Sewage treatment system and method

Abstract

The sewage treatment system comprises a pretreatment unit, a biological treatment unit and a deep treatment unit which are connected in sequence, and the biological treatment unit comprises a biological reaction tank and a secondary sedimentation tank which are connected through a conveying pipeline; the secondary sedimentation tank is divided into a plurality of silt settling areas from the center to the edge, namely a silt settling area I, a silt settling area II and a silt settling area III; the secondary sedimentation tank comprises a sludge scraping plate and a sludge discharge pipe used for guiding out sediment sludge, the sediment sludge in the first sediment area, the second sediment area and the third sediment area is scraped by the sludge scraping plate, the sediment sludge in the first sediment area and the third sediment area is guided into the sludge treatment unit through a sludge suction port, and the sediment sludge in the second sediment area is guided into the biological reaction tank. According to the invention, the sludge is collected in different areas according to the difference of sludge settling properties in different settling areas, so that the sludge concentration in the returned sludge and the proportion of microorganisms with excellent biochemical properties are improved; by continuously screening the sludge in different regions, microbial populations with high settling velocity and excellent biochemical performance are obtained, and the effluent quality is improved.

Description

Technical Field

[0001] The present invention relates to the field of sewage treatment, and in particular to a sewage treatment system and method. Background Art

[0002] At present, sewage treatment technology generally adopts the overall process route of pretreatment + secondary treatment + deep treatment, among which secondary treatment is the most important process section, generally based on biological treatment. Biological treatment uses the pollutants contained in sewage as a nutrient source, and utilizes the metabolism of microorganisms to degrade the pollutants and purify the sewage. At present, activated sludge method and biofilm method are commonly used in biological treatment, among which activated sludge method accounts for more than 85%. Secondary treatment generally includes biological reactor and secondary sedimentation tank. The biological reactor is the main place for pollutant removal, and the secondary sedimentation tank is used for mud and water separation. The supernatant is discharged to the deep treatment stage. Part of the bottom mud is returned to the biological reactor to maintain the concentration of microorganisms in the biological reactor to ensure the treatment effect, and part of it is sent to the sludge treatment system as residual sludge.

[0003] The activated sludge process is relatively simple, but its operation has many control parameters and influencing factors. It is easily affected by factors such as filamentous bacteria expansion, scum foam, sludge floating, and insufficient proportion of nitrifying bacteria in the activated sludge, which ultimately affect the effluent quality. In short, the number, state and quality of microorganisms in the biological reactor are the key to the success or failure of sewage treatment. The source of microorganisms in the biological reactor comes from the return sludge of the secondary sedimentation tank, so the quality of the return sludge of the secondary sedimentation tank is particularly important.

[0004] At present, the main types of secondary sedimentation tanks equipped with activated sludge method are circular radial flow secondary sedimentation tank, rectangular radial flow secondary sedimentation tank and rectangular horizontal flow secondary sedimentation tank. Regardless of the type of secondary sedimentation tank, the current return sludge adopts the method of indiscriminate collection of sedimented sludge on the bottom of the whole tank and then return and discharge. This has the inherent disadvantage of not collecting and returning the sludge according to different sedimentation properties and microbial activities, resulting in many problems such as large return volume, low quality of return sludge, inconvenient operation and management of biological reactor, which is not conducive to the performance of sewage treatment efficiency, resulting in unstable water treatment effect and difficulty in meeting increasingly stringent emission standards.

[0005] In addition, when scraping off the sludge in the existing secondary sedimentation tank, there will always be dead corners where the sludge accumulates. When the sludge accumulates in the dead corners for more than a certain period of time, the accumulated sludge will undergo anaerobic metabolism, producing a large amount of H2S, CH4 and other gases that are wrapped around the mud blocks, causing the sludge to float up in large chunks. At the same time, it will also produce a foul odor, which seriously affects the water treatment quality of the secondary sedimentation tank.

[0006] Therefore, the problems existing in the prior art need to be further improved and developed. Summary of the invention

[0007] (I) Purpose of the invention: In order to solve the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a sewage treatment system and method that can perform zoned return of sludge in the secondary sedimentation tank.

[0008] (II) Technical solution: In order to solve the above technical problems, the present technical solution provides a sewage treatment system, comprising a pretreatment unit, a biological treatment unit, a deep treatment unit, and an intelligent control center connected in sequence, wherein the biological treatment unit comprises a biological reaction tank and a secondary sedimentation tank connected by a delivery pipeline; The secondary sedimentation tank is divided into a plurality of sedimentation areas from the center to the edge: sedimentation area 1, sedimentation area 2 and sedimentation area 3; the secondary sedimentation tank comprises a scraper, a sludge discharge pipe for guiding out the sedimentation sludge and N sludge corruption monitoring devices arranged in the secondary sedimentation tank; the scraper comprises a scraper in area 1, a scraper in area 2 and a scraper in area 3, the scraper in area 1 is in contact with the bottom surface of the sedimentation area 1 of the secondary sedimentation tank, the scraper in area 2 is in contact with the bottom surface of the sedimentation area 2 of the secondary sedimentation tank, and the scraper in area 3 is in contact with the bottom surface of the sedimentation area 3 of the secondary sedimentation tank; The sludge discharge pipe includes a sludge return pipe and a sludge discharge pipe, and the scraper plates in zone 1, zone 2 and zone 3 are respectively provided with sludge suction ports, and the sludge suction ports on the scraper plates in zone 1 and zone 3 are connected to the sludge discharge pipe through a conveying pipe, and the sludge discharge pipe is connected to the sludge treatment unit, and the sludge suction port on the scraper plates in zone 2 is connected to the sludge return pipe through a conveying pipe, and the sludge return pipe is connected to the biological reaction tank; The sludge decomposition monitoring device is used to monitor the decomposition of the sludge in the secondary sedimentation tank to obtain decomposition data. The intelligent control center uses a multidimensional partitioning method to determine the decomposition parameters of the decomposed sludge according to the decomposition data, and the mobile sludge suction device cleans the sediment sludge at the target location.

[0009] Among them, the length of the scraper blade in zone one is equal to the length of the sludge zone one, the length of the scraper blade in zone two is equal to the length of the sludge zone two, and the length of the scraper blade in zone three is equal to the length of the sludge zone three.

[0010] Wherein, each scraper is provided with a plurality of mud suction ports, and the mud suction ports are arranged in sequence on the scraper.

[0011] Wherein, the intelligent control center receives the real-time monitoring results of N sludge decay monitoring devices; The intelligent control center includes a model creation unit, an analysis unit and a display unit. The model creation unit creates a three-dimensional model of the secondary sedimentation tank based on the secondary sedimentation tank data input by the input unit. The analysis unit uses a multidimensional partitioning method to determine the decomposition parameters of the decomposed sludge based on the decomposition data. The display unit displays the decomposition parameters of the decomposed sludge and the three-dimensional model.

[0012] Wherein, when determining the decay parameters of the decayed sludge according to the decay data, the analysis unit adopts a multidimensional partitioning method to determine the decay parameters, specifically including: Among the N sludge decay monitoring devices, a sludge decay monitoring device whose decay data at adjacent moments is greater than a first threshold is selected as a central sludge decay monitoring device; According to the corruption data monitored by each sludge corruption monitoring device at different times, respectively calculating the accumulation radius corresponding to the central sludge corruption monitoring device and the M sludge corruption monitoring devices adjacent to the central sludge corruption monitoring device; Marking the accumulation radii corresponding to the central sludge corruption monitoring device and the M sludge corruption monitoring devices adjacent to the central sludge corruption monitoring device in the three-dimensional model to obtain a marked three-dimensional model; In the marked three-dimensional model, the overlapping area of ​​the accumulation radius corresponding to the central sludge corruption monitoring device and the M sludge corruption monitoring devices adjacent to the central sludge corruption monitoring device is selected as the accumulation area of ​​the corrupted sludge; The accumulated volume of the corrupted sludge is determined based on the corruption data monitored at different times by the central sludge corruption monitoring device and M sludge corruption monitoring devices adjacent to the central sludge corruption monitoring device, and the area of ​​the corrupted sludge accumulation region corresponding to the central sludge corruption monitoring device.

[0013] The accumulation radius refers to the radius where sediment sludge may accumulate in the sludge corruption monitoring device; M is an integer greater than or equal to 2.

[0014] When determining the accumulated volume of the corrupted sludge, the analysis unit determines the accumulated volume of the corrupted sludge according to the change rates of the central sludge corrupting monitoring device and the M sludge corrupting monitoring devices adjacent to the central sludge corrupting monitoring device at different times.

[0015] The display unit renders the corruption parameters corresponding to each central sludge corruption monitoring device in the three-dimensional model by adopting a selective rendering mechanism to obtain a target three-dimensional model, and displays the target three-dimensional model.

[0016] The display unit renders the corruption parameters corresponding to each central sludge corruption monitoring device in the three-dimensional model by using a selective rendering mechanism to obtain a target three-dimensional model, specifically including: Mounting a rendering selection detection part on the marked three-dimensional model; In the marked three-dimensional model, according to the stacking radius corresponding to each marked central sludge corruption monitoring device and the M sludge corruption monitoring devices adjacent to the central sludge corruption monitoring device, the marked three-dimensional model is divided into an occlusion area and a display area; Performing sludge corruption rendering in the display area to obtain a target three-dimensional model; The display unit displays the target three-dimensional model.

[0017] A sewage treatment method, applied to the above-mentioned sewage treatment system, comprises the following steps: Step 1: the pretreatment unit pre-treats the wastewater to be treated to obtain primary treated water; Step 2: The biological treatment unit performs secondary treatment on the primary treated water to obtain secondary treated water and sediment sludge; Step 3, the precipitated sludge is returned to the biological treatment unit, or discharged from the sewage treatment system after treatment; Step 4: The deep treatment unit performs deep treatment on the secondary treated water to obtain purified water that meets the discharge standards.

[0018] (III) Beneficial effects: The sewage treatment system and method of the present invention collects sludge in different zones according to the difference in the settling performance of sludge in different sedimentation areas, and selects the settling sludge with good sludge settling performance and high microbial activity for the return sludge, thereby increasing the sludge concentration and the proportion of microorganisms with excellent biochemical performance in the return sludge. At the same time, the secondary sedimentation tank continuously screens the sludge by zones to obtain a microbial population with fast settling speed and excellent biochemical performance, thereby increasing the microbial concentration in the biological reaction tank, increasing the proportion of microorganisms with excellent performance, improving the denitrification and phosphorus removal effect, and improving the effluent water quality; in addition, the decomposition parameters are determined according to the real-time decomposition data to ensure that the sedimentation sludge in the dead corners of the secondary sedimentation tank is cleaned in a timely and accurate manner, further ensuring the effluent water quality of the secondary sedimentation tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the water treatment process of the sewage treatment system of the present invention; Figure 2 It is a schematic diagram of the top view of the secondary sedimentation tank of the sewage treatment system of the present invention; Figure 3 It is a schematic diagram of the sedimentation partition structure of the secondary sedimentation tank of the sewage treatment system of the present invention; Figure 4 It is a schematic diagram of the cross-sectional structure of the secondary sedimentation tank of the sewage treatment system of the present invention; 1-inlet; 2-outlet; 3-sludge discharge pipe; 4-sludge return pipe; 6-outlet trough; 9-sludge scraper in zone 1; 10-sludge scraper in zone 2; 11-sludge scraper in zone 3; 12-sludge zone 1; 13-sludge zone 2; 14-sludge zone 3. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with preferred embodiments. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0021] The accompanying drawings are schematic diagrams of embodiments of the present invention. It should be noted that the drawings are only examples and are not drawn to scale, and should not be used to limit the actual protection scope of the present invention.

[0022] A sewage treatment system includes a pretreatment unit, a biological treatment unit, and a deep treatment unit. Figure 1 As shown, the pretreatment unit, the biological treatment unit, and the deep treatment unit are connected in sequence, and the sewage to be treated passes through the pretreatment unit, the biological treatment unit, and the deep treatment unit in sequence to achieve the treatment of the sewage to be treated. The pretreatment unit is used for the pretreatment process of the sewage to be treated, that is, to pretreat the sewage to be treated to obtain primary treated water. The biological treatment unit performs secondary treatment on the primary treated water to obtain secondary treated water and sludge, and the sludge can be returned to the biological treatment unit, or discharged from the sewage treatment system after treatment. The deep treatment unit performs deep treatment on the secondary treated water to obtain purified water that meets the discharge standards.

[0023] The pretreatment process includes removing larger suspended matter, floating matter and some inorganic particles in the sewage. Specifically, the pretreatment unit can remove larger suspended matter, floating matter and some inorganic particles in the sewage, reduce the load of subsequent treatment units, and protect the normal operation of the equipment.

[0024] The pretreatment unit includes a primary water treatment device and a pretreatment effluent monitoring device. The primary water treatment device is used to implement the pretreatment process of the sewage to be treated, that is, to remove larger suspended matter, floating matter and some inorganic particles in the sewage, so as to obtain the primary treated water. The pretreatment effluent monitoring device is arranged at the outlet of the primary water treatment device, and is used to monitor the data parameters of the sewage discharged by the primary water treatment device in real time, that is, the first quality parameter. The pretreatment effluent monitoring device is connected to the intelligent control center, and the pretreatment effluent monitoring device sends the monitored first quality parameter to the intelligent control center in real time.

[0025] The biological treatment unit includes a secondary treatment device and a secondary treatment monitoring device. The secondary treatment device includes a biological reaction tank and a secondary sedimentation tank. The biological reaction tank and the secondary sedimentation tank are connected by a conveying pipeline. Specifically, the discharge port of the biological reaction tank is connected to the input port 1 of the secondary sedimentation tank through the conveying pipeline. The biological reaction tank adopts an activated sludge biological treatment method to remove organic pollutants and part of nitrogen and phosphorus nutrients in sewage to obtain a biological reaction mixed water body. The secondary sedimentation tank is used for mud and water separation to precipitate the sludge in the biological reaction mixed water body. The precipitated sludge is called sedimentation sludge, and the supernatant is called secondary treatment effluent, that is, secondary treatment water. The activated sludge contains a large number of microorganisms. Under aerobic conditions, the microorganisms metabolize and decompose the organic pollutants in the sewage as nutrients and convert them into carbon dioxide, water and their own cell substances.

[0026] The secondary treatment monitoring device is connected to the intelligent control respectively, and the secondary treatment monitoring device includes biological reaction monitoring, mixed water monitoring and supernatant monitoring. The biological reaction monitoring is arranged in the biological reaction tank, and is used to monitor the sludge supply and demand parameters in the biological reaction tank in real time. The mixed water monitoring is arranged at the discharge port of the biological reaction tank, and is used to monitor the quality parameters of the biological reaction mixed water in real time. The supernatant monitoring is arranged at the outlet tank 6 of the secondary sedimentation tank, and is used to monitor the quality parameters of the secondary treated water in real time.

[0027] The secondary sedimentation tank can be a circular radial flow type, a rectangular radial flow type, and a rectangular horizontal flow type. The conveying pipeline connecting the secondary sedimentation tank and the biological reaction tank can preferably be connected to the center of the secondary sedimentation tank. At this time, the biological reaction mixed water and / or the distribution water enters the secondary sedimentation tank from the center of the secondary sedimentation tank and diffuses to the edge of the secondary sedimentation tank. The secondary sedimentation tank is divided into a plurality of sludge areas from the center to the edge, which can be three areas of sludge area 12, sludge area 2 13, and sludge area 3 14. Since the biological reaction mixed water enters the secondary sedimentation tank from the center of the secondary sedimentation tank and diffuses to the edge of the sedimentation tank, the sludge in the biological reaction mixed water gradually settles at the bottom of the secondary sedimentation tank. Therefore, the sludge in different areas has significantly different properties. Among them, the sedimentation sludge in the sedimentation area 1 has good sedimentation performance, but the sedimentation sludge activity is not high, and the inorganic component is high; the sedimentation sludge in the sedimentation area 3 has poor sedimentation performance, and the organic component in the sedimentation sludge is high; the sedimentation sludge in the sedimentation area 2 has better properties than the sedimentation area 2 13 and the sedimentation area 3 14, and its sedimentation performance and organic component are high, and the microbial activity is higher.

[0028] like Figure 2-4 As shown, here we take the circular radial flow type secondary sedimentation tank as an example for explanation.

[0029] The secondary sedimentation tank includes a tank body, a water outlet trough, a working bridge, a scraper and a sludge discharge pipe. The water outlet trough is arranged at the edge of the mud in the tank body, and the height of the side away from the tank body is less than the height of the tank body, and is used to discharge the secondary treated water in the tank body. The working bridge is arranged above the tank body, and the scraper is connected to the working bridge and contacts the bottom surface of the tank body. The scraper is used to remove the precipitated sludge in the secondary sedimentation tank. When the working bridge rotates, the scraper rotates around the central axis of the tank body on the bottom surface of the tank body. The sludge discharge pipe is used to discharge the precipitated sludge in the secondary sedimentation tank.

[0030] The scraper blades include a scraper blade 9 in zone 1, a scraper blade 10 in zone 2, and a scraper blade 11 in zone 3. The scraper blades 9 in zone 1, 10 in zone 2, and 11 in zone 3 extend sequentially from the central axis of the second sedimentation tank to the edge of the second sedimentation tank. In addition, the scraper blade 9 in zone 1 is in contact with the bottom surface of the first sedimentation zone 12 of the second sedimentation tank, the scraper blade 10 in zone 2 is in contact with the bottom surface of the second sedimentation zone 13 of the second sedimentation tank, and the scraper blade 11 in zone 3 is in contact with the bottom surface of the third sedimentation zone 14 of the second sedimentation tank. The sum of the lengths of the scraper blades 9 in zone 1, 10 in zone 2, and 11 in zone 3 is equal to the length of the sedimentation area of ​​the second sedimentation tank.

[0031] The length of the zone 1 scraper blade 9 is equal to the length of the sludge zone 12 , the length of the zone 2 scraper blade 10 is equal to the length of the sludge zone 2 13 , and the length of the zone 3 scraper blade 11 is equal to the length of the sludge zone 3 14 .

[0032] The scraper is provided with a mud suction port, which is used to suck the sediment scraped by the scraper. Specifically, the scraper 9 of zone 1, the scraper 10 of zone 2, and the scraper 11 of zone 3 are respectively provided with a mud suction port. Multiple mud suction ports can be provided on each scraper, and the mud suction ports are arranged on the scraper in sequence. When the scraper 9 of zone 1, the scraper 10 of zone 2, and the scraper 11 of zone 3 scrape the sediment at the bottom of the second sedimentation tank, the mud suction ports on the scraper 9 of zone 1, the scraper 10 of zone 2, and the scraper 11 of zone 3 respectively suck the sediment in the corresponding sedimentation area.

[0033] The sludge discharge pipeline of the secondary sedimentation tank includes a sludge return pipeline 4 and a sludge discharge pipeline 3. The sludge suction ports on the zone 1 scraper 9 and the zone 3 scraper 11 are connected to the sludge discharge pipeline 3 through a conveying pipe, and the sludge discharge pipeline 3 is connected to the sludge treatment unit, and the sludge treatment unit treats the sludge to be discharged and then discharges it from the sewage treatment system. The sludge suction port on the zone 2 scraper 10 is connected to the sludge return pipeline 4 through a conveying pipe, and the sludge return pipeline 4 is connected to the biological reaction tank. The sludge return pipeline 4 introduces the sludge with good sedimentation performance, high concentration, and high microbial activity into the biological reaction tank. Specifically, the sludge return pipeline 4 introduces the sludge from the second sedimentation zone 13 into the biological reaction tank, so as to increase the concentration of microorganisms in the biological reaction tank, increase the proportion of highly active microorganisms, improve the denitrification and phosphorus removal effects, and improve the effluent water quality.

[0034] The sludge treatment unit treats the precipitated sludge discharged from the sludge discharge pipe 3 to achieve reduction, stabilization and harmlessness. The sludge treatment unit includes sludge concentration, sludge digestion, sludge dehydration and sludge treatment monitoring. Sludge concentration reduces the moisture content of sludge and the volume of sludge by gravity concentration to achieve mud-water separation. Sludge digestion includes anaerobic digestion equipment and aerobic digestion equipment. The anaerobic digestion equipment uses anaerobic microorganisms to decompose organic matter in the sludge under anaerobic conditions to produce biogas, thereby achieving sludge stabilization and resource utilization; the aerobic digestion equipment stabilizes the sludge through the action of aerobic microorganisms under aerobic conditions. Sludge dehydration is used to remove moisture from the sludge, so that the sludge forms a mud cake for easy transportation and disposal. Sludge treatment monitoring is used to monitor sludge parameters in the sludge treatment device in real time.

[0035] The deep treatment unit is used to remove residual pollutants in sewage to make the water quality reach higher standards. It includes a coagulation and sedimentation unit, a filtration unit, a disinfection unit and a sewage deep treatment effluent monitoring unit. The coagulation and sedimentation unit adds coagulants to the water to make the coagulants and tiny suspended solids condense into large particles, and then remove them through precipitation, effectively reducing turbidity and removing some organic matter and heavy metal ions. The filtration unit further removes fine particles, colloids, some soluble organic matter and microorganisms by using filter media. The disinfection unit kills pathogenic microorganisms by disinfection to ensure water quality safety. The effluent monitoring unit of the deep treatment unit is used to monitor the data parameters of the sewage discharged by the deep treatment unit in real time. The coagulation and sedimentation unit, the filtration unit, and the disinfection unit are connected in sequence through a conveying pipeline.

[0036] The secondary sedimentation tank also includes a mobile sludge suction device, which cleans the sediment sludge at the target position. The mobile sludge suction device includes a scraper, a sludge suction pipeline, a shooting device, a mobile device and a display. The sludge suction pipeline is arranged on the scraper, and the scraper is fixed to the mobile device by a fixing rod. The shooting device can be fixed on one end of the fixing rod close to the scraper. The shooting device collects the accumulation of sediment sludge near the scraper in real time and displays it on the display. The scraper scrapes the sediment sludge at the target position in real time according to the shooting device. Specifically, the administrator adjusts the position of the mobile device and the fixing rod through the image displayed on the display to clean the sediment sludge at the target position. When the scraper scrapes and cleans the sediment sludge, the sludge suction pipeline absorbs the sediment sludge scraped by the scraper, and the end of the sludge suction pipeline away from the scraper is connected to the sludge treatment unit.

[0037] The secondary treatment monitoring device also includes a sludge corruption monitoring device arranged in the secondary sedimentation tank, and the sludge corruption monitoring device is used to monitor the corruption of the sludge in the secondary sedimentation tank and obtain corruption data. The sludge corruption monitoring device includes N, where N is an integer greater than 1. Among them, N is optimally an integer greater than 10. The sludge corruption monitoring devices are evenly distributed at the bottom of the secondary sedimentation tank, or according to the dead corners of scraping the precipitated sludge, the sludge corruption monitoring devices are evenly distributed around the dead corners of scraping. When the sludge corruption monitoring device monitors the corruption of the sludge in the secondary sedimentation tank, it can also sample the biological reaction mixed water body at a designated position in the secondary sedimentation tank, and then the sludge corruption monitoring device detects it. There is no specific limitation here.

[0038] The sewage treatment system also includes an intelligent control center, which receives real-time monitoring results from each monitoring device. The intelligent control center includes a model creation unit, an analysis unit and a display unit. The model creation unit creates a three-dimensional model of the secondary sedimentation tank based on the secondary sedimentation tank data input by the input unit. The analysis unit determines the decomposition parameters of the decomposed sludge based on the decomposition data, and the decomposition parameters include the accumulation position and accumulation volume of the decomposed sludge. The display unit displays the decomposition parameters of the decomposed sludge and the three-dimensional model to facilitate the timely cleaning of the decomposed sludge.

[0039] The three-dimensional model is a proportional model of the secondary sedimentation tank, including the shape and size of the secondary sedimentation tank and various components attached to the secondary sedimentation tank. The various components attached to the secondary sedimentation tank include various components for realizing water treatment, secondary treatment monitoring devices, etc.

[0040] The sludge decay monitoring device can be one or more of a hydrogen sulfide detection device, a methane detection device, a pH value detection device, or a detection device for changes in other key substances during sludge decay, such as increase or decrease, which is not specifically limited here.

[0041] The corrosion data at least includes detection values, for example, one or more of hydrogen sulfide detection values, methane detection values, and pH values.

[0042] When determining the decay parameters of the decayed sludge according to the decay data, the analysis unit adopts a multidimensional partitioning method to determine the decay parameters. Specifically, Among the N sludge decay monitoring devices, a sludge decay monitoring device whose decay data at adjacent moments is greater than a first threshold is selected as a central sludge decay monitoring device; According to the corruption data monitored by each sludge corruption monitoring device at different times, the accumulation radius corresponding to the central sludge corruption monitoring device and the M sludge corruption monitoring devices adjacent to the central sludge corruption monitoring device are calculated respectively; the accumulation radius refers to: the radius where the sludge may accumulate in the sludge corruption monitoring device; M is an integer greater than or equal to 2; Marking the accumulation radii corresponding to the central sludge corruption monitoring device and the M sludge corruption monitoring devices adjacent to the central sludge corruption monitoring device in the three-dimensional model to obtain a marked three-dimensional model; In the marked three-dimensional model, the overlapping area of ​​the accumulation radius corresponding to the central sludge corruption monitoring device and the M sludge corruption monitoring devices adjacent to the central sludge corruption monitoring device is selected as the accumulation area of ​​the corrupted sludge; The accumulated volume of the corrupted sludge is determined based on the corruption data monitored at different times by the central sludge corruption monitoring device and M sludge corruption monitoring devices adjacent to the central sludge corruption monitoring device, and the area of ​​the corrupted sludge accumulation region corresponding to the central sludge corruption monitoring device.

[0043] The analysis unit includes a standard value of the accumulation radius. When the difference between the corruption data and the standard value of the accumulation radius is larger, the corrupted sludge is closer to the sludge corruption monitoring device that obtains the corruption data, and the location where the sediment sludge accumulation is generated is closer to the sludge corruption monitoring device that obtains the corruption data. With the sludge corruption monitoring device that obtains the corruption data as the center, the radius (accumulation radius) at which the corrupted sludge accumulation may occur is smaller, and vice versa, the radius (accumulation radius) at which the corrupted sludge accumulation may occur is larger.

[0044] The analysis unit includes a stacking radius comparison table, which is a comparison table of the difference between the decay data and the stacking radius standard value, and the distance between the decayed sludge and the sludge decay monitoring device to obtain the decay data. The stacking radius standard value and the stacking radius comparison table can be input or modified through the input unit.

[0045] When the stacking radii corresponding to the central sludge corruption monitoring device and the M sludge corruption monitoring devices adjacent to the central sludge corruption monitoring device are calculated respectively according to the corruption data monitored by each sludge corruption monitoring device at different times, the analysis unit calculates the difference between the corruption data and the standard value of the stacking radius, and according to the difference, selects the distance between the sludge corruption monitoring devices corresponding to the corrupted sludge distance to obtain the corruption data in the stacking radius comparison table, that is, obtains the stacking radius corresponding to the sludge corruption monitoring device.

[0046] When determining the accumulated volume of the corrupted sludge, the analysis unit determines the accumulated volume of the corrupted sludge according to the change rates of the change values ​​of the central sludge corruption monitoring device and the M sludge corruption monitoring devices adjacent to the central sludge corruption monitoring device at different times. Specifically, when the change rates of the change values ​​of the central sludge corruption monitoring device and the M sludge corruption monitoring devices adjacent to the central sludge corruption monitoring device at different times are greater, the accumulated volume of the corrupted sludge is greater; when the change rates of the change values ​​of the central sludge corruption monitoring device and the M sludge corruption monitoring devices adjacent to the central sludge corruption monitoring device at different times are smaller, the accumulated volume of the corrupted sludge is smaller.

[0047] The accumulation volume here not only represents the amount of sedimentation sludge accumulation, but also represents the impact of the accumulation of decomposed sludge on the water quality of water treatment: the larger the accumulation volume of decomposed sludge, the greater the impact of the accumulation of decomposed sludge on the water quality of water treatment; the smaller the accumulation volume of decomposed sludge, the smaller the impact of the accumulation of decomposed sludge on the water quality of water treatment.

[0048] The analysis unit also includes a decay data change rate standard value, a stacking volume comparison table, a first decay sludge stacking height threshold, and a second decay sludge stacking height threshold. The decay data change rate standard value, the stacking volume comparison table, the first decay sludge stacking height threshold, and the second decay sludge stacking height threshold can be input or modified through an input unit, and the first decay sludge stacking height threshold is less than the second decay sludge stacking height threshold. When the difference between the decay data change rate and the decay data change rate standard value is greater, the stacking volume of the decay sludge is greater; when the difference between the decay data change rate and the decay data change rate standard value is smaller, the stacking volume of the decay sludge is smaller.

[0049] The accumulation volume comparison table is a comparison table between the difference between the change rate of the corruption data and the standard value of the change rate of the corruption data, and the accumulation volume corresponding to the sludge corruption monitoring device that obtains the corruption data.

[0050] When the accumulation volume of the corrupted sludge is determined according to the corruption data monitored at different times by the central sludge corruption monitoring device and the M sludge corruption monitoring devices adjacent to the central sludge corruption monitoring device, and the area of ​​the corrupted sludge accumulation region corresponding to the central sludge corruption monitoring device, specifically, the analysis unit calculates the difference between the change rate of the corruption data and the standard value of the change rate of the corruption data, and selects the accumulation volume corresponding to the sludge corruption monitoring device that obtains the corruption data in the accumulation volume comparison table according to the difference; the accumulation height is calculated according to the accumulation volume and the area of ​​the corrupted sludge accumulation region corresponding to the central sludge corruption monitoring device, and the accumulation volume is verified: when the calculated accumulation height is greater than or equal to the first corrupted sludge accumulation height threshold and less than or equal to the second corrupted sludge accumulation height threshold, the accumulation volume is verified to be normal; when the calculated accumulation height is less than the first corrupted sludge accumulation height threshold, or greater than the second corrupted sludge accumulation height threshold, the accumulation volume is abnormal and the verification fails, and the analysis unit can recalculate the accumulation volume according to the above steps according to the corruption data at other times.

[0051] The display unit can also render the corruption parameters corresponding to each central sludge corruption monitoring device in the three-dimensional model using a selection rendering mechanism to obtain a target three-dimensional model and display the target three-dimensional model. The administrator can clean up the accumulated corrupted sludge in time according to the target three-dimensional model to ensure the effluent quality of the secondary sedimentation tank.

[0052] The display unit renders the corruption parameters corresponding to each central sludge corruption monitoring device in the three-dimensional model by using a selection rendering mechanism to obtain a target three-dimensional model, which specifically includes the following steps: A rendering selection detection component is mounted on the marked three-dimensional model; the rendering selection detection component is used to detect the occluded area of ​​the marked model, and avoid rendering the occluded area when rendering the corrupted sludge accumulation; In the marked three-dimensional model, according to the stacking radius corresponding to each marked central sludge corruption monitoring device and the M sludge corruption monitoring devices adjacent to the central sludge corruption monitoring device, the marked three-dimensional model is divided into an occlusion area and a display area; Performing sludge corruption rendering in the display area to obtain a target three-dimensional model; The display unit displays the target three-dimensional model.

[0053] The display area is the accumulation area of ​​the corrupted sludge corresponding to each central sludge corruption monitoring device in the marked three-dimensional model. Specifically, the display area is the overlapping area of ​​the accumulation radius corresponding to each central sludge corruption monitoring device and the M sludge corruption monitoring devices adjacent to the central sludge corruption monitoring device in the marked three-dimensional model. The display area is the rendering area when the sludge corruption is rendered.

[0054] In the marked three-dimensional model, except for the display area, all other areas are the occlusion area. The occlusion area is an area that needs to be avoided from rendering when rendering the sludge corruption.

[0055] A sewage treatment method, applied to the above sewage treatment system, specifically comprises the following steps: Step 1: the pretreatment unit pre-treats the wastewater to be treated to obtain primary treated water; Step 2: The biological treatment unit performs secondary treatment on the primary treated water to obtain secondary treated water and sediment sludge; Step 3, the precipitated sludge is returned to the biological treatment unit, or discharged from the sewage treatment system after treatment; Step 4: The deep treatment unit performs deep treatment on the secondary treated water to obtain purified water that meets the discharge standards.

[0056] A sewage treatment system and method collects sludge by zones according to the difference in sedimentation performance of sludge in different sedimentation areas, selects sedimentation sludge with good sedimentation performance and high microbial activity for return sludge, and increases the sludge concentration and the proportion of microorganisms with excellent biochemical performance in the return sludge. At the same time, the secondary sedimentation tank continuously screens the sludge zones to obtain microbial populations with fast sedimentation speed and excellent biochemical performance, thereby increasing the microbial concentration in the biological reaction tank, increasing the proportion of microorganisms with excellent performance, improving the denitrification and phosphorus removal effects, and improving the effluent water quality.

[0057] In addition, the decay parameters can be determined based on the real-time decay data to ensure timely and accurate cleaning of the sediment sludge in the dead corners of the secondary sedimentation tank, further ensuring the effluent quality of the secondary sedimentation tank; at the same time, the 3D model can be rendered, allowing the administrator to more intuitively determine the location of the sediment sludge in the dead corners of the secondary sedimentation tank and choose the best cleaning time. When rendering the 3D model, the selective rendering mechanism is used, which not only allows accurate rendering of the display area, but also reduces performance consumption, reduces the configuration requirements of the intelligent control center, and improves the rendering speed.

[0058] The above content is an explanation of the preferred embodiments of the present invention, which can help those skilled in the art to more fully understand the technical solution of the present invention. However, these embodiments are merely illustrative, and it cannot be determined that the specific implementation methods of the present invention are limited to the description of these embodiments. For ordinary technicians in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions and transformations can be made, which should be regarded as belonging to the protection scope of the present invention.

Claims

1. A sewage treatment system, characterized in that: It includes a pretreatment unit, a biological treatment unit, and a deep treatment unit connected in sequence, wherein the biological treatment unit includes a biological reaction tank and a secondary sedimentation tank connected by a conveying pipeline; The secondary sedimentation tank is divided into a plurality of sedimentation areas from the center to the edge: sedimentation area 1, sedimentation area 2 and sedimentation area 3; the secondary sedimentation tank comprises a scraper, a sludge discharge pipe for guiding out the sedimentation sludge and N sludge corruption monitoring devices arranged in the secondary sedimentation tank; the scraper comprises a scraper in area 1, a scraper in area 2 and a scraper in area 3, the scraper in area 1 is in contact with the bottom surface of the sedimentation area 1, the scraper in area 2 is in contact with the bottom surface of the sedimentation area 2, and the scraper in area 3 is in contact with the bottom surface of the sedimentation area 3; the sludge corruption monitoring device is used to monitor the corruption of the sludge in the secondary sedimentation tank and obtain corruption data; The sludge discharge pipe includes a sludge return pipe and a sludge discharge pipe. The scraper plate in zone 1, the scraper plate in zone 2 and the scraper plate in zone 3 are respectively provided with sludge suction ports. The sludge suction ports on the scraper plate in zone 1 and the scraper plate in zone 3 are connected to the sludge discharge pipe through a conveying pipe. The sludge discharge pipe is connected to a sludge treatment unit. The sludge suction port on the scraper plate in zone 2 is connected to the sludge return pipe through a conveying pipe. The sludge return pipe is connected to the biological reaction tank.

2. A sewage treatment system according to claim 1, characterized in that: The length of the scraper blade in zone 1 is equal to the length of the first sludge zone, the length of the scraper blade in zone 2 is equal to the length of the second sludge zone, and the length of the scraper blade in zone 3 is equal to the length of the third sludge zone.

3. A sewage treatment system according to claim 1, characterized in that: Each scraper is provided with a plurality of suction ports, which are arranged in sequence on the scraper.

4. A sewage treatment system according to claim 1, characterized in that: It also includes an intelligent control center, which receives real-time monitoring results of N sludge decay monitoring devices; after the intelligent control center uses a multi-dimensional partitioning method to determine the decay parameters of the decayed sludge according to the decay data, the mobile sludge suction device cleans the sediment sludge at the target position; The intelligent control center includes a model creation unit, an analysis unit and a display unit. The model creation unit creates a three-dimensional model of the secondary sedimentation tank based on the secondary sedimentation tank data input by the input unit. The analysis unit uses a multidimensional partitioning method to determine the decomposition parameters of the decomposed sludge based on the decomposition data. The display unit displays the decomposition parameters of the decomposed sludge and the three-dimensional model.

5. A sewage treatment system according to claim 4, characterized in that: When the analysis unit determines the decay parameters of the decayed sludge according to the decay data, a multidimensional partitioning method is used to determine the decay parameters, specifically including: Among the N sludge decay monitoring devices, a sludge decay monitoring device whose decay data at adjacent moments is greater than a first threshold is selected as a central sludge decay monitoring device; According to the corruption data monitored by each sludge corruption monitoring device at different times, respectively calculating the accumulation radius corresponding to the central sludge corruption monitoring device and the M sludge corruption monitoring devices adjacent to the central sludge corruption monitoring device; Marking the accumulation radii corresponding to the central sludge corruption monitoring device and the M sludge corruption monitoring devices adjacent to the central sludge corruption monitoring device in the three-dimensional model to obtain a marked three-dimensional model; In the marked three-dimensional model, the overlapping area of ​​the accumulation radius corresponding to the central sludge corruption monitoring device and the M sludge corruption monitoring devices adjacent to the central sludge corruption monitoring device is selected as the accumulation area of ​​the corrupted sludge; The accumulated volume of the corrupted sludge is determined based on the corruption data monitored at different times by the central sludge corruption monitoring device and M sludge corruption monitoring devices adjacent to the central sludge corruption monitoring device, and the area of ​​the corrupted sludge accumulation region corresponding to the central sludge corruption monitoring device.

6. A sewage treatment system according to claim 5, characterized in that: The accumulation radius refers to: the radius where sediment sludge accumulation may occur in the sludge corruption monitoring device; M is an integer greater than or equal to 2.

7. A sewage treatment system according to claim 5, characterized in that: When determining the accumulated volume of the corrupted sludge, the analysis unit determines the accumulated volume of the corrupted sludge according to the change rates of the central sludge corrupting monitoring device and the M sludge corrupting monitoring devices adjacent to the central sludge corrupting monitoring device at different times.

8. A sewage treatment system according to claim 5, characterized in that: The display unit renders the corruption parameters corresponding to each central sludge corruption monitoring device in the three-dimensional model using a selection rendering mechanism to obtain a target three-dimensional model, and displays the target three-dimensional model.

9. A sewage treatment system according to claim 8, characterized in that: The display unit renders the corruption parameters corresponding to each central sludge corruption monitoring device in the three-dimensional model by using a selection rendering mechanism to obtain a target three-dimensional model, specifically including: Mounting a rendering selection detection part on the marked three-dimensional model; In the marked three-dimensional model, according to the stacking radius corresponding to each marked central sludge corruption monitoring device and the M sludge corruption monitoring devices adjacent to the central sludge corruption monitoring device, the marked three-dimensional model is divided into an occlusion area and a display area; Performing sludge corruption rendering in the display area to obtain a target three-dimensional model; The display unit displays the target three-dimensional model.

10. A sewage treatment method, applied to the sewage treatment system according to any one of claims 1 to 9, characterized in that: The following steps are included: Step 1: the pretreatment unit pre-treats the wastewater to be treated to obtain primary treated water; Step 2: The biological treatment unit performs secondary treatment on the primary treated water to obtain secondary treated water and sediment sludge; Step 3, the precipitated sludge is returned to the biological treatment unit, or discharged from the sewage treatment system after treatment; Step 4: The deep treatment unit performs deep treatment on the secondary treated water to obtain purified water that meets the discharge standards.

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