61 results about "Sulfate radical" patented technology

The invention discloses a nickel-containing etching wastewater treatment process, which belongs to the technical field of environmental protection, and comprises a raw water regulating tank, a pH pre-regulating tank, a heterogeneous catalytic oxidation tower, a neutralization coagulation tank, an inclined tube sedimentation tank and a clean water tank which are connected in sequence. According to the process, under the neutral condition, a catalyst loaded with cobalt manganese oxide is used for activating sodium hydrogen persulfate, high-activity sulfate free radicals are generated, a Ni-EDTA complex structure is fractured in a targeted mode, free nickel ions are released in situ, organic ligands are synchronously mineralized, and the adding amount of sodium hydrogen persulfate is dynamically adjusted through a clean water pool closed-loop control system; and high-purity nickel hydroxide precipitate is generated through alkaline precipitation and coagulation, so that efficient solid-liquid separation is realized. The treatment process disclosed by the invention is compact in flow and stable in operation, effectively solves the problems of difficult complex breaking, low nickel removal efficiency, high sludge toxicity, difficult resource recovery and the like when the EDTA complex nickel wastewater is treated by a traditional method, realizes closed-loop recovery of nickel resources, and has the remarkable advantages of low cost, high efficiency and environmental friendliness.

The invention provides an efficient chloramphenicol degradation method based on Co-Cu-carbon composite nano-catalyst activated peroxymonosulfate, which comprises the following steps: regulating the Co / Cu molar ratio in a bimetal organic framework precursor, and performing pyrolysis to prepare the Co-Cu-carbon composite catalyst with an optimized pore structure, graphitization degree and metal dispersity; peroxymonosulfate is activated by utilizing the synergistic effect of Co / Co and Cu / Cu redox pairs to generate sulfate free radicals, hydroxyl free radicals, singlet oxygen and superoxide free radicals, and direct oxidative degradation of chloramphenicol is promoted by taking a catalyst as an electron transfer bridge; the method realizes rapid and efficient removal of chloramphenicol, high mineralization rate, excellent cycle stability and strong anti-interference capability, and solves the technical problems of low removal efficiency, high cost and easy secondary pollution in the prior art.

The invention provides a preparation method of ultrahigh-purity copper. The preparation method comprises the following steps: providing a first anode, a first cathode and an electrolyte; the electrolyte comprises the following components: a purified copper salt solution, inorganic acid, an oxidizing agent and an additive, the purified copper salt solution comprises purified copper salt and water, the purified copper salt comprises copper sulfate and copper nitrate, and the molar ratio of nitrate to sulfate in the purified copper salt solution is (1.5-9): 1; the additive comprises any one or a combination of at least two of an alcohol compound, polyacrylamide or a tetrazole compound; and the first cathode and the first anode are immersed in the electrolyte for electrochemical deposition, and the ultra-high-purity copper is obtained. The electrolyte composed of the purified copper salt solution, the inorganic acid, the oxidizing agent and the additive is adopted, the proportion of nitrate radicals to sulfate radicals in the purified copper salt solution is controlled, the impurity content of the sulfur element and the silver element in the electrolyte can be controlled, and preparation of the ultra-pure electrolytic copper is achieved.

The invention relates to a lanthanide oxide electrochemiluminescence aptamer sensor with dual signal amplification for detecting acetamiprid as well as a preparation method and application of the lanthanide oxide electrochemiluminescence aptamer sensor. According to the sensor, terbium-doped europium oxide (Eu2O3: Tb < 3 + >) modified by gold nanoparticles (Au NPs) is used as a luminous body, and the electrochemical luminescence performance can be remarkably improved through multiple mechanisms: on one hand, the Au NPs can effectively promote generation of more sulfate free radicals; on the other hand, the surface defect passivation effect and the efficient synergistic effect of energy transfer jointly achieve effective amplification of signals. In addition, the wool ball-shaped Ag NPs is used as a plasma resonance signal amplification source, so that the ECL intensity of the sensor is further enhanced. The prepared electrochemical luminescence sensor with the dual signal amplification effect is used for detecting acetamiprid (ACE), has a wide linear range and a low detection limit, and has a wide application prospect in detection of acetamiprid residues in a water environment.

The invention belongs to the technical field of wastewater treatment, and discloses an efficient evaporative crystallization treatment process for zinc-containing wastewater, which comprises the following steps: 1) adding a hydrogen peroxide solution into the zinc-containing wastewater, and applying ultrasonic waves to carry out ultrasonic enhanced oxidation; 2) stopping ultrasonic treatment, introducing sulfate radicals into the zinc-containing wastewater, adjusting the pH value, precipitating, separating the precipitate, adding a chelating agent and an anti-scaling agent into the zinc-containing wastewater, stirring for reaction, separating the precipitate, and then performing microfiltration to obtain pretreated zinc-containing wastewater; 3) feeding the pretreated zinc-containing wastewater into a multi-stage flash evaporation system to obtain a zinc-containing concentrated solution; 4, the zinc-containing concentrated solution is fed into a crystallizer, microbubbles are introduced, meanwhile, ultrasonic waves are applied to enhance gas-liquid interface disturbance to promote crystallization, crystals are separated from crystallization liquid and then dried, and the zinc salt is obtained.The technology achieves the multiple purposes of low scaling rate, low energy consumption, high recovery rate and high zinc salt purity, and has excellent industrial implementability and popularization value.

The invention discloses a high-concentration sulfate acid pit water treatment method based on an acid-resistant SRB biological cathode, which comprises the following steps: enabling acid pit water to pass through a grid and then enter a regulating reservoir; introducing the wastewater in the regulating tank into a biological membrane electrochemical device for electrochemical reaction; oxidizing Fe < 2 + > in the wastewater into Fe < 3 + > on a titanium-based IrO2 anode plate and releasing electrons in an anode chamber; in the cathode chamber, an acid-resistant SRB bacterial film loaded on the surface of the carbon felt electrode reduces SO4 < 2-> into S < 2-> by utilizing transferred electrons; cO2 microbubbles are introduced into the liquid in the cathode chamber to react with S < 2-> to generate sulfur precipitates, and the reacted mixed liquid enters a cyclone separator to realize gas-solid separation; and carrying out hydrolysis reaction on Fe < 3 + > in the effluent of the anode chamber to generate Fe (OH) 3 precipitate, mixing the Fe (OH) 3 precipitate with sodium silicate, and calcining to convert the mixture into magnetic alpha-Fe2O3. The method can effectively remove SO4 < 2-> and recover iron sludge.

The application discloses a high-concentration sulfate radical acid mine water treatment method based on acid-resistant SRB biological cathode, which comprises the following steps: after the acid mine water is filtered through a grid, the acid mine water is fed into an adjusting tank; the wastewater in the adjusting tank is fed into a biological membrane electrochemical device to perform an electrochemical reaction; in an anode chamber, Fe 2+ in the wastewater is oxidized into Fe 3+ and releases electrons; in a cathode chamber, the acid-resistant SRB bacterial membrane loaded on the surface of a carbon felt electrode utilizes the transmitted electrons to reduce SO4 2‑ into S 2‑ ; CO2 micro-bubbles are fed into the liquid in the cathode chamber to react with S 2‑ to generate sulfur precipitate, and the mixed solution after the reaction is fed into a cyclone separator to realize gas-solid separation; Fe 3+ in the water in the anode chamber generates Fe(OH)3 precipitate through a hydrolysis reaction, the Fe(OH)3 precipitate is mixed with sodium silicate, and is calcined to be converted into alpha-Fe2O3 with magnetism. The method can effectively remove SO4 2‑ and recover iron mud.

The invention discloses a vibrio devilis JHS2 strain and application thereof, and belongs to the technical field of microorganisms. The vibrio velutina JHS2 provided by the invention is separated and screened from a natural seawater environment of a Yitai golden beach sea area in China, the strain can efficiently and directionally degrade SC-FUC, a degradation product has a relatively high sulfate radical retention rate and very concentrated molecular mass distribution, and under the conditions that the growth temperature is 30 DEG C, the salinity is 3%, the pH value is 7.5 and the inoculum size is 3%, the yield of the SC-FUC is increased, and the yield of the SC-FUC is increased. The degradation rate of the strain on SC-FUC reaches 68.04%, the mass fraction of sulfate radicals of a degradation product is 33.78%, the relative molecular mass distribution range is within 600Da, and the sea cucumber fucoidin oligosaccharide with the DP being 2-4 can be prepared.

The invention provides a method for degrading organic matters in wastewater by using sulfate free radicals, and relates to the technical field of sewage treatment. The method for degrading the organic matters in the wastewater by using the sulfate free radicals comprises the following steps: S1, pre-enrichment and mechanical energy triggering; s2, self-triggering activation and targeted degradation; and S3, performing adaptive process control. According to the technology, the reaction is driven by wastewater flowing mechanical energy through a self-triggering mechanism, energy consumption is greatly reduced, targeted enrichment of pollutants and in-situ utilization of free radicals are achieved through an interface micro-reaction field, the degradation efficiency and anti-interference performance can be improved, the whole process is environmentally friendly, and the operation cost is lower.

The invention belongs to the technical field of isotope recovery and separation, and discloses a method for recovering high-abundance C13 carbon dioxide from C13 urea based on acidic constant-temperature hydrolysis. According to the method, the hydrolysis rate of the C13 urea is maintained by selecting proper dilute sulfuric acid concentration, sulfate radicals and urea are prevented from forming an adduct by controlling the dilute sulfuric acid concentration, the release efficiency of the 13CO2 is increased, the reaction rate is controlled, and side reaction is avoided. The invention further provides a set of reaction device for recycling 13CO2 through acidic constant-temperature hydrolysis of C13 urea under reduced pressure, the gas-liquid phase contact area and residence time are remarkably increased by arranging the rectifying column, visual water removal and low temperature are realized through the water removal column and the condenser pipe, the problems of external CO2 pollution, high impurity air content and relatively high water content are solved, and the method is suitable for industrial production. And high abundance recovery of the 13CO2 is ensured.

The application discloses a method for degrading VOCs by using a high-level oxidation coupling wet washing process. x The strong active species such as sulfate radicals and hydroxyl radicals generated by activating the PMS solution by the catalyst are degraded into small molecules, even carbon dioxide and water. In the application, the oxidant is added into the reactor body drop by drop by using a peristaltic pump, so that the removal rate of VOCs and the stability of the mineralization rate are effectively improved, the utilization rate of the oxidant is improved, and the process is low in energy consumption, simple in operation and difficult to cause secondary air pollution.

The application discloses a method for preparing modified carrageenan by using a slurry method and application thereof. The method comprises the following steps: uniformly mixing potassium salt, deionized water, an oxidant and carrageenan to obtain a slurry, preparing modified carrageenan by using the slurry oxidation method, and improving the stability of the modified carrageenan in the oxidation degradation reaction through the electrostatic action between potassium ions and sulfate radicals in the carrageenan, so that the content of the sulfate radicals in the modified carrageenan is improved. The method uses a single hydrogen peroxide oxidant, has simple and efficient preparation, low solvent consumption, is green and environment-friendly, and has the dual advantages of low molecular weight and high sulfate radical content of the prepared modified carrageenan, and has a wide application prospect in the field of anticoagulation.

The invention discloses a rare earth radioactive slag reduction and barium sulfate slag recycling method based on transformation and decomposition of barium sulfate. The method comprises the following steps: drying, ball-milling and screening rare earth radioactive slag, adding water into sodium hydroxide, and mixing to obtain rare earth slag; roasting and transforming the rare earth slag under the condition of introducing carbon dioxide; washing the roasted and transformed rare earth slag with water; the washed rare earth slag is subjected to acid dissolution and solid-liquid separation, and high-silicon slag without radioactive elements and an acid solution with the radioactive elements are obtained; sulfuric acid is added into the acid solution step by step for fractional precipitation and radium removal, and barium and radium residues containing radioactive elements and barium sulfate residues without radioactivity are obtained through solid-liquid separation; adjusting the mass ratio of the barium sulfate slag and sodium hydroxide, then carrying out alkali conversion and acid dissolution to obtain a barium chloride solution, and recycling the barium chloride solution for removing sulfate radicals from the rare earth feed liquid. According to the method, barium sulfate in the rare earth radioactive slag can be transformed into more than 95% of soluble barium salt, the amount of the rare earth radioactive slag is reduced by more than 85%, and the barium circulation rate reaches more than 90%.

The invention discloses a method for detecting the content of sulfate radicals in gallium waste liquid, which is characterized in that the sampling amount is reduced from original 10mL to 5mL, the addition amount of concentrated hydrochloric acid is adjusted from 20mL to 5mL, and the pH value of the system is still maintained at 1-2 after the reaction is complete; the barium chloride solution keeps the original procedure dosage (20mL 10%), barium sulfate is ensured to be completely precipitated, and the steps of filtering, washing, firing and weighing are completed according to the original procedure after precipitation. Multiple parallel tests verify that the relative standard deviation of the method is smaller than or equal to 3%, and the production detection precision requirement is met; the method is compatible with the existing standard operation process of an enterprise, adapts to the characteristic of high concentration of gallium waste liquid sulfate radicals, does not need to add equipment or extra training, and can be directly applied to the ground.

The invention provides a tunnel lining concrete self-adaptive damage evaluation method based on the rich sulfate radical effect, and relates to the technical field of tunnel safety prevention and control. Experimental conditions are formulated according to the actual sulfate radical concentration range and the temperature range of a tunnel, and a permeation model is obtained; according to the method, sulfate radical permeation conditions are simulated in a tunnel lining three-dimensional model, point locations with high permeation depths are selected according to simulation results for sampling observation, and the simulation results are corrected, so that the simulation results are corrected by using actual results, and meanwhile, the conditions of the whole tunnel lining are judged by using the corrected simulation permeation depths. Meanwhile, dangerous points are given, the sulfate radical permeation change condition of the lining in long-term use is considered, and damage evaluation is completed in a mode of combining deduction and field data.

The invention relates to ferrous phosphate based on mixed acid and iron powder and a preparation method and system thereof.The preparation method comprises the steps that dilute phosphoric acid and dilute sulfuric acid are mixed, pure iron powder is added into the mixed acid according to the ratio of n (p) to n (Fe) being (0.67-1): 1, and an iron dissolving reaction is conducted after a certain temperature is reached; taking the temperature as a starting point, sampling once every time period, analyzing the content of Fe < 2 + > in the obtained sample, and obtaining a ferrous liquid when the content of Fe < 2 + > in the sample reaches 3.5-5.0%; adding ammonia water into the ferrous liquid until the pH value of a reaction system reaches 5.0-6.5 to obtain slurry; and aging the slurry, and carrying out filter pressing, washing and drying to obtain the ferrous phosphate octahydrate. According to the method, the content of sulfate radicals in the obtained product can be effectively controlled while the use amount of phosphoric acid is reduced, the product quality is effectively improved, meanwhile, the thickness distribution uniformity of a ferrous phosphate octahydrate crystal lamellar structure is controlled, the thickness of the lamellar structure is reduced, the product quality is improved, and the compaction density of lithium iron phosphate is improved.

This invention provides a highly active surface-modifying agent for saline-alkali land and its application, belonging to the field of saline-alkali land improvement technology. Under ultrasonic conditions, a sulfur source is pre-loaded into biomass. Under the action of sulfate free radicals, a hydrothermal reaction process etches the surface of the hydrothermal carbon, increasing the specific surface area and porosity. Simultaneously, the broken C-C bonds provide active sites for sulfur doping. At the same time, alginate and Fe... 3+ Cross-linking forms a hydrogel network that encapsulates hydrothermal carbon, enhancing sulfur stability, reducing direct contact between the material and soil, protecting the material's functional groups, achieving efficient ion exchange within the membrane, and increasing the material's interaction time. This invention, through a triple mechanism of "exchange desalination – soil aggregation – nutrient enhancement," can improve the physical, chemical, and biological properties of saline-alkali soils, promote crop growth, reduce soil heavy metal content, enhance carbon sequestration, reduce the bioavailability and toxicity of pollutants, and restore ecosystem structure and function.

The invention relates to the technical field of wastewater treatment, and particularly discloses a treatment process of high-sulfate organic wastewater. The method comprises the following steps: dividing the high-sulfate organic wastewater into two streams under the driving of an electric field through electrodialysis; transferring sulfate radicals from the high-sulfate organic wastewater to clear water to obtain a concentrated solution rich in the sulfate radicals; and the high-sulfate organic wastewater becomes a desalinated solution rich in COD, and can be discharged after reaching the standard through conventional biochemistry. The high-salt concentrated solution rich in sulfate radicals further comprises a part of COD and ammonia nitrogen which are transferred together, biochemical treatment is carried out through halophiles tolerant to high-concentration salt, the COD and the ammonia nitrogen are oxidized, and after the ammonia nitrogen is oxidized into nitrate nitrogen, a sulfur autotrophic denitrification process is connected to remove total nitrogen. The sulfur recovered from the biochemical treatment of the desalinated liquid is used as a filler and an electron donor of sulfur autotrophic bacteria, NO3-N is reduced into N2, an external carbon source is not needed, meanwhile, up-to-standard emission of total nitrogen and cyclic utilization of sulfur resources are realized, and the method has a wide application prospect.

This invention discloses a method and system for the synergistic degradation of COD and new pollutants in industrial wastewater based on catalytic reduction-oxidation. The method includes: adjusting the pH of dyeing and printing wastewater containing perfluorinated compounds (PFCs) to alkaline; adding a reducing agent (sulfite) and a catalyst (alkali metal iodide); then carrying out a catalytic reaction under ultraviolet light irradiation and stirring; adding an oxidizing agent (persulfate PMS) and a catalyst (ferrous sulfate) to the effluent after catalytic reduction; and carrying out a catalytic oxidation reaction under light-proof and stirring conditions. The ferrous sulfate activates the PMS to generate sulfate radicals, completely mineralizing the short-chain fluorine-containing intermediates generated in the reduction stage into CO2 and F. ‑ Simultaneously, it degrades residual organic matter. The method of this invention can efficiently and thoroughly degrade perfluorinated compounds in actual dyeing and printing wastewater, and has strong anti-interference ability, low operating cost, and no secondary pollution.

This invention relates to a method, system, and application for remediating black and odorous sediment. The remediation method includes the following steps: homogenizing the black and odorous sediment; detecting the ferrous content of the sediment and calculating the amount of persulfate to be added based on the molar ratio; using the ferrous-rich sediment as an activator, adding persulfate and stirring to mix the persulfate and sediment for reaction; adjusting the stirring time; using ferrous activator to generate sulfate free radicals from the persulfate, which oxidize the black and odorous substances, causing heavy metals to leach out; centrifuging and filtering the mixture, collecting the interstitial water containing heavy metals, and washing the mixture to obtain harmless sediment. The remediation method of this invention can achieve Fe... within 5 minutes. 2+ With a removal rate of ≥79% and an AVS removal rate of ≥89% within 2 minutes, the leaching rates of Zn, Mn, Ni, and Pb in black and odorous sediment can reach 41%, 32%, 19%, and 17%, respectively, which belongs to the field of environmental engineering technology.

The invention relates to the technical field of industrial wastewater treatment, and discloses a heavy metal and thallium removal process for sintering desulfurization wastewater, which comprises the following steps: regulating the pH value of the wastewater to 8.5-9.0 through lime water pretreatment, and synchronously precipitating sulfate radicals; the method comprises the following steps: adding a 10% sodium sulfide solution (5L / m < 3 >) into a filtrate to remove heavy metal ions and thallium, carrying out flocculation filter pressing by using 1% polyacrylamide (300mL / m < 3 >), then removing excessive sulfur ions by using a 15% polyferric sulfate solution (5L / m < 3 >), finally adjusting the pH value by using lime water, carrying out secondary flocculation filter pressing to remove iron ions, and finally discharging the filtrate after reaching the standard. The process does not need heating and an oxidizing agent, synchronously removes various heavy metals and thallium at normal temperature, is low in medicament cost, does not introduce organic matters, realizes resource utilization of precipitates, and is suitable for efficient and environment-friendly treatment of the desulfurization wastewater in the iron and steel industry.

The invention discloses a method for producing persulfate based on cathode CO2 electroreduction paired anode in an acidic sulfate medium, which comprises the following steps: firstly, respectively pumping acidic sulfate electrolyte into a cathode chamber and an anode chamber, and simultaneously introducing CO2 into an inlet of a gas chamber; oxidizing SO4 < 2-> on the surface of the anode in a direct oxidation mode or a hydroxyl free radical mediated indirect oxidation mode to generate sulfate free radicals, and further generating persulfate; the CO2 entering the gas chamber diffuses from the diffusion layer of the cathode diffusion electrode to the surface of the catalyst layer, the CO2 generates * COOH and * OCHO intermediates on the surface of the catalyst layer, and the formed gas product diffuses to the gas chamber; a correspondingly formed liquid product escapes into the acidic sulfate electrolyte and is collected at an outlet of the cathode chamber. According to the invention, in an acidic sulfate medium, the cathode generates CO2RR and the anode generates persulfate at the same time, the two electrodes synergistically produce a high-added-value product, an electrolyte system is efficiently utilized while electric energy is efficiently utilized, and the technical economy of an electrochemical system is improved.

The invention discloses an advanced oxidation treatment device and treatment method for printing and dyeing wastewater, and relates to the technical field of sewage treatment.The device comprises a closed reactor, a feeding port is formed in the bottom of the closed reactor, and a discharging port and an exhaust port are formed in the top of the closed reactor; a functional filler layer is arranged in the closed reactor; activating balls and persulfate are arranged in the functional filler layer, the activating balls are formed by soaking Fe3O4 nano-particles and wine brewing wastewater fermentation liquor, and volatile fatty acid adsorbed on the surfaces of the activating balls is at pH gt; when the temperature is 7.5, the persulfate is desorbed and activated to generate sulfate free radicals. According to the invention, an autocatalysis system composed of pH responsive activation balls and persulfate is constructed in the functional filler layer, so that sulfate free radicals can be generated without adding an external agent, and meanwhile, the purpose of reducing carbon emission by inhibiting the activity of methanogens through metabolic competition is achieved.

The invention discloses a biological denitrification nitrogen removal experiment device, and relates to the technical field of biological denitrification nitrogen removal, the biological denitrification nitrogen removal experiment device comprises a reaction tower main body and a water storage tank group, the water storage tank group is located on the side of the reaction tower main body and is responsible for liquid storage, a baffle is fixed on the inner wall of the reaction tower main body through welding, and a middle through pipe is mounted in the reaction tower main body; the denitrification process is synergistically optimized, the denitrification efficiency and stability are improved, the mixed filler layer composed of ceramsite and sulfur autotrophic denitrification filler according to the volume ratio of 2: 1 is adopted, the advantages of sulfur autotrophic denitrification and heterotrophic denitrification are effectively combined, and the synergistic effect not only accelerates the denitrification rate, but also improves the denitrification efficiency and stability. The problems that the concentration of sulfate radicals in effluent is increased, the pH value is reduced and the like due to single sulfur autotrophic denitrification are solved, meanwhile, due to the reasonable structural design of the filler layer and the backwashing system, filler blockage is avoided, and long-term stable operation of the experimental device and reliability of the denitrification effect are ensured.

The utility model relates to a sulfate radical wastewater treatment system which comprises the following components: a reaction tank which is added with Ca (OH) 2 powder and is used for carrying out chemical precipitation reaction on the introduced sulfate radical wastewater, adjusting the pH value of the sulfate radical wastewater to be neutral and forming floc; the coagulation tank is used for carrying out coagulation reaction on the sulfate radical wastewater of which the pH is adjusted to be neutral to form larger flocs; and the precipitation tank is used for carrying out solid-liquid separation on the sulfate radical wastewater subjected to the coagulation reaction, supernate obtained after solid-liquid separation overflows and is discharged, and sludge at the bottom of the precipitation tank is discharged into the sludge treatment unit through pumping. The device is scientific and reasonable in design and easy to realize, sulfate radicals in water are removed by adopting calcium hydroxide with high mesh number through a chemical precipitation method, on one hand, OH <-> ions can be utilized to neutralize H < + > ions in the water to adjust the water to be neutral to meet the discharge requirement, and on the other hand, calcium ions and sulfate ions react to form gypsum which can be recycled, so that the environment is protected; and waste is reduced.

The invention discloses a porous aquifer modified plugging method based on sulfate radical solidification. The method is specifically implemented according to the following steps: step 1, determining a treatment target aquifer; step 2, analyzing and treating permeation characteristics of the target aquifer; 3, testing and treating the water quality of the target aquifer; 4, curing slurry containing sulfate radicals is prepared; 5, grouting drill holes are formed in a stepped mode in the direction of the water flow field; 6, after pH adjusting liquid is injected into the grouting drill holes, solidification slurry containing sulfate radicals is injected, and then a reinforcing agent is injected; and 7, the well is closed, standing is conducted for 48-72 hours, a stable filling body is formed through curing and curing, and then plugging effect inspection is conducted. The problems that in the prior art, crystallization particles of a chemical precipitation method are loose, and micropores cannot be effectively filled are solved.

A device and method for deep treatment of organic matter in reverse osmosis membrane filtration concentrate from coal chemical industry are disclosed. This invention relates to a device and method for treating membrane filtration concentrate, aiming to solve the technical problems of easy scaling, high energy consumption, and long treatment time in existing membrane filtration concentrate treatment methods. The device of this invention includes a heat exchanger, an advanced oxidation tank, an electrocoagulation coupled electro-oxidation tank, and a sedimentation tank connected in sequence. A persulfate dosing system is connected to the advanced oxidation tank. Simultaneously, the electrocoagulation coupled electro-oxidation tank and the sedimentation tank are connected to the advanced oxidation tank via reflux pipes. Through the combination of advanced oxidation and electrocoagulation coupled electro-oxidation, thermal activation and Fe... 2+ Ion activation generates sulfate free radicals, which react with existing chloride ions to produce active chlorine. This oxidizes and degrades recalcitrant organic matter in the reverse osmosis concentrate, reducing scaling problems in subsequent evaporation and crystallization systems and completely separating organic matter from the crystalline salt. This invention can be used in the field of wastewater treatment.

The application relates to a method for selectively leaching silver in zinc leaching residue by ultrasonic reinforced persulfate oxidation, and belongs to the technical field of hazardous solid waste resource utilization. The zinc leaching residue is dried and crushed to obtain zinc leaching residue powder; the zinc leaching residue powder is added into a sodium persulfate solution, and ultrasonic reinforced leaching reaction is carried out under the action of ultrasonic waves at a temperature of 50-80 DEG C for 60-180 min, solid-liquid separation is carried out, and leaching residue rich in valuable metals and silver-containing leaching solution are obtained. The application innovatively utilizes sodium persulfate to generate high-oxidation-activity sulfate radicals under the action of ultrasonic waves and in-situ release of Ag + Under the action of double activation, high-oxidation-activity sulfate radicals are generated, a continuous strong oxidation environment is formed, and the oxidation leaching of silver is significantly promoted; meanwhile, the method can selectively retain valuable metals such as zinc and iron in the form of oxides in the residue, realizes efficient separation of silver and synergic enrichment of valuable metals, and has the advantages of high silver leaching rate, fast leaching speed, simple operation, low cost, environmental friendliness and the like.

The invention provides a method and a system for targeted degradation of pesticide residues by cyclic regeneration free radicals, relates to the technical field of pesticide residue degradation, and aims to preferentially attack electron-rich groups in pesticide molecules by using sulfate free radicals excited by radiation to realize efficient and selective degradation of various organic pesticides. Oxidative damage to beneficial components in agricultural products and traditional Chinese medicinal materials is reduced to the maximum extent; positive pressure and negative pressure are alternately applied to the mixing kettle, so that a sodium persulfate solution is forced to fully permeate into an internal microstructure of a material, synchronous and advanced treatment of surface adsorption and internal pesticide residues is realized, and the problem that only surface pesticide residues can be treated by a traditional method is solved; according to the system, a closed-loop regeneration loop of sodium sulfate, sodium persulfate, sulfate free radicals and sodium sulfate is constructed; and the reacted solution can return to the pipeline type electrochemical reaction kettle to regenerate sodium persulfate, and the sodium persulfate is repeatedly utilized, so that the consumption of chemicals and the discharge of wastewater are greatly reduced, and the raw material cost and the environmental protection pressure are reduced.

The invention discloses a treatment method and system for thiophanate-methyl wastewater, and belongs to the technical field of wastewater treatment. The method comprises the following steps: firstly, carrying out primary oxidation by utilizing persulfate under an acidic condition to generate sulfate free radicals to destroy an organic matter structure; then, under ultraviolet irradiation, hydroxyl radicals are generated through excitation of an iron-based catalyst, and photocatalytic deep oxidation is carried out; separating a solid product through membrane filtration, and adsorbing residual small-molecular organic matters by using activated carbon with a high specific surface area; and finally, carrying out biodegradation on trace organic matters by adopting a specifically domesticated microbial flora. According to the integrated process, the removal rates of chemical oxygen demand, total organic carbon and suspended solids can reach 98.2%, 96.3% and 99.5% respectively. According to the technical scheme, through organic combination of chemical oxidation, photocatalysis, adsorption and biodegradation, efficient purification of thiophanate-methyl wastewater is achieved, and a reliable solution is provided for industrial wastewater treatment.