221 results about "Hydraulic retention time" patented technology

The invention discloses a sewage treatment method, system and device based on a neural network model and a medium, and relates to the technical field of sewage treatment.By monitoring water quality parameters such as inflow total phosphorus concentration in real time, neural network model input data are preset to always reflect the current actual working condition instead of prediction based on outdated or fixed data, and the accuracy of sewage treatment is improved. The timeliness and accuracy of dosing amount prediction are ensured, and the hysteresis of traditional off-line detection is eliminated to realize real-time regulation and control. A plurality of treatment schemes are obtained by generating different combinations of dissolved gas amount and hydraulic retention time, each treatment scheme corresponds to different minimum dosage, and on the premise of ensuring that the sewage treatment effect meets the effluent total phosphorus concentration limit value, the treatment scheme corresponding to the minimum sewage treatment cost is taken as a target scheme, so that the sewage treatment efficiency is improved. According to the decision-making mode based on cost optimization, the most economical operation scheme can be selected from a plurality of feasible schemes, so that the sewage treatment cost is effectively reduced on the premise that the total phosphorus concentration requirement of effluent is met.

The invention relates to the field of wastewater treatment, and discloses a method for treating nitrogen-containing wastewater based on sulfur autotrophic DNRA and anaerobic ammonia oxidation, which comprises the following steps: firstly, introducing nitrogen-containing wastewater into an Anammox reactor, inoculating granular sludge taken from a secondary sedimentation tank of a sewage treatment plant into the Anammox reactor, carrying out anaerobic ammonia oxidation reaction, controlling hydraulic retention time, and carrying out anaerobic ammonia oxidation treatment on the sludge; the method comprises the following steps: pumping effluent and sulfur source inlet water into an sDNRA reactor together, inoculating ordered batch sDNRA sludge into the sDNRA reactor, performing DNRA action under sulfide driving in a stirring state, and controlling hydraulic retention time to realize automatic effluent. According to the method disclosed by the invention, a carbon source does not need to be added, byproducts generated along with complex carbon metabolism can be effectively reduced, the cost can be effectively reduced while secondary pollution is avoided, the total nitrogen removal rate of the system can be successfully improved, and the generation of greenhouse gas N2O is reduced.

The invention relates to the technical field of water quality detection, and discloses a water supply network water quality abnormity tracing method and system based on data fusion, and the method comprises the steps: carrying out the time alignment of water quality parameter data of distributed monitoring points in a water supply network, and obtaining a standardized water quality parameter sequence; according to the measurement precision of the parameters in the standardized water quality parameter sequence, distributing the weight coefficient of the parameters, and according to the hydraulic retention time in the water supply network, correcting the weight coefficient to obtain a correction coefficient of the water quality parameter data; performing weighted fusion on the standardized water quality parameter sequence based on the correction coefficient to obtain a fusion feature vector; constructing a node connection relation matrix according to the topological structure data of the fusion feature vector; performing anomaly tracing on the fusion feature vector according to the node connection relation matrix to obtain an anomaly result; a pollution source in the water supply network is positioned according to the abnormal result, and a water quality early warning signal is generated; the accuracy of water quality abnormity tracing can be improved.

The invention discloses a sewage plant water quality prediction and management operation method, a computer program product and an electronic product, and belongs to the technical field of water quality prediction.The method comprises the steps that a water quality prediction model is constructed, the water quality prediction model comprises a GeoMAN model and a time sequence model which are cascaded, and the GeoMAN model comprises an HRT dislocation compensation module; the dynamic alignment module is used for carrying out dynamic alignment treatment on the effluent quality data of each treatment unit according to the actual hydraulic retention time of each process section treatment unit; and after training the water quality prediction model, performing water quality prediction based on the real-time data, and outputting a water quality prediction result. The spatial features of the data are captured through the GeoMAN model, and the time features of the data are captured through the time sequence model, so that the spatial and time complexity of the water quality data and the process control parameter data is comprehensively understood, and the water quality prediction precision is improved. And the HRT dislocation compensation module is used for carrying out time alignment treatment on the effluent quality data of the treatment units in different process sections, so that the accuracy of water quality prediction can be further improved.

The invention discloses a biological denitrification device and a denitrification method for sewage with a low carbon-nitrogen ratio. The denitrification device comprises a raw water tank, a bioreactor and a secondary sedimentation tank which are connected in sequence, wherein the bioreactor sequentially comprises an anaerobic zone, a swing zone, an anoxic zone and an aerobic zone; the swing area is provided with four stages of reaction tanks which are arranged in a split mode, and the dissolved oxygen concentration and the hydraulic retention time of each stage of reaction tank are adjusted based on the inflow water quality. When the system disclosed by the invention is used for treating sewage with a low carbon-nitrogen ratio, an exogenous carbon source does not need to be added through a specific technological process, so that the operation cost of the system is remarkably reduced, and efficient biological phosphorus removal can be realized while the nitrogen removal efficiency is remarkably improved.

The invention provides a comprehensive control method and equipment for the dosage of a water purification system, a medium and a product, and relates to the technical field of water purification. The method comprises the following steps: acquiring water quality parameters and a hydraulic model corresponding to sewage, and predicting target water quality parameters and hydraulic retention time corresponding to an inlet and an outlet corresponding to a magnetic coagulation module according to the water quality parameters and the hydraulic model; generating an agent adding reference curve and an agent adding correction curve according to the target water quality parameters and preset indexes, wherein the preset indexes comprise a discharge index and a standard index; and controlling the dosing amount of the dosing pump according to the chemical dosing reference curve, the chemical dosing correction curve and the water quality parameters. According to the embodiment of the invention, the dosage can be automatically adjusted according to actual water quality parameters, effective matching of the dosage and the phosphorus content of the sewage is realized, medicament consumption is reduced, the labor cost and medicament cost required by sewage purification are reduced, and the demand of accurately controlling the dosage is effectively met.

The present invention relates to the field of urban sewage treatment, and particularly relates to an urban sewage carbon-nitrogen-phosphorus synergistic deep treatment method based on a biological manganese oxide. The method comprises: S1, configuring an upward flow denitrification filter tank; S2, a starting stage, involving: taking a mixed solution of a secondary effluent and a secondary influent of an actual urban sewage treatment plant and manganese sulfate as the influent of the denitrification filter tank, with the manganese concentration being 3.0 mg / L, inoculating hydrolytic acidification bacteria, denitrifying bacteria, anaerobic ammonium oxidation bacteria and manganese oxidation bacteria into the denitrification filter tank, and gradually increasing the ratio value of the secondary influent to the secondary effluent in the mixed solution to 3%; and S3, a stable stage, involving: taking a mixed solution of the secondary effluent and the secondary influent of the actual urban sewage treatment plant and manganese sulfate as the influent of the denitrification filter tank, wherein the manganese concentration is 3.0 mg / L, the hydraulic retention time is 3-4 hours, and the backwashing period is 9-11 days. The present invention can synchronously and efficiently remove carbon, nitrogen and phosphorus from the secondary effluent of an actual urban sewage treatment plant at a low cost.

The invention relates to the technical field of water supply control, and discloses an intelligent quality-based pressure-superposed non-negative pressure water supply control system and method, and the system comprises a data collection control module, a volume identification module, a water age observation module, a mixing decision module, and an impedance verification module. The effective volume parameters of the steady flow compensation tank are inversed through the pressure response characteristics of the variable frequency booster pump set in the starting stage; dynamically calculating the hydraulic retention time in the tank based on the system flow and the effective volume; when the residence time exceeds a safety threshold value, a forced mixing strategy is generated, and municipal inlet water is driven to be mixed with residence water by adjusting the opening degree of a bypass electric adjusting valve and controlling a pump set to operate; and meanwhile, verifying the effectiveness of the mechanical action of the valve according to the deviation between the real-time power and the theoretical reference power of the pump set after the regulation instruction is issued. Volume parameters can be corrected in real time, aged water is actively replaced under the low-flow working condition, closed-loop verification is carried out on faults of an executing mechanism, and the water supply quality and the system reliability are guaranteed.

The invention relates to the technical field of industrial production wastewater treatment, and particularly discloses a treatment method of POSM production wastewater. The treatment method provided by the invention specifically comprises the following steps: carrying out pretreatment to convert heavy metal ions into precipitates, and carrying out mild oxidation on ultra-filtered clear liquid; carrying out wet catalytic oxidation; electrolytic oxidation is carried out under the condition that the current density is 1-10 A / dm < 2 >, and the hydraulic retention time is 10-60 min; the microcrystal material is filled through targeted adsorption, the liquid overflowing speed is 0.2-1 BV / H, and the adsorption temperature is 20-35 DEG C; the wastewater enters an MVR forced circulation system for evaporation, is sent to a forced circulation heat exchanger by a crystallization separator through a forced circulation pump and then returns to the crystallization separator; and performing pyrolysis coupling. The POSM wastewater is treated by adopting the scheme, mother liquor is not left, effluent COD (Chemical Oxygen Demand) is low and stable, condensate water and salt resources can be recycled, resource reutilization is realized, and the treatment cost is reduced.

The invention discloses a preparation method and application of a nano-modified micro-electrolysis filler based on a self-regeneration technology, and belongs to the technical field of water pollution treatment. The method comprises the steps of iron-carbon matrix pretreatment, nano material loading, self-regeneration functional layer coating, filler forming, high-temperature activation and the like, it is ensured that the filler has efficient and stable reaction performance, the filler is filled according to the volume ratio of 30%, the hydraulic retention time is controlled to be 2-4 h, the removal rates of COD, ammonia nitrogen, total phosphorus and heavy metal ions can reach 90%, 85%, 80% and 95% or above respectively, and the method is suitable for industrial production. In the running process of the filler, a weak acid solution with the pH value of 5 is introduced every 30 days, and the self-regeneration function is activated. By optimizing the material modification and self-regeneration mechanism, the problems that a traditional micro-electrolysis filler is prone to passivation, high in decontamination capability attenuation speed and high in maintenance cost are solved, and the micro-electrolysis filler is suitable for lake entrance ecological interception engineering under the complex water quality condition and has the advantages of being efficient, stable and environmentally friendly.

The invention provides a sewage enhanced nitrogen and phosphorus removal process based on microbial community interaction, and belongs to the field of sewage treatment. The method comprises the steps of sewage pretreatment, anaerobic phosphorus release, anoxic denitrification, aerobic nitrification phosphorus uptake and the like, an anaerobic-anoxic-aerobic three-section reactor is adopted, and proper ecological nichs are provided for phosphorus-accumulating bacteria, denitrifying bacteria and nitrifying bacteria by accurately regulating and controlling parameters such as dissolved oxygen, hydraulic retention time and carbon nitrogen ratio of each section, so that the phosphorus-accumulating bacteria, the denitrifying bacteria and the nitrifying bacteria can be efficiently degraded, and the phosphorus-accumulating bacteria, the denitrifying bacteria and the nitrifying bacteria can be efficiently degraded. The competition problem of biological nitrogen removal and biological phosphorus removal is effectively relieved, the nitrogen and phosphorus removal efficiency is remarkably improved, the total nitrogen removal rate reaches 85% or above, and the total phosphorus removal rate exceeds 90%; straw-based modified charcoal is adopted as a carrier, so that the loading capacity and activity of functional flora are improved, and flora interaction is enhanced; meanwhile, resource utilization of agricultural wastes is realized, and the method has remarkable environmental benefits and economic advantages.

The invention discloses an efficient three-grid septic tank treatment device based on partial nitrosation and a feces treatment method. The treatment device comprises a stabilizing chamber, an anaerobic chamber, a partial nitrosation chamber and a settling chamber which are sequentially connected, a feeding pipeline is arranged at the upper part of the stabilizing chamber, a septic tank cover plate is arranged at a top opening, a preformed hole is formed in the septic tank cover plate, and the stabilizing chamber is communicated with the anaerobic chamber through a middle pipeline passage; a fixed polyurethane sponge filler is arranged in the anaerobic chamber, another septic tank cover plate is arranged at a top opening, and the upper part of the anaerobic chamber is communicated with the partial nitrosation chamber through a pipeline passage; another septic tank cover plate is arranged at the top of the partial nitrosation chamber, an aeration system is arranged in the septic tank cover plate, and a movable spherical filler is filled in the septic tank cover plate; the bottom of the partial nitrosation chamber is communicated with the settling chamber through a middle passage; a sediment sludge storage hopper is arranged at the bottom of the sediment chamber; a liquid outlet is formed in the upper part of the sediment chamber. The treatment efficiency and the manure utilization rate are remarkably improved, and the hydraulic retention time is shortened.

The invention discloses a carrier type anaerobic sequencing batch reactor suitable for anaerobic digestion treatment of sludge and a treatment method. The anaerobic sequencing batch reactor comprises a tank body, a stirrer, a biogas water-sealed tank, a temperature adjusting module, a bottom sludge inlet valve, a scum valve, an overflow sludge discharge valve, a bottom sludge discharge valve, a circulating sludge path and carrier adding equipment, the carrier recovery device comprises a magnetic adsorption recovery device, the output end of the overflow sludge discharge valve and the output end of the bottom mud discharge valve are connected with the input end of the magnetic adsorption recovery device, the reactor can enrich microorganisms by adding the magnetic carrier, the settleability of the sludge can be improved by formed anaerobic granular sludge, and the magnetic carrier can be recycled. The device is simple in structure, realizes shorter sludge hydraulic retention time and longer sludge retention time, and is matched with carrier recovery equipment to recover carriers in discharged sludge and enable the carriers to flow back to the reactor, so that loss of the carriers is avoided.

The invention discloses a sewage advanced treatment and activated carbon regeneration method. The method comprises the following steps: (1) filling activated carbon according to 30-70% of the effective volume of a reactor; (2) carrying out wall breaking treatment on the residual activated sludge, releasing substances in cells, precipitating or filtering to remove impurities, keeping the liquid on the upper surface, adding the liquid into the reactor in the step (1), carrying out braising exposure treatment for 12-24 hours, and controlling the concentration of dissolved oxygen to be more than 5mg / L; (3) adding a nitrogen and phosphorus removal bacterial agent into a reaction system in the step (2), carrying out continuous aeration treatment, and then carrying out sewage treatment according to set hydraulic retention time; in the sewage treatment process, regular rotational flow treatment is performed on the activated carbon to regenerate the activated carbon. According to the method disclosed by the invention, dynamic biological regeneration of the activated carbon part can be realized, the service cycle of the activated carbon is further prolonged, and synchronous deep removal of organic pollutants and nitrogen-containing pollutants is realized.

The invention discloses a method for hydrolyzing dimethylformamide and recovering dimethylamine, which comprises the following steps: mixing dimethylformamide wastewater with alkali liquor, and adjusting the pH value of the wastewater to 11.5-12 to obtain adjusted wastewater; heating the adjusted wastewater to 70-80 DEG C, and carrying out hydrolysis reaction to obtain hydrolyzed wastewater, wherein the hydraulic retention time is 3-4 hours; carrying out steam stripping deamination on the hydrolyzed wastewater to obtain steam containing dimethylamine and deaminated wastewater; the steam containing dimethylamine is subjected to condensation and gas-liquid separation, gas-phase dimethylamine and condensate are obtained, and the condensate flows back to the steam stripping amine removal step; the gas-phase dimethylamine is absorbed by a low-temperature absorption liquid to obtain a dimethylamine aqueous solution product, and tail gas generated in the absorption process is purified. According to the method, the residual concentration of DMF can be reduced to be extremely low (1t: 15 mg / L), the biotoxicity is effectively relieved, and good conditions are created for subsequent anaerobic and aerobic biochemical treatment of wastewater.

This invention discloses a startup method for an AnDMBR dynamic membrane for sludge anaerobic digestion. During the startup phase, by adjusting the solids retention time, hydraulic retention time, biogas circulation intensity, and membrane flux in the membrane zone, the sludge operating concentration is rapidly increased and the dynamic membrane layer is rapidly formed, so that the transmembrane pressure difference in the membrane zone reaches the expected value in a short time, thereby improving the production efficiency of the reactor.

The present application provides a method for preparing modified magnetic particles and a method for continuous demulsification of the modified magnetic particles, including: adding vinyltrimethoxysilane to absolute ethanol and stirring to obtain solution A; adding perfluorooctanoic acid and sodium hydroxide to absolute ethanol and stirring to obtain solution B; adding magnetic particles to the mixed solution of solution A and solution B, transferring it to a reaction kettle, placing it at 80-90 °C and keeping warm for 0.5-2 h, cooling, and drying to obtain modified magnetic particles; applying the modified magnetic particles to the method of turbulent dispersion continuous demulsification, pumping the emulsion into a stirring tank through a peristaltic pump to mix with M-MMPs, and the hydraulic retention time in the stirring tank is greater than or equal to 30 s; controlling the surface magnetic field intensity of the electromagnet above 400 Gs, the height of the separation chamber is less than 5 cm, the hydraulic retention time of the emulsion in the separation chamber is greater than 30 s, and collecting the separated oil and water; preventing the modified magnetic particles from gradually adhering to the wall surface of the separation chamber to achieve the optimal separation effect.

The invention relates to the technical field of wastewater treatment, and discloses a chemical wastewater treatment system, which is characterized in that an adjusting tank is used for introducing chemical wastewater, adjusting the pH of the wastewater through a pH regulator, and adding suspended solids to obtain pretreated wastewater; the anaerobic reaction tank is used for introducing the pretreated wastewater, adding an anaerobic bacterium agent, carrying out biogas backflow aeration stirring, and regulating and controlling the biogas backflow flow and the stirring intensity in real time through a fuzzy PID algorithm; the aerobic reaction tank is used for introducing anaerobic effluent, adding an aerobic microbial agent, predicting the degradation-resistant COD (Chemical Oxygen Demand) concentration of the effluent by adopting an LSTM (Long Short Term Memory) model, and if a predicted value is greater than 50mg / L, prolonging the hydraulic retention time by 0.5-1h or increasing the dosage of the microbial agent; the hydrogen incinerator is used for heating anaerobic reaction inlet water to 30-35 DEG C through the heat exchanger; the post-treatment unit is used for discharging or recycling aerobic effluent after the aerobic effluent is subjected to membrane filtration and disinfection and reaches the standard; the degradation-resistant COD (Chemical Oxygen Demand) standard-reaching rate of effluent is improved.

The invention discloses a mine water recharge pretreatment device which comprises a supporting plate, the outer side of the top of the supporting plate is sleeved with a shell, one side of the top of the shell is fixedly connected with a supporting frame, one side of the supporting frame is fixedly connected with a box body, and the center axis of the top of the box body is fixedly connected with a first motor; and the output end of the first motor is fixedly connected with a first stirring roller. Through the staged stirring design and the rapid mixing stage, a flocculating agent is in full contact with mine water, charge neutralization is completed, flocs are promoted to collide and agglomerate into large and dense flocs in the slow flocculation stage, the flocs are prevented from being damaged by strong turbulence, and the flocculation effect is improved; secondly, the multi-shell design is matched with switching of the flow guide pipes, materials can be processed in parallel, the hydraulic retention time is flexibly adjusted, and the processing efficiency is improved; water and sediments are separated through a mechanical structure after sedimentation, operation is convenient, the sediments are treated in a centralized mode, the occupied area of the device is small, and the space utilization rate is high.

The present invention discloses a space-intensive flocculation water treatment device, comprising a sedimentation separation mechanism and a spiral coil wound around the outer side thereof. The sedimentation separation mechanism comprises a first outer cone, a first inner cone disposed within the sedimentation separation mechanism, and multiple layers of sedimentation cone plates disposed between the first inner cone and the first outer cone. One end of the spiral coil is provided with a sewage inlet, and the other end is disposed within the first inner cone. A conical plate separation zone is formed between the first outer cone and the first inner cone, and a clear water zone is formed above the conical plate separation zone. The present invention can make greater use of the space of the equipment, achieve a higher sewage treatment capacity per unit volume of the equipment, quickly form larger and dense flocs, achieve high separation efficiency between the flocs and the water body, and reduce the hydraulic retention time by more than 50% compared to traditional flocculation devices, thereby improving the flocculation treatment speed and efficiency. The device is suitable for various sewage treatments, saves space, improves efficiency, and is suitable for sewage treatment projects with limited space.

The present invention provides a sulfur autotrophic denitrification method without sulfide emissions, relating to the field of wastewater biological treatment technology. The method comprises the following steps: adding a reducing sulfur source in a sulfur autotrophic denitrification reactor, inoculating activated sludge, acclimation, and entering the early sulfur-type autotrophic denitrification stage; controlling the reaction pH to be 6.5-8.0, and the hydraulic retention time to be 1-12h, the reducing sulfur source is converted into sludge surface or internal biological sulfur; the biological sulfur concentration in the sludge reaches 12-23mg S / g SS, stops adding the reducing sulfur source, and enters the autonomous autotrophic denitrification stage; controlling the reaction pH to be 6.9-8.0, and the hydraulic retention time to be 3-23h, realizes efficient denitrification. The method does not require an external sulfur source and can withstand different nitrogen concentrations; it is necessary to add organic matter, reduce denitrification operating costs, and realize efficient autotrophic denitrification; no sulfide is produced, reducing environmental hazards.

The invention relates to the technical field of data processing, and discloses a ditch ecological restoration benefit evaluation method and system. The method comprises the following steps: inputting a ditch pollution source tracking data set into a ditch pollution transmission simulation algorithm, and calculating a ditch purification capability coefficient through ditch hydraulic retention time and a pollutant degradation rate to obtain a ditch self-purification efficiency matrix; a ditch bearing capacity comparison model before and after restoration is established according to the ditch self-purification efficiency matrix, the restoration gain proportion is calculated and determined through the ditch containing threshold value difference, and a ditch capacity improvement vector is obtained; and carrying out space coupling operation on the channel capacity improvement vector and a village-in-city building density distribution factor to generate a regional channel restoration contribution index, and obtaining a channel restoration efficiency quantification result. According to the method, the problem that environmental feature pertinence and quantitative analysis means are lacked in village-in-city ditch restoration benefit evaluation is solved, and the accuracy of restoration benefit evaluation is improved.

This invention discloses a gate-controlled canal system and method for simulating the transport process of new pollutants, comprising an experimental chamber, a multi-stage gate control unit, and an environmental control and monitoring unit. The experimental chamber has multiple fixed partitions inside, forming water flow channels between adjacent partitions, allowing experimental water to circulate repeatedly along these channels. The multi-stage gate control unit includes multiple adjustable flow gates located inside the experimental chamber, dividing the water flow channels into multiple study zones. The environmental control and monitoring unit includes an automatic controller, a hydrodynamic propulsion device, a temperature control device, an aeration device, a lighting device, and an online water quality monitoring device. This invention achieves accurate simulation of the core characteristics of gate-controlled canals, such as multi-stage gate regulation, stepped water levels, and variable hydraulic residence time, providing a key experimental means for studying the migration and transformation behavior of new pollutants under complex hydraulic conditions.

This invention discloses an application device and method for high-efficiency, anti-fouling MBR membrane modules in wastewater treatment. The MBR tank of this device employs special materials and structural design, resulting in a reasonable hydraulic retention time. The MBR membrane module is made of modified PVDF, with precisely controlled membrane pore size and reinforced ribs and a unique encapsulation structure. Combined with an aeration device featuring a central aeration nozzle, it effectively solves problems such as membrane breakage, entanglement, and aeration dead zones. It is also equipped with comprehensive supporting equipment, and automated operation and precise control are achieved through an online monitoring and control system. The application method covers steps including biological wastewater treatment, membrane filtration, air scrubbing, backwashing, and chemical cleaning, and maintenance and optimization are performed based on water quality and equipment conditions. This invention significantly improves wastewater treatment efficiency and water quality stability, reduces membrane fouling and operating costs, extends membrane module lifespan, is highly adaptable, and offers intelligent and simple operation, providing an innovative and efficient solution for wastewater treatment.

The present application relates to a method and system for calculating the distribution of residual chlorine in a clear water tank, and belongs to the field of drinking water chlorination disinfection technology. First, a residual chlorine decay curve of the water sample is fitted, and then the clear water tank is grid processed using fluid mechanics simulation software to establish a clear water tank inflow and outflow prediction model. The inflow and outflow of the clear water tank in a certain period of time is predicted using the clear water tank inflow and outflow prediction model, and the flow distribution of each grid inside the clear water tank is simulated using fluid mechanics simulation software. The hydraulic retention time of each grid unit and the total cumulative hydraulic retention time from the inlet of the clear water tank to each grid unit along the horizontal direction of the water flow are calculated, the residual chlorine concentration of the chlorinated raw water passing through each grid of the clear water tank is calculated through the residual chlorine decay curve, and the residual chlorine concentration of each grid unit is updated in real time by setting a time step. The present application can accurately predict and manage the residual chlorine distribution from the inlet to the outlet of the clear water tank, thereby ensuring water quality safety and providing a basis for improving the efficiency of disinfectant use.

The modular ecological net flow channel structure comprises a land area buffer area, an ecological net flow channel and a water level variable amplitude area, a net flow channel division bin is arranged in the ecological net flow channel, a water collecting hole is formed in the upper portion of a water inlet area of the ecological net flow channel, the water inlet area is communicated with the net flow channel division bin through a bottom water passing hole, and the water inlet area is communicated with the water level variable amplitude area. A ceramsite purification layer is filled in the net flow channel division bin, and a top overflow port is formed in the upper part of the outer side of the net flow channel division bin. Modularized ecological flow purification ditch structures are added into a land area buffer area and a water level variable amplitude area of a river and lake ecological buffer zone, the hydraulic retention time of sewage in the buffer zone is prolonged, and the problem that runoff pollution cannot be effectively intercepted and purified due to the fact that the width of the buffer zone is insufficient can be solved; the method ensures that the runoff is effectively slowed down and dispersed before entering the lake, is an effective water environment treatment technology, and is of great significance for protecting the lake water quality and maintaining the river ecosystem.

The present application relates to the field of expressway service area wastewater treatment, and particularly relates to a kind of expressway service area wastewater treatment method based on anaerobic ammonia oxidation enhanced AOOA-MBBR.Method includes: first, preparation reactor;Second, start reactor and inoculate bacteria, in this step, after the preset time of effluent stable operation, hydraulic retention time is gradually shortened to 20h;Third, anaerobic ammonia oxidation enhancement: after the preset time of effluent stable operation, using the packing of biofilm anaerobic ammonia oxidation bacteria replaces part of the packing in each pool;The dissolved oxygen concentration in the first aerobic tank is 0.2mg / L, the dissolved oxygen concentration in the second aerobic tank is 0.5-0.8mg / L;Part of the expressway service area wastewater is directly pumped into the second anoxic tank after adding manganese sulfate;Fourth, after the effluent is stable, enter the stable stage.The present application can make the total nitrogen and total phosphorus of effluent reach the corresponding discharge standard when the hydraulic retention time is 20h, thereby improving the expressway service area wastewater treatment efficiency, and avoiding the subsequent phosphorus removal problem.

The invention relates to a discharge port biological filter system which comprises an inner ring gabion, the area of the inner ring gabion is determined according to the average daily displacement of a discharge port and the hydraulic retention time of 4 hours; the outer ring overflow weir adopts a triangular overflow weir, graded broken stones are filled in the outer ring overflow weir, and sandy soil is selected for 30cm of the surface layer; the biological matrix is located in the inner ring gabion, the biological matrix comprises volcanic rock, paddy basketry rock and biological ceramsite, and the porosity of the biological matrix is larger than or equal to 40%; the hygrophytes are emergent aquatic plants, and varieties with stain resistance and developed root systems are selected. According to the discharge port biological filter system provided by the invention, through the inner ring gabion and the outer ring overflow weir, the tail end treatment of the rain and sewage mixed discharge port is realized, and the quality of water entering a lake is greatly improved.

The invention discloses an autotrophic and heterotrophic synergistic denitrification method, and relates to the technical field of sewage treatment.The method comprises the steps that an autotrophic denitrifying bacterium and heterotrophic denitrifying bacterium symbiotic micro-ecological environment is built in the same reactor, the autotrophic denitrifying bacterium conducts denitrification with inorganic carbon as a carbon source and a reducing sulfur compound as an electron donor, and the heterotrophic denitrifying bacterium conducts denitrification with the inorganic carbon as a carbon source and the reducing sulfur compound as an electron donor; the heterotrophic denitrifying bacteria perform denitrification by taking an organic carbon source as an electron donor and a carbon source. By controlling the water inlet condition, the dissolved oxygen concentration, the pH value, the water temperature and the hydraulic retention time, two denitrification ways are synergistically carried out in the same reactor, so that the total nitrogen removal efficiency is improved, the addition amount of an external organic carbon source is reduced, and the sludge yield is reduced. The method is suitable for deep denitrification treatment of secondary effluent of municipal sewage treatment plants and nitrogen-containing wastewater such as coal chemical industry wastewater, petrochemical industry wastewater, printing and dyeing wastewater, food processing wastewater and aquaculture wastewater.

The present application relates to a method for realizing anaerobic ammonia oxidation bacteria enrichment under the joint regulation of NLR and HRT in the field of sewage biological treatment technology, which aims at the problems of anaerobic ammonia oxidation bacteria being greatly affected by the environment and slow enrichment, etc. + -N and NO2 ‑ -N is pumped into the SBR reactor, and the enrichment of anaerobic ammonia oxidation bacteria is successfully realized by continuously changing the hydraulic retention time and the substrate concentration of the influent. The total nitrogen removal rate is stably maintained at 75%, which has good removal efficiency, and the flexible regulation of the reactor is beneficial to the rapid start of the anaerobic ammonia oxidation reactor, providing a theoretical reference for the practical application of the Anammox process. It is simple to operate, easy to manage, has high treatment efficiency, and has good popularization and application prospect.