Integrated sewage treatment equipment and method

Abstract

The invention discloses integrated sewage treatment equipment and an integrated sewage treatment method, relates to the technical field of sewage treatment, and solves the problem that integrated sewage treatment equipment capable of efficiently treating high-concentration suspended solids and grease sewage with high automation degree and less manual intervention is lacked in the prior art. The sewage treatment device comprises a sewage collection tank, a liquid outlet pipeline of the sewage collection tank is connected with a first sedimentation tank, a liquid outlet pipeline of the first sedimentation tank is connected with an air flotation assembly, a liquid outlet pipeline of the air flotation assembly is connected with a second sedimentation tank, and a liquid outlet pipeline of the second sedimentation tank is connected with a biochemical assembly; a lifting pump is mounted on each pipeline; the invention aims to realize the functions of oil removal, surfactant removal, nitrogen removal, phosphorus removal and the like, adopts modern technical means, realizes automatic control and management, improves the automation level, reduces the operation cost, reduces the daily maintenance and overhaul workload, improves the operation conditions of workers, and achieves reliable technology, economy and reasonableness, and can realize the functions of oil removal, surfactant removal, nitrogen removal, phosphorus removal and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and in particular relates to an integrated sewage treatment device and method. Background Art

[0002] With the rapid development of industrialization and urbanization, the demand for sewage treatment is growing. Since sewage contains high concentrations of suspended solids, ammonia nitrogen, oil, etc., if it is directly discharged without effective treatment, it will seriously affect the surrounding water environment. According to the national environmental protection law and the requirements of local environmental protection departments, sewage treatment is required, and it is reused or used to irrigate vegetation after treatment. Therefore, the requirements for sewage treatment efficiency and effect are getting higher and higher. Traditional sewage treatment technology often has problems such as large footprint, high energy consumption, and complex operation. In order to solve these problems, integrated sewage treatment equipment came into being. It combines multiple treatment units compactly through integrated design to achieve efficient sewage treatment.

[0003] However, the existing technical equipment is not efficient in removing grease and suspended solids. In order to remove grease and suspended solids, a large amount of chemicals are often added, resulting in high environmental pollution and high costs. Currently, there is a lack of integrated sewage treatment equipment that can efficiently treat high-concentration suspended solids and grease wastewater with a high degree of automation and less human intervention. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an integrated sewage treatment equipment and method, which has high treatment efficiency and stable effluent, and can achieve functions such as oil removal, surfactant removal, nitrogen removal, and phosphorus removal. It adopts modern technical means to achieve automatic control and management, improve the level of automation, reduce operating costs, reduce the workload of daily maintenance and repair, improve workers' operating conditions, and achieve technical reliability and economic rationality.

[0005] The technical solution adopted by the present invention is as follows:

[0006] An integrated sewage treatment device comprises a sewage collecting tank, wherein the liquid outlet pipe of the sewage collecting tank is connected to a first sedimentation tank, the liquid outlet pipe of the first sedimentation tank is connected to an air flotation component, the liquid outlet pipe of the air flotation component is connected to a second sedimentation tank, and the liquid outlet pipe of the second sedimentation tank is connected to a biochemical component; a lifting pump is installed on each pipe.

[0007] By adopting the above technical scheme, the sewage collection tank is used to collect the accumulated water transported from the sludge tank in the cleaning room; the first sedimentation tank can collect sewage and has the primary pollution removal function at the same time, which is used to adjust the water volume, homogenize the water quality, and improve the impact resistance of the entire treatment system; the flotation component is used to remove suspended impurities with a density close to that of water and difficult to settle or float naturally. It produces a large number of tiny bubbles in the water, so that the pollutants such as emulsified oil and tiny suspended particles in the wastewater adhere to the bubbles and float to the water surface with the bubbles to form foam, thereby achieving the purpose of separating impurities and purifying wastewater; the second sedimentation tank is used to collect sewage treated by the flotation component; the biochemical component adopts biological fillers to convert large molecular organic matter into small molecular organic matter, further oxidize and decompose, and thoroughly purify the sewage to finally obtain clean water that meets the standards; the lifting pump can extract water from each mechanism, which is convenient for the transportation of sewage between various mechanisms.

[0008] Preferably, the liquid inlet pipeline of the sewage collection tank is connected to a first dosing device, and the liquid inlet pipeline of the air flotation component is connected to a second dosing device.

[0009] By adopting the above technical solution, the first dosing device regularly and quantitatively injects medicine into the sewage collection tank to flocculate the sewage; the second dosing device adds medicine into the flotation component to improve the removal rate of impurity sludge in the flotation component.

[0010] Preferably, the air flotation assembly comprises a box body, a scraping system is arranged on the box body, a release assembly is arranged on the inner wall of the box body, and a dissolved air system is arranged outside the box body, and the dissolved air system is connected to a pipeline of the release assembly.

[0011] By adopting the above technical solution, air is dissolved in a pressure tank and mixed with water to form saturated dissolved air water. This process is carried out in the dissolved air system, in which air is dissolved in water under high pressure, and the saturated dissolved air water enters the box through the release component. The design of the release component allows the air dissolved in the water to form tiny bubbles under reduced pressure. When the dissolved air water passes through the release component, the pressure reduction causes the dissolved air to quickly form a large number of tiny bubbles. These tiny bubbles have a large surface area and can contact with pollutants in the water (such as grease, suspended solids, colloidal particles, etc.). Due to the surface tension between the bubbles and the pollutants, During the flotation process, pollutants will adhere to the surface of the bubbles. Due to the decrease in overall density, the buoyancy of the bubbles attached with pollutants increases, and they begin to float to the water surface. As the bubbles float up, the attached pollutants gradually gather on the water surface to form a scum layer, which is removed from the water surface by a scraping system, thereby removing the pollutants. The release component is crucial to the flotation effect. It needs to be able to generate enough tiny bubbles, and these bubbles need to have good stability so that they can carry pollutants during the flotation process. In addition, the layout and distribution of the release component will also affect the uniformity of the bubble distribution, thereby affecting the decontamination efficiency of the entire flotation process.

[0012] Preferably, the release assembly includes a plurality of diffusion plates, and the plurality of diffusion plates are evenly distributed on the bottom wall and the side walls of the box body, and the gas dissolving system is connected to the plurality of diffusion plates through pipelines.

[0013] By adopting the above technical solution, the diffuser plate distributes the bubbles evenly to various areas of the flotation tank through the small holes or gaps designed therein, ensuring that an effective flotation process can be carried out in the entire tank. The evenly distributed bubbles can increase the contact opportunities with pollutants and improve the attachment rate of pollutants and bubbles, thereby improving the removal efficiency of flotation. If the bubbles are concentrated in a certain area, it may cause local oversaturation and affect the flotation effect. The diffuser plate can avoid this situation and ensure that the bubbles are evenly distributed in the entire flotation tank. By evenly distributing the bubbles, the need for excessive increase in air flow to achieve the desired flotation effect can be reduced, thereby reducing energy consumption. The diffuser plate helps to avoid dead zones or flow dead corners in the flotation tank, which may reduce the flotation efficiency. The evenly distributed bubbles can reduce equipment wear or blockage caused by excessive bubbles in local areas, reducing maintenance requirements and costs. The even distribution of multiple diffusers enables the operator to adjust the release amount and distribution of bubbles according to actual conditions, thereby improving the flexibility of operation.

[0014] Preferably, the scraping system includes a connecting pipe and two slide rails, the slide rails are respectively arranged on the two inner side walls of the box body, and the two ends of the connecting pipe are respectively connected to the slide rails through two sliding blocks; a scraper is arranged at the lower part of the connecting pipe.

[0015] By adopting the above technical solution, the cooperation of the slide rail and the slider can make the connecting pipe and the scraper automatically adjust the height as the internal surface of the box fluctuates, thereby maintaining a constant distance from the water surface. The scraper with automatically adjustable height can always maintain the best contact distance with the surface of the sewage in the box, effectively collect scum and reduce residue. By accurately controlling the distance between the scraper and the water surface, it can be avoided that the bubbles are crushed due to the scraper being too low, causing the scum to re-enter the water. The scraper with adjustable height can adapt to the fluctuations on the surface of the sewage in the box caused by bubble aggregation, changes in scum thickness, etc., maintain stable scum removal performance, maintain the uniformity of the sewage surface in the box, avoid uneven treatment caused by scum accumulation, reduce the residence time of scum on the surface of the flotation tank, reduce the odor caused by scum decomposition, and improve the operating environment.

[0016] Preferably, the connecting pipe is a hollow structure, the interior of the connecting pipe is connected to a suction pump via a pipeline, and a plurality of openings for sucking scum are provided at the lower part of the connecting pipe.

[0017] By adopting the above technical solution, the scraper scrapes off the scum and accumulates it at the opening of the connecting pipe. The suction pump provides scraping power to the scum at the opening, thereby sucking out the scum.

[0018] Preferably, the plurality of openings are distributed on both sides of the connection between the connecting tube and the scraper blade, and the plurality of openings are close to the scraper blade.

[0019] With the above technical solution, after the scum is scraped off, it will gradually accumulate and rise near the connection between the connecting pipe and the scraper blade. The openings are distributed on both sides of the connection between the connecting pipe and the scraper blade, and the scum near the openings can be sucked out.

[0020] Preferably, a plurality of ultrasonic components are provided on the bottom wall of the box.

[0021] By adopting the above technical scheme, ultrasound can assist the physical cleaning process, reduce or replace the use of chemical flocculants, and reduce chemical pollution; ultrasound combined with the stirring assembly inside the box can improve the physical mixing efficiency of flocculants and other bubbles and pollutants, promote the dispersion of air in water, form more tiny bubbles, and increase the contact area between bubbles and pollutants; the cavitation effect of ultrasound helps to break up the aggregation of pollutants, making them easier to be captured by bubbles and float to the water surface; the introduction of ultrasound can shorten the time of the flotation process and improve the overall treatment efficiency.

[0022] Preferably, the biochemical component comprises a first treatment tank, a second treatment tank, a membrane cleaning tank and a clean water tank which are sequentially connected by pipelines.

[0023] With the above technical solution, the first treatment pool is equipped with high-efficiency bioelastic fillers with hydrolysis and acidification functions to increase the biochemical retention time. The sewage is further mixed, and the high-efficiency bioelastic fillers in the pool are fully utilized as bacterial carriers. The insoluble organic matter in the sewage is converted into soluble organic matter by anaerobic microorganisms, and the macromolecular organic matter is hydrolyzed into small molecular organic matter, which is beneficial to further oxidation and decomposition in the second treatment pool. At the same time, the refluxed nitrate and carbon nitrogen can be partially nitrified and denitrified under the action of nitrifying bacteria to remove ammonia nitrogen, thereby achieving denitrification. At the same time, since the organic matter in the sewage is also consumed during denitrification, the COD index is also reduced. The second treatment pool is composed of a pool body, fillers, water distribution devices, and oxygenated aeration systems. It mainly uses the biofilm method, and the biochemical reaction is carried out by a large number of microbial communities of different species attached to the fillers. Through degradation and adsorption, various organic substances in sewage are removed, and the organic content in sewage is greatly reduced. In the later stage, under the condition of low organic load, the ammonia nitrogen in sewage is degraded by nitrifying bacteria under the condition of sufficient oxygen, and the COD value in sewage is also reduced to a lower level, so that the sewage can be purified. The surfaces of the first treatment tank and the second treatment tank are well insulated to ensure normal operation in winter; the membrane cleaning tank performs solid-liquid separation to remove the biofilm and suspended sludge peeled off in the second treatment tank, and the suspended solids and turbidity of the produced water are almost zero. The treated water quality is good and stable, and can be directly reused, realizing the resource utilization of sewage; the clear water tank is used to store the clean water after treatment.

[0024] An integrated sewage treatment method comprises the following steps:

[0025] Step 1: The sewage collection tank collects sewage transported from the cleaning room;

[0026] Step 2: The first sedimentation tank performs preliminary sedimentation of the sewage;

[0027] Step 3: The sewage initially precipitated in step 2 is passed into the flotation assembly to remove impurities and sludge in the water by flotation;

[0028] Step 4: The wastewater removed by air flotation in step 3 is precipitated again in the second sedimentation tank;

[0029] Step 5: The wastewater that has undergone the second sedimentation in step 4 is passed into the biochemical component for biological decontamination treatment to obtain qualified clean water.

[0030] Preferably, the ultrasonic component for flotation removal of impurities and sludge in water in step 3 of the present application is turned on intermittently, once every 5 seconds.

[0031] The above technical solution is adopted: the intermittently opened ultrasonic component cooperates with the continuously opened diffusion plate bubbles to ensure uniform mixing of the bubbles, and does not cause defoaming due to excessive cavitation effect caused by continuous operation.

[0032] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0033] 1. The treatment efficiency is high and the effluent is stable. It can achieve functions such as oil removal, surfactant removal, nitrogen removal, and phosphorus removal. It adopts modern technical means to achieve automatic control and management, improve the level of automation, reduce operating costs, reduce the workload of daily maintenance and repair, improve workers' operating conditions, and achieve technical reliability and economic rationality.

[0034] 2. The sewage collection tank is used to collect the accumulated water transported from the sludge tank in the cleaning room; the first sedimentation tank can collect sewage and has the primary pollution removal function, which is used to adjust the water volume, homogenize the water quality, and improve the impact resistance of the entire treatment system; the flotation component is used to remove suspended impurities with a density close to that of water and difficult to settle or float naturally. It produces a large number of tiny bubbles in the water, so that the emulsified oil, tiny suspended particles and other pollutants in the wastewater adhere to the bubbles and float to the water surface with the bubbles to form foam, thereby achieving the purpose of separating impurities and purifying wastewater; the second sedimentation tank is used to collect sewage treated by the flotation component; the biochemical component uses biological fillers to convert large-molecule organic matter into small-molecule organic matter, which is further oxidized and decomposed to thoroughly purify the sewage and finally obtain clean water that meets the standards; the lifting pump can extract water from each mechanism to facilitate the transportation of sewage between mechanisms.

[0035] 3. The first dosing device adds medicine into the sewage collection tank at a fixed time and in a fixed quantity to flocculate the sewage; the second dosing device adds medicine into the flotation component to improve the removal rate of impurity sludge in the flotation component.

[0036] 4. The air is dissolved in the pressure tank and mixed with water to form saturated dissolved air water. This process is carried out in the dissolved air system, where the air is dissolved in water under high pressure, and the saturated dissolved air water enters the box through the release component. The design of the release component allows the air dissolved in the water to form tiny bubbles under reduced pressure. When the dissolved air water passes through the release component, the reduction in pressure causes the dissolved air to quickly form a large number of tiny bubbles. These tiny bubbles have a large surface area and can come into contact with pollutants in the water (such as grease, suspended solids, colloidal particles, etc.). Due to the surface tension between the bubbles and the pollutants, the pollutants Pollutants will adhere to the surface of the bubbles. The bubbles with pollutants attached will begin to float to the water surface due to the decrease in overall density and the increase in buoyancy. As the bubbles float up, the attached pollutants gradually gather on the water surface to form a scum layer, which is removed from the water surface by a scraping system, thereby removing the pollutants. The release component is crucial to the flotation effect. It needs to be able to generate enough tiny bubbles, and these bubbles need to have good stability so that they can carry pollutants during the flotation process. In addition, the layout and distribution of the release component will also affect the uniformity of the bubble distribution, thereby affecting the decontamination efficiency of the entire flotation process.

[0037] 5. The diffuser plate distributes the bubbles evenly to various areas of the flotation tank through its designed small holes or gaps, ensuring that the flotation process can be carried out effectively throughout the tank. Evenly distributed bubbles can increase the contact opportunities with pollutants and improve the attachment rate of pollutants and bubbles, thereby improving the removal efficiency of flotation. If bubbles are concentrated in a certain area, it may cause local oversaturation and affect the flotation effect. The diffuser plate can avoid this situation and ensure that the bubbles are evenly distributed throughout the flotation tank. By evenly distributing bubbles, the need for excessive increase in air flow to achieve the desired flotation effect can be reduced, thereby reducing energy consumption. The diffuser plate helps to avoid dead zones or flow dead corners in the flotation tank, which may reduce flotation efficiency. Evenly distributed bubbles can reduce equipment wear or blockage caused by excessive bubbles in local areas, reducing maintenance requirements and costs. The even distribution of multiple diffusers enables the operator to adjust the release amount and distribution of bubbles according to actual conditions, improving operational flexibility.

[0038] 6. The combination of the slide rail and the slider enables the connecting pipe and the scraper to automatically adjust their height as the internal surface of the box fluctuates, thereby maintaining a constant distance from the water surface. The scraper with automatically adjustable height can always maintain the best contact distance with the surface of the sewage in the box, effectively collect scum and reduce residue. By accurately controlling the distance between the scraper and the water surface, it can avoid crushing bubbles due to the scraper being too low, causing the scum to re-enter the water. The scraper with adjustable height can adapt to the fluctuations on the surface of the sewage in the box caused by bubble aggregation, changes in scum thickness, etc., maintain stable scum removal performance, maintain the uniformity of the sewage surface in the box, avoid uneven treatment caused by scum accumulation, reduce the residence time of scum on the surface of the flotation tank, reduce the odor caused by scum decomposition, and improve the operating environment.

[0039] 7. Ultrasonic waves can assist the physical cleaning process, reduce or replace the use of chemical flocculants, and reduce chemical pollution; ultrasonic waves combined with the stirring components inside the box can improve the physical mixing efficiency of flocculants and other bubbles and pollutants, promote the dispersion of air in water, form more tiny bubbles, and increase the contact area between bubbles and pollutants; the cavitation effect of ultrasonic waves helps break up the aggregation of pollutants, making them easier to be captured by bubbles and float to the water surface; the introduction of ultrasonic waves can shorten the time of the flotation process and improve the overall treatment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The present invention will now be described by way of example with reference to the accompanying drawings, in which:

[0041] Figure 1 It is a structural schematic diagram of an integrated sewage treatment equipment in the present invention;

[0042] Figure 2 It is a schematic diagram of the structure of the air flotation assembly in the present invention;

[0043] Figure 3 The present invention Figure 2 A schematic diagram of the enlarged structure of the A part;

[0044] Figure 4 The present invention Figure 2 Schematic diagram of the enlarged structure of part B in the middle.

[0045] Reference numerals

[0046] 1- sewage collecting tank, 2- first sedimentation tank, 3- flotation component, 4- second sedimentation tank, 5- first dosing device, 6- second dosing device, 7- lifting pump, 8- biochemical component, 801- first treatment tank, 802- second treatment tank, 803- membrane cleaning tank, 804- clean water tank, 9- dissolved air system, 10- pH detection module, 11- turbidity detector, 12- slide rail, 13- slide block, 14- connecting pipe, 15- opening, 16- scraper, 17- ultrasonic component, 18- release component, 19- stirring component. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application are clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0048] Example 1

[0049] An integrated sewage treatment device comprises a sewage collecting tank 1, wherein the liquid outlet pipeline of the sewage collecting tank 1 is connected to a first sedimentation tank 2, the liquid outlet pipeline of the first sedimentation tank 2 is connected to an air flotation component 3, the liquid outlet pipeline of the air flotation component 3 is connected to a second sedimentation tank 4, and the liquid outlet pipeline of the second sedimentation tank 4 is connected to a biochemical component 8; a lifting pump 7 is installed on each pipeline; the sewage collecting tank 1 is used to collect the accumulated water transported from the sludge tank in the cleaning room; the first sedimentation tank 2 can collect sewage and has a primary decontamination function, which is used to adjust the water volume, homogenize the water quality, and improve the impact resistance of the entire treatment system; the air flotation component 3 is used to remove the density and water It separates impurities and purifies wastewater by generating a large number of tiny bubbles in the water, so that pollutants such as emulsified oil and tiny suspended particles in the wastewater adhere to the bubbles and float to the water surface with the bubbles to form foam, thereby achieving the purpose of separating impurities and purifying wastewater; the second sedimentation tank 4 is used to collect the sewage treated by the flotation component 3; the biochemical component 8 uses biological fillers to convert large molecular organic matter into small molecular organic matter, which is further oxidized and decomposed to thoroughly purify the sewage and finally obtain clean water that meets the standards; the lifting pump 7 can extract water from each mechanism to facilitate the transportation of sewage between various mechanisms.

[0050] Among them, this equipment is also equipped with a PLC system, which can control the electrical components in the entire equipment in a linked manner.

[0051] Among them, the sewage collection tank 1 is welded with cylindrical Q235 steel, the surface is treated with anti-corrosion, and the effective volume of the tank body is ≥10m 3, height ≤3.2m, tap water injection hole, sewage injection hole, and sediment sewage discharge hole are reserved above the pool body,

[0052] The first sedimentation tank 2 is welded with cylindrical Q235 steel and the surface is treated with anti-corrosion. The effective volume of the tank is ≥15m 3 , height ≤3.2m; the reagent injection hole, sewage injection hole, and sedimentation sewage discharge hole are reserved on the top of the pool body, and a conical inclined pipe sedimentation is installed inside, and the flow rate can reach 36m 3 / (㎡.h); 7-10 times higher than the processing capacity of general sedimentation tanks, the first sedimentation tank 2 is provided with a pH detection module 10, which feeds back the pH value of the sewage collected in the first sedimentation tank 2 to the first dosing device 5, so as to automatically add drugs to adjust the pH value of the sewage, and the pH detection module 10 is linked with the PLC system for control, with a measurement range of -2 to 16PH; resolution: 0.01PH; accuracy: 0.01PH, stability: ≤0.02PH / 24H. Standard liquid: 6.86, 4.00, 9.18, working environment temperature: -5 to 55℃; the connecting cable adopts a shielded cable, with a protection level of IP65, and the control mode is two sets of independent relay control outputs, one set of automatic cleaning relay control output, 4 to 20mA isolated signal output, programmable, with a maximum load of 500Ω, and can timely feed back the pH value of the water quality to the two dosing devices.

[0053] The second sedimentation tank 4 is welded with cylindrical Q235 steel, and the surface is treated with anti-corrosion. The effective volume of the tank is ≥15m 3 , height ≤3.2m, a clean water injection hole and a clean water discharge hole are reserved on the top of the tank body for the flotation component 3, a turbidity detector 11 is arranged inside the second sedimentation tank 4, when it is detected that the turbidity of the water quality input into the second sedimentation tank 4 does not meet the requirements, the water in the second sedimentation tank 4 is transported to the first sedimentation tank 2 for reprocessing; the turbidity meter is disk-mounted (embedded), the detector is linked to the PLC system for control, the measuring range: 0 ~ 200NTU; display mode: LCD; resolution: 0.001NTU, 0.1℃; the turbidity meter can measure low levels of insoluble solids, particles and immiscible fluids in the process liquid.

[0054] Among them, the mechanical seal of the lifting pump 7 is guaranteed to operate reliably within 10,000 hours without replacement, and the sewage lifting capacity is ≥4 tons / hour.

[0055] In this embodiment, the liquid inlet pipe of the sewage collection tank 1 is connected to a first dosing device 5, and the liquid inlet pipe of the air flotation component 3 is connected to a second dosing device 6; the first dosing device 5 regularly and quantitatively injects medicine into the sewage collection tank 1 to flocculate the sewage; the second dosing device 6 adds medicine to the air flotation component 3 to improve the removal rate of impurity sludge in the air flotation component 3.

[0056] Among them, the flocculating solution added in this application is polyaluminium chloride.

[0057] In this embodiment, the air flotation component 3 includes a box body, a scraping system is provided on the box body, a release component 18 is provided on the inner wall of the box body, and a dissolved air system 9 is provided on the outside of the box body, and the dissolved air system 9 is connected to the release component 18 through a pipeline; air is dissolved in a pressure tank and mixed with water to form saturated dissolved air water. This process is carried out in the dissolved air system 9, wherein the air is dissolved in water under high pressure, and the saturated dissolved air water enters the box body through the release component 18. The design of the release component 18 allows the air dissolved in the water to form tiny bubbles under reduced pressure. When the dissolved air water passes through the release component 18, the reduction in pressure causes the dissolved air to quickly form a large number of tiny bubbles. These tiny bubbles have a large surface area and can interact with the water. The air bubbles 18 come into contact with pollutants (such as grease, suspended solids, colloidal particles, etc.). Due to the surface tension between the air bubbles and the pollutants, the pollutants will adhere to the surface of the air bubbles. The bubbles with pollutants attached will experience increased buoyancy due to the decrease in overall density, and will begin to float to the water surface. As the bubbles float, the attached pollutants gradually gather on the water surface to form a scum layer, which is removed from the water surface by a scraping system, thereby achieving the removal of pollutants. The release component 18 is crucial to the flotation effect. It needs to be able to generate enough tiny bubbles, and these bubbles need to have good stability so as to carry pollutants during the floating process. In addition, the layout and distribution of the release component 18 will also affect the uniformity of the bubble distribution, thereby affecting the decontamination efficiency of the entire flotation process.

[0058] The box body is welded with Q235-B carbon steel plate, the interior is anti-corrosive with asphalt paint, the exterior is anti-rust with primer, and the exterior is epoxy resin topcoat.

[0059] In this embodiment, the release assembly 18 includes several diffusion plates, which are evenly distributed on the bottom wall and side walls of the box, and the dissolved air system 9 is connected to the several diffusion plates through pipelines. The diffusion plate distributes the bubbles evenly to various areas of the flotation tank through the small holes or gaps designed thereon, ensuring that an effective flotation process can be carried out in the entire tank. The evenly distributed bubbles can increase the contact opportunities with pollutants and improve the attachment rate of pollutants and bubbles, thereby improving the removal efficiency of flotation. If the bubbles are concentrated in a certain area, it may cause local oversaturation and affect the flotation effect. The diffusion plate can avoid this situation and ensure that the bubbles are evenly distributed in the entire flotation tank. By evenly distributing the bubbles, the need for excessive increase in air flow to achieve the desired flotation effect can be reduced, thereby reducing energy consumption. The diffusion plate helps to avoid dead zones or flow dead corners in the flotation tank, which may reduce the flotation efficiency. The evenly distributed bubbles can reduce equipment wear or blockage caused by excessive bubbles in local areas, reducing maintenance requirements and costs. The even distribution of multiple diffusion plates enables the operator to adjust the release amount and distribution of bubbles according to actual conditions, thereby improving the flexibility of operation.

[0060] In this embodiment, the scraping system includes a connecting pipe 14 and two slide rails 12, the slide rails 12 are respectively arranged on the two inner side walls of the box body, and the two ends of the connecting pipe 14 are connected to the slide rails 12 through two sliders 13 respectively; a scraper 16 is arranged at the lower part of the connecting pipe 14; the slide rails 12 and the slider 13 cooperate to enable the connecting pipe 14 and the scraper 16 to automatically adjust the height with the fluctuation of the inner surface of the box body, so as to maintain a constant distance from the water surface, and the scraper with automatically adjustable height can always maintain the best contact distance with the surface of the sewage in the box body, effectively collect scum and reduce residue, and by accurately controlling the distance between the scraper and the water surface, it can be avoided that the bubbles are crushed due to the scraper being too low, causing the scum to re-enter the water, and the scraper with adjustable height can adapt to the fluctuation of the sewage surface in the box body caused by bubble aggregation, scum thickness change, etc., maintain stable scum removal performance, maintain the uniformity of the sewage surface in the box body, avoid uneven treatment caused by scum accumulation, reduce the residence time of scum on the surface of the flotation tank, reduce the odor caused by scum decomposition, and improve the operating environment.

[0061] The slide rail 12 and the slider 13 are both electric and controlled in conjunction with the PLC system.

[0062] The box body is also provided with a liquid level sensor, which is linked with the PLC control and used in conjunction with the slider 13 and the slide rail 12 to adjust the height of the scraper relative to the scum on the water surface.

[0063] In this embodiment, the connecting pipe 14 is a hollow structure, and the interior of the connecting pipe 14 is connected to a suction pump through a pipeline. The lower part of the connecting pipe 14 is provided with several openings 15 for sucking scum; the scraper 16 scrapes off the scum and accumulates it at the openings 15 on the connecting pipe 14, and the suction pump provides scraping power to the scum at the openings 15, thereby sucking out the scum.

[0064] In this embodiment, several of the openings 15 are distributed on both sides of the connection between the connecting tube 14 and the scraper blade 16 and are close to the scraper blade 16; when the scum is scraped off, it will gradually accumulate and rise, close to the connection between the connecting tube 14 and the scraper blade 16. The openings 15 are distributed on both sides of the connection between the connecting tube 14 and the scraper blade 16, and the scum close to the openings 15 can be sucked out.

[0065] In this embodiment, the bottom wall of the box is provided with several ultrasonic components 17; ultrasonic waves can assist the physical cleaning process, reduce or replace the use of chemical flocculants, and reduce chemical pollution; ultrasonic waves cooperate with the stirring component 19 inside the box to improve the physical mixing efficiency of flocculants and other bubbles and pollutants, promote the dispersion of air in water, form more tiny bubbles, and increase the contact area between bubbles and pollutants; the intermittent cavitation effect of ultrasonic waves helps to break up the aggregation of pollutants, making them easier to be captured by bubbles and float to the water surface; the introduction of ultrasonic waves can shorten the time of the flotation process and improve the overall processing efficiency.

[0066] In this embodiment, the biochemical component 8 includes a first treatment pool 801, a second treatment pool 802, a membrane cleaning pool 803 and a clean water pool 804 connected in sequence by pipelines; the first treatment pool 801 is equipped with a high-efficiency bioelastic filler with a hydrolysis and acidification function to increase the biochemical retention time. The sewage is further mixed, and the high-efficiency bioelastic filler in the pool is fully utilized as a bacterial carrier. The insoluble organic matter in the sewage is converted into soluble organic matter by anaerobic microorganisms, and the macromolecular organic matter is hydrolyzed into small molecular organic matter, so as to facilitate further oxidation and decomposition in the second treatment pool 802. At the same time, the refluxed nitrate and carbon nitrogen can be partially nitrified and denitrified under the action of nitrifying bacteria to remove ammonia nitrogen, thereby achieving denitrification. At the same time, since the organic matter in the sewage is also consumed during denitrification, the COD index is also reduced; the second treatment pool 802 is composed of a pool body, fillers, water distribution devices and oxygenated aeration systems, etc., mainly using the biofilm method, through the biochemical degradation and adsorption of a large number of microbial communities of different species attached to the fillers. The function is to remove various organic substances in the sewage, so that the organic content in the sewage is greatly reduced. In the later stage, under the condition of low organic load, the ammonia nitrogen in the sewage is degraded by the action of nitrifying bacteria under the condition of sufficient oxygen, and the COD value in the sewage is also reduced to a lower level, so that the sewage can be purified. The surfaces of the first treatment tank 801 and the second treatment tank 802 are well insulated to ensure normal operation in winter; the membrane cleaning tank 803 performs solid-liquid separation to remove the biofilm and suspended sludge peeled off in the second treatment tank 802, and the suspended solids and turbidity of the produced water are almost zero. The treated water quality is good and stable, and can be directly reused, realizing the resource utilization of sewage; the clear water tank 804 is used to store the clean water after treatment.

[0067] Among them, the membrane cleaning pool 803 is an MBR (membrane bioreactor) membrane pool, and the volume design meets the requirement of treating 15 tons of sewage per day. The pool body adopts carbon steel anti-corrosion technology. The pool is a vertical flow sedimentation tank, and the water is discharged by a triangular weir, so that the effluent effect is stable; the sludge return pump returns part of the sludge to the first treatment pool 801 for nitrification and denitrification through a timing setting, which also reduces the generation of sludge and is also conducive to the removal of ammonia nitrogen in sewage; the removal rate of major pollutants can reach: COD ≥ 93%, SS = 100%; the selection and replacement of MBR membranes must meet the requirements of economy and maintenance convenience, with a daily water output of ≥ 15 tons, and a detachable water inlet filter grid is added to the water inlet of the MBR membrane pool, and the grid hole is ≤ 1mm. The water quality at the water inlet of the MBR membrane pool must meet the requirements of industrial mineral oil residual rate less than 2%, COD < 400, BOD < 200, ammonia nitrogen < 30, SS < 200, COD < 400; the MBR membrane pool has winter insulation performance to meet the effluent requirements.

[0068] Among them, the volume design of the clear water tank 804 meets the requirement of treating 15 tons of sewage per day, and the tank body adopts carbon steel anti-corrosion technology.

[0069] Example 2

[0070] An integrated sewage treatment method comprises the following steps:

[0071] Step 1: The sewage collection tank 1 collects sewage transported from the sludge tank in the cleaning room;

[0072] When the sewage storage tank 1 reaches 10m 3 When the lifting pump 7 works, the sewage is transported to the first sedimentation tank;

[0073] Step 2: The first sedimentation tank 2 performs preliminary sedimentation on the sewage;

[0074] Step 3: The sewage initially precipitated in step 2 is passed into the flotation component 3 to remove impurities and sludge in the water by flotation;

[0075] Step 4: The wastewater removed by flotation in step 3 is passed through the second sedimentation tank 4 for further sedimentation;

[0076] Step 5: The wastewater after the second sedimentation in step 4 is passed into the biochemical component 8 for biological decontamination treatment to obtain qualified clean water.

[0077] Example 3

[0078] The specific steps for adjusting the scraper position for flotation to remove impurities and sludge in water in step 3 are as follows:

[0079] Step 301: Use a liquid level sensor to monitor the fluctuation of the sewage surface in the tank;

[0080] Step 302: The sensor transmits the monitored data to the PLC control system;

[0081] Step 303: The PLC control system calculates the height to be adjusted of the scraper through an algorithm based on the received data;

[0082] Step 304: The PLC control system sends an adjustment signal to the slide rail 12 and the slider 13;

[0083] Step 305: the slide rail 12 and the slider 13 adjust the height of the scraper 16 according to the signal so as to keep a proper distance from the surface of the sewage in the box;

[0084] Step 306: The liquid level sensor is combined with the PLC system to continuously monitor the changes in the surface of the sewage in the gas box, and adjust the scraper height in real time to adapt to the changing working conditions.

[0085] Example 4

[0086] When the ultrasonic component 17 for flotation removal of impurities and sludge in water in step 3 propagates through water, a local low-pressure area is formed in the liquid, resulting in the formation and instantaneous collapse of bubbles, a process known as cavitation effect; the microjets and shock waves generated when the bubbles collapse can damage the surface of the pollutants, making them more easily captured by the bubbles; high temperatures and high pressures are generated in local areas, helping to decompose difficult-to-degrade organic matter.

[0087] Example 5

[0088] In step 3, the ultrasonic component 17 for flotation removal of impurities and sludge in the water is turned on intermittently, once every 5 seconds, and combined with the continuously turned on diffusion plate bubbles, it can ensure uniform mixing of the bubbles and will not cause defoaming due to excessive cavitation effect caused by continuous operation.

[0089] Example 6

[0090] Different from Example 1, a stirring assembly 19 is provided inside the box. The stirring assembly 19 is a paddle-type stirrer that can generate a larger circulation flow, is suitable for low-speed stirring, and reduces bubble damage. Therefore, it is suitable for flotation systems, especially when gentle stirring is required to promote air dissolution.

[0091] It should be noted that:

[0092] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An integrated sewage treatment equipment, characterized in that: The invention comprises a sewage collecting tank (1), wherein the liquid outlet pipeline of the sewage collecting tank (1) is connected to a first sedimentation tank (2), the liquid outlet pipeline of the first sedimentation tank (2) is connected to an air flotation component (3), the liquid outlet pipeline of the air flotation component (3) is connected to a second sedimentation tank (4), and the liquid outlet pipeline of the second sedimentation tank (4) is connected to a biochemical component (8); and a lifting pump (7) is installed on each pipeline.

2. The integrated sewage treatment equipment according to claim 1, characterized in that: The liquid inlet pipeline of the sewage collection tank (1) is connected to a first dosing device (5), and the liquid inlet pipeline of the air flotation component (3) is connected to a second dosing device (6).

3. The integrated sewage treatment equipment according to claim 1, characterized in that: The air flotation component (3) comprises a box body, a scraping system is arranged on the box body, a release component (18) is arranged on the inner wall of the box body, and a dissolved air system (9) is arranged outside the box body, and the dissolved air system (9) is connected to the release component (18) through a pipeline.

4. The integrated sewage treatment equipment according to claim 3, characterized in that: The release assembly (18) comprises a plurality of diffusion plates, which are evenly distributed on the bottom wall and the side wall of the box body, and the gas dissolving system (9) is connected to the plurality of diffusion plates through pipelines.

5. The integrated sewage treatment equipment according to claim 3, characterized in that: The scraping system comprises a connecting pipe (14) and two slide rails (12), wherein the slide rails (12) are respectively arranged on the two inner side walls of the box body, and the two ends of the connecting pipe (14) are respectively connected to the slide rails (12) through two sliding blocks (13); a scraper (16) is arranged at the lower part of the connecting pipe (14).

6. The integrated sewage treatment equipment according to claim 5, characterized in that: The connecting pipe (14) is a hollow structure, the interior of the connecting pipe (14) is connected to a suction pump via a pipeline, and a plurality of openings (15) for sucking scum are arranged at the lower part of the connecting pipe (14).

7. The integrated sewage treatment equipment according to claim 6, characterized in that: The plurality of openings (15) are distributed on both sides of the connection between the connecting pipe (14) and the scraper blade (16), and the plurality of openings (15) are close to the scraper blade (16).

8. The integrated sewage treatment equipment according to claim 3, characterized in that: The bottom wall of the box is provided with a plurality of ultrasonic components (17).

9. The integrated sewage treatment equipment according to claim 1, characterized in that: The biochemical component (8) comprises a first treatment tank (801), a second treatment tank (802), a membrane cleaning tank (803) and a clean water tank (804) which are sequentially connected by pipelines.

10. An integrated sewage treatment method, characterized in that: The following steps are involved: Step 1: The sewage collection tank (1) collects sewage transported from the sludge tank in the cleaning room; Step 2: The first sedimentation tank (2) performs preliminary sedimentation on the sewage; Step 3: The sewage initially precipitated in step 2 is passed into the flotation assembly (3) to remove impurities and sludge in the water by flotation; Step 4: The wastewater removed by flotation in step 3 is passed through a second sedimentation tank (4) for further sedimentation; Step 5: The wastewater that has undergone the second sedimentation in step 4 is passed into the biochemical component (8) for biological decontamination treatment to obtain qualified clean water.

Images