1640 results about "Leachate" patented technology

The invention discloses a process and system for recovering phosphorus and fluorine from ardealite leachate, which comprises the following steps: feeding the ardealite leachate into an induced crystallization reactor for induced crystallization, discharging generated large-particle fluorapatite crystals from a crystal discharge port at the bottom of the induced crystallization reactor, and collecting and recycling; aluminum hydroxide flocs and fine-particle fluorapatite crystals enter a cyclone separator along with the effluent, the fine-particle fluorapatite crystals are separated and then flow back to the induced crystallization reactor, the aluminum hydroxide flocs form precipitates in the flocculation sedimentation tank through flocculation to be removed, and the effluent of the flocculation sedimentation tank enters a multi-stage treatment system. According to the method disclosed by the invention, fluorine and phosphorus in the phosphogypsum leachate are recovered together, the recovered fluorapatite finished product is high in purity and can be recycled, and the amount of chemical sludge is also greatly reduced, so that the treatment cost of the sludge is reduced.

The invention discloses a low-permeability sandstone type uranium mine single-well injection and production method, and belongs to the technical field of in-situ leaching uranium mining. The method comprises the steps that an injection and production well is drilled from the ground to a uranium mine layer; pumping liquid carbon dioxide into the uranium ore layer and soaking; a leaching agent is injected into the uranium ore layer in stages, and soaking is carried out every time the leaching agent is injected; extracting the leachate until the uranium concentration in the leachate is reduced by 10% compared with the initial concentration or the uranium concentration in the leachate is reduced to the preset concentration; carbon dioxide and a leaching agent are supplemented into tail liquid formed after uranium recovery is conducted on the leachate, the tail liquid reaches a saturated state, and the tail liquid in the saturated state is reinjected into the uranium ore layer; and a cycle operation step.

The invention discloses an oxidation leaching system and method for argillaceous sandstone uranium ore. The system comprises a uranium leaching pool, a recovery pool, a liquid preparation-dosing unit pool and an intermediate pool. Wherein the uranium leaching tank is provided with a water dispersing layer, a uranium ore layer and a liquid collecting layer from top to bottom, and efficient oxidation of uranium ore is achieved through coupling of oxygen and ferric iron; the recovery pool is sequentially provided with a resin adsorption layer and a water inlet layer from top to bottom, and efficient recovery of uranium in the leachate is achieved; the liquid preparation-dosing unit pool is provided with an acid-resistant submersible sewage pump used for circularly conveying the ore leaching liquid to the uranium leaching pool and adjusting the pH value of the ore leaching liquid and the initial concentration of Fe < 3 + >. And the middle tank drives the ore leaching liquid to form periodic tidal flow circulation in the uranium leaching tank through an acid-resistant submersible sewage pump. According to the system and the method, tidal flow regulation and control, aeration oxygen supply enhancement and iron ion circulation oxidation technologies are coupled, and the uranium leaching rate gt of the argillaceous sandstone uranium ore is achieved by establishing a multi-stage oxidation field domain, optimizing a fluid migration path and establishing an iron element regeneration mechanism; 92%.

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 a method for preparing a bismuth ferrite composite catalytic material by using red mud as well as a product and application of the bismuth ferrite composite catalytic material. The method comprises the following steps: mixing chlorine salt and red mud, uniformly stirring, adding a hydrochloric acid solution, uniformly stirring, roasting, recovering flue gas generated in the roasting process, and obtaining roasting residues and roasting dust generated by recovering the flue gas after roasting is finished; and mixing the roasted dust and bismuth nitrate, uniformly stirring, adding the calcined residue, uniformly grinding, adding water, stirring, drying the material, and calcining to obtain the bismuth ferrite composite catalytic material. The preparation process is simple, the red mud is used as a main raw material, and full-amount resource utilization of the red mud can be achieved. The prepared composite catalytic material can be used for efficiently purifying landfill leachate, and COD, ammonia nitrogen, total phosphorus and heavy metal pollution are efficiently removed through a photocatalysis mechanism.

The invention discloses a method for preparing a composite catalyst by synergistically utilizing red mud and arsenic alkali residues as well as a product and application thereof, and belongs to the field of resource utilization of industrial wastes. The method disclosed by the invention is simple in preparation process, wide in preparation raw material source and capable of realizing full-amount utilization of the red mud and the arsenic alkali residues. Compared with a traditional titanium dioxide and iron arsenate catalyst, the composite catalyst prepared by the method is more excellent in performance, the landfill leachate treatment efficiency can be remarkably improved, and the catalytic removal effect of 2145 mg / g COD, 162 mg / g total phosphorus, 356 mg / g ammonia nitrogen and 122 mg / g mercury can be achieved at most.

The invention discloses a landfill leachate anaerobic-denitrification treatment process and system based on waste molasses synergistic interaction, and belongs to the technical field of sewage treatment. The process comprises the following steps: (1) carrying out two-stage anaerobic digestion on the landfill leachate to remove organic matters and recover biogas, wherein first-stage anaerobic digestion adopts medium-temperature (35 + / -2 DEG C) anaerobic digestion, and second-stage anaerobic digestion adopts high-temperature (55 + / -1 DEG C) anaerobic digestion; (2) removing impurities from the waste molasses, diluting the waste molasses, mixing the diluted waste molasses with activated sludge, fermenting under an anaerobic condition to generate fermentation liquor rich in volatile fatty acid, and adding the fermentation liquor into a denitrification reactor; and (3) constructing an anaerobic-denitrification synergistic system, and increasing the denitrification rate by using the charcoal-loaded nano zero-valent iron (nZVI at BC) as an electronic mediator. According to the method, resource utilization of the waste molasses is realized, the problem of imbalance of the carbon nitrogen ratio of the landfill leachate is solved, anaerobic digestion and nitrification and denitrification processes are coupled, efficient nitrogen removal and organic matter removal are realized, and meanwhile, the sludge yield and the operation cost are reduced.

The invention belongs to the technical field of sewage treatment, and provides a landfill leachate treatment method and system.The landfill leachate treatment method comprises the steps that water quality data of sewage is obtained in real time and analyzed to obtain an analysis treatment signal, a change duration value is obtained through analysis based on the water quality data of the sewage, and whether sewage treatment needs to be regulated or controlled is judged; the method comprises the following steps: acquiring aeration data of an aeration system, analyzing in combination with water quality data to obtain an influence value, judging whether the change of the aeration system can cause the change of the content of dissolved oxygen, acquiring an aeration regulation and control coefficient, and regulating and controlling sewage treatment based on the aeration regulation and control coefficient. On the other hand, the sewage treatment abnormity can be monitored in time, the sewage treatment quality can be improved, and on the other hand, the influence reasons of the sewage treatment abnormity can be found accurately in time, and regulation and control can be carried out in time.

The invention relates to a waste photovoltaic panel recycling method which comprises the following steps: crushing a waste photovoltaic panel until the size of the waste photovoltaic panel is 80-160 meshes, and preparing powder; carrying out acid leaching treatment on the powder, and respectively collecting a leaching solution and a solid material; an acid leaching solution adopted in the acid leaching treatment is a mixed acid aqueous solution of hydrochloric acid and sulfuric acid; the pH of the leachate is adjusted to be neutral with an alkaline agent, then the leachate is mixed with metal iron to be subjected to a replacement reaction, and metal copper is prepared; the solid material is mixed with water, hydrofluoric acid and a flotation agent are added into the obtained mixture for flotation treatment, floats and precipitates are collected respectively, the floats comprise silicon powder, the precipitates comprise glass powder, and the flotation agent comprises one or two of hexadecyl potassium hydrogen phosphate and sodium dodecyl sulfate. According to the recycling method, the silicon powder, the glass powder and the metal copper can be comprehensively recycled from the waste photovoltaic panel.

The invention relates to the technical field of iron ore tailing resource utilization, in particular to a method for preparing iron oxide yellow by leaching iron ore tailings through an advanced oxidation technology, which comprises the following steps: adding a required amount of iron ore tailing powder into a persulfate solution, stirring to react, adding a reducing agent, boiling, filtering, adding alkali liquor to adjust the pH value, and filtering, thereby obtaining the iron oxide yellow. Pure liquid containing ferrous ions is obtained; taking part of the pure solution containing ferrous ions, and adding a potassium hydroxide solution to obtain an iron oxide yellow seed crystal solution; adding a pure solution containing ferrous ions into the iron oxide yellow seed crystal solution, adding an alkali solution to adjust the pH value, reacting, and separating and drying a product to obtain the iron oxide yellow. According to the method, the persulfate is adopted to leach iron from the iron ore tailings, and the iron oxide yellow is prepared from the leachate; harmless treatment of the iron ore tailings and value-added utilization of valuable resources are achieved, the raw material source of the iron oxide yellow industry is widened, and a wider prospect is provided for development of iron oxide yellow.

The utility model provides a treatment system for a refuse landfill, which comprises a plurality of repair wells and a plurality of extraction wells arranged on the refuse landfill, and an aerobic aeration, liquid phase and gas phase extraction system connected with the repair wells and the extraction wells, the aerobic aeration and liquid phase and gas phase extraction system comprises air blasting equipment, moisture and nutrient substance blending equipment, landfill gas extraction equipment and leachate extraction equipment, the air blasting equipment is connected with the repair well, and an inlet connected with the moisture and nutrient substance blending equipment is formed in the air blasting equipment; and the landfill gas extraction equipment and the leachate extraction equipment are connected with the extraction well. According to the utility model, comprehensive treatment of the refuse landfill is realized, and the system is not only suitable for in-situ treatment of stock refuse without excavation and departure, but also suitable for stabilization pretreatment of stock refuse excavation, departure and ex-situ treatment.

The invention relates to the technical field of garbage feeding control, in particular to a garbage feeding device for incineration power generation and an adjusting method. Garbage water content characteristics are analyzed through leachate flow time sequence data, density characteristics are quantified in combination with load coefficients, combustion characteristics are represented through carbon monoxide concentration changes, and a leachate characteristic coefficient, density characteristic coefficient and combustion characteristic coefficient three-dimensional index system is constructed. A clustering algorithm is adopted to carry out mode recognition on garbage grabbing operation, and clustering clusters with similar combustion characteristics are formed. In a cluster to which current garbage grabbing operation belongs, parameters of a feeding speed and a shake-off speed are dynamically optimized based on carbon monoxide concentration distribution characteristics, and a traditional fixed control mode is replaced. According to the method, intelligent matching of garbage component changes and process parameters is achieved, the combustion process is optimized through leachate management, pile compaction degree and the like, and garbage combustion sufficiency is remarkably improved.

The invention discloses a tritiated waste ash purification method and system based on cooperation of multistage adsorption and low-temperature distillation. The method comprises the following steps: S1, sorting treatment; s2, acid leaching treatment; the waste ash to be treated is subjected to acid leaching treatment, and acid leaching slurry is obtained; s3, carrying out separation treatment; carrying out separation treatment on the acid leaching slurry to obtain acid leaching residues and leachate; s4, adsorption treatment; carrying out adsorption treatment on the leachate to obtain penetrating liquid; s5, catalytic treatment; performing catalytic treatment on the penetrating liquid to obtain tritiated water and catalytic treatment tail gas; and S6, carrying out adsorption treatment on the catalytic treatment tail gas. According to the tritiated waste ash purification method, multi-stage adsorption and low-temperature distillation cooperative treatment is adopted, and the tritiated waste ash purification efficiency is greatly improved. According to the tritiated waste ash purification system, pretreatment, adsorption-catalysis and rectification concentration unit independent packaging are achieved through modular design, and rapid disassembly and assembly and multi-line parallel treatment are supported.

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 embodiment of the invention discloses a leachate concentrated water softening control method based on double closed-loop predictive control, and relates to the technical field of automatic control of environmental engineering. The method comprises the following steps: acquiring multi-dimensional data acquired in real time; a dynamic mass balance equation of a magnesium removal / calcium removal reaction is constructed, the dosage of NaOH / Na2CO3 is optimized in a rolling mode on the basis of a model prediction control algorithm, and accurate control over the pH value and the hardness removal rate is achieved; a membrane pollution state space equation is constructed, a membrane type switching and cleaning strategy is optimized in combination with a dynamic programming algorithm, and Pareto optimal control of flux maintenance and cost minimization is achieved. The industrial problems of low control precision, high operation cost and poor system robustness in high-hardness wastewater softening treatment are solved, and the method has remarkable technical advancement and engineering application value.

The utility model discloses a leachate discharge disposal system which comprises a leachate conveying system and a liquid storage pool communicated with the output end of the leachate conveying system, and the leachate conveying system comprises a conveying device, an impurity smashing device and a filtering device; the water outlet end of the conveying system is communicated with the liquid storage tank, and a deslagging mechanism and a dredging mechanism are arranged in the liquid storage tank. The conveying device is arranged to dredge the cylinder body in time, the impurity smashing device is used for cutting and refining waste residues, and the filtering device is arranged to prevent large impurities from forming clamping stagnation; the slag discharging mechanism is arranged to periodically and orderly discharge sediments, the slag discharging efficiency is improved, the dredging device is arranged to discharge floating objects, meanwhile, blockage caused by accumulation of the floating objects can be dynamically prevented, and use is convenient and fast.

The invention discloses a landfill leachate pretreatment process, and belongs to the technical field of landfill leachate treatment.The landfill leachate pretreatment process comprises the following steps of S1, pre-oxidation and catalytic chain breaking, S2, dual-alkali calcium and magnesium removal, S3, magnetic flocculation and adsorption, S4, dynamic membrane filtration unit treatment and S5, control system integration. The mass transfer efficiency of an oxidizing agent and pollutants is enhanced, the dosing of the agent is dynamically regulated and controlled by combining an ORP (oxidation reduction potential) meter, so that parameters such as potential, pH value and temperature are kept in an optimal interval, the oxidation reaction is ensured to be fully carried out, macromolecular organic matters are efficiently decomposed, and a foundation is laid for subsequent treatment; the collision efficiency of calcium and magnesium ions is improved through the water distributor and the granular sludge bed, and meanwhile, the chemical dosage is dynamically controlled and the pH value is accurately adjusted through the sensor, so that the calcium and magnesium ions are efficiently removed, the chemical waste is reduced, and the operation cost is reduced.

The invention provides equipment for extracting aluminum and calcium from solid waste and a method for recovering valuable components. The solid waste recovery device comprises a bottom plate, a pedestal, an extraction tank, a treatment tank and an extraction mechanism, the pedestal is installed on the upper surface of the bottom plate, the outer wall of the extraction tank is installed on the inner wall of the pedestal, a water tank is installed on the upper surface of the bottom plate and located on one side of the pedestal, and the treatment tank is fixedly arranged on the upper surface of the water tank; according to the scheme, through system integration of hydrothermal acid leaching, multi-stage solid-liquid separation and leachate refining technologies, deep extraction and efficient utilization of valuable elements such as fluorine, sodium and aluminum are achieved, the resource recovery rate is remarkably increased, the high-temperature energy consumption mode of traditional pyrogenic process treatment is broken through, the energy consumption is reduced, and the energy consumption is reduced. And the convex plate continuously rotates to control the guide wheel to enable the lifting rod to do reciprocating lifting motion in the extraction tank, so that the liquid level vortex phenomenon caused by traditional rotation can be eliminated, and the top liquid level of the extraction tank is more stable.

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 invention provides a pretreatment method of a fluorine-containing sample for determining fluorine content by an ion selective electrode method, and belongs to the technical field of fluorine content detection. The pretreatment method provided by the invention comprises the following steps: mixing a fluorine-containing sample, absolute ethyl alcohol and an alkali reagent, and carrying out heat treatment to obtain a heat-treated sample; the heat treatment comprises first heat treatment and second heat treatment which are sequentially carried out; the temperature of the first heat treatment is 150-170 DEG C; the temperature of the second heat treatment is 650-750 DEG C; and leaching the heat-treated sample with water, and fixing the volume of the obtained leachate to obtain the fluorine-containing sample to be detected. According to the method, the fluorine-containing sample can be prevented from splashing during alkali fusion, the safety is good, the problem that the fluorine content of the fluorine-containing sample is low in the ion selective electrode method detection process is solved, and meanwhile, the time consumption is short, the efficiency is high, and the cost is low.

The invention relates to the technical field of intelligent inspection, in particular to a solid waste storage yard remote cruise and hidden danger recognition system based on the AI technology, which comprises a multi-source monitoring data acquisition module, a storage yard feature enhancement processing module, a multi-mode hidden danger collaborative recognition module and a dynamic cruise path generation and execution module. The unmanned aerial vehicle carries a multispectral camera and a laser radar to cruise according to an initial path, collects visible light images, infrared images and terrain point cloud data of a storage yard, and receives leachate monitoring data. Image enhancement is realized through optical dust scattering compensation and a pile body surface curvature mapping graph; the deformable convolution unit is combined with percolate temporal and spatial change rate anomaly judgment to trigger high-precision identification, and outputs a hidden danger type and a space coordinate set; according to the method, a closed loop of recognition, path optimization and re-acquisition is realized, and the hidden danger detection precision and the monitoring efficiency are improved.

The invention discloses a phosphogypsum leachate-carbonate rock dynamic corrosion reaction analysis method based on numerical simulation, and aims to research a migration-corrosion coupling mechanism of acid leachate in a carbonate rock fracture network. The method comprises the following steps: firstly, acquiring a two-dimensional image sequence of a rock core sample through CT (Computed Tomography) scanning, carrying out operations such as threshold segmentation, membrane enhancement and a light shading algorithm on an image by utilizing AVIZO software, extracting fracture structure parameters and establishing a high-precision three-dimensional model; then, multiple groups of simplified models with different fracture widths are constructed in COMSOL Multiphysics, a Darcy flow field and a solute concentration field are coupled on the basis of the Darcy law and a dilute matter transfer theory, and the dynamic corrosion effect under the multi-field coupling effect is quantitatively represented by setting hydraulic gradient boundary conditions and chemical reaction kinetic parameters; the dynamic corrosion reaction process of calcium ions, hydrofluoric acid, sulfuric acid and phosphoric acid in the ardealite leachate and carbonate rocks with different crack widths is accurately simulated.

The invention discloses a method for realizing pollution reduction and carbon reduction by phosphogypsum recycling. The method comprises the following steps: (1) washing phosphogypsum with water to remove soluble impurities, neutralizing residual acid, and calcining and activating; (2) pretreatment of the landfill leachate: magnesium salt and phosphate are added, the pH of the landfill leachate is adjusted, and free ammonia NH3 is released through low-temperature heating; (3) the pretreated landfill leachate is sprayed to capture CO2 in the flue gas, and a (NH4) 2CO3 solution is obtained; (4) fully mixing a (NH4) 2CO3 solution with the pretreated ardealite, and controlling the reaction conditions in a closed reactor, so that the ardealite and (NH4) 2CO3 are subjected to a heterogeneous reaction to generate CaCO3 and (NH4) 2SO4; and (5) product purification: carrying out solid-liquid separation on the mixed solution by adopting a multi-stage crystallization process to obtain a building material, and carrying out gradient cooling and recrystallization purification on the filtrate to obtain the nitrogen fertilizer. According to the method, recycling of the landfill leachate and the ardealite is achieved, and CO2 in the flue gas is efficiently removed.

The invention relates to the technical field of water treatment, in particular to a nanofiltration membrane integration process for treating leachate of a garbage transfer station and a flocculating agent for a pretreatment section of the nanofiltration membrane integration process. According to the flocculating agent, the efficient composite flocculating agent is generated in situ through the cooperation of the ionic liquid grafted diatomite and the sulfonate modified branched polyamide cross-linked substance and the combination of the aluminum salt and the ferric salt, so that rapid removal of multiple pollutants and enhancement of floc stability are realized, and the follow-up membrane blockage risk is remarkably reduced. According to the process, an innovative pretreatment-graded nanofiltration-deep purification mode is adopted, membrane types of nanofiltration sections are optimized and screened according to pollutant characteristics, flexible combination of molecular step filtration, terminal combined light-Fenton oxidation, compact nanofiltration or reverse osmosis is realized, and efficient reduction of COD (Chemical Oxygen Demand) and salt content and energy consumption control are taken into consideration. The process has the advantages of stable effluent quality, low membrane pollution and greatly reduced medicament and operation cost, adapts to different emission standards, and has significant engineering application value.

The electro-catalytic oxidation treatment device comprises an electro-catalytic box, a plurality of water pipe connectors are arranged at one length end of the electro-catalytic box, a supporting plate is arranged at the bottom in the electro-catalytic box, a plurality of polar plate groups are arranged on the upper portion of the supporting plate in the length direction, and insulating bars penetrate through the polar plate groups; the polar plate group comprises two cathode plates and an anode plate, the anode plate is positioned in a gap between the two cathode plates and is parallel to the two cathode plates, the bottoms of the anode plate and the two cathode plates are fixedly connected, and the anode plate and the cathode plate are L-shaped and form the right-angle U-shaped polar plate group; the upper ends of the anode plates and the cathode plates are fixedly connected with metal rods, the metal rods penetrate out of the side walls of the adjacent electro-catalysis boxes, and electric connectors are arranged at the outer ends of the metal rods. According to the electrocatalytic oxidation treatment device for the landfill leachate, the generation amount of oxidants such as hydroxyl radicals is changed by adjusting the current and voltage of the catalytic polar plate, so that pollutants are oxidized and removed. The method has the characteristics of simplicity in operation, low cost, broad spectrum, full quantization and the like.

The invention belongs to the technical field of sewage treatment intelligent control, and provides a landfill leachate treatment intelligent chemical adding dynamic optimization system which comprises a monitoring module, a fluctuation early warning module, a stable chemical adding module and a fluctuation chemical adding module. The method comprises the following steps: performing water quality fluctuation analysis and future water quality fluctuation trend analysis on the landfill leachate, judging whether a fluctuation signal is generated or not, marking a fluctuation time period and a stable time period, constructing a kinetic equation for chemical reaction based on dosing in the landfill leachate, coupling with a material balance equation, and establishing a complete mechanism model. If the current time period is in the stable time period, periodically generating a dosing decision for the landfill leachate, and if the current time period is in the fluctuation time period, triggering model parameter correction, constructing and training a parameter correction model based on a time sequence neural network, and periodically correcting a complete mechanism model and the dosing decision.

The invention discloses a liquid quantum dot fertilizer and a preparation method and application thereof.The preparation method comprises the steps that treated rice straw is smashed through a smashing machine, the smashed rice straw is placed in a closed container, an ammonia water solution is added, and after even stirring and mixing are conducted, incubation is conducted in the closed container in time under illumination; after incubation is completed, straw residues are twisted and removed, obtained leachate is liquid carbon quantum dot fertilizer, and the straw residues are returned to the field; or the incubated straw residues and the ammonia water solution are subjected to ultrasonic treatment continuously, the straw residues are removed, a liquid carbon-silicon quantum dot fertilizer is generated, and the straw residues are returned to the field. The two liquid quantum dot fertilizers have good compatibility with trace element foliar fertilizers, amino acid-containing foliar fertilizers or pesticides, can improve the crop utilization rate of the trace element foliar fertilizers and the amino acid-containing foliar fertilizers, and can realize simultaneous fertilization and disease control of crops when being mixed with the pesticides. The technology is convenient, economical, practical and efficient.

The invention discloses a method for recovering rare earth elements from fluorgypsum, which comprises the following steps: 1) crushing fluorgypsum, and mixing with a sulfuric acid aqueous solution to obtain a mixed slurry I; roasting the mixed slurry I to obtain roasted ore; 2) mixing the roasted ore with water to obtain mixed slurry II; leaching the mixed slurry II to obtain a leached product; carrying out solid-liquid separation on the leaching product to obtain a leaching solution and water leaching residues; 3) adding a precipitant into the leachate, and stirring for precipitation reaction to obtain mixed slurry III; carrying out solid-liquid separation on the mixed slurry III to obtain precipitates containing rare earth elements and filtrate I; 4) adding a water treatment agent into the filtrate I, and stirring for reaction to obtain mixed slurry IV; and carrying out solid-liquid separation on the mixed slurry IV to obtain mixed residues and filtrate II. According to the method, the rare earth elements in the fluorgypsum are efficiently recycled.

The invention relates to a method for recycling battery-grade nickel sulfate from nickel-containing industrial waste, and belongs to the technical field of nonferrous metallurgy. The method comprises the steps that the nickel-containing industrial waste is subjected to water leaching treatment, and nickel-containing leachate is obtained; carrying out gradient pH regulation and control on the nickel-containing leaching solution by adopting calcium carbonate to obtain a purified solution; carrying out first countercurrent extraction on the purified liquid by adopting an organic phase I with the D2EHPA concentration of 0.1-0.3 mol / L; carrying out second counter-current extraction on the raffinate I obtained in the step (3) by adopting an organic phase II with the CYANEX 272 concentration of 0.05-0.2 mol / L; the raffinate II obtained in the step (4) is subjected to adsorption and oil removal through activated carbon and then is subjected to evaporative crystallization, and nickel sulfate crystals and crystallization mother liquor are obtained. The method is high in nickel recovery rate, the purity of nickel sulfate is larger than or equal to 99.9%, and the sodium content is low.

The utility model belongs to the technical field of water treatment, and discloses a double-circulation dielectric barrier discharge water treatment device which comprises a grounding electrode cooling tank, a water pump, a dielectric barrier discharge system, a high-voltage power supply, an internal circulation flowmeter, a fan, a water treatment tank, an air pressure balance tank, a freezing dryer, an external circulation flowmeter, an automatic air pressure supply valve, an oxygen tank and an aeration disc. The double-circulation dielectric barrier discharge water treatment device provided by the utility model can be used for treating various organic wastewater such as industrial wastewater, domestic wastewater and landfill leachate, and has the advantages of simple equipment, stable operation, low energy consumption, high treatment efficiency, no secondary pollution and the like.