48 results about "Activated sludge system" patented technology

The invention relates to the technical field of wastewater treatment, in particular to a regulation and control method and system for an activated sludge process and electronic equipment. The method comprises the following steps: acquiring activated sludge property evaluation information; matching the activated sludge property evaluation information with data in an activity standard database of biochemical sludge; and implementing negative feedback optimization of the working condition of the activated sludge system on the activated sludge property evaluation information which is unqualified in matching with the activity standard database of the biochemical sludge. According to the regulation and control method of the activated sludge process, stable and reliable operation of the activated sludge process is achieved according to the constructed activity standard database of biochemical sludge, parameters such as system regulation and control logic and signal intensity of the method are subjected to mass data adjustment and calibration, self-adaptive regulation and control are achieved based on real-time monitoring results, timeliness is higher, and the method is suitable for popularization and application. The actual operation condition can continuously tend to an ideal condition point, the system unbalance risk is remarkably reduced, and the labor cost is greatly reduced.

The invention discloses a sewage treatment process for organic wastewater, and belongs to the field of sewage treatment.The sewage treatment process comprises the following steps that S1, wastewater containing nitrogen-containing organic phosphonic acid metal complexes is pumped into a dielectric barrier discharge reactor, and P-C bond energy is reduced through high-energy electron bombardment; s2, adding a modified layered metal hydroxide containing interlayer co-intercalation carbon quantum dots and persulfate and a composite oxidant of aspergillus niger immobilized microspheres into the wastewater subjected to plasma treatment; s3, deeply adsorbing heavy metal ions in the wastewater subjected to composite oxidation treatment in a gradient magnetic field by utilizing a magnetic layered metal hydroxide material; s4, the wastewater subjected to magnetic adsorption sequentially passes through an anaerobic ammonia oxidation coupling reactor and an aerobic biological membrane-activated sludge system to degrade pollutants; s5, dephosphorizing the wastewater subjected to biological treatment by algae by adopting a layered immobilized phycomycete symbiotic system; and S6, tail end magnetic recovery and effluent disinfection. The invention aims to solve the problems of low decomplexing efficiency and halfway decomplexing in the prior art.

The purpose of the present invention is to achieve an ozone water concentration estimation device which is capable of monitoring ozone water concentration with a simpler configuration than before even if impurities are present in ozone water. This ozone water concentration estimation device comprises a first data acquisition unit, an estimation unit, and a data output unit. The first data acquisition unit acquires first generation environment data including at least one of the ozone gas concentration of an ozone gas that is supplied to the inside of an ozone water generation tower, the ozone gas flow rate of the ozone gas, the water temperature of the ozone water that is retained in the ozone water generation tower, the pH of the ozone water, and the retention amount of the ozone water. The estimation unit estimates, from the first generation environment data, an ozone water concentration estimate value, which is an estimated value of the ozone water concentration in the ozone water at the time of measurement of the first generation environment data input from the first data acquisition unit, using a numerical model that estimates the ozone water concentration, which is the concentration of ozone dissolved in the ozone water at the time of measurement of the first generation environment data. The data output unit outputs the ozone water concentration estimate value.

Disclosed is a method for predicting aeration quantity required to maintain a stable dissolved oxygen concentration in an activated sludge system, including measuring operating parameters of a biochemical tank of a wastewater treatment plant at intervals of a t1 time period over a certain period of time; replacing the DO concentration data with DO concentration data after a t2 time period from the time of measurement; filtering the DO concentration data after being replaced to form a dataset; building a random forest model, and building a machine learning matrix using data in the dataset to train the random forest model; evaluating prediction performance of the trained random forest model; and using the trained random forest model to predict an aeration airflow rate required to achieve the target DO concentration value after the t2 time period, thereby adjusting an aeration airflow rate.

The invention relates to the technical field of water treatment, and discloses a sludge quality-divided reflux type aerobic-anoxic sulfur autotrophic activated sludge denitrification process. The process comprises the following steps: wastewater enters a sectional type aerobic tank, the wastewater enters the sectional type aerobic tank, organic matters are removed in a strengthened manner in a first section of aerobic tank, part of ammonia nitrogen is converted into nitrite nitrogen and nitrate nitrogen, and nitrification is strengthened in a second section of aerobic tank, so that the ammonia nitrogen is deeply removed; effluent of the sectional type aerobic tank enters an anoxic tank and is completely mixed with sulfur particles and activated sludge for sulfur autotrophic denitrification; effluent of the anoxic tank enters a secondary sedimentation tank for sedimentation, supernate is discharged, and bottom mud enters a hydrocyclone to be divided into heavy sludge and light sludge; the heavy sludge flows back to the front end of the anoxic tank, the light sludge flows back to the front end of the sectional aerobic tank, and the remaining sludge is discharged. According to the invention, sulfur autotrophic denitrification is deeply integrated into an activated sludge system, so that high-efficiency nitrogen removal without carbon source and internal reflux is realized.

The invention relates to the technical field of environment monitoring and automatic control, in particular to a sewage early warning and treatment analysis system based on deep learning. Comprising a data acquisition module used for acquiring multi-dimensional real-time data of an activated sludge system of an urban sewage treatment plant and constructing a time sequence characteristic data set; the first processing module is used for outputting a dynamic weight coefficient through deep learning model training and reasoning based on the time sequence characteristic data set; the second processing module is used for calculating a critical index representing the system risk in real time by combining the multi-dimensional real-time data, the dynamic weight coefficient and a preset parameter reference value; the early warning judgment module is used for comparing the critical index with a preset early warning threshold value and judging the risk level of the system; and the intervention decision module is used for responding to the risk level judged by the early warning judgment module and generating and executing a hierarchical intervention strategy. According to the system, accurate prediction of the viscous collapse critical state is realized.

An A H C R -A 2 O sewage treatment system, comprising: an anaerobic tank, a biological adsorption hydrolysis-clarification and redistribution tank, an anoxic tank, an aerobic tank and a secondary sedimentation tank. A new biological adsorption hydrolysis-clarification and redistribution tank is provided. After the sewage is mixed with the external reflux sludge, pollutants are rapidly adsorbed and partially hydrolyzed, and settle to the bottom of the tank body, and the supernatant is collected in the upper part of the tank body. The supernatant outlet is respectively connected to the anoxic tank and the aerobic tank and selectively conducted, and the bottom sludge outlet is connected to the anoxic tank. In the sewage treatment method: according to the preset value of the supernatant turbidity, it is selected to flow into the aerobic tank or the anoxic tank, and the bottom sludge is introduced into the anoxic tank. The present invention can improve the nitrogen and phosphorus removal efficiency of a single activated sludge system, improve the utilization rate of the internal carbon source in sewage, reduce the consumption of the external carbon source. When the influent COD / TN≈5, the effluent TN≤10mg / L, the external carbon source does not need to be added, the tank volume is reduced by more than 10%, and it is applicable to the upgrading transformation of the high discharge standard of sewage treatment plants, realizing the functions of improving quality, increasing efficiency and reducing consumption.

The application discloses a method for efficiently removing sulfonamide antibiotics by flocculent sludge domestication, and belongs to the technical field of sewage treatment. The method greatly improves the removal rate of sulfonamide antibiotics by adjusting the culture conditions of activated sludge in a traditional activated sludge system. The method can effectively remove antibiotics, has the characteristics of simple operation, low treatment cost and large-scale operation, and the removal of pollutants is mainly realized by sludge adsorption and microbial degradation. The important functional bacteria, nitrifying bacteria, in the activated sludge treatment process can improve the removal efficiency of antibiotics including antibiotic drugs through co-metabolism while completing nitrification, so that the functional bacteria can be enriched by inoculating activated sludge and domesticating the sludge into flocculent form, and the functional bacteria are used to efficiently remove sulfonamide antibiotics.

A powdered activated carbon (PAC) enhanced activated sludge system for removing PFAS from a flow of wastewater and / or landfill leachate includes at least one bioreactor including biomass to receive the flow wastewater and / or landfill leachate and to promote growth of biological flocs and an impregnation subsystem which receives a flow of biomass and / or settled biomass and a predetermined amount PAC and blends the biomass and / or the settled biomass with the PAC to form PAC-impregnated biological flocs. The at least one impregnation system outputs a flow of PAC-impregnated biological flocs to the bioreactor such that the PAC-impregnated biological flocs in the bioreactor adsorb to and remove a majority of the PFAS from the flow of wastewater and / or landfill leachate and the bioreactor outputs a flow of PAC-impregnated biological flocs having a majority of the PFAS adsorbed thereto and wastewater and / or landfill leachate having a majority of the PFAS removed. The system also includes at least one secondary clarifier coupled to the bioreactor which separates the PAC-impregnated biological flocs having a majority of the PFAS adsorbed thereto from the wastewater and / or landfill leachate having a majority of the PFAS removed and produces a flow the treated wastewater and / or landfill leachate having a majority of the PFAS removed.

The utility model relates to the technical field of wastewater treatment, in particular to an activated sludge system. The system comprises: a pretreatment tank; the primary sedimentation tank is communicated with the pretreatment tank through a first conveying pipeline; the aeration tank is internally provided with activated sludge, and the aeration tank is communicated with the primary sedimentation tank through a second conveying pipeline; a first sampler is arranged on the aeration tank; the secondary sedimentation tank is communicated with the aeration tank through a third conveying pipeline; the bottom of the secondary sedimentation tank is communicated with the bottom of the aeration tank through a backflow pipeline, so that part of sludge flows back to the aeration tank; a second sampler is arranged on the secondary sedimentation tank; the oxygen supply device is used for supplying oxygen to the aeration tank; the control device performs the following control: after the first sampler acquires the activated sludge sample of the aeration tank for a preset time, the second sampler acquires an effluent sample of the secondary sedimentation tank; the preset time is the time when the wastewater flows from the sampling point of the first sampler to the sampling point of the second sampler. The system provided by the utility model can synchronously obtain the matched conditions in the pool.

A granular activated carbon (GAC) reactivation waste product enhanced activated sludge system for removing PFAS from a flow of wastewater and / or landfill includes at least one bioreactor including biomass to receive the feed water and to promote growth of biological flocs, and an impregnation subsystem to receive a flow of biomass and a predetermined amount of GAC reactivation waste product and to blend the biomass with the GAC reactivation waste product to form GAC reactivation waste product-impregnated biological flocs. The impregnation subsystem outputs a flow of GAC reactivation waste product-impregnated biological flocs to the bioreactor such that the GAC reactivation waste product-impregnated biological flocs in the bioreactor adsorb to and remove the PFAS from the treated water, and the bioreactor outputs a flow of GAC reactivation waste product-impregnated biological flocs and treated water. The system also includes at least one secondary clarifier coupled to the bioreactor which separates the GAC reactivation waste product-impregnated biological flocs from the wastewater and / or landfill leachate and produces a flow the treated water.

The present application relates to the field of wastewater treatment, and particularly relates to a method for advanced denitrification of low carbon-nitrogen ratio wastewater based on short-cut nitrification and denitrification and anaerobic ammonia oxidation, which establishes an activated sludge bioaugmentation system by adding biochar immobilized ZB403 strain into an SBR activated sludge system, and domesticates the activated sludge bioaugmentation system by adjusting the component and content of simulated wastewater and optimizing the operation conditions of the bioaugmentation system, and optimizes the biological community structure in the system. The activated sludge bioaugmentation system is used for treating low carbon-nitrogen ratio wastewater, the inorganic nitrogen removal rate is above 99%, the COD removal rate is above 97%, and the sludge yield coefficient Yobs is 0.27-0.29 kgVSS / kgCOD.

The invention provides a sewage treatment method beneficial to sludge reduction, and relates to the field of sewage treatment. The sewage treatment method comprises the following steps: adding graphene subjected to surface hydrophilization modification into an activated sludge system, and intensifying the formation of granular sludge through anaerobic-aerobic alternate operation and hydraulic separation in a sequencing batch reactor. The Raman spectrum ID / IG ratio of the modified graphene is less than or equal to 0.2. According to the present invention, the modified graphene provides the microorganism attachment carrier and the electron transfer channel, and the dynamic precipitation control strategy is combined to achieve the rapid formation of the granular sludge, the improvement of the system treatment efficiency and the significant reduction of the excess sludge, such that the method is suitable for the low-carbon and high-efficiency municipal and industrial sewage treatment.

This invention discloses a method for treating organic wastewater from the production of perovskite photovoltaics, belonging to the field of pollutant treatment technology. The method comprises the following steps: pre-treating the organic wastewater from perovskite photovoltaic production with alkali, followed by anaerobic reaction, then treatment with anoxic / aerobic / microaerobic activated sludge systems, and finally adding flocculants for coagulation and sedimentation, thereby achieving the treatment of the organic wastewater. This method effectively removes pollutants from the organic wastewater, and the treatment process is simple with low operating costs.

This invention discloses a wastewater treatment method using electrostatic field-coupled aerobic nitrification, belonging to the field of wastewater treatment technology. Acclimated sludge, wastewater, and insulating electrodes are added to an aerobic nitrification reactor. A voltage of 0-2 V / cm is applied outside the reactor to form an electrostatic field, controlling the organic load in the wastewater to be 500-4000 mg / L and the ammonia nitrogen concentration to be 100-400 mg / L, thus achieving wastewater treatment. This invention reveals the intrinsic mechanism of an electric field-coupled activated sludge system for treating ammonia nitrogen wastewater, enriching knowledge in the field of microbial electrochemistry, clarifying the influence of various factors on microbial activity and function, providing a new perspective for understanding the role of microorganisms in wastewater treatment, significantly improving ammonia nitrogen wastewater treatment efficiency, reducing pollutant content, reducing environmental pollution, and ensuring water quality and ecological safety; it also reduces aeration-related energy requirements and lowers the cost of ammonia nitrogen wastewater treatment.

The utility model relates to a printing and dyeing wastewater heat energy recycling device, and belongs to the field of wastewater heat energy recycling, the printing and dyeing wastewater heat energy recycling device comprises a wastewater treatment pond, a recycling mechanism is arranged on the inner wall of the left side of the wastewater treatment pond, a drying mechanism is arranged on the right side of the wastewater treatment pond, and the recycling mechanism comprises an evaporator. According to the printing and dyeing wastewater heat energy recycling device, by means of the specific recycling mechanism design and cooperative work of the evaporator, the compressor, the condenser and other assemblies, the efficiency of recycling heat energy from printing and dyeing wastewater is improved, the recycled heat energy can be used for heating air or other media, necessary heat energy is provided for the wastewater treatment process, and the environment is protected. Therefore, the consumption of extra energy is reduced, a more suitable living environment is provided for microorganisms in the activated sludge by reducing the temperature of the wastewater, the biological treatment efficiency and effect of the wastewater are improved, and the negative influence of the high-temperature wastewater on the stability and treatment effect of an activated sludge system is effectively reduced by recovering heat energy.

A granular activated carbon (GAC) reactivation waste product enhanced activated sludge system for removing PFAS from a flow of wastewater and / or landfill includes at least one bioreactor including biomass to receive the flow wastewater and / or landfill leachate and to promote growth of biological flocs and an impregnation subsystem to receive a flow of biomass and a predetermined amount of GAC reactivation waste product and to blend the biomass with the GAC reactivation waste product to form GAC reactivation waste product-impregnated biological flocs. The at least one impregnation subsystem outputs a flow of GAC reactivation waste product-impregnated biological flocs to the bioreactor such that the GAC reactivation waste product-impregnated biological flocs in the bioreactor adsorb to and remove a majority of the PFAS from the flow of wastewater and / or landfill leachate and the bioreactor outputs a flow of GAC reactivation waste product-impregnated biological flocs having a majority of the PFAS adsorbed thereto and wastewater and / or landfill leachate having a majority of the PFAS removed. The system also includes at least one secondary clarifier coupled to the bioreactor which separates the GAC reactivation waste product-impregnated biological flocs having a majority of the PFAS adsorbed thereto from the wastewater and / or landfill leachate having a majority of the PFAS removed and produces a flow the treated wastewater and / or landfill leachate having a majority of the PFAS removed.

The invention discloses a wastewater treatment method by coupling an electrostatic field with aerobic nitrification, and belongs to the technical field of wastewater treatment. Adding the domesticated sludge, wastewater and an insulated electrode into an aerobic nitration reactor, applying voltage outside the aerobic nitration reactor to form a 0-2 V / cm electrostatic field, and controlling the organic load in the wastewater to be 500-4000 mg / L and the ammonia nitrogen concentration to be 100-400 mg / L, so as to realize wastewater treatment. The invention discloses the internal mechanism of the electric field coupled activated sludge system for treating the ammonia-nitrogen wastewater, enriches the knowledge of the microbial electrochemical field, clarifies the influence rule of each factor on the activity and function of microorganisms, provides a new perspective for understanding the action mechanism of the microorganisms in wastewater treatment, and can obviously improve the treatment efficiency of the ammonia-nitrogen wastewater. The pollutant content is reduced, the environmental pollution is reduced, and the water environment quality and ecological safety are guaranteed; the aeration-related energy demand can be reduced, and the ammonia-nitrogen wastewater treatment cost is reduced.

An enhanced activated sludge system for removing PFAS from a flow of wastewater and / or landfill leachate includes at least one bioreactor configured to receive a flow of wastewater and / or landfill leachate and configured to promote growth of biological flocs. The at least one bioreactor mixes the biological flocs with a particulate media to form biological flocs enmeshed with the particulate media which adsorb and remove a majority of the PFAS from the flow of wastewater and / or landfill leachate and outputs a flow of biological flocs enmeshed with the particulate media having the majority of PFAS adsorbed thereto and treated wastewater and / or landfill leachate having a majority of the PFAS removed. A separation subsystem separates the biological flocs enmeshed with the particulate media having the majority of PFAS adsorbed thereto from the treated wastewater and / or landfill leachate and outputs a flow of treated wastewater and / or landfill leachate having a majority of the PFAS removed.

The invention provides a method for evaluating an activated sludge system response mechanism under antibiotic impact and application thereof, and belongs to the technical field of water environment risk evaluation and management. The method mainly relates to detection of water quality indexes (ammonia nitrogen, total nitrogen, total phosphorus and chemical oxygen demand) in the activated sludge and physicochemical characteristics (extracellular polymeric substance EPS, sludge settling performance and Zeta potential) of the activated sludge, and a response mechanism of an activated sludge system under antibiotic impact is analyzed by taking ciprofloxacin (CIP), ofloxacin (OFL) and enrofloxacin (ENR) as indication pollutants. Effective reference is provided for system regulation and control when a sewage plant faces antibiotic impact, and a new insight is provided for removing antibiotics and drug-resistant genes in wastewater by explaining the relation among functional genes, drug-resistant genes and microbial communities in an activated sludge system under antibiotic exposure.

The invention discloses an intelligent phosphorus removal agent adding system and method based on an activated sludge process sewage treatment process, and belongs to the technical field of sewage treatment. A monitoring module, a control module, an adding module, an agent storage module, a process linkage feedback regulation module and a safety protection module are in signal connection and then cooperatively work; the method breaks through the deficiency of the traditional phosphorus removal agent adding technology on process suitability, realizes the synergism of agent adding and sludge reduction by integrating an activated sludge process flow, accurately adding in different areas, constructing double closed-loop feedback and additionally arranging a process abnormality instant response, improves the phosphorus removal effect, reduces agent waste, and simultaneously reduces the cost of the phosphorus removal agent. The stability of the activated sludge system is guaranteed, the operation and maintenance cost is reduced, the effluent quality is ensured to be stable and reach the standard, and meanwhile, the method has good process suitability, compatibility and safety reliability.

The invention relates to a sewage treatment and rainwater collection and purification system for an expressway service area, which mainly comprises two subsystems, namely a sewage treatment system and a rainwater collection and purification system, and the sewage treatment system and the rainwater collection and purification system are converged in a final clean water tank and jointly provide recycled water sources for various water demands of the service area. The sewage treatment system comprises a grating, a grit chamber, a CASS (cyclic activated sludge system) tank, a sewage contact disinfection tank and a clean water tank which are connected in sequence; the CASS tank is connected with a sludge concentration tank; and the sludge in the sludge concentration tank is transported outwards. The rainwater collecting and purifying system comprises a split-flow filtering device, a rainwater storage tank, a rainwater settling tank, a rainwater filtering tank, a rainwater contact disinfecting tank and a clean water tank which are connected in sequence. By means of the system, efficient cyclic utilization of water resources in the expressway service area is achieved, environmental pollution is relieved, the ecological system is protected, and the sustainability of the expressway service area is improved.

The present invention discloses a method for achieving self-oxygenation of an aerobic tank through sludge return, comprising: installing multiple dissolved oxygen monitoring probes along the aerobic tank, extracting sludge from the MBR tank and returning it to multiple outlets along the aerobic tank, each outlet being provided with a sludge return valve for controlling the return flow rate Q, each dissolved oxygen monitoring probe being associated with a sludge return valve located at its front end and closest to it; and adjusting the opening / closing and flow rate Q of each sludge return valve accordingly based on the feedback data of each dissolved oxygen monitoring probe. The method of the present invention can achieve stable control of dissolved oxygen in the aerobic tank and save fan energy consumption through a simple batch return technology, and the effect is very significant. Although the invention is only aimed at the activated sludge + MBR system process, the technology is currently a mainstream sewage treatment process and is widely used. Therefore, the invention patent has great market application prospects.

The application provides a device and method for realizing sludge separation and double-sludge anaerobic ammonia oxidation synchronously, which comprises the following steps: sewage flows into a first anaerobic tank from an original water tank; meanwhile, part of sludge at the bottom of an activated sludge system flows back to the first anaerobic tank; part of sludge-water mixture flows into a second anaerobic tank from the first anaerobic tank, and then flows through a first aerobic tank and a second aerobic tank from the second anaerobic tank in sequence; part of sludge-water mixture flows into an inclined plate separator from the second aerobic tank; sludge separation is realized by an inclined plate in the inclined plate separator; sludge with a particle size greater than a preset value is intercepted above the inclined plate, and sludge with a particle size less than or equal to the preset value passes through the inclined plate and is located below the inclined plate; part of sludge-water mixture above the inclined plate enters the activated sludge system; part of sludge-water mixture below the inclined plate enters a biofilm system; and denitrification is realized by the activated sludge system and the biofilm system respectively.

The present invention discloses a rapid startup method for an autotrophic denitrification process in a biofilter. The method comprises: (1) pre-inoculating activated sludge rich in denitrifying bacteria and sewage to be treated in the biofilter, and then cracking the sludge; (2) loading a carrier for culturing nitrifying bacteria into the cracked sludge of step (1), and carrying out biofilm culture of microorganisms required for the nitrification process; (3) when the ammonia nitrogen removal rate in the culture system of step (2) is more than 50%, loading a carrier for culturing anaerobic ammonia oxidizing bacteria, and carrying out biofilm culture of anaerobic ammonia oxidizing bacteria; (4) when the nitrite nitrogen removal rate in the culture system of step (3) reaches more than 50%, co-culturing of nitrifying bacteria and anaerobic ammonia oxidizing bacteria is carried out until the startup process is completed. The present invention first pre-treats the activated sludge system, and then loads the nitrifying bacteria carrier and the anaerobic ammonia oxidizing bacteria carrier in steps, accelerates the rapid biofilm formation of microorganisms with denitrification function, and realizes the rapid startup of the system.

The invention belongs to the crossing field of a sewage treatment technology and artificial intelligence, and discloses an intelligent early warning method and system for activated sludge settling performance based on multi-modal deep learning. The method comprises the following steps: synchronously acquiring three-dimensional fluorescence spectrum image data and a settling performance index SVI30 of loose extracellular polymeric substances and compact extracellular polymeric substances according to preset nodes in the operation process of an activated sludge system; five types of settlement state labels are divided according to an SVI30 measured value. Standardized preprocessing is performed on the LB / TB-EPS map, the LB / TB-EPS map is input into a ResNet deep convolutional network to extract feature vectors, and meanwhile, after a numerical index is standardized, dimension raising is performed through a three-layer perceptron. And the three groups of feature vectors are spliced, a five-classification full-connection neural network is constructed, five types of state probability distributions are output, and the accuracy rate of a model test set reaches 84.38%. The bottleneck of multi-modal data fusion is broken through, the problem of refined identification of the activated sludge state is solved, and intelligent decision support is provided for sludge settling performance optimization.

The invention belongs to the technical field of random system control and sewage treatment, and discloses a T-S fuzzy Markov jump system control method based on an activated sludge system. According to the method, a nonlinear kinetic model is constructed from key state variables of the system, and the complex biological reaction and substance transfer process in sewage treatment is accurately described. By introducing the Markov jump theory, parameter random jump caused by inlet water quality sudden change and the like is effectively described, and the adaptability and accuracy of the model under the dynamic working condition are enhanced. For possible faults of an actuator (such as a dilution valve and an aerator), a fault model is established and a corresponding fault-tolerant control strategy is designed, so that the reliability and robustness of the system are improved. On the basis of the Lyapunov stability theory, a linear matrix inequality condition which enables the system to be randomly stable under the fault and disturbance and meets the H-infinity performance index is deduced, the effectiveness of the linear matrix inequality condition is verified through strict mathematical derivation, and a theoretical basis is provided for implementation of a controller and stable operation of the system.

The invention belongs to the technical field of sewage treatment, and relates to an activated sludge system gas supply flow control method and application. The specific technical scheme is as follows: (1) in the operation process of the activated sludge sewage treatment system, acquiring the oxygen uptake rate OUR, the dissolved oxygen DO and the temperature T of the activated sludge in an aerobic tank in real time, recording the air supply flow Q, and constructing a training test data set; (2) training an artificial neural network model by taking the oxygen uptake rate OUR, the dissolved oxygen DO and the temperature T as model input and taking the air supply flow Q as model output; and (3) during the operation of the activated sludge sewage treatment system, calculating the corresponding air supply flow Q by using the trained artificial neural network model, and adjusting the actual air supply flow of the aerobic tank of the activated sludge sewage treatment system to the air supply flow Q calculated by the artificial neural network model. The air supply flow is regulated and controlled based on the activated sludge process state, and blindness and hysteresis of air supply flow regulation completely depending on dissolved oxygen (DO) feedback are avoided to a certain extent.

This application discloses an optimization method for regulating the SVI (Sludge Volume Index) of activated sludge based on algae control. The method includes: real-time monitoring of the SVI value in the aerobic activated sludge tank; adding algae at a set ratio to the aerobic activated sludge tank with abnormal SVI values, where abnormal SVI values ​​include both excessively low and excessively high values; for excessively low SVI values ​​(20-60 mL / g), adding algae to maintain the algae concentration in the aerobic tank at 150-250 mg / L to improve the sludge floc structure; for excessively high SVI values ​​(130-200 mL / g), adding algae to maintain the algae concentration in the aerobic tank at 50-150 mg / L to compress the sludge volume. This application achieves targeted regulation and long-term stability of the SVI value within a target range by precisely introducing specific algae into the activated sludge system.

The present disclosure provides a multi stage activated sludge system for biological wastewater treatment, having improved sludge settling properties, the multi stage activated sludge system comprising: an MABR tank comprising an MABR module, an MABR tank aeration unit configured for periodically aerating mixed liquor within the MABR tank, and an outlet from the MABR tank configured for selectively discharging partially settled sludge from the MABR tank, thus selecting for faster settling sludge.