246 results about "Fenton oxidation" patented technology

The invention belongs to the field of sludge treatment, and discloses a method for improving the dewatering performance of sludge through composite pretreatment, which comprises the following steps: (1) adding high-valence metal salt or high-valence metal salt polymer into water-containing sludge to be dewatered, mixing and stirring to stabilize the pH value of the system at 3-5; (2) adding transition metal salt into the system and stirring; the use amount of the transition metal salt is 2-15% of the weight of the dry basis of the sludge; (3) adding an oxidizing agent into the system, stirring, and carrying out filter pressing and dehydration to obtain a dehydrated mud cake; the using amount of the oxidizing agent is 2-30% of the weight of the dry basis of the sludge. According to the method, the flow design of the treatment method is improved, the pH value of the sludge is reduced by using the high-valence metal salt, then the sludge is conditioned by using the transition metal salt and the oxidizing agent, and meanwhile, the dosage of the oxidizing agent is controlled, so that the problems of too high cost and excessive oxidation caused by separate Fenton oxidation conditioning or ultrasonic-acidification-Fenton combined conditioning can be solved.

The invention discloses a quality-divided treatment and recycling method for lead-zinc beneficiation wastewater, and belongs to the technical field of beneficiation wastewater treatment.The method comprises the steps that beneficiation tail water is introduced into a Fenton reaction tank, a catalyst is added firstly, then hydrogen peroxide is added, a Fenton oxidation reaction is conducted, after the Fenton oxidation reaction is finished, the beneficiation tail water is introduced into a coagulation reaction tank, caustic soda liquid is added, and the mixture is stirred and mixed uniformly; adding a precipitating agent, a flocculating agent and a stabilizing agent, and flocculating and settling the precipitate; introducing the beneficiation tail water added with the treatment agent into a honeycomb inclined tube sedimentation tank, further flocculating and settling, then returning flocculated precipitates in a bottom tank to a coagulation reaction tank, and discharging redundant bottom mud into a tailing pond; and settled clear water enters a clear water tank and is used as production water for ore grinding classification and flotation operation. According to the invention, through quality-divided treatment-quality-divided recycling of the beneficiation wastewater, it is ensured that the beneficiation tail water meets the requirements of ore grinding and flotation production indexes, the treatment cost of concentrate overflow water and filtered water is reduced, and the purpose of 100% recycling of the beneficiation wastewater after quality-divided treatment is achieved.

The invention provides a technical application method for strengthening oxidation performance of Fenton reaction by a defect-rich carbon-based cocatalyst, and relates to the technical field of advanced oxidation catalysts for sewage treatment. Zinc nitrate and 2-methylimidazole are assembled in a methanol solution through a template method, a ZIF-8 material is obtained after centrifugal cleaning, the ZIF-8 is further carbonized through pyrolysis, Zn element is evaporated in the pyrolysis process, a porous and defect-rich carbon-based cocatalyst is obtained, the porous and defect-rich carbon-based cocatalyst is introduced into a Fenton oxidation system, circulation of Fe < 3 + > / Fe < 2 + > in the Fenton reaction can be efficiently promoted, and the catalytic activity of the catalyst is improved. Fe < 2 + > regeneration is enhanced, and the generation capability of active species of a Fenton reaction system is enhanced, so that the removal efficiency of pollutants in water is improved.

The invention discloses an industrial wastewater treatment process, and belongs to the technical field of wastewater treatment.The industrial wastewater treatment process comprises the following steps that firstly, the pH value of wastewater is adjusted to be smaller than 5, microelectrolysis filler is added, and pretreated wastewater is obtained through stirring, standing and filtering; 2, carrying out Fenton oxidation treatment on the pretreated wastewater; according to the method, an iron-carbon micro-electrolysis-Fenton oxidation combined mode is adopted for treating the wastewater, the COD removal rate is high, granular iron-carbon filler (micro-electrolysis filler) used in the iron-carbon micro-electrolysis process has stable physical and chemical properties, and the long-term and efficient treatment effect can be guaranteed; according to the micro-electrolysis filler, the boron-nitrogen-doped carbon material is used for replacing a conventional carbon material, so that the treatment efficiency of the granular iron-carbon filler is improved, the treatment process can be better linked with a Fenton oxidation treatment process, and industrial treatment is facilitated.

The invention relates to a Fenton-like oxidation treatment method, in particular to application of a self-activated Fenton-like composite repair material, the composite repair material is CaO2 (at) Fe3O4 (at) BIP-BC, western blot biochar is used as a matrix, and magnetite and calcium peroxide are sequentially loaded on the surface of the matrix. Compared with the prior art, the method has the advantages that the high efficiency and the long-term effect of Fenton-like are improved through biochar surface active groups and calcium peroxide, the selectivity of removing target harmful bacteria and harmful bacteria genes is improved through western blot, and the activating agent and the oxidizing agent are added at the same time, so that the use cost and the operation complexity are reduced. According to the method, the defects that traditional Fenton-like oxidation treatment is poor in harmful bacterium and harmful bacterium gene obligate removal effect, short in treatment time, high in required dosage and serious in secondary pollution, and an activating agent and an oxidizing agent need to be used separately are effectively overcome; the efficient and long-acting remediation of soil and water bodies polluted by harmful bacteria and harmful bacteria genes through the Fenton-like reaction is realized.

The invention relates to the technical field of wastewater treatment, in particular to a catalytic reduction-oxidation reaction system and a wastewater treatment method, and the catalytic reduction-oxidation reaction system is used for treating wastewater. Comprising a water inlet unit, a pH stabilizing unit, a catalytic reduction reaction unit, a Fenton oxidation reaction unit, an aeration stripping unit, a neutralization unit, a coagulating sedimentation unit and an intelligent control system which are connected in sequence, the catalytic reduction reaction unit comprises a catalytic reduction reactor, a filter plate and a reaction layer are arranged in the catalytic reduction reactor, a supporting layer is laid on the filter plate, and the reaction layer is arranged on the supporting layer. The reaction layer is arranged on the filter plate through the supporting layer; the Fenton oxidation reaction unit comprises a Fenton oxidation reactor, the Fenton oxidation reactor comprises a reactor body, and a first rotary mixing aeration disc is arranged at the bottom in the Fenton oxidation reactor. By implementing the application, high-efficiency, stable, low-consumption and intelligent operation of wastewater treatment can be realized.

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 invention relates to the technical field of wastewater treatment, and discloses an efficient and environment-friendly photo-Fenton oxidation wastewater treatment method which comprises the following steps: performing primary treatment on wastewater through a water inlet and pretreatment unit to remove large-particle impurities; a flocculating agent is added through the flocculation treatment unit to further remove suspended solids; organic matters are efficiently degraded by utilizing ultraviolet light catalysis and a Fenton reagent through the photo-Fenton reaction unit; solid-liquid separation is realized through the separation and drainage unit, and wastewater is discharged after reaching the standard; system operation parameters are monitored in real time and automatically adjusted through the monitoring and control unit, and the treatment effect is ensured; large-recycle-ratio operation is achieved through the recycle-ratio control unit, the reaction efficiency is improved, and consumption of chemical reagents is reduced. According to the method, ultraviolet light catalysis and Fenton reaction are combined, efficient degradation of refractory organics in the wastewater is achieved, and meanwhile through the intelligent control and cyclic utilization technology, the treatment efficiency is improved, and the operation cost is reduced.

The utility model discloses a nano-iron carbon micro-electrolysis and Fenton oxidation integrated reactor, which comprises a nano-iron micro-electrolysis tank, a Fenton oxidation tank, a neutralizing tank, a degassing tank, a coagulating tank, a flocculation tank and a sedimentation tank which are sequentially connected through internal pipelines, the nano-iron micro-electrolysis tank is connected with a water inlet pipe, and the sedimentation tank is connected with a water outlet pipe and a sludge discharge pipe; sewage sequentially passes through the nano-iron micro-electrolysis tank, the Fenton oxidation tank, the neutralization tank, the degassing tank, the coagulation tank, the flocculation tank and the sedimentation tank in a step-by-step self-flowing manner; aeration devices are respectively arranged in the nano-iron micro-electrolysis tank, the Fenton oxidation tank, the neutralization tank, the degassing tank, the coagulation tank and the flocculation tank, the aeration devices are liftable aeration devices, and the aeration devices are connected with an external air source through aeration pipelines. The utility model relates to a nano iron-carbon micro-electrolysis Fenton oxidation integrated reactor, which is integrated equipment, and solves the problems of larger occupied area and higher investment caused by the fact that traditional Fenton and micro-electrolysis water treatment are generally divided into more functional monomers.

The invention discloses a low-cost treatment method for industrial high-salinity wastewater, relates to the technical field of wastewater treatment.The low-cost treatment method aims at solving the problems that the treatment effect is poor, membrane pollution is serious, the system watering rate is low and the process operation cost is too high, and comprises the following steps that the industrial high-salinity wastewater is injected into a first-stage Fenton oxidation reaction tank; h2O2 is added for an oxidation reaction; the industrial high-salinity wastewater is injected into a secondary Fenton oxidation reaction tank, and H2O2 is continuously added for an oxidation reaction; injecting the industrial high-salinity wastewater into a defluorination reaction tank, adding excessive calcium chloride, then adding a flocculating agent PAM, stirring and precipitating; taking supernate, injecting the supernate into a dechlorination reaction tank, adding calcium-aluminum salt for reaction, and adding a flocculating agent PAM into a reaction device at the same time; taking supernate, injecting the supernate into a flocculation sedimentation tank, adding calcium oxide and a flocculating agent PAM, stirring and mixing, and standing for sedimentation; taking supernate and injecting the supernate into a coke powder adsorption tank, and finally discharging the supernate out of the coke powder adsorption tank to obtain treated effluent.

The invention discloses an iron mud comprehensive recycling subsystem and method for industrial wastewater treatment, efficiency improvement and carbon reduction, and belongs to the technical field of wastewater treatment. The iron sludge comprehensive recycling sub-system is independent of the wastewater treatment main system and comprises an iron sludge pulping tank, a rotational flow system, a resettling system and a reductive iron sludge tank which are connected in sequence. The recycling method comprises the following steps: pulping filtered Fenton wet mud, then carrying out deep washing, efficient concentration and crude separation, and strategically applying the separated muddy water or mud to key working sections of a wastewater treatment main system, including an anaerobic biochemical system, a flocculation floatation tank, an iron ammonia oxidation MBR tank and a Fenton oxidation system. According to the method, the removal efficiency of pollutants such as organic matters, total nitrogen and total phosphorus in each application section can be obviously improved, the energy consumption, material consumption and carbon emission of a wastewater treatment main system are effectively reduced, the operation cost is reduced, and dual benefits of environmental protection and economy are realized.

The invention discloses a method for degrading bisphenol organic pollutants. The method comprises a preparation method of ferromanganese spinel with a rare earth doped particle structure and an application of the ferromanganese spinel and peroxymonosulfate in degrading the bisphenol organic pollutants by cooperating with a hydrodynamic cavitation technology. Mainly relates to combination of a Fenton-like oxidation technology and a hydrodynamic cavitation technology for activating peroxymonosulfate by using ferromanganese spinel with a rare earth doped particle structure. Comprising the following steps: activating persulfate through transfer electrons between surface defects and rare earth elements of prepared ferromanganese spinel with a rare earth doped particle structure under a hydrodynamic cavitation condition, so as to generate a large number of superoxide free radicals to degrade bisphenol organic pollutants. A rich gas-liquid interface provided by nano bubbles generated by hydrodynamic cavitation is combined, and the contact opportunity of active oxygen species and pollutant molecules is increased, so that the reaction rate and the degradation efficiency are improved. According to the method, efficient degradation of bisphenol organic pollutants is realized, and a green and efficient solution is provided for water treatment.

The invention belongs to the technical field of electroplating wastewater treatment, and particularly relates to acidic electroplating wastewater treatment equipment and process based on combination of Fenton oxidation and acid-resistant nanofiltration membrane separation. Considering that the acidic nickel plating wastewater not only can provide acidic conditions, but also has ferrous ions, based on this, the acidic nickel plating wastewater is used as a raw material and is mixed with the ferrous ions and hydrogen peroxide for a Fenton reaction, and then iron ions and nickel ions are separated by adopting a PP precision filter and an anti-high-turbidity ultrafiltration system. According to the method, iron ions are recycled after being reduced by an iron reduction reactor, nickel ions are separated by adopting an acid-resistant nanofiltration system, and the obtained nickel ions are subjected to electroplating and water recycling again, so that the technical defects existing in the traditional nickel plating wastewater treatment are overcome, and the utilization of the acidic nickel plating wastewater is realized.

The invention discloses a firework and cracker hazardous waste recovery treatment method and system, and the method comprises the following steps: a wastewater treatment step: the wastewater treatment step comprises a chemical precipitation step, an A2O biochemical treatment step, a Fenton oxidation step and a BAF biological filter step, and perchlorate, COD and heavy metal are removed; the waste residue treatment step comprises a wet grinding step, a high-temperature digestion step, a flotation step, a hydraulic cyclone separation step, a wet leaching step and a fractional precipitation step, and carbon powder, titanium, barium, aluminum and magnesium resources are recycled; according to a synergistic coupling mechanism, bottom slag generated in the wastewater treatment step is conveyed to the waste slag treatment step for treatment, and filtrate generated in the waste slag treatment step is conveyed to the wastewater treatment step for treatment. The method is used for carrying out harmless treatment and resource recycling on the hazardous wastes of the fireworks and crackers.

The invention relates to a method for removing heavy metal complexes in wastewater, which comprises the following steps: S1, preparing a PMS composite agent which is prepared by ball-milling the following raw materials in percentage by weight: 50-90% of persulfate, 5-30% of sulfite and 5-20% of pypocholoride; s2, the PMS composite agent obtained in the S1 is added into industrial wastewater containing a heavy metal complex, heavy metal in the heavy metal complex is Cu and one or more of Co, Cr, Ni, Pb and Zn, complex in the heavy metal complex is one or more of EDTA, NTA, citric acid, oxalic acid, tartaric acid and sorbic acid, the mixture is stirred and dissolved, alkali liquor is added to maintain the pH of the industrial wastewater to be 9.5-11.0, and the PMS composite agent is obtained after the reaction is completed. Carrying out Fenton-like oxidation complex breaking reaction, and carrying out post-treatment after the reaction is finished, so as to obtain the reclaimed water. According to the method, the purpose of removing the heavy metal complex in the wastewater by the in-situ activation of the persulfate is achieved under the condition of not additionally adding a catalyst or applying energy sources such as electricity, ultraviolet and the like.

The invention relates to a Fenton-like composite material, in particular to a self-activated Fenton-like composite repair material as well as a preparation method and application thereof, the composite repair material is CaO2 (at) Fe3O4 (at) BIP-BC, western blot biochar is taken as a matrix, and magnetite serving as an activating agent and calcium peroxide serving as a slow-release oxidizing agent are sequentially loaded on the surface. Compared with the prior art, the method has the advantages that the efficiency and the long-term effect of Fenton-like are improved through the biochar surface active groups and the calcium peroxide, the selectivity of removing target harmful bacteria and harmful bacteria genes is improved through western blot, and the biochar loads the calcium peroxide and the magnetite at the same time, so that an activating agent and an oxidizing agent are added at the same time; and the use cost and the operation complexity are reduced. The method overcomes the defects that the traditional Fenton-like oxidation treatment has poor obligate removal effect on harmful bacteria and harmful bacteria genes in the environment, the treatment time is short, the required dosage is high, the secondary pollution is serious, and an activating agent and an oxidizing agent need to be used separately.

The invention discloses a heat pump temperature control type plasma synergistic Fenton oxidation grading organic wastewater treatment system and method. The system comprises a first water pump, a plasma bubbling water treatment reactor, a Fenton-like oxidation reactor, an air pump, a high-voltage power supply, an evaporator, a first condenser, a compressor and a second condenser, by coupling Fenton reaction and realizing temperature control, low-temperature plasma heat energy and low-potential active oxide H2O2 are efficiently utilized to perform oxidative degradation on organic matters in a water body after plasma advanced oxidation reaction, and accurate temperature control in each stage of wastewater oxidation is realized so as to be beneficial to reaching the optimal temperature; due to the addition of a Fenton-like oxidation filler on the porous catalyst supporter plate, ferrous iron Fe < 2 + > in particles and H2O2 are subjected to a Fenton oxidation reaction to generate ferric iron Fe < 3 + > and. OH with strong oxidizing property to participate in organic matter degradation, and meanwhile, sensible heat in wastewater, electric heat provided by plasmas and chemical reaction heat in the plasma oxidation process are utilized through temperature control; the efficient degradation of industrial organic wastewater is favorably realized.

The invention discloses a thallium-containing wastewater treatment process which comprises the following steps: (1) introducing thallium-containing wastewater into a Fenton oxidation pond, adding a Fenton reagent, adjusting the pH value by using lime milk, carrying out HDS process treatment, and filtering to obtain pretreated thallium-containing wastewater; (2) electrolyzing the pretreated thallium-containing wastewater by adopting a BDD electrolytic bath to obtain electrolyzed thallium-containing wastewater; and (3) mixing the electrolyzed thallium-containing wastewater with polymerization ferric chloride, and treating by adopting an ion exchange system. The treatment process provided by the invention ensures that the thallium concentration in the water body is continuously and stably reduced to an environmental limit value, and meets the emission standard of GB 3095-2012.

The invention relates to an iron drum and plastic drum hazardous waste recycling sewage treatment method based on sectional oxidation and dynamic regulation and control. The method comprises the following steps: S1, strong alkali wastewater treatment; s2, comprehensive wastewater physicochemical pretreatment; s3, selecting a wastewater treatment mode; s4, a high-load working condition mode; s5, sludge treatment. The method is scientific and reasonable and convenient to operate, the nutrient solution adding module is additionally arranged in front of the anaerobic UASB unit to activate the activity of microorganisms, and the subsequent Fenton oxidation load is reduced; the multi-mode switchable technological process adapts to the intermittent drainage characteristic of the hazardous waste project, the modes are automatically switched through the PLC control system, it is ensured that the water and electricity consumption per ton is smaller than or equal to 1.2 kWh and is reduced by 18% compared with a traditional process, and the energy consumption is reduced by 25% when the load is low; through segmented treatment, precise oxidation is achieved, the treatment cost of each ton of water is effectively reduced by 0.8-1.2 yuan, and social and economic benefits are remarkable.

The present application relates to a kind of methods for removing heavy metal complex in wastewater, comprising the following steps, S1 configuration PMS composite reagent, the PMS composite reagent is made by including the following weight percentage of raw material ball milling, persulfate 50~90%, sulfite 5~30%, hypochlorite 5~20%;S2 in the heavy metal complex-containing industrial wastewater join the PMS composite reagent obtained in the S1, heavy metal in heavy metal complex is Cu, and one or several of Co, Cr, Ni, Pb and Zn, complex in heavy metal complex is one or several of EDTA, NTA, citric acid, oxalic acid, tartaric acid, sorbic acid, stirring is dissolved, and lye is added to maintain the pH of industrial wastewater to 9.5~11.0, and carries out fenton-like oxidation and breaks the complex reaction, after reaction, aftertreatment is obtained, and the regenerated water is obtained.The present application achieves the purpose of removing heavy metal complex in wastewater by the method of in-situ activation of persulfate without additional catalyst or the application of electricity, ultraviolet and other energy.

The invention relates to the field of medical wastewater treatment, in particular to a medical wastewater treatment process based on combination of microelectrolysis and Fenton oxidation, which comprises the following steps: S1, pretreatment; s2, adjusting the pH value; s3, micro-electrolysis is carried out; s4, performing Fenton oxidation; s5, solid-liquid separation and resource recovery, in the step S1, the pretreatment comprises treatment of the medical wastewater through a coarse screen and a fine screen to obtain a pretreatment solution, and in the step S2, the pH adjustment comprises addition of an acid-base regulator to adjust the pH of the pretreatment solution to 2-3, and activation of micro-electrolysis reaction activity; the pH regulator is sulfuric acid, and in the step S3, the micro-electrolysis comprises the following steps: introducing the pretreatment liquid subjected to pH regulation into an iron-carbon micro-electrolysis tank, then adding a filler, carrying out a micro-electrolysis reaction, and carrying out aeration at the same time. The technology is mature, the emission standard can be met, micro-electrolysis in-situ Fe < 2 + > supply is achieved, waste is used for treating waste, hydrogen recovery and metal regeneration are combined, and a near-zero-emission closed-loop system is formed.

The invention provides a method for preparing fulvic acid through Fenton oxidation, and belongs to the technical field of fulvic acid preparation. The preparation method comprises the following steps: firstly, mixing a biomass raw material with water, and performing hydrothermal treatment to obtain a solid-liquid mixture; adding a Fenton reagent into the solid-liquid mixture, and then sequentially carrying out oxidation treatment, alkaline extraction and acidic precipitation to obtain a crude fulvic acid solution; and finally, purifying the crude fulvic acid solution to obtain the fulvic acid. According to the method, firstly, the biomass raw material is subjected to hydrothermal treatment, the hydrothermal treatment product is subjected to Fenton oxidation, hydroxyl free radicals (. OH) generated by a Fenton reagent effectively destroy C-C bonds and C-O bonds in the biomass structure, continuous decomposition and conversion of the hydrothermal product can be effectively promoted, generation of the target product fulvic acid is facilitated, the reaction time is shortened, and the yield is increased. And the production efficiency is improved.

The utility model discloses a Fenton oxidation reaction device which is characterized by comprising an iron-carbon reaction tank, a first Fenton oxidation tank and a second Fenton oxidation tank which are sequentially connected through a water pipe, iron-carbon filler is arranged in the iron-carbon reaction tank and filled with scrap iron and granular active carbon filler, and the first Fenton oxidation tank is connected with the second Fenton oxidation tank through a water pipe. The device has the advantages that ferrous sulfate is replaced by introducing the iron-carbon reaction tank, and the iron-carbon reaction tank is filled with articles which can be collected usually, so that the cost is lower than that of the ferrous sulfate; and the iron-carbon reaction tank can play roles in the following two aspects: 1, iron-carbon oxidation reaction is carried out on iron carbon and some substances in the wastewater to decompose part of organic matters, and 2, ferrous ions are generated after the reaction of sulfuric acid and iron and are provided for subsequent Fenton reaction, so that the wastewater purification cost of an enterprise is reduced on the whole, and the economic benefit of the enterprise is improved. And the purification discharge standard of the wastewater is improved.

The application discloses a preparation method and application of blue-green algae-based biochar with Fenton-like oxidation function. The preparation method comprises the following steps: (1) selecting an iron-containing flocculant, adding the iron-containing flocculant into natural lake water containing blue-green algae, and then performing sufficient stirring, standing, filtration, drying, crushing and sieving to obtain blue-green algae powder; (2) placing the blue-green algae powder in a tubular furnace for pyrolysis treatment to obtain preformed carbon; then, immersing the preformed carbon in an activating agent solution, performing sufficient immersion, drying, placing the preformed carbon in the tubular furnace for activation treatment, and finally performing heat treatment under air atmosphere to obtain blue-green algae-based biochar material with Fenton-like oxidation function. The application provides application of the prepared blue-green algae-based biochar in dye wastewater treatment, and the dye wastewater treatment is performed in the presence of hydrogen peroxide, and the blue-green algae-based biochar has high degradation removal rate and high stability.

The application discloses a method for recovering nickel and phosphorus from electroless nickel plating waste liquid, and the method comprises the following steps: preparing nickel sulfate through extraction and stripping, and preparing iron phosphate through Fenton oxidation and precipitation; compared with the prior art, the method is characterized in that the waste liquid is pretreated, insoluble solid particles in the waste liquid are removed, emulsification of an extractant caused by particles in a subsequent extraction process is prevented, damage to extraction oil is avoided, and the extraction efficiency is ensured; in addition, the extractant used in the method can be recycled, secondary pollution is avoided, and the method is economical and practical; in the method, main pollutants in waste water are all converted into important chemical raw materials, recycling is realized, sulfuric acid and Fenton reagents used are all converted into terminal products, difficulty of end waste water treatment is not increased, clean production is met, the treatment cost is low, the product has high added value, and the method has strong practicability.

The application discloses a method for repairing chlorinated groundwater pollution based on carbon dioxide nanobubbles, and the method is characterized in that nZVI, H2O2 and EDDS reagents are injected in a time sequence at different stages, and CO2 nanobubbles are used as a multifunctional medium throughout the process. The CO2 nanobubbles not only continuously remove the passivation layer through in-situ acidification, thereby fundamentally promoting the reduction effect of nZVI on chlorinated organic matter, but also couple a subsequent Fenton oxidation process, thereby greatly promoting the complete oxidation effect of toxic intermediates, effectively inhibiting the conversion of the final reaction product Fe 2+ Into secondary minerals, and controlling the risk of blockage from the source. Through the design of in-situ generation of catalyst Fe 2+ And the final removal of iron ions, the application maximizes the dosage of exogenous chemicals and the final residual, overcomes the environmental risks that may be introduced by traditional technologies or cause permanent physical damage, and realizes efficient, complete and sustainable repair of chlorinated organic pollutants in groundwater. 3+ ​

The invention relates to the technical field of industrial wastewater treatment, in particular to a treatment method for treating high-sulfonic-group wastewater by advanced oxidation, which comprises the following steps: regulating the pH value of the wastewater to 3.0-4.0, then carrying out photo-Fenton oxidation, controlling the molar ratio of H2O2 to Fe < 2 + > to be 300: 1-400: 1, regulating the pH value of the effluent to 5.0-6.0, adding sodium sulfite to quench residual H2O2 and flocculate and precipitate iron mud, and finally, carrying out secondary oxidation on the wastewater to obtain the high-sulfonic-group wastewater. Performing anaerobic-aerobic biochemical treatment on the supernate, adding sodium carbonate and sodium hydroxide into biochemical effluent to soften and descale, concentrating in a mechanical vapor recompression evaporator, washing and recrystallizing crystallized mother liquor, and adsorbing and purifying the crystallized mother liquor with activated carbon to obtain an industrial salt product. The problem of MVR evaporation scaling is effectively solved by accurately controlling the neutralization pH and combining the softening step, finally, wastewater standard treatment and salt high-quality recovery are achieved, the COD removal rate can reach 95% or above, and excellent environmental and economic benefits are achieved.

The invention provides a method for realizing zero sewage discharge of a 2, 5-diaminotoluene sulfate product, and belongs to the technical field of chemical engineering. Compared with the current method for applying part of wastewater (about 20 tons of wastewater is produced per ton of product) in a factory, the method for realizing zero sewage discharge of the 2, 5-diaminotoluene sulfate product comprises the following steps: extracting and recovering part of o-toluidine by using an extracting agent; the residual wastewater is subjected to Fenton oxidation and triple-effect evaporation to obtain wastewater meeting the discharge standard, and the wastewater is discharged to a sewage treatment plant, so that zero discharge of sewage can be realized.

The utility model relates to the technical field of wastewater treatment, in particular to a wastewater treatment agent adding device based on a Fenton oxidation method, and adopts the technical scheme that the wastewater treatment agent adding device comprises a feed box, bearings II are embedded into two sides of the feed box, fixing rods are fixedly mounted on inner rings of the two groups of bearings II, fluted discs are mounted at one ends of the two fixing rods, and the fluted discs are connected with the feed box. A quantitative conveyor is installed at the bottom of the material box, a fixing plate is welded to the position, on one side of the quantitative conveyor, of the bottom of the material box, a first bearing is installed on the fixing plate in an embedded mode, a fixing roller is fixedly installed on an inner ring of the first bearing, and paddles are installed on the outer side of the fixing roller in an annular array mode. The spraying device has the advantages that sprayed materials can be dispersed through the paddles, and the spraying range of the materials can be adjusted according to actual conditions.

The present invention discloses an industrial wastewater treatment process, which belongs to the field of environmental protection technology and sewage treatment technology. The organic matter in the industrial wastewater is concentrated by ultrafiltration equipment, the concentrated water is subjected to advanced oxidation treatment, the fresh water is subjected to biochemical treatment, and different process treatment methods are selected according to the acidity and alkalinity of the water quality. The reasonable combination of multiple processes to treat industrial wastewater can greatly reduce the amount of acid and alkali agents, avoid increasing the salt content, and reduce operating costs. Ozone oxidation is used to increase the dissolved oxygen in the water, combined with the Fenton oxidation system and the residual iron after iron-carbon micro-electrolysis treatment, so that Fe 3+ Under alkaline conditions, flocs are formed to promote the removal of organic matter while participating in the anaerobic nitrogen removal in the two-stage A / O treatment system, effectively removing ammonia nitrogen from the wastewater. The treated industrial wastewater quality meets the Class A standard of GB / T18918-2002 "Pollutant Discharge Standard for Urban Wastewater Treatment Plants".