686 results about "Leachate" patented technology

The invention relates to the technical field of environmental engineering water treatment automatic control, and discloses a landfill leachate treatment control method based on cooperative control. The method comprises the following steps: acquiring real-time monitored water quality parameter data streams including a pretreatment stage pH value, a main treatment stage COD concentration, a deep treatment stage membrane pressure difference and the like in a landfill leachate treatment system, inputting the data streams into a cooperative control framework, and dynamically correcting PID controller parameters through a nonlinear gain function to generate a primary adjustment instruction; evaluating and generating a strategy optimization instruction based on the reinforcement learning strategy network; inputting the two into a grey prediction model and outputting a cooperative control signal containing a feedforward compensation amount; and finally, dynamically adjusting the coagulant dosage, the aeration intensity and the working pressure of the membrane component according to the signal to form a closed-loop control loop. The method can master the water quality change in real time, accurately regulate and control the treatment process, improve the stability and reliability of the treatment system, and effectively improve the landfill leachate treatment effect.

The invention discloses application of sodium tetraphenylborate in carbon sourcing of landfill leachate and a carbon sourcing method and device. According to the invention, sodium tetraphenylborate is used as an ammonia nitrogen removing agent and is added into the percolate sewage of the organic garbage, so that the carbon nitrogen ratio of supernatant liquid is increased, and then the supernatant liquid is used as a carbon source. The basic principle that sodium tetraphenylborate is subjected to a precipitation reaction with ammonia ions in an aqueous solution is utilized, then standing separation is selected according to precipitation properties, and discharged water can be stored as a carbon source or directly added into a water treatment process in the form of the carbon source. The precipitate is collected and dehydrated, the precipitate can be recycled as a precipitant after being heated and recovered by alkali liquor, and the released concentrated ammonia gas is collected and can be used for industrial production. The method has the advantages of high reaction efficiency, low interference degree, high controllability of carbon-nitrogen ratio, recyclable main reagents, low theoretical operation cost, obvious removal effect on chroma of sewage, and high industrial value of discharged carbon-sourced water.

The invention discloses a dynamic leaching-spectrophotometric detection method for the release rate of nutrients in a slow-release fertilizer, and relates to the field of agrochemical analys.The detection method comprises the following steps that S1, a slow-release fertilizer sample is placed in a leaching column to be leached, and leachate is collected; s2, sequentially adding a masking agent solution and a chromogenic reagent into the leachate, and carrying out chromogenic reaction; s3, pumping the solution into a double-optical-path flow cell, and measuring absorbance values under a target nutrient characteristic absorption wavelength and a background interference characteristic wavelength; s4, calculating the corrected net absorbance; and S5, calculating the nutrient concentration, and drawing a nutrient release kinetic curve. By adopting a dual-wavelength synchronous detection and real-time dynamic subtraction correction algorithm, the method can eliminate system errors of time-varying background chromaticity, so that accurate and reliable absorbance readings can be obtained at the initial stage of nutrient release even if the nutrient concentration in the leachate is very low, thereby ensuring the authenticity of the initial stage of a release curve and improving the accuracy of nutrient release. And initial release kinetic parameters are accurately captured.

The utility model belongs to the technical field of wastewater treatment, and relates to a leachate concentrated solution atomization drying device, which comprises a drying tower, a first-stage closed-up opening, a straight-barrel-shaped lower tower body and a second-stage closed-up opening, which are arranged from top to bottom, and a flue gas outlet pipe is arranged at the lower part of the lower tower body; the rotary atomizer is arranged in the center of the top of the drying tower and is used for atomizing the leachate concentrated solution into atomized liquid drops; the rotational flow gas inlet channel is arranged on the outer side of the rotary atomizer and used for uniformly guiding the high-temperature flue gas into the drying tower and making contact with the atomized liquid drops; the pressure relief device is arranged on the top surface of the drying tower and is used for automatically relieving pressure to ensure safety; the first-stage closing opening and the second-stage closing opening are each of an inverted hollow circular truncated cone structure. The height of the lower tower body is larger than that of the upper tower body, and the diameter of the upper tower body is larger than that of the lower tower body. Through rotational flow air inlet and the unique drying tower structure design, the treatment efficiency and the equipment performance are remarkably improved.

The invention discloses a landfill leakage detection method and system based on a boundary double-voltage electric field, and the method comprises the steps: building an artificial electric field which covers the whole area of a landfill along a boundary measuring line electrode at the periphery of the landfill based on the high-resistance characteristic of an impermeable film and the conductive characteristic of leachate, and collecting the boundary potential and electric field data through the high and low double-voltage artificial electric field, the method comprises the following steps: constructing a boundary survey line data pair of physical alignment through differential denoising and normalization preprocessing, adopting an encoder-decoder architecture based on 1D-CNN, fusing spatial transformation and a Focal Loss loss function, directly learning a mapping relation between a boundary survey line potential anomaly mode and an internal leakage position, and outputting a leakage probability distribution diagram of a corresponding landfill contour. The method does not need to excavate and pre-embed the landfill pile body, the positioning precision reaches + / -2m, the single detection time consumption is less than or equal to 4h, the comprehensive cost is reduced by 70%, the electrode reuse rate is greater than or equal to 90%, the method is suitable for landfill sites with various shapes and various stages, and efficient, accurate and low-cost detection of the leakage area is realized.

The invention relates to the field of landfill leachate treatment, and discloses a landfill leachate treatment equipment management method and system based on big data, and the method comprises the steps: collecting the operation parameters of landfill leachate treatment equipment and the water quality parameters in the treatment process in real time; extracting multi-dimensional features based on the operation parameters and the water quality parameters; inputting the multi-dimensional features into a trend prediction model; the trend prediction model outputs a short-term prediction result of the water quality parameters; on the basis of the short-term prediction result, the current operation parameters and the current operation type of the equipment, technological parameter adjustment suggestions are output through a control strategy model trained by a reinforcement learning algorithm, and a control strategy is generated; and the control strategy is sent to an equipment controller, and the equipment controller regulates and controls the corresponding processing equipment based on the control strategy. By means of the technical scheme, short-term prediction of the water quality parameters of the landfill leachate is achieved, and the predictability of the treatment process is improved.

The invention provides a method for synchronously recovering iron and rare earth from iron separation tailings, which comprises the following steps of: roasting the pretreated iron separation tailings in a graphite crucible to obtain a roasted product; the roasted product is crushed and screened, oversize products and undersize products are obtained, and the oversize products are reduced iron products; the screen underflow and an acid solution are mixed for leaching, and leaching liquid containing rare earth elements and acid leaching residues are obtained; and adding a precipitant into the leachate to obtain a precipitate containing rare earth elements, and recovering fluorite concentrate from the acid leaching residues. According to the method, the traditional disjunction mode of pre-enrichment and then smelting is broken through, a roasting-acid leaching integrated process with deep beneficiation and smelting coupling is provided, the complex pre-enrichment link is abandoned, efficient and synchronous recovery of iron and rare earth is achieved, and the method has the advantages of being short in process, low in energy consumption, few in flotation reagent, high in rare earth recovery rate, high in resource comprehensive utilization rate and the like.

The invention relates to the technical field of landfill leachate treatment, in particular to landfill leachate treatment equipment and method.The landfill leachate treatment equipment comprises an anaerobic tank and a water distribution pipe, and the water distribution pipe is arranged at the bottom in the anaerobic tank; the device further comprises a recovery device, an oxidation treatment device, a flocculation treatment device, a filtering device, a flow guide table, a flow guide inclined plate, two groups of circulating boxes and heat exchange pipes, the flow guide table and the flow guide inclined plate are respectively arranged at the upper part in the anaerobic tank, the two groups of circulating boxes are respectively mounted on two sides of the outer side wall of the anaerobic tank, and the plurality of groups of heat exchange pipes penetrate through the anaerobic tank and are communicated with the two groups of circulating boxes; the recovery device is communicated with the anaerobic tank and the two groups of circulating boxes, is used for recovering biogas generated in the anaerobic tank, and is used for heating the reaction temperature in the anaerobic tank by utilizing the biogas; ozone generated by the system can be conveniently combusted and heated, the medium-temperature anaerobic condition is achieved, the better anaerobic treatment effect is achieved, heating energy consumption is reduced, the degradation capacity of microorganisms to pollutants is enhanced, and the overall treatment effect is improved.

The invention discloses a percolate treatment process multi-parameter intelligent regulation and control and energy consumption optimization system, and relates to the field of data processing, and the percolate treatment process multi-parameter intelligent regulation and control and energy consumption optimization system comprises the following steps: collecting whole-process water quality, equipment operation and energy consumption data, and preprocessing to form a standardized data set; a working condition evaluation module is utilized to analyze the current operation state, and future working condition changes are predicted based on an LSTM model; the multi-objective optimization module generates an optimal regulation and control strategy by combining process requirements and energy consumption objectives, and drives an execution mechanism to adjust operation parameters; the energy consumption monitoring module tracks the energy consumption of each unit in real time, and the remote monitoring platform realizes whole-process data display and management; and accumulating operation data through the self-learning module, and optimizing model parameters by using a reinforcement learning algorithm. The method has the advantages that multi-target cooperative regulation and control of water quality standard reaching and energy consumption optimization are realized through full-process multi-parameter accurate perception and intelligent pre-judgment, remote shortcut operation and maintenance and self-learning iteration capabilities are integrated, and long-term high-efficiency low-consumption operation of leachate treatment is guaranteed.

The invention relates to the technical field of stirring transmission, in particular to a spiral stirring transmission device of a high-precision landfill leachate evaporative crystallization kettle, which comprises an evaporation kettle, a top cover is fixedly mounted at the top of the evaporation kettle, a main shaft is rotatably connected to the axis of the top cover, a sun gear is fixedly connected to the bottom end of the main shaft, and an inner gear ring is fixedly connected to the interior of the top cover. A rotating plate is arranged at the bottoms of the sun gear and the inner gear ring, the rotating plate is rotationally connected to the interior of the top cover, a plurality of connecting shafts are rotationally connected to the rotating plate in the circumferential direction, planetary gears are fixedly connected to the top ends of the connecting shafts, and the planetary gears are meshed with the sun gear and the inner gear ring; according to the invention, the plurality of spiral blades revolve and rotate in the evaporation kettle, so that the stirring range of the landfill leachate is enlarged, layering and sedimentation of the landfill leachate are reduced through reciprocating lifting of the spiral blades in the rotation process, and the evaporative crystallization effect of the landfill leachate is improved.

1. The name of the design product: biogas torch (premixed type). 2. The use of the design product: for processing biogas generated in the production process of sewage treatment plants, waste treatment plants, farms, chemical plants, etc.; biogas generated by anaerobic fermentation in the sewage treatment of pharmaceutical factories, distilleries, paper mills, kitchen waste treatment, landfill leachate, food factories, beverage factories, etc. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1. 5. The top surface of the design product is not easily visible or invisible during use, and the bottom view is omitted. The bottom surface of the design product is not easily visible or invisible during use, and the top view is omitted.

The invention discloses feeding and discharging equipment for high-purity manganese sulfate production, and belongs to the technical field of manganese sulfate production. The equipment aims at solving the problems that in existing high-purity manganese sulfate production, pyrolusite conveying is not uniform, the granularity is not uniform, the sulfuric acid filling efficiency and the leachate output efficiency are low, and potential safety hazards exist. The equipment comprises a base, an electric heating mixing and stirring box body, a spiral conveying mechanism and a feeding and discharging mechanism, the spiral conveying mechanism achieves automatic conveying and crushing of pyrolusite, the feeding and discharging mechanism achieves automatic filling of sulfuric acid and automatic output of leachate, and the equipment avoids material stacking through a homogenizing ring, a dispersing and homogenizing frame and a conical homogenizing disc. And the ventilation pipe and the electromagnetic valve are used for avoiding air pressure interference, the cleaning box body facilitates impurity cleaning, the automation rate of manganese sulfate production can be effectively improved, the production efficiency of manganese sulfate can be further improved, and stable operation of equipment is guaranteed.

The invention relates to the field of soil pollution remediation, and discloses a remediation device for soil heavy metal pollution remediation and a using method thereof.The remediation device for soil heavy metal pollution remediation comprises an acid mist absorption tower which is arranged on the top face of the ground; a purifying assembly, a crushing assembly, a screening assembly, a humidifying assembly, a transferring assembly, a stirring assembly and a protecting assembly are arranged on the ground. According to the remediation method for soil heavy metal pollution remediation, pollution in soil is effectively detoxified through screening and crushing, reduction reaction, deacidification, neutralization reaction, dehydration and re-burying, the original pollution in a soil leachate is larger than or equal to 2000 mg / kg, the total chromium content is larger than or equal to 10000 mg / kg and is reduced to be smaller than or equal to 3 mg / L, the total chromium content is smaller than or equal to 9 mg / L, Ni is smaller than or equal to 50 mg / L, meanwhile, the pH ranges from 6 to 9, and the remediation effect is good. And acid mist generated in the reduction reaction process can be pumped into the acid mist absorption tower by the anti-corrosion induced draft fan, is neutralized by alkali in the acid mist absorption tower, and is discharged after reaching the discharge standard through the discharge pipe.

The invention provides a treatment method and device for intelligently and comprehensively utilizing solid waste of a thermal power plant, and relates to the technical field of resource utilization of the solid waste of the thermal power plant, and the method comprises the steps that a multi-mode sensor array detects the particle size, components and magnetic characteristics of the solid waste in real time, and slag, fly ash and desulfurized gypsum are classified through a machine learning model; constructing a virtual model by means of digital twinning, optimizing a melting temperature parameter through deep reinforcement learning, uploading monitoring data to a cloud end through edge calculation, and triggering process adaptive adjustment; iron elements are recycled by a wet high-gradient magnetic separator, copper and aluminum metals are extracted by smelting reduction of non-magnetic slag, and a composite building material is prepared from residues or 5-25mm inert slag is used as a road base; rare metals such as vanadium, titanium and nickel are extracted from residual slag through acid leaching, leaching liquid is subjected to solvent extraction or ion exchange enrichment, processing data are stored through a block chain, and traceability of the whole life cycle is achieved. The comprehensive resource utilization rate of the solid waste of the thermal power plant is remarkably improved, and meanwhile the overall treatment energy consumption is reduced.

The invention discloses a method for removing heavy metals in sludge, and belongs to the field of environmental protection technology and solid waste recycling. The method comprises the following steps: adding a bioleaching bacteria solution and a nutritive salt solution into dewatered sludge, and adjusting the pH value to form mixed slurry; applying an asymmetric alternating-current electric field to the mixed slurry to perform biological-electrochemical coupling treatment, and performing solid-liquid separation on the treated slurry to respectively obtain purified sludge and leachate containing heavy metals. By utilizing polarization inhibition and oscillation mass transfer effects of the asymmetric alternating-current electric field, the removal efficiency of the bioleaching on the heavy metals in the sludge, especially the organic combined state and residual state heavy metals, is remarkably enhanced, and the method has the outstanding advantages of short treatment period, low energy consumption, no electrode polarization and high heavy metal removal rate.

The subject invention provides safe, environmentally-friendly compositions and efficient methods for extracting impurities from gold ore. More specifically, the subject invention provides compositions derived from microorganisms for pre-leaching treatments of gold ore, which can be used for reducing carbonaceous material in gold ore.

The application discloses a kind of multilayer dialysis device and use method for separating landfill leachate, belong to landfill leachate processing technical field, multilayer dialysis device includes magnetic stirring module and multilayer dialysis module;Magnetic stirring module includes magnetic stirring rotor and the magnetic field control device of driving magnetic stirring rotor rotation;Multilayer dialysis module includes the experimental cylinder being set on stirring table, and multiple different diameters and coaxially arranged dialysis cylinders are arranged in experimental cylinder, and magnetic stirring rotor is arranged at the bottom of the smallest diameter dialysis cylinder;By setting multiple dialysis cylinders with different molecular weight cut-off in multilayer dialysis module, and setting magnetic stirring rotor at the bottom of the smallest diameter dialysis cylinder, not only can simultaneously process the dialysis work of multiple molecular weight organic matter and ionic landfill leachate, but also significantly improve the separation efficiency of multiple molecular weight organic matter and ions with magnetic stirring rotor, compared with single membrane technology, more separation tasks can be completed in shorter time.

The application discloses a semi-closed valley type dangerous waste flexible landfill site, a base, a slope and a garbage dam are enclosed to form a semi-closed valley type landfill site area, and the landfill site further comprises a roof, middle columns, side columns, an anti-seepage system, a leachate collection and drainage system and a groundwater drainage system; the roof is used for stopping rain on the upper part of the landfill site area; the middle columns are located in the landfill site area and used for supporting the roof; the side columns are located at the periphery of the landfill site and form an enclosure structure; the anti-seepage system is divided into a base anti-seepage system used for base anti-seepage, a slope anti-seepage system used for slope anti-seepage and a middle column anti-seepage system used for middle column anti-seepage; the leachate collection and drainage system is inserted in the base anti-seepage system and used for collecting and draining leachate; and the groundwater drainage system is located below the base anti-seepage system and used for draining groundwater. The application can greatly reduce leachate generation and effectively solve the problems of high leachate treatment operation cost and environmental pollution.

The invention provides a liquid crystal pollutant underground water detection system based on fluorescence tracing, and relates to the technical field of underground water environment monitoring and pollution prevention and control. According to the system, three types of core structures BAs, CBAs and FBAs of the LCMs serve as targets, a specific fluorescent probe is designed, a water sample is accurately obtained through an underground water in-situ sampling module, and after fluorescence signal amplification and anti-interference processing are conducted, LCMs type recognition and concentration quantification are achieved in combination with a machine learning algorithm. The core innovation lies in the structural adaptive design of the targeted fluorescent probe, the underground water quality anti-interference technology, engineering in-situ detection integration and multi-component synchronous analysis. Practice verification shows that the detection limit of the system to BAs, CBAs and FBAs LCMs is as low as 0.01-0.05 ng / L, the response time is less than or equal to 30 min, the turbidity resistance and ion interference resistance are high, the system is adaptive to engineering scenes such as in-well monitoring and leachate tracing, rapid screening and dynamic tracking of underground water LCMs pollution can be realized, and engineering technical support is provided for underground water pollution prevention, control and restoration.

The application discloses a phosphorus recovery method and system in phosphogypsum leachate, and relates to the technical field of environmental protection. The phosphorus recovery method comprises the following steps: adding calcium oxide into the phosphogypsum leachate, adjusting the pH value to 4, removing filter residues, removing COD through sand filtration and ultrafiltration; adjusting the pH value of the ultrafiltrate to 4, producing water through first nanofiltration, adjusting the pH value of the permeate to 10, collecting reaction generated gas into a second sedimentation tank for dissolution, continuously producing water through second nanofiltration, and obtaining concentrated water as phosphorus recovery liquid; collecting the first nanofiltration concentrated water and the second nanofiltration permeate, adding phosphate into the second sedimentation tank to obtain magnesium ammonium phosphate precipitation, and performing reverse osmosis treatment on the filtrate. The phosphorus recovery method provided by the application is simple in operation, low in cost, and can make the phosphorus recovery rate reach more than 90%, has a high removal rate of impurities such as F and S, and the obtained products in the treatment process can be recycled, and have high economic value.

This utility model discloses an integrated device for treating leachate from a waste transfer station, comprising a pretreatment unit, a biochemical unit, and a sludge treatment unit. The pretreatment unit includes a wastewater collection tank, a homogenization tank, and a dissolved air flotation (DAF) tank. The biochemical unit includes an anaerobic preparation tank, an anaerobic reactor, a two-stage AO reactor, and a secondary sedimentation tank. The sludge treatment unit includes a sludge storage tank and a screw press dewatering machine. The wastewater collection tank, homogenization tank, DAF tank, anaerobic preparation tank, anaerobic reactor, two-stage AO reactor, secondary sedimentation tank, sludge storage tank, and screw press dewatering machine are sequentially connected via pipelines. This utility model achieves full-volume treatment of leachate from waste transfer stations, and has advantages such as significant treatment effect, no secondary pollution, low operating cost, low energy consumption, and saving land area.

The utility model discloses a garbage pool leachate pollution discharge system and garbage pool structure relates to garbage pool technical field, wherein, the grating plate can be located at the pollution discharge hole department of garbage pool, and the both sides of grating plate along its thickness direction are inside and outside respectively, and grating plate is equipped with a plurality of through the installation hole of inside and outside, a plurality of cleaning devices are correspondingly set up with a plurality of installation holes respectively, and the cleaning device includes sleeve, screw rod and the folding frame of parallelogram, the sleeve extends along the thickness direction of grating plate, and is worn in the installation hole department, the screw rod is worn and is connected in the sleeve with screw thread, and the folding frame is located at the inside of grating plate, and one end of folding frame is located on the sleeve, and the opposite end is located on the screw rod, and the screw rod can rotate and retract relative to the sleeve to drive the folding frame to fold or unfold, and the one end of screw rod away from folding frame is equipped with drive connecting portion, and drive connecting portion is located at the outside of grating plate. The utility model can effectively solve the situation of silting up, guarantee the smooth pollution discharge, and low cost.

This invention discloses a method for recovering rare earth elements from industrial solid waste fluorogypsum, belonging to the field of industrial solid waste treatment technology. The technical solution includes the following steps: 1) Pretreatment of solid waste fluorogypsum: fluorogypsum is screened, crushed, and then fed into a raw material tank; 2) Leaching of rare earth elements: ammonium sulfate solution is added to the raw material tank for soaking, followed by solid-liquid separation to obtain leachate and water-leached residue. The water-leached residue undergoes secondary solid-liquid separation to obtain waste residue and filtrate one; 3) Separation of precipitates containing rare earth elements: a precipitant is added to the leachate for reaction to obtain mixed slurry one. Mixed slurry one undergoes solid-liquid separation to obtain precipitates containing rare earth elements and filtrate two; 4) Filtrate recycling: filtrate one and filtrate two are mixed to obtain a mixed solution, which is then treated with water and recycled. This invention uses a milder ammonium sulfate solution to treat waste fluorogypsum fine powder, greatly saving production costs while avoiding toxic gas emissions and air pollution problems.

The invention discloses a method for producing cuprous oxide by utilizing low-grade purified copper slag in a zinc hydrometallurgy process, and belongs to the technical field of purified copper slag. The invention relates to a method for producing cuprous oxide by utilizing low-grade purified copper slag in a zinc hydrometallurgy process. The method mainly comprises the following steps: acid leaching and impurity removal; the pre-leached filter residues are mixed with dilute sulphuric acid, air is introduced to serve as an oxidizing agent for oxidation leaching, after leaching, the pH is adjusted to 4.0-5.0 through CaCO3, and copper-containing leaching liquid is obtained through filtering; adding dextrose monohydrate into the copper-containing leachate, and adjusting the pH value by using NaOH; according to the method, through the closed-loop process of acid presoaking impurity removal, air oxidation leaching, glucose reduction and cuprous oxide Cl <-> removal, conversion from harmless treatment to resource high-value utilization of the low-grade copper slag is achieved, air is used for replacing KMnO4, MnO2 and other chemical oxidants, the cost is reduced, no harmful by-product exists, the green metallurgy requirement is met, and the method is suitable for industrial production. The prepared cuprous oxide is directly used for removing Cl <-> from a supernatant in electrolytic zinc, and the double contradiction of copper slag dilution and high cost of a Cl <-> removing agent in the industry is solved.

The invention discloses a landfill leachate multi-stage efficient interception, filtration and separation device, and relates to the field of sewage filtration, the landfill leachate multi-stage efficient interception, filtration and separation device specifically comprises an active carbon filter and a quartz sand filter, the active carbon filter is located below the quartz sand filter, and the input end of the active carbon filter is communicated with the output end of the quartz sand filter through a connecting pipe; through precise cooperative regulation and control of the air cylinder and the sealing plug, scientific control of the flow direction of a cleaning agent is achieved, flexible soaking and vortex scouring are conducted on a reverse osmosis membrane, precise and harmless cleaning of scaling is achieved, membrane holes are guaranteed to be through, the service life of a membrane body is prolonged, back washing of a quartz sand filter is completed through synchronous linkage, and the service life of the reverse osmosis membrane is prolonged. Blockage pain points are solved from the source, integrated cleaning of the double-core component can be completed without disassembly, the operation and maintenance process is simplified, the treatment efficiency is improved, and efficient support is provided for harmless and resourceful treatment of the landfill leachate.

The utility model discloses a multi-stage cyclone desanding device, and relates to sand-water separation equipment, in particular to kitchen waste, kitchen waste leachate and sewage treatment equipment. The multi-stage cyclone desanding device is composed of four parts, namely a front cyclone desander, a middle cyclone desander, a sand storage hopper, a heating buffer tank, a rear cyclone desander, a sand lifting screw conveyor, a pump valve and a pipeline. The multi-stage cyclone desanding device is of a fully-closed structure, integrates heating hydrolysis and cyclone desanding, does not generate sewage splashing and flowing, and has the advantages of being simple in structure, convenient to operate, safe and reliable. The sand-water separation efficiency is high.

The utility model relates to the technical field of advanced treatment of landfill leachate, and discloses an ultraviolet-hydrogen peroxide oxygen-based advanced treatment mechanism for landfill leachate, which comprises a reaction barrel, a water inlet pipe is fixedly connected to the side wall of the reaction barrel, a top cover is arranged on the upper surface of the reaction barrel, an output pipe is fixedly connected to the side wall of the reaction barrel, and a water outlet pipe is arranged on the side wall of the reaction barrel. A settling box is arranged on the side wall of the output pipe, a filtering box is arranged on the side wall of the settling box, an activated carbon plate is arranged in the filtering box, a water outlet pipe is fixedly connected to the side wall of the filtering box, a deep treatment mechanism is arranged on the side wall of the reaction barrel, and a fixing assembly is arranged on the side wall of the activated carbon plate. According to the device, the ultraviolet lamp is started for irradiation, meanwhile, hydrogen peroxide is conveyed into the reaction barrel through the metering pump, under irradiation of ultraviolet light, the hydrogen peroxide is decomposed to generate hydroxyl free radicals, landfill leachate is gradually degraded into small molecular substances, and through the structure, the treatment capacity of the device is improved, and the operation cost is reduced.

This invention relates to the field of chromium slag resource utilization technology, specifically to a method for pre-reduction enhanced oxidation extraction of chromium from chromium slag, comprising: S1, mixing calcium-free roasted chromium slag, carbonaceous reducing agent, and sodium carbonate in a mass ratio of 1:(0.4~0.9):(0.05~0.25) and pressing them into shape to obtain a chromium slag preform; S2, under an inert atmosphere, reducing and roasting the chromium slag preform at 850~1050℃ for 30~150 min to generate sodium chromite, and cooling it to room temperature with the furnace to obtain a pre-reduced chromium slag mixture; S3, under an oxygen-containing atmosphere, oxidizing and roasting the pre-reduced chromium slag mixture at 850~1050℃ for 30~150 min to convert trivalent chromium into water-soluble hexavalent chromium compounds, and air-cooling it to room temperature to obtain a roasting product; S4, stirring and leaching the roasting product in an acidic solution, separating the solid and liquid to obtain a leaching residue and a leachate containing hexavalent chromium. The pre-reduction stage enables lattice reconstruction and micropore optimization, creating favorable reaction conditions for the subsequent oxidation stage, thereby significantly improving the oxidation conversion efficiency of chromium.

The invention belongs to the technical field of garbage treatment, and particularly relates to a denitration method for incineration flue gas of a garbage treatment plant. The denitration method comprises the following steps: collecting garbage leachate and separating to obtain a concentrated solution and clear water; heating the concentrated solution through the flue gas to obtain concentrated solution spray with the temperature of 150-250 DEG C; heating the urea solution through flue gas to obtain urea spray; the urea spray and the concentrated solution spray are mixed to obtain mixed spray, and the mixed spray is sprayed to a high-temperature area of the incinerator; the urea spraying ammonia concentration, the mixed spraying ammonia concentration and the concentration of NOX at the smoke outlet of the incinerator are obtained; and based on the concentration of NOX at the smoke outlet of the incinerator, the urea spraying ammonia concentration is adjusted, so that the ratio of the mixed spraying ammonia concentration to the concentration of NOX at the smoke outlet of the incinerator is (1.2-1.5): 1. The concentrated solution spray and the urea spray are mixed and sprayed into the incinerator to react with NOX in the flue gas; ammonia gas in the concentrated solution is utilized, consumption of urea is reduced, the ammonia utilization rate is increased, and meanwhile the problem that leachate is difficult to treat is solved.

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.