81 results about "Potassium ferrate" patented technology

The invention discloses a potassium ferrate composite environmental remediation material as well as a preparation method and application thereof. The material comprises the following components in percentage by weight: 40-70% of potassium ferrate; 20-50% of a porous carrier; and 5-10% of a stabilizer. The preparation method comprises the following steps: S1, potassium ferrate synthesis: synthesizing potassium ferrate under the action of an auxiliary catalyst by adopting a sodium hypochlorite oxidation method; s2, modifying a porous carrier: activating the porous carrier with acid, soaking the porous carrier in a stabilizer solution, and drying for later use; and S3, composite loading: mixing the potassium ferrate powder and the porous carrier in proportion, then adding a binder, carrying out ball milling, then carrying out tabletting molding, and then carrying out calcination in an inert atmosphere to obtain porous composite particles, namely the environmental remediation material. The composite structure delays decomposition of potassium ferrate, and the validity period of the material is prolonged to 6 months or above. The porous carrier provides adsorption sites and cooperates with the oxidation-adsorption effect to improve the pollutant removal rate. The calcining process enhances the mechanical strength of the material, and is suitable for flowing water or deep soil injection.

The invention belongs to the field of electro-catalysis, and particularly discloses preparation and application of an efficient self-supporting bifunctional electrolytic alkaline seawater catalyst.The catalyst is of a self-supporting stable structure formed by loading FeOOH-NiAl-LDH of a nano-sheet structure on a foamed nickel framework, and the preparation method comprises the following steps that 1, a hydrothermal growth method is adopted, foamed nickel serves as a substrate, and the self-supporting stable structure is formed; the preparation method comprises the following steps: weighing nickel nitrate hexahydrate, aluminum nitrate nonahydrate and urea, dispersing in deionized water, uniformly stirring, transferring into a reaction kettle, keeping at 100-120 DEG C for 10-12 hours, naturally cooling, washing and drying; and (2) adopting a room-temperature dipping etching method, taking flaky sodium hydroxide, dissolving the flaky sodium hydroxide in deionized water, fully dissolving, adding potassium ferrate to form a purple-red FeOOH colloid, putting the NiAl-LDH electrode prepared in the step (1) into the colloid, and dipping and etching at the room temperature of 25 DEG C for 12-24 hours to obtain the FeOOH-NiAl-LDH electrode. The scheme is mainly used for preparing the electrolytic seawater catalyst, and the problem that a traditional self-supporting electrolytic alkaline seawater catalyst is unstable in structure is solved.

The invention provides a simultaneous oxidation and coagulation water treatment process and equipment, and belongs to the technical field of water treatment. According to the water treatment process, two water treatment methods of potassium ferrate oxidation and aluminum-iron covalent bond composite coagulant coagulation are integrated in one unit, the purpose of efficiently treating the organic arsenic wastewater is achieved through a synchronous oxidation and coagulation reaction, and floc generated by precipitation is refluxed and reused; and through synergistic adsorption, complexation and enhanced coagulation, organic matter degradation intermediates and inorganic arsenic are removed, and resource utilization and reduction of floc solid waste are achieved. Compared with a traditional pre-oxidation coagulation process, the synchronous oxidation coagulation reaction process constructed by the method disclosed by the invention has an obvious effect of removing pollutants by synergism and mutual promotion. Meanwhile, floc sludge flows back, the concentration of a flocculation medium can be increased, organic matter degradation intermediates and inorganic arsenic are removed through synergistic adsorption, complexation and enhanced coagulation, and waste reduction and efficiency improvement are achieved. The oxidation and coagulation integrated equipment provided by the invention is simple to operate, efficient, low in consumption, safe, green and environment-friendly.

The present invention relates to the technical field of nanopowder preparation, and discloses a method for preparing a nitrogen-doped biochar-loaded iron nitride composite material. The process is as follows: (1) potassium ferrate, urea, and waste tea powder are ground and mixed in proportion to obtain a first mixture; (2) the first mixture is reacted in a temperature range of 50-70°C to obtain a second mixture; (3) the second mixture is reacted in a temperature range of 600-800°C for 1-3 hours, and then cooled to room temperature to obtain a third mixture; (4) the third mixture is washed and dried to obtain a nitrogen-doped biochar-loaded iron nitride composite material. Compared with the existing preparation process, the beneficial effect of the present invention is that the operation steps only include grinding, stirring, heating, etc., the operation is simpler, the overall process only involves one pyrolysis, the energy consumption is lower, and the toxic gas ammonia is not used, and the operation is safer. The material can degrade trichloroethylene without an anaerobic environment and can be used for the remediation of organochlorine-contaminated groundwater environment.

The utility model relates to the technical field of water treatment equipment, and particularly discloses a potassium ferrate powder uniform feeding device which comprises a chemical feeding hopper, a detachable upper cover is arranged at the upper end of the chemical feeding hopper, a chemical feeding port and a first motor are arranged at the top of the upper cover, a first sealing cover is arranged on the chemical feeding port, and a second sealing cover is arranged on the first sealing cover. A stirring shaft located in the dosing hopper is connected to an output shaft of the first motor, a stirring rod is arranged on the side wall of the stirring shaft, a screen fixed to the dosing hopper is arranged below the stirring rod, a mounting cavity and a discharging channel communicated with the interior of the dosing hopper are arranged at the bottom of the dosing hopper, and a second motor and a vibration motor are arranged in the mounting cavity. A chemical feeding wheel is arranged in the discharging channel, an output shaft of the second motor is connected with the chemical feeding wheel, and a plurality of chemical grooves for containing potassium ferrate powder are evenly formed in the side wall of the chemical feeding wheel; according to the potassium ferrate powder adding device, quantitative and uniform adding of potassium ferrate powder is achieved, and the situation that all the potassium ferrate powder is directly scattered into sewage at a time, and consequently chemical waste is caused is avoided.

The invention relates to the technical field of wastewater treatment, and discloses a method for treating low-concentration fluorine-containing organic wastewater based on advanced oxidation-magnetic coagulation precipitation, which comprises the following steps: firstly, adding potassium ferrate into wastewater and stirring to promote the potassium ferrate to decompose to generate hydroxyl free radicals (. OH), oxidizing and degrading organic matters in the wastewater, and removing the organic matters in the wastewater; then adding a saturated sodium sulfite solution to quench the residual oxidant; and then adjusting the pH value of the wastewater, adding polyaluminum chloride, modified imidazoline and Fe3O4, stirring, standing, settling, and separating the precipitate. Polyaluminum chloride (PAC) is dissolved in water to generate high polymers such as [Al (OH) (H2O) 5] < 2 + >, [Al8 (OH) 20 (H2O) x] < 4 + > and the like, the high polymers and F <-> form a complex through a hydroxyl bridging effect, and Al-F precipitate (such as AlF3. 3H2O) is further generated. The low-concentration fluorine-containing organic wastewater is efficiently purified through the oxidation-magnetic coagulation synergistic effect.

The invention provides a method for treating comprehensive wastewater by combining potassium ferrate with oxidation, and belongs to the field of industrial wastewater treatment. The method comprises three stages of wastewater pretreatment and treatment system starting, catalytic oxidation, solid-liquid separation and material regeneration, a Fe3O4 (at) MIP-Azo (at) K2FeO4: Azo-SO3 nanosheet material is combined with potassium hydrogen peroxymonosulfate, a sequencing batch reactor is used for catalytic oxidation treatment of comprehensive wastewater, and the Fe3O4 (at) MIP-Azo (at) K2FeO4: Azo-SO3 nanosheet is recycled after being separated and regenerated. According to the invention, the balance of selective adsorption and broad-spectrum oxidation is realized, the Fe3O4 (at) MIP-Azo (at) K2FeO4: Azo-SO3 nanosheets are used for targeted enrichment of specific pollutants, potassium hydrogen peroxymonosulfate and K2FeO4 are used for full-spectrum oxidation, full-chain treatment of comprehensive wastewater is realized, and the method is especially suitable for deep purification of industrial wastewater with complex components and high toxicity.

The invention discloses a potassium ferrate bottom-oriented enrichment slow-release agent and a preparation method and application thereof, and belongs to the technical field of bottom-oriented enrichment slow-release agents, and the preparation method comprises the following steps: S1, adding polyethylene glycol into water glass, dissolving, adding lithium hydroxide, acidifying, aging, washing, drying, grinding and calcining to obtain a modified carrier; s2, adding a potassium hydroxide solid into the hypochlorous acid solution, adding ferric hydroxide, continuously adding the potassium hydroxide solid, stirring at constant temperature, reacting to obtain a black purple solution, cooling, filtering and drying to obtain a potassium ferrate crude product; s3, adding the potassium ferrate crude product in the S2 into a 3M potassium hydroxide solution for dissolving, adding the modified carrier in the S1, stirring under an ultrasonic condition, then adding a potassium hydroxide solid to be saturated, keeping the temperature, standing, carrying out suction filtration, cleaning a filter cake, and drying to obtain a composite material; s4, grinding and sieving the composite material obtained in S3, mixing with a bottom enrichment agent, and tabletting to obtain a potassium ferrate bottom enrichment slow-release agent; the pond substrate can be improved.

The invention provides a method for removing total DNA (Deoxyribose Nucleic Acid) in wastewater with halide ion tolerance, which is used for removing DNA in wastewater containing halide ions based on a potassium ferrate and calcium sulfite coupling system, and belongs to the technical field of sewage purification treatment. The method provided by the invention utilizes Fe (IV) / Fe (V) / Fe (VI) and flocculent precipitate which are not interfered by halide ions in the reaction of potassium ferrate and slightly soluble calcium sulfite to realize efficient removal of DNA in wastewater. According to the method, the oxidation stability under halide ion interference is remarkably improved, better environmental adaptability and more stable removal efficiency are shown, and a new technical scheme is provided for treatment of actual wastewater containing resistance genes.

The invention discloses a continuous preparation device and method of high-purity potassium ferrate. The device comprises a reaction kettle, a stirring device is arranged on the reaction kettle, the interior of the reaction kettle is divided into an upper reaction area and a lower discharging area by an inclined baffle, a drain valve is arranged at the bottom of the lower end of the baffle, and an observation window is arranged on the side wall of the reaction kettle. The liquid discharging condition of the liquid discharging valve is observed; a discharge hole is formed in the side wall of the reaction area close to the lower end of the baffle; the stirring device comprises a motor fixedly arranged at the top of the reaction kettle, an output shaft of the motor is fixedly connected with a stirring shaft, the stirring shaft vertically penetrates through the interior of the reaction kettle, an anchor type stirring paddle is arranged on the stirring shaft, and the anchor type stirring paddle is located in the reaction area. According to the method, the high-purity potassium ferrate is directly separated from the reaction liquid, re-crystallization and organic solvent washing are not needed, and the obtaining cost of the high-purity potassium ferrate is effectively reduced.

The invention discloses sludge-soil-based flow-state solidified soil and a preparation method thereof.The method comprises the steps that 1, potassium ferrate, sodium hydroxide, sodium tripolyphosphate and water are added into sludge soil and stirred and mixed, and sludge soil slurry is obtained; the mass of the potassium ferrate is 0.2%-0.7% of the mass of the mucky soil; 2, a curing agent and water are added into the mucky soil slurry, stirring and mixing are conducted, and flow-state solidified soil is obtained; the curing agent comprises sulphoaluminate cement, Portland cement, steel slag powder, fly ash, a plasticizer, sodium thiocyanate, calcium formate and sodium silicate. By adopting the preparation method disclosed by the invention, the shrinkage of the cured mucky soil can be reduced, the stable improvement of the curing strength of the early-stage, middle-stage, later-stage and long-term fluid-state cured soil is ensured, and the flowability of the fluid-state cured soil is improved.

The invention discloses a highly efficient composite steel dust and mud washing solution treatment agent, belonging to the technical field of wastewater treatment. The treatment agent raw materials provided by the present invention include: 30-60 parts of sodium hydroxide, 30-60 parts of sodium carbonate, 0.45-0.9 parts of potassium ferrate and 12-16 parts of chitosan-coated loaded calcium peroxide tourmaline. The chitosan-coated loaded calcium peroxide tourmaline is based on tourmaline powder, loaded with calcium peroxide, and coated with a gel solution formed by chitosan to obtain a chitosan film coating layer, which is added to the washing solution. Chitosan can ensure the dispersibility of the loaded calcium peroxide tourmaline while adsorbing heavy metal ions. Calcium peroxide reacts with water, promotes the oxidation of heavy metals on the one hand, forms hydroxide precipitation, and locally releases heat on the other hand to produce a self-polarization effect of tourmaline, further improving adsorption performance. The purification treatment of the washing solution is realized under the synergistic effect of the multiple components of the treatment agent, simplifying the process flow.

The present invention belongs to the field of water environment restoration materials, and discloses a method for preparing a slow-release / temperature-controlled ferrate-silicon dioxide core-shell material and its effect of removing antibiotics. The method mainly includes: using an in-situ growth coating synthesis method, based on a silica material with excellent biocompatibility, large specific surface area and pore volume and easy surface modification, combined with potassium ferrate with strong oxidizing properties, to prepare a slow-release ferrate-silicon dioxide core-shell material; further, by loading a phase change material on a slow-release ferrate iron-silicon dioxide core-shell material, a slow-release and temperature-controlled composite material is prepared, and efficient utilization and precise release of oxidative active substances are achieved. The present invention realizes the slow-release efficient utilization and temperature-controlled precise release of oxidative active substances, and improves the oxidation utilization efficiency and removal capacity of oxidants for target pollutants.

The invention discloses a preparation method and application of ferroboron co-modified magnetic biochar, and relates to the technical field of water body pollution remediation functional materials. The invention aims to solve the problem that the existing adsorption material has a poor adsorption effect on PNP pollutants. The method comprises the following steps: dissolving boric acid into deionized water to obtain a solution a; adding biomass into the solution a, and fully stirring to obtain a solution b; drying the solution b to obtain a mixture c; mixing potassium ferrate with the mixture c obtained in the step S3, grinding and sieving to obtain a mixture d; the mixture d is heated to 690-700 DEG C and calcined for 1.8-2 h; after calcining is finished, cooling, grinding, washing to be neutral, and finally drying and sieving to obtain the ferroboron co-modified magnetic biochar. The preparation method and application of the ferroboron co-modified magnetic biochar can be obtained.

The invention discloses a method for rapidly improving potassium ferrate water treatment effect under alkaline conditions, which comprises the following steps: adding alkaline printing and dyeing wastewater into a potassium ferrate solution, mixing and standing, inducing potassium ferrate to generate oxidation-reduction reaction by organic matters in the alkaline printing and dyeing wastewater, reducing hexavalent iron ions into tetravalent iron ions, and separating the tetravalent iron ions from the potassium ferrate solution. Forming a solution containing tetravalent iron ions; the prepared solution containing the tetravalent iron ions is put into the alkaline printing and dyeing wastewater to be treated, so that the tetravalent iron ions in the solution containing the tetravalent iron ions and organic pollutants in the alkaline printing and dyeing wastewater to be treated are subjected to full contact reaction, and the alkaline printing and dyeing wastewater is degraded. According to the method, the water treatment effect of the potassium ferrate on the wastewater is remarkably improved, the TOC removal rate is improved by 10%-20% compared with that of a method for directly treating the wastewater through a potassium ferrate solution, the decolorization rate of the wastewater is also remarkably improved and can reach 70% or above, the pollution degree of the alkaline printing and dyeing wastewater is effectively reduced, and the method better meets the environment-friendly emission requirement.

The present invention discloses a method for purifying high-purity potassium ferrate, comprising the following steps: S1, adding a dilute KOH solution with a concentration of 2 to 6 mol / L to a crude potassium ferrate product to fully dissolve the crude potassium ferrate product, and collecting the filtrate for later use; S2, recrystallization: placing the filtrate in a constant temperature water bath, slowly adding a concentrated KOH solution with a concentration of 15 to 20 mol / L during stirring until potassium ferrate solid precipitates from the solution, standing for 15 to 90 minutes, and removing the filtrate to obtain potassium ferrate crystals; S3, washing: washing the potassium ferrate crystals multiple times; S4, drying: placing the washed potassium ferrate on a watch glass and drying it in a vacuum drying oven to obtain high-purity potassium ferrate. The present invention optimizes the purification process and refines the test parameters of the dissolution process, recrystallization process, rinsing process, and drying process to achieve a one-time purification of more than 90%, thereby improving the purification efficiency and reducing the purification cost.

The utility model relates to the technical field of wastewater treatment, in particular to a sequencing batch reaction device for removing total DNA (Deoxyribose Nucleic Acid) in sewage based on a ferrate and calcium sulfite coupling system. The reaction device comprises an active species generation zone, a reaction zone and a precipitation zone. The active species generation area is provided with a potassium ferrate and calcium sulfite liquid inlet, a reaction liquid outlet and a controllable stirring paddle, and a hose communicated with the reaction area is arranged at the bottom of the active species generation area; the reaction area is provided with an acid-base liquid inlet, a pH probe, a submersible stirrer, a reaction liquid inlet, a sewage sample inlet and a liquid medicine outlet, and a hose communicated with the settling area is arranged at the bottom of the reaction area; and the settling zone is of a funnel-shaped structure. According to the sewage treatment device, potassium ferrate and calcium sulfite are ensured to be fully mixed in the active species reaction zone through effective partitioning, so that the utilization efficiency of a medicament is improved, the medicament and sewage are fully mixed in the reaction zone, pollutants are removed, flocculates are removed through gravity settling in the settling zone, and the total DNA in the sewage is effectively removed.

The invention discloses a K4FeO4 solid and a preparation method and application thereof at room temperature. A method for preparing a K4FeO4 solid at room temperature comprises the following steps: S1: adding potassium hydroxide solid to a potassium ferrate K2FeO4 aqueous solution, so that the free alkali content in the solution is greater than 120mmol / L, and obtaining an alkaline potassium ferrate solution; S2: adding a trivalent iron salt solid to the alkaline potassium ferrate solution obtained in step S1, controlling the temperature at 15°C-25°C, reacting for 150min-240min and filtering, and the filtrate is a K4FeO4 solution; S3: vacuum concentrating the K4FeO4 solution obtained in step S2, cooling the concentrated solution to room temperature, and precipitating crystals; washing the obtained crystals with an organic solvent, and recrystallizing with water to obtain pure K4FeO4 crystals. The method for preparing a K4FeO4 solid at room temperature disclosed by the invention has the advantages of high yield, green environmental protection and low cost.

The invention belongs to the technical field of water treatment and disinfection, and particularly relates to a chlorine dioxide releasing agent with low corrosivity and a flocculation function and a preparation method of the chlorine dioxide releasing agent. The chlorine dioxide releasing agent is prepared from the following raw materials in percentage by mass: 8 to 12 percent of potassium ferrate, 16 to 22 percent of sodium chlorite, 15 to 23 percent of organic acid, 12 to 14 percent of ferric salt, 10 to 20 percent of peroxide donor, 6 to 12 percent of succinic acid and the balance of drying agent. The pH value of a solution activated by the chlorine dioxide releasing agent is close to neutral, and the problems that an existing chlorine dioxide releasing tablet is too low in pH and too strong in corrosion are solved; and moreover, the conversion rate of sodium chlorite and the purity of chlorine dioxide are effectively improved. In addition, the releasing agent also has dual effects of disinfection and flocculation of clear water, not only improves the disinfection efficiency, but also greatly reduces the production cost.

The invention provides a method for treating oily sewage through combination of potassium ferrate and sodium hypochlorite, and belongs to the field of oily sewage treatment. The method comprises the steps of pretreatment of oily sewage and wastewater, catalytic oxidation, solid-liquid separation and material regeneration. According to the method for treating the oily sewage through combination of the potassium ferrate and the sodium hypochlorite, the problems that in traditional oily sewage treatment, the utilization rate of an oxidizing agent is low, the sludge amount is large and energy consumption is high are solved, selective adsorption-catalytic oxidation integrated treatment of the oily sewage is achieved, a potassium ferrate decomposition product is Fe (OH) 3 floc, and the potassium ferrate and the sodium hypochlorite are recycled. The catalyst can adsorb residual pollutants and promote solid-liquid separation, no heavy metal sludge is generated, NaClO and K2FeO4 are catalytically activated, the actual dosage of the agent is reduced, and the sludge yield is low. The Fe3O4 (at) MIP-Azo (at) K2FeO4: Azo-SO2Cl nanosheet adopted by the invention realizes integration of multiple functions of adsorption, catalysis, oxidation and magnetic separation, target pollutants in oily sewage can be selectively captured, the local pollutant concentration is improved, and the subsequent oxidative degradation efficiency is accelerated.

The invention discloses a method for removing COD (Chemical Oxygen Demand) in wastewater and application of the method. The method comprises the steps that a composite oxidizing agent A is added into the wastewater, a first stirring reaction is carried out, and effective components of the composite oxidizing agent A comprise sodium percarbonate and manganese dioxide; a composite oxidizing agent B is added into the reacted wastewater, a second stirring reaction is carried out, and effective components of the composite oxidizing agent B comprise potassium ferrate and hydrogen peroxide. The method realizes efficient treatment of high-concentration organic wastewater, and has both economical efficiency and operability.

The invention discloses an oilfield produced water treatment process which comprises the following steps: alternately adding an iron ion transforming agent component A and a powerful component B into oilfield sewage subjected to oil removal and desulfurization treatment; then, adding a universal component C; wherein the iron ion transforming agent component A is one or any combination of potassium permanganate, hydrogen peroxide, bleaching powder, ClO2, chlorine, potassium ferrate, sodium hypochlorite and MnO2; the powerful component B is one or any combination of amino carboxylic acid salts and amino / hydroxyl phosphonic acid salts; and the general component C is one or any combination of hydroxycarboxylic acid or poly (phenol, enol) hydroxyl salts. The invention further discloses the combined reagent for treating the oilfield produced water and application of the combined reagent. The method provided by the invention has an obvious iron ion removal effect.

The invention relates to the technical field of potassium ferrate composite material preparation, and particularly discloses a solution filtration treatment device for potassium ferrate composite material preparation, the top of a filter cartridge is fixedly connected with a feed inlet, and the bottom of the filter cartridge is fixedly connected with a fine filtration part; limiting parts are slidably connected to the two sides of the inner wall of the filter cartridge, and a collecting part is fixedly connected to the side, close to the limiting parts, of the side face of the filter cartridge. According to the solution filtering treatment equipment prepared from the potassium ferrate composite material, the anti-blocking component is arranged, the filtering speed can be reduced when impurities block the meshes, and due to the design, blockages can be removed in time, the filtering capacity of the mesh plate can be kept, so that the overall filtering efficiency is guaranteed, and the situation that the filtering process is stopped or greatly slowed down due to mesh blockage is avoided; and the production efficiency is improved, manual frequent cleaning of meshes or replacement of the screen plate is not needed, and the maintenance workload is reduced.

The application discloses a method for removing trace thallium in wastewater by using a high ferrate system reinforced by iron-modified graphene nanobiocarbon, and belongs to the technical field of wastewater treatment. The method comprises the following steps: modifying biocarbon with iron to obtain iron-modified nanobiocarbon, loading graphene on the iron-modified nanobiocarbon, confining and doping iron particles in graphene nanometer, and obtaining iron-modified graphene nanobiocarbon. The application firstly confines and dopes iron particles in graphene nanometer, constructs a multifunctional material with high adsorption capacity and multiple active sites, and couples a potassium ferrate process to construct an adsorption-oxidation synergistic thallium removal system.

The invention relates to a potassium ferrate pre-oxidation-based silver and gold ore cyaniding silver and gold extraction method, and belongs to the technical field of hydrometallurgy. According to the method, potassium ferrate is used as a main oxidizing agent, sulfuric acid is used as an auxiliary agent, the silver-gold ore is pretreated, sulfide minerals wrapping gold and silver are effectively broken through the strong oxidation effect of the potassium ferrate and the synergistic effect of the sulfuric acid, and therefore wrapping is opened, the gold and the silver are exposed, and then cyanidation leaching is conducted. The method has the advantages of efficient leaching, environmental protection and energy saving, under the condition that the same leaching effect is achieved, the use amount of a cyaniding agent can be reduced, the production cost can be reduced, meanwhile, potential hazards of cyanide to the environment are reduced, an efficient, environment-friendly and energy-saving solution is provided for the cyaniding silver and gold extraction technology of the silver and gold containing ore, and the method has the advantages of being high in practicability and wide in application prospect. The method has a wide application prospect and important practical significance.

This invention belongs to the field of water treatment and disinfection technology, specifically relating to a chlorine dioxide releasing agent with both low corrosivity and flocculation functions, and its preparation method. The chlorine dioxide releasing agent is composed of the following raw materials in the indicated mass percentages: potassium ferrate 8-12%, sodium chlorite 16-22%, organic acid 15-23%, iron salt 12-14%, peroxide donor 10-20%, succinic acid 6-12%, with the balance being a desiccant. The activated solution of the chlorine dioxide releasing agent obtained by this invention has a near-neutral pH value, solving the problem of excessively low pH and strong corrosion in existing chlorine dioxide releasing tablets; it also effectively improves the conversion rate of sodium chlorite and the purity of chlorine dioxide. Furthermore, this releasing agent has dual functions of disinfection and flocculation of clean water, not only improving disinfection efficiency but also significantly reducing production costs.

The invention provides a culture method and device of anaerobic ammonia oxidation sludge particles and application, and belongs to the technical field of anaerobic ammonia oxidation. Iron-rich activated carbon is used as a carrier, sludge is inoculated, and a nutrient solution is added for sludge granulation culture; the preparation method of the iron-rich activated carbon comprises the following steps: impregnating biochar with a potassium ferrate solution, and drying to obtain potassium ferrate modified biochar; calcining the potassium ferrate modified charcoal in an anaerobic environment to obtain iron-rich activated carbon; the sludge contains microbial flora of Bacteroidota, Planctomycin and Chloroflexi, and the microbial flora of Bacteroidota, Planctomycin and Chloroflexi is used as a raw material. According to the present invention, iron-rich active carbon is adopted as a carrier, AL-2 and c-di-GMP bi-component quorum sensing signal molecules secreted by flora and other EPS with high protein content ratio are adopted, and Chloroflexi filamentous structure and gliding movement ability are adopted to promote the copolymerization of the three bacteria, such that the granulation of the anaerobic ammonium oxidation bacteria important family member Planctomycin is promoted.

The present application relates to a kind of oil-removing denitrification phosphorus-removing agent for treating domestic sewage and its preparation, method for using, phosphorus-removing agent is prepared from the following weight parts of raw materials: 15-29 parts of dodecyl imidazoline, 18-35 parts of sodium alginate, 10-30 parts of coconut shell powder, 20-40 parts of potassium ferrate, 15-45 parts of microcrystalline cellulose.The composite phosphorus-removing agent can not only remove oil, denitrification and phosphorus, but also the consumption of reagent is only 1 / 4 of conventional phosphorus-removing agent, when using, a certain amount of iron-containing aluminate waste water is introduced into domestic sewage and mixed according to proportion, and the sedimentation tank process is changed into flotation process, then the composite phosphorus-removing agent is added, and the suspended substance in water is used to collect iron-aluminum phosphorus compound, after such modification, various harmful substances in water quality are removed, and the consumption of phosphorus-removing agent is also greatly reduced.

The invention is applicable to the technical field of water treatment and drinking water disinfection, and provides a dynamic pre-oxidation disinfection method for inhibiting generation of halogenated disinfection byproducts, which comprises the following steps: raw water pretreatment: treating raw water to reduce turbidity and organic matters; pre-oxidation treatment: adding a pre-oxidant potassium ferrate into the pretreated raw water to carry out a pre-oxidation reaction, and removing generated iron flocs after the pre-oxidation reaction; chlorine disinfection treatment: adding a sodium hypochlorite solution into the pre-oxidized water for chlorine disinfection. According to the method, potassium ferrate pre-oxidation and a disinfectant (sodium hypochlorite) are combined for use, an online monitoring and feedback regulation system is combined, a disinfection process is dynamically optimized to reduce generation of halogenated disinfection byproducts (DBPs) in drinking water, and the method is suitable for advanced purification and safety guarantee of drinking water treatment in urban and rural water plants, emergency water purification devices and micro-polluted water sources.

The invention relates to the technical field of surface functional coatings, in particular to plasma electrolytic oxidation liquid and a preparation method thereof, and a titanium alloy fastener surface oxide ceramic coating and a preparation method thereof. The invention provides plasma electrolytic oxidation liquid. The plasma electrolytic oxidation liquid comprises a film-forming agent, a coloring agent, a bath solution stabilizer, a coloring auxiliary agent and water, the film-forming agent comprises one or more of sodium pyrophosphate, sodium polyphosphate and sodium perphosphate; the coloring agent comprises one or more of dicobalt oxalate tetraacetate, copper tetramine sulfate, titanium potassium oxalate and potassium ferrate; the bath solution stabilizer comprises one or more of disodium ethylenediaminetetraacetate, sodium tetraborate, sodium potassium tartrate tetrahydrate and sodium citrate; the coloring auxiliary agent comprises one or more of sodium silicate, sodium tungstate and sodium molybdate. The plasma electrolytic oxidation liquid can ensure that a surface coating with good blackness is obtained on the surface of a titanium alloy fastener within a short time.