Control method for recycling supernatant of thickening tank based on reconstruction technology of drainage tank air floatation

Abstract

The application discloses a concentrated pool supernatant recycling control method based on a drainage pool air floatation reconstruction technology, relates to the field of supernatant recycling control, and comprises the following steps: performing preliminary processing on a multi-source water body data set by using the air floatation reconstruction technology, generating a plurality of water body processing data, extracting concentrated pool supernatant, performing ultrafiltration membrane processing on the concentrated pool supernatant, generating an ultrafiltration membrane processing result, placing third supernatant in a tail water recovery pool for equalization regulation, and performing intelligent recycling control on the supernatant based on the regulation result. The method solves the technical problem that traditional concentrated pool supernatant and sludge dewatering liquid are disposed by being discharged, sludge dewatering liquid has an impact on safety and health, and the sludge dewatering liquid cannot be directly recycled, realizes the problems that concentrated pool supernatant and sludge dewatering liquid are difficult to recycle, there is no suitable discharge route, guarantees the safety and stability of sludge water recycling in a water supply plant, and achieves the technical effect of realizing the operation and management target of "zero discharge" of the water supply plant.

Description

Technical Field

[0001] This application relates to the field of supernatant reuse control, and in particular to a method for supernatant reuse control of thickeners based on drainage tank flotation modification technology. Background Technology

[0002] As a crucial component of water supply projects, water plants primarily function to produce drinking water that meets national standards, ensuring the water needs of urban residents and businesses. Currently, most water plants employ conventional treatment processes such as coagulation, sedimentation, filtration, and disinfection. When conventional processes are insufficient to guarantee water quality, advanced treatment processes such as ozone-activated carbon treatment and membrane treatment are added to enhance pollutant removal capabilities. During the operation of water plants, the sludge discharge from reaction sedimentation tanks, filter backwash water, and other production wastewater are collectively referred to as sludge discharge water. Sludge discharge water consumption accounts for approximately 3% to 8% of the daily treated water volume. To achieve sludge discharge water reuse, reduce the water plant's self-consumption rate, and strengthen water resource recycling, water plants typically install sludge discharge water treatment systems. Currently, mainstream and relatively complete sludge discharge water treatment systems generally consist of processes such as regulation, concentration, and dewatering. While this method achieves the reuse of most sludge discharge water, there are still instances of supernatant from the concentration tank and sludge dewatering liquid being discharged externally, failing to achieve zero discharge of sludge discharge water. Summary of the Invention

[0003] This application provides a control method for the reuse of supernatant from thickeners based on drainage tank flotation modification technology. This method solves the technical problem that traditional methods of discharging supernatant from thickeners and sludge dewatering liquid externally cause safety and health risks to the sludge dewatering liquid and make it impossible to directly reuse it. The method effectively addresses the difficulties in reusing supernatant from thickeners and sludge dewatering liquid and the lack of suitable external discharge outlets, ensuring the safe and stable reuse of sludge discharge water from water supply plants and achieving the technical effect of achieving the "zero discharge" operation and management goal of water supply plants.

[0004] This application provides a method for controlling the reuse of supernatant from a thickener based on air flotation retrofit technology for drainage ponds, comprising: receiving multi-source water bodies through a drainage pond in a target area to obtain a multi-source water body dataset; performing preliminary processing on the multi-source water body dataset using air flotation retrofit technology to generate multiple water body treatment data; extracting supernatant from the thickener based on the multiple water body treatment data, performing ultrafiltration membrane treatment on the supernatant to generate an ultrafiltration membrane treatment result; placing a third supernatant in a tailwater recovery tank based on the ultrafiltration membrane treatment result; performing equilibration adjustment on the tailwater recovery tank, and intelligently controlling the reuse of the supernatant based on the adjustment result.

[0005] In a possible implementation, based on the ultrafiltration membrane treatment results, the third supernatant is placed before the effluent recovery tank and subjected to the following treatment: sludge dewatering is performed on the supernatant from the thickening tank after ultrafiltration membrane treatment using a flocculant to obtain sludge-water separation results; a dewatering liquid conditioning tank is constructed, and the sludge-water separation results are processed through the dewatering liquid conditioning tank to generate a dewatering conditioning result; the dewatering conditioning result is analyzed to determine the dewatering liquid and bottom sludge; the dewatering liquid is purified using an ultrafiltration membrane treatment process to generate a first supernatant and backwash water; the bottom sludge is transferred to a sludge balancing tank for conditioning, and sludge dewatering is performed according to the sludge conditioning results to generate a second supernatant, backwash water, and sludge cake; the backwash water is input into a drainage tank, the sludge cake is transported off-site, and the first and second supernatants are input into a biological activated carbon filter for treatment, generating the third supernatant based on the treatment results.

[0006] In a possible implementation, the following process is performed: inputting the backwash water into the drainage tank includes conveying the backwash water after ultrafiltration membrane treatment to the drainage tank and storing the remaining backwash wastewater in the drainage tank for conditioning and flotation treatment.

[0007] In a possible implementation, the first supernatant and the second supernatant are fed into a biological activated carbon filter for treatment. Based on the treatment result, a third supernatant is generated, and the following processes are performed: the first supernatant and the second supernatant are subjected to activated carbon adsorption in the biological activated carbon filter to generate a first treatment result; the first supernatant and the second supernatant are biodegraded based on the first treatment result to generate a second treatment result; the first supernatant and the second supernatant are biocatalytically oxidized based on the second treatment result to generate a third treatment result; and the first treatment result, the second treatment result, and the third treatment result are integrated to generate the third supernatant.

[0008] In a possible implementation, based on the effluent recovery tank, the following processing is performed: effluent from the drainage tank, ultrafiltration membrane effluent from the thickener supernatant, and effluent from the biological activated carbon filter are collected uniformly to generate an effluent dataset, which includes water quality and quantity information; the third supernatant is homogenized using the effluent recovery tank in conjunction with the water quality information to generate first adjustment information; the third supernatant is adjusted using the effluent recovery tank in conjunction with the quantity information to generate second adjustment information; and the first and second adjustment information are added to the adjustment result.

[0009] In a possible implementation, intelligent reuse control of the supernatant is performed based on the adjustment results, and the following processing is executed: extracting the recycled water quality information and recycled water volume information of the tailwater recycling tank based on the adjustment results; determining whether the recycled water quality information meets the expected water quality standard based on the first adjustment information, and determining whether the recycled water volume information meets the expected water volume standard based on the second adjustment information; if the recycled water quality information meets the expected water quality standard and the recycled water volume information meets the expected water volume standard, then generating an extraction command, extracting water from the tailwater recycling tank based on the extraction command to obtain recycled water, and transporting the recycled water to the distribution well for storage.

[0010] In a possible implementation, the following processing is performed: if the recovered water quality information meets the expected water quality standard, but the recovered water volume information does not meet the expected water volume standard, a first backtracking instruction is generated; water volume backtracking is performed on all nodes using the first backtracking instruction to generate a water volume backtracking result; based on the water volume backtracking result, loss calculation is performed on the recovered water volume information; when the water volume loss is less than a preset loss threshold, the expected water volume standard is updated to generate an expected water volume update standard; the recovered water volume information is compared with the expected water volume update standard; when the recovered water volume information meets the expected water volume standard, the extraction instruction is generated.

[0011] In a possible implementation, the following processing is performed: if the recovered water quality information does not meet the expected water quality standard, but the recovered water volume information meets the expected water volume standard, a second backtracking instruction is generated; the analysis unit is activated by the second backtracking instruction, and water quality analysis is performed on the supernatant of the effluent recovery tank based on the analysis unit to generate water quality analysis results; the drainage tank, thickening tank, and biological activated carbon filter are matched according to the water quality analysis results to determine the target tank; the supernatant of the effluent recovery tank is backtracked to the target tank for iterative processing until the recovered water quality information meets the expected water quality standard, and the extraction instruction is generated.

[0012] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0013] The thickener supernatant reuse control method based on drainage tank flotation modification technology provided in this application solves the technical problem that traditional methods of discharging thickener supernatant and sludge dewatering liquid externally cause safety and health impacts on sludge dewatering liquid and make direct reuse impossible. This method effectively solves the problems of difficulty in reusing thickener supernatant and sludge dewatering liquid and lack of suitable external discharge outlets, ensuring the safe and stable reuse of sludge discharge water from water supply plants and achieving the technical effect of achieving the "zero discharge" operation and management goal of water supply plants. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Flowcharts are used in this application to illustrate the operations performed by the method according to the embodiments of the present application. It should be understood that the preceding or following operations are not necessarily performed precisely in sequence. Instead, various steps can be processed in reverse order or simultaneously as needed. Furthermore, other operations can be added to these processes, or one or more steps can be removed from these processes.

[0015] Figure 1 A schematic flowchart of a method for controlling the reuse of supernatant from a thickener based on a drainage tank flotation retrofit technology, provided in an embodiment of this application.

[0016] Figure 2 A schematic diagram of the supernatant treatment process of the thickener supernatant reuse control method based on drainage tank air flotation modification technology provided in the embodiments of this application. Detailed Implementation

[0017] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description of this application will be provided in conjunction with the accompanying drawings. The described embodiments should not be considered as limitations on this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] In the following description, references to "some embodiments" describe a subset of all possible embodiments. However, it is understood that "some embodiments" may be the same or different subsets of all possible embodiments and may be combined with each other without conflict. The terms "first" and "second" are used merely to distinguish similar objects and do not represent a specific ordering of objects. The terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, product, or server that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or modules not explicitly listed or inherent to these processes, methods, products, or devices. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only.

[0020] This application provides a method for controlling the reuse of supernatant from a thickener based on a drainage tank flotation retrofit technology, such as... Figure 1 As shown, the method includes:

[0021] Step A100 involves receiving multi-source water bodies through drainage ponds in the target area to obtain a multi-source water body dataset. First, the target area requiring multi-source water body reception is determined. This target area can be an industrial or urban area with multiple water sources, including rainwater, surface runoff, industrial wastewater, and domestic sewage. Drainage ponds are deployed within the target area as centralized reception and treatment facilities for the multi-source water bodies. The drainage ponds should have sufficient capacity and processing power to handle the simultaneous inflow of water from different sources, and each water source should have an independent reception channel or pipeline system.

[0022] Furthermore, various types of sensors are deployed at different locations in the drainage pool to collect water quality parameters of different water bodies. Through the deployed sensors, water quality data of each water source flowing into the drainage pool is collected in real time. The collected data is transmitted to a centralized data processing system via wired or wireless networks to form a real-time multi-source water body dataset.

[0023] Step A200 involves using air flotation modification technology to preliminarily process the multi-source water dataset, generating multiple water treatment data sets. An air flotation device is installed in the drainage tank, its size and processing capacity adapted to variations in flow and water quality from different water sources. A microbubble generator is also installed, which can pressurize air to generate numerous tiny bubbles. These bubbles contact suspended solids in the water, forming scum. Based on the flow and water quality characteristics of the multi-source water dataset, water from different sources is introduced into the drainage tank through pipes or channels. Air flotation technology is a highly efficient water treatment technology. By introducing microbubbles into the water, suspended solids, organic matter, algae, and other small particles adhere to the bubbles and rise to the surface, forming scum. After the scum is scraped off, the remaining water undergoes further treatment to significantly reduce pollutant concentrations. The remaining water enters a tailwater recycling tank for subsequent reuse, and the amount, composition, and removal efficiency of the scum are recorded, thus generating multiple water treatment data sets.

[0024] Step A300 involves extracting the supernatant from the thickener tank based on the multiple water treatment data sets, subjecting the supernatant to ultrafiltration membrane treatment, and generating ultrafiltration membrane treatment results. Data related to the supernatant from the thickener tank is selected from the multiple water treatment datasets generated during the flotation process. This data typically includes key water quality parameters such as flow rate, turbidity, COD, suspended solids content, and pH value. Then, using a dedicated pipeline or transport system, the qualified supernatant from the thickener tank can be guided from the flotation unit to the ultrafiltration membrane treatment unit. A suitable ultrafiltration membrane material is selected for the supernatant, such as a micro / nano ceramic membrane. This micro / nano ceramic membrane has a small pore size (less than 0.1 micrometers), effectively intercepting suspended solids, bacteria, viruses, and other microorganisms while maintaining a high water flux.

[0025] Further adjustments to the influent flow rate and pressure are made based on the supernatant flow rate and water quality parameters to adapt to the working conditions of the ultrafiltration membrane, ensuring optimal membrane filtration. Under a certain pressure, the supernatant passes through the ultrafiltration membrane, where suspended solids, bacteria, viruses, and particulates are trapped upstream of the membrane, while clean water permeates through the membrane pores into the downstream treatment unit. During the ultrafiltration process, online monitoring equipment collects water quality data of the treated supernatant. Monitoring parameters include turbidity, COD, suspended solids content, total bacterial count, conductivity, and pH value. The real-time collected water quality data is then recorded in a database and correlated with the pre-treatment supernatant data to obtain the ultrafiltration membrane treatment results.

[0026] Step A400 involves placing the third supernatant in a tailwater recovery tank based on the ultrafiltration membrane treatment result; in one possible implementation, the third supernatant is placed in the tailwater recovery tank before the ultrafiltration membrane treatment result is executed, as follows: Figure 2As shown, step A400 further includes step A410, using a flocculant to dewater the supernatant from the thickener treated by the ultrafiltration membrane, obtaining a sludge-water separation result; step A420, constructing a dewatering liquid conditioning tank, and processing the sludge-water separation result through the dewatering liquid conditioning tank to generate a dewatering conditioning result; step A430, analyzing the dewatering conditioning result to determine the dewatering liquid and bottom sludge; step A440, purifying the dewatering liquid using an ultrafiltration membrane treatment process to generate a first supernatant and backwash water; step A450, processing the bottom sludge... The sludge is transferred to a sludge equalization tank for conditioning. Based on the conditioning results, the sludge is dewatered, producing a second supernatant, backwash water, and sludge cake. First, a flocculant (such as anionic polyacrylamide) is added to the supernatant from the ultrafiltration membrane treatment thickener to promote the coagulation of suspended solids and other particles, facilitating efficient sludge-water separation. Through flocculation, suspended solids agglomerate into larger particles, forming flocs. These flocs settle to the bottom of the tank under gravity, thus achieving sludge-water separation. A dewatering liquid conditioning tank is then constructed to collect and treat the dewatered liquid after sludge-water separation. This conditioning tank should have sufficient capacity and regulation capabilities to accommodate fluctuations in the flow rate and water quality of the dewatered liquid, addressing the discontinuous and unstable characteristics of the dewatered liquid and playing a role in collecting, regulating, and ensuring the stable operation of subsequent processes.

[0027] In the dewatering liquid equalization tank, the dewatering liquid and the sludge-water separation results are combined. Through the settling and slow-flowing effect of the equalization tank, solid particles further settle, generating a relatively clear equalization result. This equalization result consists of two parts: an upper layer of relatively clear dewatering liquid and a lower layer of deposited bottom sludge. Further within the dewatering liquid equalization tank, the dewatering equalization result is separated into an upper layer of dewatering liquid and a lower layer of bottom sludge. Effective separation of the dewatering liquid and bottom sludge can be achieved through methods such as settling or decantation, ensuring that both can enter their respective treatment processes. The separated dewatering liquid is then introduced into an ultrafiltration membrane treatment system for further purification. After ultrafiltration membrane treatment, the dewatering liquid is separated into a clear first supernatant and backwash water. The first supernatant can be used for further reuse, while the backwash water is returned to the drainage tank or retreated. Simultaneously, the separated bottom sludge is transferred to a sludge balance tank for further equalization. Sludge balancing tanks are used to homogenize the moisture content and viscosity of bottom sludge to ensure the stability and efficiency of the subsequent sludge dewatering process. Within the sludge balancing tank, the conditions of the sludge are appropriately adjusted (such as adding conditioning agents or adjusting the tank environment) based on water quality monitoring results to optimize the dewatering effect.

[0028] Finally, the adjusted sludge is introduced into sludge dewatering equipment (such as belt filter press, centrifuge, etc.) for mechanical dewatering, generating sludge cake with a high solid content. During the sludge dewatering process, a second supernatant and backwash water are separated. This process ensures the efficient reuse of supernatant, stable dewatering treatment of sludge, and recycling of water resources within the system, achieving the dual goals of water quality improvement and environmental protection.

[0029] In step A460, the backwash water is input into a drainage tank, the sludge cake is transported off-site, and the first supernatant and the second supernatant are input into a biological activated carbon filter for treatment, generating the third supernatant based on the treatment results. In one possible implementation, step A460 further includes step A461, where inputting the backwash water into the drainage tank includes transporting the backwash water treated by the ultrafiltration membrane to the drainage tank and storing it together with the remaining backwash wastewater in the drainage tank for conditioning and flotation treatment.

[0030] The second supernatant can be reused after treatment, while the backwash water is returned to the system for further treatment, ultimately producing the first supernatant, second supernatant, backwash water, and sludge cake. The backwash water generated during the ultrafiltration membrane treatment process is reintroduced into the drainage tank. The drainage tank uses air flotation to preliminarily treat suspended solids and contaminants in the backwash water, ensuring water quality is recycled within the system. Backwash water is generated periodically during ultrafiltration membrane treatment. This backwash water contains suspended solids, microorganisms, and other impurities retained from the supernatant. This backwash water is transported to the drainage tank through a specially designed pipeline system. During transport, a stable flow rate is ensured, and the water quality parameters of the backwash water (such as suspended solids concentration and COD) are monitored in real time for subsequent treatment.

[0031] Furthermore, in addition to the backwash water generated by ultrafiltration membrane treatment, other treatment units in the system (such as biological activated carbon filters, sand filters, etc.) also generate backwash wastewater. This backwash wastewater typically contains particulates, suspended solids, organic matter, and some dissolved pollutants. This backwash wastewater is temporarily stored in a designated area of ​​the drainage pond for centralized management before conditioning and treatment.

[0032] In one possible implementation, step A460 further includes step A462, where the first supernatant and the second supernatant are subjected to activated carbon adsorption through the biological activated carbon filter to generate a first treatment result; step A463, where the first supernatant and the second supernatant are biodegraded based on the first treatment result to generate a second treatment result; step A464, where the first supernatant and the second supernatant are biocatalytically oxidized based on the second treatment result to generate a third treatment result; and step A465, where the first treatment result, the second treatment result, and the third treatment result are integrated to generate the third supernatant.

[0033] First, the first and second supernatants, treated by ultrafiltration membranes, are introduced into a biological activated carbon filter. The biological activated carbon filter is filled with granular or columnar activated carbon, possessing a highly developed pore structure that effectively adsorbs organic pollutants, metal ions, and other trace pollutants in the water. As the first and second supernatants flow through the activated carbon filter, the organic matter and other pollutants in the water are adsorbed by the surface and pore structure of the activated carbon. These pollutants bind with the activated carbon through physical and chemical adsorption, remaining in the filter media, thereby purifying the water. After activated carbon adsorption treatment, most of the dissolved organic matter and metal ions in the supernatant are removed, resulting in the first treatment outcome.

[0034] Secondly, in activated carbon filters, the surface of activated carbon particles is usually covered with a biofilm. These biofilms are composed of bacteria, fungi, and other microorganisms, which can further degrade organic pollutants adsorbed on the surface of activated carbon or in the water. Based on the first treatment result, the material continues to flow through the biofilm layer in the biological activated carbon filter. These microorganisms degrade the residual organic pollutants into harmless carbon dioxide, water, and other inorganic substances through metabolic activities. After biodegradation, most of the organic pollutants in the first and second supernatants are completely decomposed, generating a purer second treatment result.

[0035] Subsequently, in the biological activated carbon filter, specific catalysts or catalytically active substances can work synergistically with the biofilm to promote the oxidative decomposition of recalcitrant organic pollutants. Adding oxidants (such as hydrogen peroxide, ozone, etc.) to the filter generates highly active oxygen free radicals or other oxidizing substances through interaction with the catalyst, enhancing the degradation capacity of organic pollutants. After biocatalytic oxidation treatment, the residual pollutants in the first and second supernatants are further oxidized and removed, resulting in a third treatment result with a higher degree of purification.

[0036] Finally, the water quality data from the first, second, and third treatment results are integrated and analyzed to comprehensively assess the water quality changes throughout the entire treatment process, determine the final degree of water quality improvement, and, based on the integrated analysis results, determine the final generated third supernatant. The third supernatant should meet the set water quality standards and satisfy the requirements for reuse or discharge, thus achieving deep purification and recycling of water quality.

[0037] The placement of the third supernatant in the effluent recovery tank based on ultrafiltration membrane treatment results refers to the process of obtaining the third supernatant through multiple processes including ultrafiltration membrane treatment, activated carbon adsorption, biodegradation, and biocatalytic oxidation. The water quality has been significantly improved, meeting the standards for reuse or further treatment. It is then confirmed that the effluent recovery tank has sufficient capacity to accommodate the third supernatant and adequate space for water quality adjustment and balancing. Furthermore, the online water quality monitoring equipment in the recovery tank is ensured to be operating normally, allowing for real-time monitoring of various water indicators to promptly detect anomalies and make adjustments. The third supernatant is transported from the biological activated carbon filter to the effluent recovery tank via a pre-designed pipeline system. This pipeline system should be leak-proof and equipped with valves to adjust the flow rate as needed, ensuring the third supernatant is evenly distributed into the effluent recovery tank and mixed with other treated water. This provides strong support for the continuous operation of the water plant and the recycling of water resources.

[0038] Next, step A500 is executed, where the wastewater is balanced and regulated based on the tailwater recovery tank, and the supernatant is intelligently reused based on the regulation result. In one possible implementation, step A500 further includes step A510, where the effluent from the drainage tank, the supernatant from the thickener ultrafiltration membrane, and the effluent from the biological activated carbon filter are collected uniformly to generate an effluent dataset, which includes water quality information and water quantity information; step A520 is executed, where the third supernatant is homogenized using the wastewater recovery tank in conjunction with the water quality information to generate first regulation information; step A530 is executed, where the third supernatant is regulated using the wastewater recovery tank in conjunction with the water quantity information to generate second regulation information; and step A540 is executed, where the first regulation information and the second regulation information are added to the regulation result.

[0039] The effluent from the drainage tank, the ultrafiltration membrane effluent from the thickener tank, and the effluent from the biological activated carbon filter were collected uniformly. The drainage tank effluent refers to the treated water from the drainage tank, which has undergone preliminary air flotation treatment to remove most suspended solids and some organic pollutants. The ultrafiltration membrane effluent from the thickener tank refers to the effluent after ultrafiltration membrane treatment, with significantly improved water quality and fewer suspended solids and microorganisms. The biological activated carbon filter effluent refers to the effluent after activated carbon adsorption and biodegradation treatment, further purifying the water and removing most organic pollutants and dissolved metal ions. Online monitoring equipment was used to monitor the water quality at each effluent outlet in real time, and water flow information was also collected from each outlet. Instantaneous and cumulative flow data were recorded using flow meters to ensure accurate control of the effluent volume at each outlet. The water quality and flow information collected from all outlets were then integrated to generate a unified effluent dataset. This dataset contains detailed information on effluent from different sources, providing a basis for subsequent water quality adjustment and homogenization operations.

[0040] Furthermore, effluent from different sources is mixed in a tailwater recovery tank to homogenize the overall water quality, reducing the impact of water quality fluctuations on subsequent treatment processes. Utilizing the water quality information concentrated in the effluent dataset, the water quality characteristics of effluent from different sources are analyzed, and the optimal homogenization ratio is calculated to ensure that the final third supernatant meets the expected water quality standards. In the tailwater recovery tank, using a stirring device or natural slow flow, the effluent from the drainage tank, the supernatant from the thickener, the ultrafiltration membrane effluent, and the effluent from the biological activated carbon filter are homogenized according to the calculated ratio to generate a homogenized water body. After homogenization, the homogenized water quality parameters are recorded to generate the first adjustment information, which serves as the basis for subsequent water quality adjustments.

[0041] Furthermore, the inflow of water from various sources is adjusted to ensure that the outflow of water from the tailwater recovery tank meets the system's design requirements, avoiding excessive or insufficient fluctuations in the water supply system. Using the water volume information collected in the effluent dataset, the flow rate at each outlet is analyzed to determine the water volume parameters that need adjustment, ensuring that each source of water is supplied as needed. By adjusting the flow control devices of valves or pumps, the inflow of each water source is precisely adjusted to ensure that the water volume in the tailwater recovery tank remains stable. After the water volume adjustment is completed, the adjusted water volume parameters are recorded, generating a second adjustment information to ensure the overall system's operational stability.

[0042] Finally, the first set of regulation information (water quality homogenization results) and the second set of regulation information (water quantity regulation results) are integrated, and their interrelationship is analyzed to ensure that water quality and water quantity regulation are coordinated and do not interfere with each other. Through comprehensive analysis of the integrated regulation information, the final regulation result is generated. This result will guide the operation of the effluent recovery tank and optimize subsequent water treatment processes. The generated regulation result will be fed back to the control system of the effluent recovery tank to achieve automated water quality and water quantity control, ensuring the quality and stability of the effluent from the effluent recovery tank.

[0043] In one possible implementation, step A500 further includes step A550, extracting the recycled water quality information and recycled water volume information of the tailwater recycling tank based on the adjustment result; executing step A560, determining whether the recycled water quality information meets the expected water quality standard based on the first adjustment information, and determining whether the recycled water volume information meets the expected water volume standard based on the second adjustment information; executing step A570, if the recycled water quality information meets the expected water quality standard and the recycled water volume information meets the expected water volume standard, generating an extraction command, extracting water from the tailwater recycling tank based on the extraction command to obtain recycled water, and transporting the recycled water to the distribution well for storage.

[0044] Extracting the quality and quantity of recycled water from the tailwater recovery tank based on the adjustment results can be achieved by installing online water quality monitoring equipment, including turbidity sensors, COD sensors, pH sensors, and dissolved oxygen sensors, in the tailwater recovery tank to monitor the water quality in real time. These devices collect various water quality parameters of the recycled water in the tank in real time, forming a recycled water quality information dataset. Simultaneously, flow meters are installed at the inlet and outlet of the tailwater recovery tank to monitor the flow rate of the recycled water in real time. Through these devices, the changes in the recycled water quantity within the tailwater recovery tank are accurately recorded, and the monitored flow data is compiled into a recycled water quantity information dataset. This dataset should include information such as the total recycled water quantity, instantaneous flow rate, and inlet / outlet flow balance.

[0045] Furthermore, the extracted recycled water quality information is compared and analyzed with the expected water quality standards in the first adjustment information. The system analyzes whether various water quality indicators meet the predetermined quality standards, such as turbidity, COD, BOD, and dissolved oxygen. Then, the extracted recycled water volume information is compared with the expected water volume standards in the second adjustment information to check whether it meets the set water volume range and flow requirements. Only when both the recycled water quality and volume information meet the expected standards is the system ensured to achieve dual compliance of water quality and volume. Once the conditions are met, an extraction command is generated to instruct the tailwater recycling tank to extract reclaimed water. Based on the extraction command, the water pump in the tailwater recycling tank is started to extract the compliant reclaimed water from the tank. The extraction process should be smooth and efficient, avoiding disturbance to the water quality in the recycling tank. During the extraction process, water quality and volume information are continuously monitored to ensure that the extracted reclaimed water always meets the expected standards. If any abnormality is detected during the extraction process, the system will immediately stop the extraction operation, issue an alarm, and transport the extracted reclaimed water to the distribution well.

[0046] In one possible implementation, step A570 further includes step A571: if the recovered water quality information meets the expected water quality standard, but the recovered water volume information does not meet the expected water volume standard, then a first backtracking instruction is generated; step A572 is executed, using the first backtracking instruction to perform water volume backtracking on all nodes, generating a water volume backtracking result; step A573 is executed, based on the water volume backtracking result, loss calculation is performed on the recovered water volume information, and when the water volume loss is less than a preset loss threshold, then the expected water volume standard is updated, generating an expected water volume update standard; step A574 is executed, comparing the recovered water volume information with the expected water volume update standard, and when the recovered water volume information meets the expected water volume standard, the extraction instruction is generated.

[0047] First, it is determined whether the recycled water quality information meets the expected water quality standards. If the water quality meets the standards, but the recycled water volume information does not meet the expected water volume standards, the backtracking process is initiated, generating a first backtracking instruction. This instruction is used to initiate the water volume backtracking process across all nodes, identifying and analyzing the causes of water volume deviations. Based on the first backtracking instruction, the system performs backtracking of water volume data for each node in the entire water treatment process (including drainage tanks, thickening tanks, ultrafiltration membrane treatment units, biological activated carbon filters, etc.). This process includes checking the inflow and outflow of each tank, the operation of flow regulation equipment, and the accuracy and precision of the data acquisition system. Through backtracking analysis, the system generates water volume backtracking results. These results record the water balance status of each node in detail and indicate possible water volume losses or sources of error.

[0048] Furthermore, calculating the overall water loss based on the water volume backtracking results can include the difference between the actual measured recovered water volume and the theoretically calculated expected water volume. The calculation formula typically considers factors such as flow meter accuracy, equipment failure rate, and pipeline leakage.

[0049] If the water loss is less than the preset loss threshold (i.e., the acceptable water volume error range set by the system), the water volume deviation is considered to be within a controllable range. When the water loss is less than the preset loss threshold, the system updates the expected water volume standard, generating a new expected water volume update standard. This standard takes into account the actual water loss during operation to better reflect the actual situation. The generated expected water volume update standard is applied to the current water volume judgment process to ensure that the system can more accurately monitor and control water volume. Finally, the recovered water volume information is compared with the new expected water volume update standard. If the comparison result shows that the recovered water volume information meets the new standard, the water volume is considered to be up to standard. When both the water quality and the updated water volume standard meet expectations, the system generates an extraction command to initiate the reclaimed water extraction operation of the tailwater recovery tank, ensuring efficient water resource utilization and stable system operation.

[0050] In one possible implementation, step A570 further includes step A575: if the recovered water quality information does not meet the expected water quality standard, but the recovered water volume information meets the expected water volume standard, then a second backtracking instruction is generated; step A576 is executed, the analysis unit is activated through the second backtracking instruction, and the analysis unit performs water quality analysis on the supernatant of the tailwater recovery tank based on the analysis unit, generating water quality analysis results; step A577 is executed, the drainage tank, thickening tank, and biological activated carbon filter are matched according to the water quality analysis results to determine the target tank; step A578 is executed, the supernatant of the tailwater recovery tank is backtracked to the target tank for iterative processing until the recovered water quality information meets the expected water quality standard, and the extraction instruction is generated.

[0051] First, the system determines whether the recovered water quality information conforms to the expected water quality standards. If the recovered water quality information does not conform to the standards, but the recovered water volume information conforms to expectations, the system enters the water quality backtracking process, generating a second backtracking instruction under the above conditions. This instruction is used to activate the analysis unit to conduct in-depth water quality analysis and determine the target pool requiring iterative treatment. The analysis unit, which includes advanced data analysis tools and algorithms, is activated by the second backtracking instruction to perform detailed analysis of the water quality of the supernatant in the effluent recovery tank. The analysis unit first extracts a supernatant sample from the effluent recovery tank and monitors and collects detailed water quality data in real time. This data includes, but is not limited to, key indicators such as turbidity, COD, BOD, pH value, dissolved oxygen, and total dissolved solids (TDS).

[0052] Further analysis units delve into the collected water quality data, identifying specific pollutant types and concentration levels, and pinpointing potential causes of substandard water quality. Based on the analysis results, the system generates a water quality analysis report, detailing the deviations between the actual values ​​and expected standards for each water quality indicator. This data provides a basis for subsequent target pool matching and iterative treatment. The system, based on the water quality analysis results, traverses the drainage tank, thickening tank, and biological activated carbon filter to find the most suitable treatment unit and determine the target pool. Based on the determined target pool, the supernatant from the effluent recovery tank is returned to that target pool. This means the supernatant is reintroduced into the target pool for reprocessing to address previously detected water quality issues. The supernatant undergoes further treatment in the target pool, such as biodegradation, oxidation, and adsorption, until the water quality meets the expected standards. Iterative processing refers to repeatedly cycling the process until the water quality meets the expected requirements. After each iteration, the system reactivates the analysis unit to analyze the water quality of the treated supernatant and generate new water quality analysis results. If the new water quality analysis results show that the supernatant water quality meets the expected standards, the iterative processing stops and proceeds to the next step. If the water quality still does not meet the standards, the iteration continues until the standards are met. When the recovered water quality information meets the expected water quality standards and the recovered water volume information still meets the expected water volume standards after iterative processing, the system generates an extraction command to ensure the efficient use of water resources and the stable operation of the system.

[0053] This application addresses the technical problem that traditional methods of discharging supernatant from thickeners and sludge dewatering liquid externally pose safety and health risks to the sludge dewatering liquid and prevent its direct reuse. It effectively solves the problems of difficulty in reusing supernatant from thickeners and sludge dewatering liquid, and the lack of suitable external discharge routes, thereby ensuring the safe and stable reuse of sludge discharge water from water supply plants and achieving the technical effect of "zero discharge" operation and management goals for water supply plants.

[0054] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Those skilled in the art should understand that various modifications, combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application. In some cases, the actions or steps described in this application can be performed in a different order than that shown in the embodiments and still achieve the desired results. Furthermore, the processes depicted in the accompanying drawings do not necessarily require a specific or sequential order to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

Claims

1. A method for controlling the reuse of supernatant from a thickener based on dissolved air flotation modification technology for drainage tanks, characterized in that, The method includes: Multi-source water body datasets are obtained by receiving water from multiple sources through drainage ponds in the target area. The multi-source water body dataset was preliminarily processed using air flotation modification technology to generate multiple water body treatment data. Based on the multiple water body treatment data, the supernatant of the concentration tank is extracted, and the supernatant of the concentration tank is subjected to ultrafiltration membrane treatment to generate ultrafiltration membrane treatment results. Based on the ultrafiltration membrane treatment results, the third supernatant is placed in the tailwater recovery tank; The wastewater recovery tank is used for balanced regulation, and the supernatant is intelligently reused based on the regulation results. Based on the ultrafiltration membrane treatment results, the third supernatant is placed before the effluent recovery tank. The method includes: Flocculants were used to dewater the supernatant from the thickener after ultrafiltration membrane treatment, resulting in sludge-water separation. A dewatering liquid conditioning tank is constructed, and the dewatering liquid is processed in combination with the mud-water separation results to generate dewatering conditioning results. The dehydration adjustment results were analyzed to determine the dehydration liquid and bottom sediment. The dehydrated liquid is purified using an ultrafiltration membrane treatment process to generate a first supernatant and backwash water; The bottom sludge is transferred to a sludge balancing tank for adjustment. Based on the sludge adjustment results, the sludge is dewatered to generate a second supernatant, backwash water, and sludge cake. The backwash water is fed into a drainage tank, the sludge cake is transported off-site, and the first supernatant and the second supernatant are fed into a biological activated carbon filter for treatment. The third supernatant is generated based on the treatment results. The method for balancing and regulating the wastewater based on the aforementioned tailwater recovery tank includes: The effluent from the drainage tank, the effluent from the ultrafiltration membrane of the supernatant of the thickening tank, and the effluent from the biological activated carbon filter are collected in a unified manner to generate an effluent dataset, which includes water quality information and water quantity information. The third supernatant is homogenized by combining the water quality information with the tailwater recycling tank to generate first adjustment information. The third supernatant is adjusted by combining the tailwater recovery tank with the water volume information to generate second adjustment information; Add the first adjustment information and the second adjustment information to the adjustment result; Intelligent reuse control of supernatant based on adjustment results includes the following methods: Based on the adjustment results, extract the water quality and water volume information of the wastewater recovery tank; Based on the first adjustment information, it is determined whether the recovered water quality information meets the expected water quality standard; based on the second adjustment information, it is determined whether the recovered water volume information meets the expected water volume standard. If the recycled water quality information meets the expected water quality standard and the recycled water volume information meets the expected water volume standard, an extraction command is generated. Based on the extraction command, the tailwater recycling tank is extracted to obtain recycled water, which is then transported to the distribution well for storage. If the recovered water quality information meets the expected water quality standard, but the recovered water volume information does not meet the expected water volume standard, then a first backtracking instruction is generated; The first backtracking instruction is used to backtrack the water volume of all nodes and generate the water volume backtracking result. Based on the water volume backtracking results, the loss of the recovered water volume information is calculated. When the water volume loss is less than the preset loss threshold, the expected water volume standard is updated, and an updated expected water volume standard is generated. The recovered water volume information is compared with the expected water volume update standard. When the recovered water volume information meets the expected water volume standard, the extraction instruction is generated. If the recovered water quality information does not meet the expected water quality standard, but the recovered water volume information meets the expected water volume standard, then a second backtracking instruction is generated. The analysis unit is activated by the second backtracking command, and water quality analysis is performed on the supernatant of the tailwater recovery tank based on the analysis unit to generate water quality analysis results; Based on the water quality analysis results, the target pool is determined by matching the drainage pool, thickening pool, and biological activated carbon filter. The supernatant from the tailwater recovery tank is iteratively processed back to the target tank until the recovered water quality meets the expected water quality standard, at which point the extraction command is generated.

2. The method for controlling the reuse of supernatant from a thickener based on the air flotation modification technology of a drainage tank as described in claim 1, characterized in that, Inputting the backwash water into the drainage tank includes transporting the backwash water treated by the ultrafiltration membrane to the drainage tank and storing it together with the remaining backwash wastewater in the drainage tank for conditioning and flotation treatment.

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