187 results about "Iron reduction" patented technology

The invention discloses a preparation method and application of efficient polyculture denitrification synergistic phosphorus removal filler, and belongs to the field of functional material development and sewage treatment. The method specifically comprises the following steps: step 1, uniformly mixing iron ore powder, sulfur powder and polyester high-molecular compound powder, and heating and melting; and 2, carrying out molding treatment on the molten substance, and cooling and solidifying to obtain the efficient polyculture denitrification synergistic phosphorus removal filler. According to the polyculture denitrification synergistic phosphorus removal filler disclosed by the invention, a polyester high-molecular compound is used as a supplementary electron donor of a sulfur-iron ore autotrophic denitrification synergistic phosphorus removal system, so that the nitrogen removal efficiency of denitrification is improved; the compound also can be used as an electron donor to participate in a ferrous sulfide reduction reaction, so that the discharge of sulfate in effluent is reduced, and enhanced phosphorus is removed in a form of Fe3 (PO4) 2 precipitate; meanwhile, heterotrophic denitrification generates alkalinity to make up the consumption of alkalinity in the autotrophic denitrification process, and the stability of pH in the system is maintained, so that the removal efficiency of nitrogen and phosphorus is enhanced, and secondary pollution is reduced.

The invention relates to a co-treatment process for high-iron red mud and various carbon-containing solid wastes. The co-treatment process comprises the working procedures of raw material preparation, ball pressing, drying and pre-reduction, iron reduction, titanium-silicon reduction, tailing treatment and the like. According to the method, the problems of low iron grade and high impurity aluminum content of a red mud iron recovery process are solved, the comprehensive utilization problem of other solid wastes and the utilization problem of tailings after extraction are synchronously realized, and the purpose of treating wastes with wastes is realized.

The invention provides a high-crystallinity modified iron oxide as well as a preparation method and application thereof, and relates to the technical field of organic solid waste treatment. The preparation method comprises the following steps: preparing a precursor MIL-88B by utilizing a hydrothermal method; the precursor MIL-88B is subjected to calcination treatment, and an iron oxide with the MIL-88B as the precursor is obtained; the temperature condition of the calcination treatment is 550-850 DEG C. The high-crystallinity modified iron oxide prepared by the preparation method improves methane production efficiency and stability, avoids competition of iron reducing bacteria, is stable in long-term operation and low in cost, and has both environmental and economic benefits.

The invention relates to the technical field of metallurgy, in particular to a process method for producing iron alloy through reduction of silver furnace dilution slag, which comprises the following steps of: 1, pretreating raw materials, namely crushing and levigating the silver furnace dilution slag, and crushing and screening a reducing agent; 2, mixing the pretreated raw materials, adding an additive, uniformly mixing, and adding the uniformly mixed mixture into a reduction furnace for reduction smelting; the tailings subjected to beneficiation dilution are selected, the dilution slag in the molten state is directly subjected to electric furnace reduction and is subjected to reduction smelting in the electric furnace, coke powder is adopted as a reducing agent, the dilution slag is added, the reduction rate of iron reaches 97% or above, the reduction rate of copper reaches 95% or above, and the iron content of the obtained alloy is 86% or above; the iron alloy can be sold as pig iron, and the depleted electric furnace slag contains more than 50% of silicon dioxide and can be used as a raw material for producing cement, so that zero emission of the smelting furnace slag, efficient utilization of high-temperature heat energy and low-cost production are realized.

The invention relates to the technical field of sewage treatment and resource utilization, in particular to a method for recovering phosphorus from sludge, which comprises the following steps: carrying out anaerobic digestion on the sludge to be treated under anaerobic conditions to release phosphorus in the sludge into supernate to obtain sludge anaerobic digestion liquid, adding an iron salt coagulant into the sludge anaerobic digestion liquid, precipitating, filtering, washing and drying to obtain the phosphorus-containing sludge. Removing phosphorus from the supernate, enabling the phosphorus to enter a precipitate, and removing the supernate to obtain a solid-liquid mixture; and adding the solid-liquid mixture into a reactor, adding a mixed bacterial agent of iron reducing bacteria and metal-resistant bacteria into the reactor, reducing ferric iron into ferrous iron under the action of the iron reducing bacteria, dissolving the precipitate, and recrystallizing to obtain the blue iron ore, thereby realizing the recovery of phosphorus in the sludge. According to the invention, ferric salt precipitates are re-induced to precipitate and recrystallize, so that the problems of low phosphorus load, large volume, low economic benefit of direct recovery, low crystallinity of chemical precipitates, more impurities, difficulty in controlling dissolved oxygen and easiness in oxidation at present are solved.

The invention discloses an organic wastewater advanced treatment method and device with low agent input. The method comprises the following steps: an anaerobic biological iron-sulfur reduction reaction process: fully mixing elemental sulfur, ferric iron, iron-sulfur reduction sludge and wastewater containing organic carbon and organic pollutants with electronegative groups, carrying out anaerobic biological elemental sulfur reduction and iron reduction reactions, and directionally generating polysulfide and ferrous sulfide in situ; a nucleophilic substitution reaction process: carrying out nucleophilic substitution reaction on the organic pollutants with the electronegative groups and the polysulfide, and removing the electronegative groups to generate a reduced organic product; in the oxidation reaction process, ferrous sulfide reacts with dissolved oxygen to generate hydroxyl free radicals, the reduction state organic product is oxidized and degraded, and elemental sulfur and ferric iron are generated; and a sludge precipitation process: refluxing the precipitate to the anaerobic biological iron-sulfur reduction reaction zone, and discharging clarified water. The method provided by the invention realizes deep degradation and detoxification of refractory organic pollutants, and has the advantages of low agent investment, low cost and no secondary pollution.

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 present invention provides a Fenton iron sludge treatment method and device, comprising the following steps: allowing the Fenton iron sludge to enter an iron reduction unit, undergoing reduction treatment under the action of dissimilatory iron-reducing bacteria, reducing the trivalent iron in the Fenton iron sludge to divalent iron through the reduction treatment to obtain reduced iron sludge; allowing at least a portion of the reduced iron sludge to enter a bioleaching unit, undergoing bioleaching treatment under the action of specific microorganisms to obtain a first mixed liquid; dehydrating the first mixed liquid to obtain an aqueous phase and dehydrated sludge, respectively; and returning the aqueous phase to the bioleaching system to participate in the bioleaching treatment. The present invention can solve technical problems existing in the prior art, such as the need for additional acid, the generation of a large amount of strongly acidic water, the susceptibility to environmental pollution, the inability to recycle iron, and high costs.

The present invention belongs to the technical field of iron-containing solid waste exploitation and microorganisms and specifically provides a method for using composite microorganisms to improve the gelling performance of iron-containing solid waste by. The provided method involves treating iron-containing solid waste with iron reducing bacteria, Bacillus aceticus, and Bacillus mucilaginosus. Under the combined action of the iron reducing bacteria, Bacillus aceticus, and Bacillus mucilaginosus, the dissolution of ions such as iron, calcium, and magnesium from the iron-containing solid waste can be accelerated, and the carbonization strength of the iron-containing solid waste is improved, so that the strength of the iron-containing solid waste as a gel material is significantly improved. It can be seen from the disclosure of the embodiments that by means of the provided method for improving the gelling performance of iron-containing solid waste, the demolding strength and the carbonization strength of iron-containing solid waste such as steel slag, stainless steel slag, and nickel slag are significantly higher than those in the prior art.

The invention discloses an organophosphorus degradation and synchronous recovery system based on a double-cathode induced electro-Fenton reaction. An induced iron electrode plate and an electrochemical assembly with double cathode plates are arranged in an electrolytic tank; the double cathode plates are a gas diffusion cathode plate and an iron reduction cathode plate; the gas diffusion cathode is used for reducing oxygen to generate hydrogen peroxide, the induction iron electrode releases ferrous ions under the action of an electric field, the ferrous ions and the hydrogen peroxide are subjected to a Fenton reaction, organic phosphorus is degraded into PO4 < 3->, Fenton reaction by-products Fe < 3 + > and PO4 < 3-> form iron phosphorus precipitates, and degradation of the organic phosphorus and synchronous recovery of orthophosphate are realized; excessive Fe < 3 + > is adsorbed by the iron reduction cathode and is further reduced into Fe < 2 + > which enters the solution again to participate in the Fenton reaction, so that the reaction efficiency is improved, and Fe < 3 + > / Fe < 2 + > circulation is promoted while slow release of iron is realized. The device is simple in structure, low in maintenance cost and high in operability, and the purpose of efficiently recycling phosphorus resources is achieved.

The invention discloses a preparation method of a zero-valent iron reduction material with micro-nano size and water stability, and belongs to the field of underground water pollutant degradation materials. The method comprises the following steps: 1) uniformly mixing micron-sized zero-valent iron powder and hexadecyl trimethoxy silane, and carrying out mechanical ball milling; and 2) cleaning the material with a cleaning agent, and drying to obtain the zero-valent iron reduction material with micro-nano size and water stability. According to the preparation method, a mechanical ball milling method and a hexadecyl trimethoxy silane surface modification method are utilized to cooperate, so that micro-nano size and surface hydrophobicity of the zero-valent iron are stabilized, agglomeration and passivation of the zero-valent iron in water are inhibited, and the reduction activity and water stability of the zero-valent iron material are improved; the reducing capacity of the material on pollutants such as halogenated hydrocarbon and heavy metal in water is remarkably improved, the material can be kept stable in water for a long time, the technical problems that the micro-nano zero-valent iron reducing material is prone to inactivation and difficult to store are solved, and waste of material resources can be reduced.

The invention relates to the technical field of mine waste liquid treatment, in particular to a method for treating acid mine waste water containing iron ions. The method comprises the following steps: carrying out reduction reaction on acid mine wastewater containing iron ions by using an iron-containing reducing agent to obtain a mixture; carrying out solid-liquid separation on the mixture to obtain a ferrous ion solution; performing membrane treatment on the ferrous ion solution to obtain a concentrated solution; and carrying out crystallization reaction on an alcohol solventing-out agent, a ferrite seed crystal and the concentrated solution to obtain crystal slurry containing ferrite crystals. According to the method, reduction reaction, solid-liquid separation, membrane treatment and crystallization reaction are combined, so that the purity of an iron product obtained by treating the acid mine wastewater containing iron ions can be synchronously improved to 95% or above, and the recovery rate can be synchronously improved to 94% or above.

The invention relates to a large-scale industrial development method for low-grade complex secondary copper sulfide ore, and belongs to the field of mineral engineering. According to the method, ores with different clay contents are classified, raw ores of high-clay ores are directly heaped, the permeability of ore heaps is improved, low-clay ores are crushed and heaped, and the ore leaching rate is increased; aiming at the problem of high pyrite content, pile sealing is performed in advance to control pyrite oxidation, biological population regulation and control are performed to inhibit pyrite oxidation, a solution is reasonably dispatched to reduce acid, copper rainwater is discharged to the bottom of a mining pit to be stored, and after rainwater in the pit is diluted, the pH is increased, and Fe < 3 + > generates precipitate to settle at the bottom of the pit, so that the iron and acid reducing effect is achieved, and environmental protection accidents are reduced.

The invention discloses a method for efficiently extracting iron from copper slag through non-molten hydrogen reduction, and belongs to the technical field of green resource utilization of metallurgical solid waste. Hydrogen is introduced to carry out reduction roasting on copper slag pellets, and a reduction auxiliary is added in a matched mode to dissociate fayalite in the copper slag; the purposes of strengthening the hydrogen reduction effect and improving the metal iron reduction rate are achieved, magnetite, fayalite and iron elements in other iron-containing silicate phases in the copper slag are reduced into metal iron, meanwhile, reduction products are treated through ore grinding and magnetic separation, and the iron ore concentrate grade is effectively improved. The method has the characteristics of simple reduction process and low carbon emission, and has high economic benefits.

The present invention relates to a method for recovering iron from sulfuric acid slag, the method comprising the following steps: mixing and fine-grinding the sulfuric acid slag with a reducing agent to obtain a mixture with a particle size of less than 300 μm; drying the mixture after shaping, then reducing it in a hydrogen atmosphere, and cooling it to obtain a reduced material; crushing the reduced material to a particle size of less than 200 μm, and recovering metallic iron by a mineral processing method. The method provided by the present invention uses hydrogen for reduction, the hydrogen has high selectivity, a clear reduction pathway, and a high metal recovery rate, and can reduce the complex iron components in the sulfuric acid slag to metallic iron, realizing resource utilization in the sulfuric acid slag while reducing carbon emissions, and the tailings after iron recovery can be further used to extract valuable metals, realizing the green and sustainable development of sulfuric acid slag utilization.

The invention relates to the technical field of concrete, and particularly discloses a modification method of volcanic ash active coal gangue. The invention relates to a coal gangue volcanic ash activity modification method, which comprises: (1) calcining coal gangue at a high temperature, crushing, and screening for spare; (2) preparing an iron reducing bacteria solution, namely activating an iron reducing bacteria strain, centrifuging the bacteria solution with good transfer growth vigor under the condition of 4000-5000r / min for 5-10 minutes, washing with sterile normal saline for 3 times, adding the sterile normal saline, resuspending and preserving for later use; and (3) dipping: mixing and uniformly stirring the crushed and screened coal gangue with an iron reducing bacteria solution, dipping for 30-40 minutes, taking out the dipped coal gangue, cleaning, and drying to obtain the modified coal gangue. The method can be used for coal gangue modification treatment, and the application range of coal gangue is widened.

The invention discloses a mariculture area bottom mud aging degree identification and restoration method, belongs to the technical field of aged bottom mud restoration, can quantitatively evaluate the aging degree of mariculture bottom mud by using sulfide, heavy metal and organic carbon as indexes, and solves the problem that the current aging judgment standard does not have a unified standard. A scientific basis is provided for repairing the aged bottom mud and evaluating the repairing effect; meanwhile, the developed iron-reducing flora loaded nZVI / S composite material (DIRB at nZVI / S) can be used for removing sulfides, heavy metals and organic matters in the mariculture bottom mud in an immobilization manner by utilizing a physical-chemical-biological combined effect, so that effective repair of the aged mariculture bottom mud is realized.

This application proposes a method for enhancing the smelting of iron-based minerals in a molten pool. The method includes introducing a first reducing agent, fuel, and oxygen-enriched gas into a jet melting zone to melt the added iron-based minerals and flux, and partially pre-reducing the molten slag, with weakly reducing flue gas being discharged. The molten slag then enters a jet reduction zone, where a second reducing agent is added, and fuel and oxygen-enriched gas are submerged and injected into the zone, initially reducing the molten slag to produce molten iron, iron-containing slag, and strongly reducing flue gas. The strongly reducing flue gas is treated to obtain CO gas, which is then pressurized and introduced into the jet melting zone; and / or, the CO gas is pressurized and introduced into the jet reduction zone. This application can effectively process iron-containing minerals and low-sulfur iron-containing slag, and features efficient iron reduction, efficient energy recycling, and low cost.

The present application relates to the technical field of soil remediation, and discloses a composite microbial inoculum for activating reverse conversion of oxidized iron in dry land soil and application thereof.The composite microbial inoculum comprises aerobic iron-reducing bacteria and phenazine electron shuttles.The present application mediates the aerobic iron-reducing process of the aerobic iron-reducing bacteria strain through the phenazine electron shuttles, significantly improves the electron transfer efficiency, enhances the iron-reducing capacity, and can efficiently generate high-activity weak-crystalline iron oxide under aerobic conditions, thereby breaking through the limitation of traditional iron reduction relying on anaerobic environment;by promoting the reverse conversion of high-crystalline oxidized iron to weak-crystalline oxidized iron, the mineral interface activity is improved, the fixation capacity for Cd, Pb, As and other multi-metals in dry land soil is significantly enhanced, the biological availability thereof is reduced, the biological toxicity and migration risk thereof are greatly weakened, the remediation process is stable, the risk of secondary pollution is low, and the present application has good application prospect and popularization value in the field of heavy metal contaminated soil remediation.

The invention relates to a synergistic extraction and recovery method of biodegradable plastic and blue iron stone for sewage treatment, which is characterized in that efficient recovery of biodegradable plastic and blue iron stone is realized by utilizing microbial metabolism by constructing a reaction mode of double electron acceptor supply under anaerobic-aerobic alternate reaction. The method comprises the following steps: firstly, selectively domesticating biodegradable plastic synthetic bacteria and dissimilatory iron reducing bacteria; in the anaerobic stage, Fe < 3 + > in the sewage is reduced into Fe < 2 + > by the dissimilatory iron reducing bacteria, the Fe < 2 + > reacts with phosphate to form blue iron stone, and a carbon source is converted into intracellular biodegradable plastic by the biodegradable plastic synthetic bacteria; in the aerobic stage, the biodegradable plastic synthetic bacteria utilize part of biodegradable plastic as electron donors to supply energy to microorganisms, the activity of the biodegradable plastic synthetic bacteria is maintained, and the biodegradable plastic synthetic bacteria are further enriched. According to the invention, by adjusting the mode of supplying the double electron acceptors in stages, the biodegradable plastic and the blue iron stone can be recovered in the same reactor at the same time, and the resource utilization efficiency is improved.

The invention relates to the technical field of preparation of environmental functional materials, and discloses a directional synthesis method of magnetic porous iron-doped graphitized biochar, which is realized by the following steps: cooperatively inducing low-temperature graphitization by utilizing a biomass endogenous S < 2 > self-template and nano-diamond; performing double-complexing ultrasonic impregnation on the iron precursor to realize nanoscale dispersion; performing staged pyrolysis, pre-carbonizing in an inert atmosphere to construct a carbon skeleton, and synchronously completing iron reduction and graphitization in a reducing atmosphere; performing mixed pickling to synchronously remove the template and construct a passivation layer; and finally, carrying out magnetic separation to obtain the high-porosity and uniformly iron-doped magnetic graphitized charcoal. A graphitized porous structure is realized through cooperation of a low-temperature self-template and nano-diamond, iron agglomeration is inhibited through a double-complexing ultrasonic technology, a protective layer and active sites are synchronously constructed through mixed pickling and passivation, and three technical barriers of high-temperature collapse, iron particle inactivation and short cycle life of a traditional process are broken through.

The invention discloses an advanced treatment and recycling method for lead-zinc beneficiation wastewater based on biological reduction, and belongs to the technical field of beneficiation wastewater treatment.The method comprises the following steps that the lead-zinc beneficiation wastewater is sequentially subjected to flocculent precipitation and CO2 hardness reduction pretreatment, heavy metal and COD removal through a bioelectrochemical system, methanol generation and advanced oxidation deep COD removal; and neutralizing, precipitating and removing iron and sulfate radicals to obtain treated water, and carrying out dissimilatory iron reduction treatment on the water-containing iron sludge for advanced oxidation. According to the method, CO2 and iron resources can be recycled, COD and heavy metal in the wastewater are deeply removed, the hardness and sulfate radicals are remarkably reduced, and the treated water can be completely recycled to a mineral separation procedure or discharged after reaching the standard.

The present application belongs to the technical field of soil environment regulation, and particularly relates to a paddy soil carbon fixation and emission reduction regulation method based on a ferrihydrite-organic matter complex. The ferrihydrite-organic matter complex is prepared through coprecipitation, the mineral combination degree of organic carbon in soil is improved, and the biological availability thereof is reduced, so as to alleviate the process of organic carbon decomposition and greenhouse gas emission mediated by microorganisms. Under the condition of redox fluctuation, the complex can maintain good structural stability, slow down the process of iron reduction and dissolution and the process of organic carbon release accompanying the same. In addition, the ferrihydrite as an electron acceptor can participate in the electron competition process under anaerobic conditions, so as to inhibit the production of methane to a certain extent. Therefore, the ferrihydrite-organic matter complex can realize the synergistic regulation of organic carbon stabilization and greenhouse gas emission reduction in paddy soil.

The invention discloses a preparation method and application of an electrode of bioelectrochemical equipment. The method comprises the following steps: S1, pretreatment; s2, preparing a polyvinyl alcohol solution; s3, preparing electrode slurry; s4, coating is carried out; and S5, drying. The electrode is used for treating chlorophenol wastewater. The electrode provided by the invention is prepared by modifying zero-valent iron, is arranged in an anode region of a bioelectrochemical reactor, and can effectively regulate and control oxidation-reduction potential, strengthen electron transfer between iron reducing bacteria and acetogenic bacteria at an anode and enrich acetogenic flora by loading trace zero-valent iron, so that the yield of acetic acid in an acidogenic phase is increased; the synchronous pollutant removal and methane yield increase are realized, and the economic benefit is improved.

The application discloses a method for promoting paddy field biological nitrogen fixation based on long-distance electron transfer, and comprises the following steps: S1, soil pretreatment, establishing a flooding system; S2, pre-incubation to form a stable redox stratification; S3, constructing a long-distance electron transfer channel; S4, cultivation: under the conditions of flooding and a certain temperature, continue to cultivate to promote the paddy field biological nitrogen fixation in the flooding system. The application does not need an external power supply, only by arranging a graphite rod in the flooded paddy field soil, making it span the surface layer oxidation zone and the lower layer reduction zone, forming a long-distance electron transfer channel, thereby realizing the directional transport and utilization of the lower layer reduction equivalent to the surface layer, providing continuous support for the surface layer nitrogen fixation process from the electron supply end, promoting the nitrogen fixation process, and also promoting the enrichment of paddy field biological nitrogen fixation related microbial groups in the surface layer oxidation zone and changing the iron valence state distribution, promoting the transformation of Fe(III) into Fe(II), and enhancing the coupling of iron reduction and nitrogen fixation process.

The invention relates to the field of solid waste recycling, and discloses a method for recovering titanium nitride by reducing red mud with aluminum ash. The method comprises the following steps: mixing aluminum ash with red mud and waste glass, roasting in an inert atmosphere by taking aluminum nitride in the aluminum ash as a reducing agent and the waste glass as a reaction accelerant, and reducing titanium dioxide and ferric oxide in the red mud into titanium nitride and metallic iron; carrying out crushing and magnetic separation on the roasted material to separate out a magnetic material and non-magnetic slag; and melting the magnetic material, and casting by a filter screen to obtain titanium nitride and iron alloy. According to the invention, aluminum nitride in the aluminum ash is used as a reducing agent, ammonia pollution caused by hydrolysis of aluminum nitride is avoided, and carbon emission of reduced titanium and iron is reduced at the same time; titanium and iron in the red mud are reduced into titanium nitride and iron alloy, and titanium and iron resources in the red mud are recycled. According to the method, the red mud is co-processed by the aluminum ash, low-carbon high-value utilization of the solid waste is realized, and the method has the advantages of short process, no pollution and easiness in industrialization.

The application discloses a kind of indium direct extraction production process without waste water discharge, belong to rare and dispersed metal hydrometallurgy technical field.The process is reduced roasting, low acid leaching, trivalent iron reduction, two-stage filter after containing indium material, through P204 solvent extraction, dilute sulfuric acid pickling, hydrochloric acid stripping to obtain indium-rich stripping solution, then by neutralization purification, zinc sheet replacement, refined ingot preparation refined indium product;The application constructs full-process wastewater cascade closed-circuit circulation system, and the raffinate returns the front end leaching process after pretreatment for reuse, and the organic phase regeneration liquid and the washed chlorine liquid are closed-circuit circulated in the extraction system, and the displacement liquid is returned to the production system after neutralization treatment, and the whole process slag percolate is collected and entered into the circulation system, and the impurity dynamic control mechanism is used to maintain the system stability.The process completely eliminates the production wastewater discharge, greatly reduces the fresh water consumption and environmental protection operation cost, reduces the loss of valuable metals, and can be based on the existing production line modification, and is suitable for various indium-containing raw materials.

The invention provides a composite repairing agent capable of synchronously removing heavy metal cadmium and neonicotinoid pesticides and a preparation method and application of the composite repairing agent. The composite repairing agent comprises a functional fungicide and iron minerals, and the ratio of the dry weight of the iron minerals to the volume of a fungicide liquid of the functional fungicide is 1: (1-10); the functional microbial agent is a viable bacterium culture of dissimilatory iron reducing bacteria, the thallus concentration of the functional microbial agent is not lower than 1 * 10 < 8 > CFU / mL, and the iron mineral is Fe2O3.nH2O. According to the method, an iron reducing bacteria-ferrihydrite mixed system formed by in-situ active minerals is constructed, efficient treatment of combined pollution is achieved through an adsorption-conversion-degradation synergistic mechanism, and ferrihydrite is converted into magnetite in situ within 24-72 hours through iron reducing bacteria in the iron reducing bacteria-ferrihydrite; the new magnetite shows excellent dual functions, and the removal rate of Cd can be increased to gt by crystal lattices of the new magnetite through obligate adsorption and coprecipitation; meanwhile, structural ferrous iron is used as a strong reducing agent and can efficiently attack nitryl in imidacloprid molecules, and gt, gt, gt, gt, gt, gt and gt are achieved; the degradation rate is 90%.

This invention discloses a modified sepiolite-iron-reducing bacteria composite agent, its preparation method, and its application, belonging to the field of water pollution remediation technology. The modified sepiolite-iron-reducing bacteria composite agent is composed of modified sepiolite and iron-reducing bacteria; the modified sepiolite is formed by loading iron-magnesium co-hydroxide onto the sepiolite. This composite agent exhibits high selectivity and good removal effect for phosphorus in phosphorus-polluted water bodies, facilitating the achievement of phosphorus removal in a relatively short time, and enabling the recovery of phosphorus resources in a reusable form, generating economic added value.

The invention relates to the technical field of nano zero-valent iron wastewater treatment, and discloses a method for in-situ regeneration and inactivation of nZVI through electron beam irradiation and a nano zero-valent iron membrane, the electron beam irradiation and the nano zero-valent iron (nZVI) membrane are cooperated to construct a green long-acting treatment system for Cr (VI)-containing wastewater: the wastewater is controlled to flow through a high-dispersion nZVI membrane in a thin-layer advection mode, and the Cr (VI)-containing wastewater is subjected to in-situ regeneration and inactivation; and meanwhile, electron beam irradiation is received, strong reducing particles such as hydration electrons (eaq-) and hydrogen free radicals (. H) generated by irradiation can carry out in-situ reduction on inactivated nZVI, Fe (0) or part of Fe (II) can continuously play a reducing role, and the long-acting effect of the system for treating Cr (VI)-containing wastewater is achieved together with synchronous intensified reduction of irradiation on Cr (VI). According to the method, the wastewater treatment capacity in unit time can be remarkably improved, meanwhile, the irradiation energy consumption and the nZVI use amount are reduced, efficient circulation of the iron reduction effect is achieved, and iron sludge pollution is greatly reduced.