; according to the volume of the third compartment, the daily sewage inflow, and the design treatment capacity of the sewage treatment system, the liquid level height range of the sewage in the third compartment, i.e. the upper limit H 上 and the lower limit H 下 , is set by comprehensively considering various factors; the liquid level height data of the sewage in the sewage pool are sent to the power control switch by a liquid level meter; when the liquid level in the three-compartment pool is higher than H 上 , the power control switch opens the electromagnetic valve; when the liquid level in the three-compartment pool is lower than H 下 , the power control switch immediately closes the electromagnetic valve.

[0026] 2) Negative pressure suction and anaerobic treatment

[0027] When the self-priming pump is started, the sewage in the sealed anaerobic tank is pumped out, so that a negative pressure environment is formed in the anaerobic tank and the negative pressure pipe network; under the action of atmospheric pressure difference, the sewage in each sewage pool flows into the negative pressure pipe network and then flows into the negative pressure anaerobic tank, thereby driving the whole system; after the sewage enters the anaerobic tank, the anaerobic tank further mixes the sewage, fully utilizes the high-efficiency biological filler in the anaerobic tank as a microbial carrier, and decomposes macromolecular organic matter in the sewage into small-molecular organic matter with better biodegradability under the action of facultative bacteria and anaerobic bacteria, and the polyphosphorus bacteria release orthophosphate under anaerobic conditions and obtain energy.

[0028] 3) Aerobic-anoxic tower connected treatment system The sewage is divided by self-priming pump, part of which flows into the anoxic tower through the diversion pipeline, and the flow meter and regulating valve are arranged in the diversion pipeline to control the proportion of the sewage entering the anoxic tower and the aerobic tower. In the anoxic tower, part of the organic matter is used by denitrifying bacteria to promote denitrification and nitrogen removal. Another part of the sewage is transported into the aerobic tower after being aerated by the Venturi jet. In the aerobic tower, the sewage comes from two aspects, one is the sewage directly entering the aerobic tower after being aerated by the Venturi, and the other is the sewage flowing from the bottom of the anoxic tower into the bottom of the connecting pipe. The organic matter in the sewage is further removed by microorganisms, and the ammonia nitrogen is oxidized to nitrate, and the phosphorus accumulating bacteria absorb excess phosphorus under aerobic conditions to form phosphorus-rich sludge. The sludge-water mixture in the aerobic tower flows upward to the upper end of the aerobic tower under the action of air stripping, part of which returns to the anoxic tower for denitrification treatment, and the other part of the mixture flows into the sedimentation tank.

[0029] 4) Final treatment and discharge The sewage treated by the aerobic tower flows into the sedimentation tank, and the supernatant of the sedimentation tank meets the discharge requirements. The sludge in the sedimentation tank is discharged by gravity, part of which directly flows into the sludge storage tank, and the other part flows into the sludge drying and filtering tank for dewatering.

[0030] Further, a liquid level meter is arranged in the sludge storage tank, and a pipeline with an electromagnetic valve is connected to the pipeline before the self-priming pump. The upper limit H 上 and the lower limit H 下 of the sewage liquid level in the sludge storage tank are set according to the volume of the sludge storage tank, the total amount of sludge and water flowing in per day, and the design treatment capacity of the sewage treatment system. The liquid level meter sends the data of the sewage liquid level in the sludge storage tank to the power control switch. When the liquid level in the tank is higher than H 上 , the power control switch opens the electromagnetic valve, and the sludge-water mixture in the tank is pumped by the self-priming pump to the pipeline and transported into the aerobic tower and the anoxic tower for further treatment. When the liquid level in the tank is lower than H 下 , the power control switch immediately closes the electromagnetic valve.

[0031] Compared with the prior art, the present application has the following beneficial effects:

[0032] 1、The application creatively adopts special design of negative pressure collection technology, through using self-suction pump to suck anaerobic tank sewage, so that the sealed anaerobic tank forms a negative pressure environment, the anaerobic tank is connected with sewage collection pipe network, under the action of atmospheric pressure, the sewage of each discharge source is finally collected into the sealed anaerobic tank through the negative pressure collection pipe network. This way solves the problem of complex terrain in the sewage collection range, effectively avoids the problems of unstable flow and difficult water collection caused by terrain changes in the traditional collection system, improves the sewage collection efficiency; at the same time, PE pipe with a diameter of 3 to 7 cm is used, the buried depth is shallow, the construction difficulty is low, the construction cost and excavation amount are greatly reduced, and leakage is effectively reduced, which is not affected by the terrain.

[0033] In the aspect of sewage collection, the application uses a self-suction pump to create a negative pressure environment in the sealed anaerobic tank for negative pressure sewage collection. This negative pressure suction can reduce the dependence on external auxiliary equipment, reduce energy consumption, save manpower and time, and improve the efficiency of the sewage collection system. Further, by using negative pressure collection technology, the negative pressure pipe network collection system can overcome terrain obstacles and use pressure difference to suck sewage from each collection point to the treatment facility, ensuring efficient sewage collection. Even in areas with low terrain or high groundwater level, negative pressure pipe network collection can effectively avoid sewage backflow and overflow, ensuring stable operation of the collection system. In addition, only one self-suction pump is needed for the power equipment, and the process flow is clear and easy to understand. Regular maintenance and inspection of the equipment can ensure stable operation.

[0034] The application creatively applies air-lift technology, Venturi technology and siphon technology to the sewage process, and finally only one self-suction pump is needed to realize sewage collection and A 2 O process sludge backflow and oxygenation. The use of a self-suction pump to suck sewage in a sealed anaerobic tank forms a negative pressure environment in the anaerobic tank, allowing sewage to flow and reducing the use of various types of pumps and energy consumption. The Venturi jet device directly jets and aerates the sewage, reducing the dependence on high-energy mechanical aeration blowers and avoiding resource waste and material loss. At the same time, the water flow and dissolved oxygen distribution in the reaction tank are optimized, and the density difference between the gas-water mixture in the aerobic and anoxic towers of the special structure aerobic-anoxic connected tower forms air-lift force, allowing the sewage in the aerobic and anoxic towers to circulate without additional power, reducing energy consumption and promoting the denitrification and phosphorus removal process, significantly improving the treatment efficiency.

[0035] Wherein, a part of sewage is transported under the action of self-priming pump delivery thrust, passes through the Venturi jet device, and uses the Venturi device jet aeration to supply oxygen by itself, the part of sewage after aeration is self-flowing to the aerobic tower to ensure the smooth progress of nitrification reaction in the aerobic tower, another part of sewage is transported to the anoxic tower by the self-priming pump to provide sufficient substrate and carbon source for denitrifying bacteria in the anoxic tower, promote the progress of denitrification reaction, thereby improve the denitrification efficiency, and the above pain points can be better solved. In the sludge treatment mode, gravity flow is adopted, and the sludge in the sedimentation tank flows to the sludge storage tank by gravity, and then part of the sludge flows to the sludge drying and filtering tank for sludge and water separation.

[0036] 3、The present application avoids the energy waste of "big horse pulling small cart", reduces the pipe network material and pipe network construction construction amount through the specially designed sewage collection mode, greatly reduces the investment of construction engineering, and only needs a self-priming pump for power equipment, thereby reducing the cost and energy consumption; and can supply carbon and oxygen by itself, is really suitable for multiple scene small-scale sewage treatment, improves the environmental protection consciousness of residents, and promotes the development of sewage treatment industry. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 is the sewage collection of the present application dispersed emission source-A 2 The structure diagram of the process treatment linkage system.

[0038] Figure 2 is the three-grid sewage collection tank in the present application.

[0039] Figure 3 is the process diagram of the present application.

[0040] In the figure, 1 is a three-grid sewage tank, 2 is an anaerobic tank, 3 is an aerobic tower, 4 is an anoxic tower, 5 is a sedimentation tank, 6 is a sludge drying and filtering organization, 7 is a sludge storage tank, 8 is a controller, 9 is an electromagnetic valve, 10 is a safety valve, 11 is a self-priming pump, 12 is an electromagnetic valve, 13 is a Venturi jet device, 14 is a liquid flowmeter, 15 is a gas flowmeter, 16 is a sludge controller, 17 is a sludge backflow control valve, 18 is a sewage negative pressure collection pipe network, 19 is a shunt pipeline 1, 20 is a shunt pipeline 2, 21 is an anoxic tower sewage to aerobic tower gravity flow pipeline, 22 is an aerobic tower sewage to anoxic tower backflow pipeline, 23 is a treated sewage outflow pipeline, 24 is a treatment standard supernatant discharge pipeline, 25 is a sludge gravity flow pipeline, and 26 is a sludge backflow pipeline. DETAILED DESCRIPTION

[0041] The technical solutions of the present application will be described clearly and completely in connection with specific embodiments and drawings. Obviously, the embodiments are only representatives of the embodiments of the present application, and are not limited to the described embodiments. Therefore, the following detailed description of the embodiments provided in the drawings is not intended to limit the scope of the claimed application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of the present application.

[0042] It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. Among them, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the application is used, which is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood in specific circumstances.

[0043] One kind is a decentralized source sewage collection-A 2 O process treatment linkage system

[0044] As Figure 1 shown, the present application provides a decentralized source sewage collection-A 2 O treatment linkage system, comprising: a sewage pretreatment and pipe network collection system, an A 2 O treatment system and a discharge system; wherein the structure of each system is as follows:

[0045] 1.1 Sewage pretreatment and pipe network collection system: mainly includes a decentralized sewage collection tank 1 in a small area (there are many decentralized sewage discharge sources, generally the sewage discharged by each sewage discharge source flows into a corresponding sewage tank, and sewage tanks can be shared by nearby discharge sources), a sewage negative pressure collection pipe network 18, the sewage collection tank 1 is connected with an anaerobic tank 2 through the sewage negative pressure collection pipe network 18, and a controller 8 and a first battery valve 9 are arranged on the sewage negative pressure collection pipe network 18.

[0046] In this embodiment, the sewage collection tank 1 is a three-compartment sewage tank structure to form a fermentation zone and a solid-liquid separation zone, so as to avoid large particles from entering the negative pressure pipe and causing pipe network blockage, and to minimize the particles in the sewage flowing into the anaerobic tank 2. See Figure 2, two vertical partitions are arranged in the sewage collecting tank 1 to form three areas, and water pipes 1.1 are arranged between the areas for communication. A coarse grid 1.2 is vertically arranged in the first area, and a fine grid 1.3 is vertically arranged in the third area; the coarse grid 1.2 and the fine grid 1.3 respectively divide the first area and the third area into two areas, namely, a water inlet area and a water outlet area, so that impurities are blocked in front of the water outlet area of the grid. In the figure, 1.4 is a water inlet pipe, and 1.5 is a water outlet pipe.

[0047] 1.2 New A 2 O treatment system: including anaerobic tank 2, aerobic tower 3 and anoxic tower 4; the anaerobic tank 2 is kept sealed as much as possible, the water inlet thereof is communicated with the sewage negative pressure collecting pipe network 18, the bottom of the anaerobic tank 2 is provided with a first shunt pipeline 19 communicated with the aerobic tower 3, a self-priming pump 11 and a Venturi jet 13 are arranged on the first shunt pipeline 19, a branch, that is, a second shunt pipeline 20 is further arranged on the first shunt pipeline 19, an adjusting valve 12 and a liquid flow meter 14 are arranged on the second shunt pipeline 20; one end of the second shunt pipeline 20 is arranged on the first shunt pipeline 19 between the self-priming pump 11 and the Venturi jet 13, and the other end is arranged at the top of the anoxic tower 4 and communicated with the anoxic tower 4; the lower parts of the aerobic tower 3 and the anoxic tower 4 are provided with an anoxic tower sewage to aerobic tower self-flow pipeline 21, and the upper parts of the aerobic tower 3 and the anoxic tower 4 are provided with an aerobic tower sewage to anoxic tower reflux pipeline 22. A safety valve 10 is arranged at the top of the anaerobic tank 2, when the gas pressure in the anaerobic tank exceeds the set upper limit value, the safety valve is automatically opened to discharge part of the fermentation gas. Biological fillers are arranged in the anaerobic tank 3, the aerobic tower 6 and the anoxic tower 7 to provide carriers for the growth and reproduction of microorganisms.

[0048] 1.3 Discharge system: including a water outlet pipe 23 arranged on the aerobic tower 3 (a pipe for discharging sewage after being treated by the aerobic tower), and a supernatant discharge pipeline 24 of the sedimentation tank, a sludge gravity flow discharge pipeline 25 and a sludge reflux pipeline 26; the discharge pipeline 23 is connected with the sedimentation tank 5, the sludge gravity flow pipeline 25 is sequentially connected with the sludge drying and filtering tank 6 and the sludge storage tank 7. The sludge storage tank 7 is connected with the first shunt pipeline 19 through the sludge reflux pipeline 26 and is arranged at the front end of the self-priming pump 9. In the present application, the sludge drying and filtering tank 6 is designed according to the characteristics of small sewage treatment area and small sludge discharge amount, and is in the form of a square box type prefabricated structure and is placed directly above the sludge storage tank 7. Different bearing materials are selected according to the size of the sewage treatment scale, the bottom plate of the sludge drying and filtering tank 6 is fully perforated, the hole diameter is about 0.5 cm, the hole spacing is about 1 cm, polypropylene filter cloth (or other filter cloth with good corrosion resistance, acid and alkali resistance, wear resistance, stability, high temperature resistance and air permeability) is laid above the bottom plate, the hole diameter of the filter cloth is between 80 meshes and 300 meshes, and the specific hole diameter is determined according to the characteristics of the sludge

[0049] Secondly, the sewage collecting and discharging system of the present application is used for 2The process flow of the process treatment linkage system includes:

[0050] 2.1 Sewage pretreatment and collection: The sewage from each dispersed discharge source within the sewage collection range flows to the three-compartment sewage tank by itself. In the first two compartments of the sewage tank, anaerobic fermentation, solid-liquid separation, and coarse and fine two-stage grid filtration are performed. The sewage finally flows to the third compartment. When the sewage in the third compartment reaches the upper limit of the specified height, the liquid level meter feeds back the sewage height to the controller, which starts the electromagnetic valve on the outlet pipe to open, so that the pretreated sewage in the three-compartment tank flows through the outlet pipe and the negative pressure collection pipe to the closed anaerobic tank. In this process, when the self-priming pump pumps the sewage in the anaerobic tank to form a negative pressure in the anaerobic tank and the collection pipe network, the sewage flows from the three-compartment sewage tank into the negative pressure pipe network under the action of atmospheric pressure, and finally flows into the anaerobic tank under negative pressure to enter the next treatment program. This avoids the construction of a booster pump during the sewage collection process.

[0051] 2.2 New A 2 O process: After the sewage is treated by the anaerobic tank, it is pumped out by the self-priming pump to the next treatment system at regular intervals. After being pumped out by the self-priming pump, the sewage is divided into two parts. One part flows into the anoxic tower to provide carbon source for the denitrification of microorganisms in the tower, and the other part flows into the aerobic tower through a Venturi. The aerobic and nitrification reactions occur in the tower. When the sewage passes through the Venturi, air is sucked into the throat of the Venturi, forming a gas-water mixture with the sewage, which is finally transported to the aerobic tower. In this way, the sewage is transported from the anaerobic tank to the aerobic tower, and the purpose of jet aeration and oxygenation of the sewage is achieved.

[0052] The application designs a special structure of the aerobic tower and the anoxic tower, in the aerobic tower, the gas-water mixture liquid has the upward movement power under the gas stripping buoyancy of the Venturi, and the density of the gas-water mixture liquid in the aerobic tower is less than the density of the sewage in the anoxic tower, so that the liquid pressure in the aerobic tower is less than the liquid pressure in the anoxic tower, the sewage in the anoxic tower flows to the aerobic tower through the connecting pipe at the bottom, and further pushes the gas-water mixture liquid in the aerobic tower to move upward (this process is also called the gas stripping effect), the gas-water mixture liquid in the aerobic tower flows to the top of the aerobic tower under the gas stripping effect (at this time, most of the air in the sewage has been released and escaped from the sewage, and the density is close to the sewage), part of the sewage flows back into the anoxic tower to occur the denitrification through the connecting pipe, the valve is arranged in the connecting pipe to control the backflow (backflow ratio), the sewage flowing back to the anoxic tower then flows downward to the bottom in the anoxic tower and then flows into the aerobic tower through the connecting pipe at the bottom, so that the nitrification liquid backflow circulation in the aerobic tower is completed, another part of the sewage in the aerobic tower flows into the sedimentation tank through the top of the tower, the mud-water separation is carried out, the supernatant of the sedimentation tank reaches the requirement and is discharged, the sludge in the sedimentation tank flows to the storage tank by gravity, part of the sludge directly flows into the storage tank, and the other part of the sludge flows to the special designed sludge drying and filtering tank to be dewatered, the water in the sludge seeps into the storage tank through the filter membrane at the bottom of the sludge drying and filtering tank, and the sludge is intercepted in the sludge drying and filtering tank. The pipeline is arranged to connect the storage tank and the water inlet pipe of the self-priming pump, the sludge in the storage tank is sucked into the pipeline by the self-priming pump, and finally flows back to the aerobic tower and the anoxic tower to be treated again.

[0053] 2.3 Sewage discharge and treatment The sewage treated by the aerobic tower flows to the sedimentation tank, the supernatant of the upper part of the sedimentation tank reaches the requirement and is discharged, the sludge in the sedimentation tank is discharged by gravity, part of the sludge directly flows into the storage tank (to be treated again by the aerobic tower and the anoxic tower by the self-priming pump), and the other part of the sludge flows to the sludge drying and filtering tank to be dewatered.

[0054] In summary, the application only needs to use one self-priming pump power facility, and is used in cooperation with the anaerobic tank, the Venturi jet device and the special structure of the aerobic tower and the anoxic tower, to form a new type of A 2 O sewage treatment technology, which can realize the lifting, aeration, sludge backflow, digestion liquid backflow and sludge discharge of the sewage, so that the traditional A 2The use of high-energy-consuming and easily damaged power equipment such as aeration blowers, sewage lift pumps, sludge return pumps, and nitrification liquid return pumps in O technology not only saves energy but also effectively treats various pollutants in sewage, producing stable effluent quality that meets national or local discharge standards. It improves the surrounding environment and reduces sewage treatment costs while ensuring water quality compliance, and is characterized by high efficiency and energy saving. It is suitable for areas with complex terrain such as mountainous and hilly areas (where the cost and construction difficulty of gravity flow pipe networks increase sharply), as well as suburban residential areas, schools, markets, and rural areas without municipal sewage pipe networks, including concentrated villages, communities, markets, resorts, tourist attractions, farmhouses, factories, and small-scale towns with a population of less than 2000, for the collection and treatment of sewage (similar to domestic sewage).

[0055] III. Wastewater Collection from Decentralized Emission Sources in This Invention - A 2 O-process linkage system processing method

[0056] See Figure 3 As shown, its processing flow and methods include the following steps:

[0057] 3.1 Wastewater Pretreatment and Pipeline Collection: In small areas where wastewater discharge sources are dispersed, each discharge source is equipped with a three-compartment wastewater treatment tank for advanced pretreatment. Wastewater undergoes fermentation and solid-liquid separation in the first two compartments before flowing into the third compartment. Larger suspended solids are removed by passing through the coarse screen in the first compartment and the fine screen in the third compartment. A level gauge and an outlet pipe with a solenoid valve are installed in the third compartment. The upper limit H of the wastewater level in the third compartment is set based on a comprehensive consideration of factors such as the volume of the third compartment, the daily wastewater inflow, and the design capacity of the wastewater treatment system. 上 and lower limit H 下 The level gauge sends the sewage level data in the sewage tank to the power control switch. When the level in the three-compartment tank is higher than H... 上 When the power control switch opens the solenoid valve; when the liquid level in the three-compartment tank is lower than H... 下 When this happens, the power control switch immediately closes the solenoid valve.

[0058] Negative pressure suction and anaerobic treatment

[0059] When the self-priming pump is started, the sewage in the anaerobic tank is pumped out, forming a negative pressure environment in the upper part of the anaerobic tank and the negative pressure pipe network. Under the action of atmospheric pressure difference, the sewage in each sewage pool flows into the negative pressure collection pipe network, and then into the negative pressure anaerobic tank, driving the entire system. In this process, by reasonably setting the running time of the self-priming pump through the automatic controller, the self-priming pump not only plays a key role in pumping sewage to create negative pressure, but also achieves the purpose of adjusting the running time, so that the sewage in each three-grid pool is collected into the anaerobic tank according to the set time (to ensure that the sewage in the sewage pool does not overflow), and the sewage in the anaerobic tank is reasonably and evenly transported to the aerobic tower and the anoxic tower. According to the discharge capacity and system processing capacity, the running time is reasonably and evenly set, and the sewage flow in the entire system is powered.

[0060] After the sewage enters the anaerobic tank, the anaerobic tank further mixes the sewage, fully utilizes the high-efficiency biological filler in the anaerobic tank as a microbial carrier, and under the action of facultative bacteria and anaerobic bacteria, decomposes macromolecular organic matter in the sewage into small-molecule organic matter with better biodegradability through anaerobic fermentation. The polyphosphorus bacteria release orthophosphate under anaerobic conditions and obtain energy. Due to the release of orthophosphate by polyphosphorus bacteria, the concentration of phosphorus in the sewage increases, and the organic matter in the sewage is decomposed and absorbed by microorganisms, which is beneficial to further oxidation and decomposition in the subsequent biological treatment tank. A safety valve is provided at the top of the anaerobic tank. When the fermentation gas in the anaerobic tank is too much, causing the gas pressure in the anaerobic tank to exceed the set upper limit value, and there is a safety risk, the safety valve automatically opens and discharges part of the fermentation gas.

[0061] Another part of the sewage is transported to the aerobic tower after aeration by the Venturi jet. Here, the Venturi mainly plays a role in jet aeration, thereby avoiding the use of high-energy consumption equipment, an aeration blower, and also plays a key role in aeration and oxygenation of the aerobic tower and upward flow of the sewage. In addition, a gas flow meter is arranged at the inlet pipe of the Venturi, and the aeration amount is adjusted in real time. In the aerobic tower, the sewage comes from two aspects, one part is the sewage directly entering the aerobic tower after aeration and oxygenation by the Venturi, and the other part is the sewage from the bottom of the sewage in the anoxic tower flowing into the bottom of the connecting pipe. The organic matter in the sewage in the aerobic tower is further removed by microorganisms, ammonia nitrogen is oxidized to nitrate, and phosphorus accumulating organisms (PAOs) under aerobic conditions absorb excess phosphates to synthesize polyphosphates and store them in cells to form phosphorus-containing sludge. BOD5 in the sewage in the aerobic tower is further reduced, and the concentration of phosphate in the sewage is greatly reduced due to the excessive uptake of PAOs. Subsequently, the sludge-water mixture in the aerobic tower flows upward under the action of air stripping, part of which is returned to the anoxic tower for denitrification treatment, and the rest of the mixture flows into the sedimentation tank.

[0062] Features of this stage: part of the sewage in the anaerobic tank is directly transported to the anoxic tower by the self-priming pump, and the organic matter in the sewage is used as a carbon source for denitrification of the denitrifying bacteria in the anoxic tower; the biological denitrification of the anoxic tower consumes part of the organic matter, reducing the organic load of the aerobic tower; the alkalinity produced by the denitrification reaction of the sewage in the anoxic tower can also supplement the alkalinity for the nitrification reaction in the aerobic tower. In the aerobic tower, the aerobic microorganisms further decompose the residual organic matter in the sewage, improving the water quality of the effluent. The lower and upper parts of the aerobic tower are reasonably arranged with connecting pipes to connect the two, and under the action of air stripping, the circulation and reflux between the sewage in the aerobic tower and the anoxic tower can be realized, thereby improving the efficiency of denitrification and nitrogen removal. 3.4 Final treatment and discharge The sewage treated by the aerobic tower flows to the sedimentation tank, the supernatant of the sedimentation tank meets the requirements and is discharged, and the sludge in the sedimentation tank is discharged by gravity and is divided into two parts, one part directly flows into the sludge storage tank (to be pumped to the aerobic-anoxic tower for treatment by the self-priming pump), and the other part flows to the sludge drying and filtering tank for dewatering.

[0063] The sludge discharged into the sludge dewatering filter tank has most of the water in the sludge infiltrate through the filter cloth under the action of gravity and flow into the sludge storage tank, and the sludge matrix retained in the dewatering filter tank is further evaporated and dewatered under the action of natural weathering. The volume of the sludge dewatering filter tank at least meets the sludge storage requirement of the sedimentation tank for half a month, and the size of the sludge dewatering filter tank is designed according to the size of the sludge storage tank and needs to meet the requirements that it can be placed directly above the sludge storage tank and the infiltrated sewage can all flow into the sludge storage tank. A rainproof roof is arranged above the sludge dewatering filter tank, and the distance between the roof and the filter tank needs to meet the requirements of smooth ventilation and rainproof. As the amount of sludge accumulated in the sludge dewatering filter tank increases, regular manual cleaning (about once every two weeks) is needed, and the filter cloth and the bottom plate at the bottom need to be flushed to prevent clogging. The sludge discharged from the sedimentation tank flows into the sludge storage tank directly, and the other part of the sludge is discharged into the sludge dewatering filter tank for dewatering. The water in the sludge infiltrates through the filter cloth and flows into the sludge storage tank. A liquid level meter is arranged in the sludge storage tank, and a pipeline with a solenoid valve is connected to the pipeline before the self-priming pump. The liquid level height range, i.e., the upper limit H 上 and the lower limit H 下 , in the sludge storage tank is set by comprehensively considering the volume of the sludge storage tank, the total amount of sludge water collected per day, and the design treatment capacity of the sewage treatment system. The liquid level meter sends the data of the liquid level height of the sewage in the sludge storage tank to the power control switch. When the liquid level in the tank is higher than H 上 , the power control switch opens the solenoid valve, and the sludge water mixture in the tank is pumped by the self-priming pump into the pipeline and transported into the aerobic tower and the anoxic tower for further treatment. When the liquid level in the tank is lower than H 下 , the power control switch immediately closes the solenoid valve.

[0064] The model of the self-priming pump is reasonably selected to make its flow meet the sewage collection and treatment requirements and its suction stroke meet the elevation requirements, so that the sewage in the sludge storage tank and the sewage in the anaerobic tank can be sucked into the self-priming pump.

[0065] Four, compared with the traditional technology, the present application achieves unexpected technical effects in operation energy consumption, construction cost, operation and maintenance cost, and energy recovery. Mainly including:

[0066] 4.1 Operation energy consumption: the traditional A 2 O system usually has a large energy consumption percentage due to the dependence on aeration fan, sludge return pump, digested liquid return pump, and sewage lifting pump equipment. Compared with the traditional system, the present application optimizes the aeration and circulation mode, especially by adding a Venturi, which reduces the energy consumption per cubic meter of sewage treatment by 40%-50% compared with the traditional system.

[0067] Cost of consumables and construction: Traditional gravity flow sewer network requires large-scale infrastructure construction (such as concrete structure, steel equipment, etc.), resulting in high construction cost. In contrast, the system of the present application adopts modular design, and the equipment is more simple, especially the negative pressure collection pipe only needs about 3 to 7 cm of PE pipe, which can meet the sewage collection requirements, reducing the consumption of manpower and material resources for pipe network construction.

[0068] Operation and maintenance cost: Traditional A 2 O system uses a large number of various pumps, and the operation and maintenance relies on manual and equipment repair, and the equipment structure is complex, so the failure rate is high, resulting in high maintenance cost. Usually, 10%-15% of the annual facility construction cost is paid as maintenance fee. Compared with the traditional system, the system of the present application only needs one self-priming pump power equipment to meet the entire power demand of the sewage station, greatly reducing the energy consumption and operation and maintenance cost. The maintenance cost of the new system is 45%-60% lower than that of the traditional system, and because the equipment is more reliable, the failure rate is lower, so the operation cycle of the system is longer.

[0069] Scope of application:

[0070] (1) Collection and treatment of sewage after each scattered source of sewage in areas with large terrain undulations such as mountainous or hilly areas;

[0071] (2) Rural residential areas: especially the collection and treatment of domestic sewage or similar domestic sewage in rural areas without sewage collection sewer network, such as rural villages, concentrated villages, communities and marketplaces;

[0072] (3) Rural resorts and hotels: tourist attractions, resorts and small and medium-sized hotels located in rural areas, which need to ensure that the environment is not polluted and meet the requirements of tourism environmental protection;

[0073] (4) Enterprises and factories: domestic sewage and low-concentration organic production wastewater generated by enterprises and factories;

[0074] (5) Agriculture and breeding: suitable for livestock and poultry breeding wastewater treatment, as well as sewage treatment and recycling in farms and orchards;

[0075] (6) Urban suburbs or small towns: collection and treatment of domestic sewage in urban and suburban residential areas or small towns without municipal sewage pipe network.

[0076] Five, technical explanation of popularization prospect

[0077] 5.1 High-efficiency treatment: Through the screening of coarse and fine grids, as well as the synergistic treatment of anaerobic tanks, aerobic towers, and anoxic towers, suspended solids, organic matter, and nutrients such as nitrogen and phosphorus in wastewater can be effectively removed, ensuring that the effluent quality meets the standards. 5.2 Energy saving and emission reduction: This process uses self-priming pumps to create a negative pressure environment, which reduces the energy consumption of traditional wastewater treatment processes. 5.3 Intelligent management: With the development of Internet of Things and artificial intelligence technology, this process can incorporate more intelligent elements. For example, by installing sensors to monitor water quality, water quantity, and other key parameters in real time, using big data analysis and artificial intelligence algorithms to accurately predict and optimize the control of the wastewater treatment process, and improving the treatment efficiency. 5.4 Flexible adaptation: The anoxic-aerobic connected tower used in this process can be flexibly adjusted according to actual water quality and treatment needs. At the same time, for the differences in wastewater production and composition in different regions, centralized installation of storage tanks and adjustment of the treatment process can also be used to adapt to the situation. 5.5 Resource recycling: After treatment, the wastewater can meet the discharge standards and even be directly used for agricultural irrigation, industrial cooling, and other purposes, realizing the recycling of water resources. In addition, the nutrients such as nitrogen and phosphorus recovered from wastewater can also be used to make fertilizers, further improving the efficiency of resource utilization.

[0078] 5.6 Especially suitable for mountainous and hilly terrain areas, the gravity flow pipe network is laid in mountainous and hilly terrain applications, which requires a huge amount of construction. The negative pressure pipe network wastewater pipe network of the present application is laid along the surface uphill or downhill, is not affected by the terrain, has a shallow burial depth, and has low construction difficulty. The collection pipe network only needs about 3 to 7 cm of PE pipe, which significantly reduces the pipe network material consumption and cost, and has obvious advantages.

[0079] According to the preliminary experimental results and the comparison of existing wastewater collection and treatment technologies, the construction cost of the wastewater collection pipe network of the present application can be reduced by more than 50%, the construction cost of the wastewater treatment facility can be reduced by more than 20%, the treatment energy consumption can be reduced by more than 35%, and the effluent quality can reach the first B standard of the "Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants" (GB 18918-2002). In addition to the above short-term economic benefits, this project can also drive many aspects of economic benefits, such as saving water resources, reducing water treatment costs, improving resource recovery rate, and reducing infrastructure investment, etc.

[0080] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing examples, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A decentralized emissions source sewage collection-A 2 O treatment linkage system characterized by, including sewage pretreatment and collection system, A 2 O treatment system and discharge system; The sewage pretreatment and pipe network collecting system comprises sewage collecting tanks and negative pressure pipe networks which are distributed in a small area, the sewage collecting tanks are communicated with sealed anaerobic tanks through the negative pressure pipe networks, and controllers and electromagnetic valves are arranged on the negative pressure pipe networks; The A 2 O treatment system: including sealed anaerobic tank, aerobic tower and anoxic tower; the water inlet of the anaerobic tank is communicated with negative pressure pipe network, the bottom of anaerobic tank is equipped with water outlet pipe and is communicated with aerobic anoxic connected tower through first pipeline, the first pipeline is equipped with self-priming pump and venturi jet, first pipeline is also equipped with shunt pipeline, the shunt pipeline is equipped with flow regulating valve and liquid flowmeter; one end of the shunt pipeline is arranged on the first pipeline between self-priming pump and venturi jet, the other end is arranged on the top of anoxic tower and is communicated with anoxic tower; the upper part and the lower part of aerobic tower and anoxic tower are respectively equipped with communicated first circulating water pipe and second circulating water pipe, so that the upper end and the lower end of aerobic tower and anoxic tower are connected, so that the sewage in the two towers can be circulated; the top of anaerobic tank is provided with safety valve, when the gas pressure in the tank exceeds the safety setting limit, the safety valve is automatically opened to release part of gas; The discharge system comprises a discharge pipe, a filter screen and a sedimentation tank which are arranged on the aerobic tower; the sedimentation tank is also connected with a sludge drying and filtering tank through a pipeline; a sludge storage tank is further arranged at the bottom of the sludge drying and filtering tank; the sludge storage tank is connected with the first pipeline at the front end of the self-priming pump through a third pipeline; after the sewage is output by the self-priming pump, the sewage is branched, part of the sewage flows into the anoxic tower through a branch pipeline, and a flowmeter and an adjusting valve are arranged in the branch pipeline to control the proportion of the sewage branched into the anoxic tower and the aerobic tower; Another part of the branched sewage is transported into the aerobic tower after being aerated by a Venturi jet; the sludge-water mixture in the aerobic tower flows upwards under the gas stripping effect, part of the mixture is circulated back to the anoxic tower for denitrification treatment, and another part of the mixture flows into the sedimentation tank from the upper part of the aerobic tower.

2. The decentralized source wastewater collection system of claim 1, wherein: 2 A processing system characterized by: The sewage collecting tank is a three-compartment sewage tank structure; a coarse grid is vertically arranged in the first compartment, and a fine grid is vertically arranged in the third compartment; the coarse grid and the fine grid respectively divide the first compartment and the third compartment into two regions, i.e., a water inlet region and a water outlet region, so that impurities are blocked in front of the water outlet region of the grid.

3. The decentralized source wastewater collection system of claim 1, wherein the wastewater collection system is a decentralized source wastewater collection- A 2 A processing system characterized by: The sewage collecting tanks are installed in different areas and shallowly bury PE pipes; the diameter of the PE pipes is 3-7 cm.

4. The decentralized source wastewater collection system of claim 1, wherein the wastewater collection system is a decentralized source wastewater collection- A 2 A processing system characterized by: The sludge drying and filtering tank is a prefabricated square frame structure which is placed directly above the sludge storage tank; the sludge drying and filtering tank is made of materials with different bearing capacities according to the size of the sewage treatment scale; the bottom plate of the sludge drying and filtering tank is fully perforated, the hole diameter is 0.5 cm, and the distance between the small holes is 1 cm; polypropylene filter cloth is laid above the bottom plate, the hole diameter of the filter cloth is between 80 meshes and 300 meshes, and the specific hole diameter is determined according to the characteristics of the sludge.

5. A decentralized source wastewater collection-A 2 A method of treating a process handling linkage system, characterized by: The treatment method of the linkage system of claim 1, 2, 3 or 4 comprises the following steps: 1) sewage pretreatment and pipe network collection Each sewage discharge source sewage flows into the sewage collection tank, first in the first two fermentation and solid-liquid separation after the flow to the third, and through the outlet pipe and negative pressure pipe network connection; through the sewage in the sewage collection tank after the first coarse grid and the third grid of fine grid filter screen off larger suspended solids; according to the volume of the third grid, daily sewage inflow and sewage treatment system design capacity factors, comprehensive consideration set third pool in sewage level height range, namely the upper limit H 上 And the lower limit H 下 , liquid level meter sewage pool in sewage level height data sent to the power control switch, when the three grid pool liquid level is higher than H 上 , power control switch opens the electromagnetic valve; when the three grid pool liquid level is lower than H 下 , power control switch immediately closes the electromagnetic valve; 2) negative pressure suction and anaerobic treatment When the self-priming pump is started, the sewage in the sealed anaerobic tank is pumped out, a negative pressure environment is formed in the upper part of the anaerobic tank and the sewage collecting pipe network, under the action of atmospheric pressure difference, the sewage in each sewage tank flows into the negative pressure pipe network and then flows into the negative pressure anaerobic tank, thus driving the whole system; after the sewage enters the anaerobic tank, the anaerobic tank further mixes the sewage, fully utilizes the high-efficiency biological filler in the anaerobic tank as a microbial carrier, under the action of facultative bacteria and anaerobic bacteria, decomposes macromolecular organic matter in the sewage into small-molecular organic matter with better biodegradability through anaerobic fermentation, and polyphosphorus bacteria release orthophosphate under anaerobic conditions and obtain energy; 3) aerobic-anoxic tower connected treatment system The sewage is output by the self-suction pump and then is divided into two streams, one of which flows into the anoxic tower through the shunt pipeline. A flow meter and a regulating valve are arranged in the shunt pipeline to regulate the proportion of the sewage flowing into the anoxic tower and the aerobic tower. In the anoxic tower, part of the organic matters are used by the denitrifying bacteria to promote the denitrification and nitrogen removal. The other part of the sewage is sent into the aerobic tower after being aerated by the Venturi jet aerator. The sewage in the aerobic tower comes from two sources, one is the sewage directly entering the aerobic tower after being aerated by the Venturi jet aerator, and the other is the sewage from the bottom of the anoxic tower flowing into the bottom of the aerobic tower through the self-flowing connecting pipe. The organic matters in the sewage in the aerobic tower are further removed by the microorganisms, and the ammonia nitrogen is oxidized into nitrate nitrogen. Meanwhile, the phosphorus accumulating organisms absorb the excessive phosphates to synthesize the polyphosphates under the aerobic condition, and store the polyphosphates in the cells to form the phosphorus-rich sludge. Then, the sludge-water mixture in the aerobic tower flows upward under the gas stripping action, part of which is circulated back to the anoxic tower for denitrification treatment, and the other part of which flows into the sedimentation tank from the upper part of the aerobic tower. 4) Final treatment and discharge The sewage treated by the aerobic tower flows into the sedimentation tank, and the supernatant of the sedimentation tank reaches the treatment requirement and is discharged. The sludge of the sedimentation tank flows into the sludge storage tank directly, and the other part of the sludge flows into the sludge drying and filtering tank for dewatering. The water in the sewage infiltrates through the filter screen and flows into the sludge storage tank. The dewatered sludge is regularly cleaned.

6. The distributed emission source wastewater collection system of claim 5, wherein the plurality of wastewater collection vessels are configured to be distributed across a plurality of locations. 2 A method of processing a process treatment linkage system, the method comprising: A level gauge is installed in the sludge storage tank, and a pipe equipped with a solenoid valve is connected to the pipe before the self-priming pump. The upper limit H of the sewage level in the sludge storage tank is set based on a comprehensive consideration of the tank's volume, the total daily sludge volume, and the design capacity of the wastewater treatment system. 上 and lower limit H 下 The level gauge sends the sewage level data in the sludge storage tank to the power control switch. When the liquid level in the tank is higher than H... 上 When the power control switch opens the solenoid valve, the mud-water mixture in the tank is pumped into the pipeline by the self-priming pump and transported to the aerobic and anoxic towers for further treatment; when the liquid level in the tank is lower than H... 下 When this happens, the power control switch immediately closes the solenoid valve.

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