96 results about "Advanced oxidation process" patented technology

The invention discloses a multilayer graphene-loaded cobalt-nitrogen-carbon monatomic catalyst for an advanced oxidation process, and a preparation method and application thereof, and belongs to the technical field of catalysis. The catalyst is prepared by the following method: dispersing reduced graphene oxide in a solvent, performing ultrasonic treatment, then adding cobalt salt, and performing ultrasonic treatment; then carrying out hydrothermal reaction on the mixed solution, and after the reaction is finished, washing and drying a product to obtain the multi-layer graphene loaded cobalt nitrogen carbon monatomic catalyst. The prepared catalyst overcomes the defects of a traditional symmetric coordination catalyst in the aspects of activity, selectivity, stability and the like, the application range of a monatomic catalyst is further widened, and the catalyst has very excellent activation performance on persulfate; the catalyst can be applied to advanced treatment of sewage containing organic pollutants together with persulfate, and the biodegradability of the sewage is improved, so that the catalyst shows a relatively good application prospect in the technical field of catalysis.

The invention relates to the technical field of lithium ion battery recovery and wastewater treatment, and discloses a method for recovering valuable metals in waste lithium batteries and synchronously degrading antibiotics in water. The method comprises the following steps: adding a waste lithium battery positive electrode material and an oxidizing agent into antibiotic wastewater, and reacting to obtain a positive electrode metal leaching solution; adjusting the pH value of the anode metal leachate to 9-14, and carrying out solid-liquid separation to obtain a lithium-rich filtrate and a transition metal precipitate; and adding a precipitator into the lithium-rich filtrate, carrying out precipitation reaction, and collecting a lithium-rich precipitate. According to the method provided by the invention, based on an advanced oxidation process, the transition metal in the positive electrode material of the waste lithium battery can be oxidized and dissolved by an oxidizing agent to recover metal resources, and can also be used as a catalyst to activate the oxidizing agent to generate free radicals and degrade antibiotics, so that metal recovery and pollutant degradation are synchronously completed in a single system; the method is easy to operate, co-treatment of urban solid waste and wastewater is promoted, and good ecological environmental benefits are achieved.

The invention relates to the technical field of environmental protection, in particular to a wastewater treatment process for butadiene extraction. According to the wastewater treatment process disclosed by the invention, the biodegradability of the wastewater is improved by adopting ultrasonic-microelectrolysis combined pretreatment, and various pollutants in the wastewater are efficiently removed through a series of innovative means such as synergistic biological treatment, a novel sulfide treatment method, an optimized advanced oxidation process and integration of membrane separation and concentration technologies. The treated wastewater is discharged after reaching the standard, the water resource recovery rate is remarkably improved, meanwhile, the treatment cost is reduced, and good economic and environmental benefits are achieved.

The invention relates to the technical field of industrial wastewater treatment, and discloses a treatment method for grinding fluid wastewater of a grinder, which comprises the following steps: pretreatment and demulsification, multi-stage chemical purification, biochemical deep treatment, deep purification and recycling, and sludge treatment. A specific supported heterogeneous catalyst is adopted in the multi-stage chemical purification step, nano zero-valent iron and copper oxide composite active components constructed on the surface of the catalyst can enhance the generation efficiency and stability of free radicals in the advanced oxidation process, and a composite coagulant with an optimized ratio in the coagulating sedimentation step is cooperated, so that the purification efficiency of the high-grade oxidation process is improved. An efficient continuous removal system for heavy metal ions and refractory organic pollutants is formed; meanwhile, in the pretreatment step, the demulsifier is composed of specific components, through the synergistic effect of all the components, rapid demulsification of the emulsified oil phase in the grinding fluid wastewater is achieved, favorable conditions are created for subsequent deep treatment, and therefore the purification efficiency and operation stability of the technology are overall improved.

A wastewater treatment device based on a persulfate advanced oxidation process comprises a persulfate advanced oxidation reactor, a persulfate adding device and a catalyst adding device, and is characterized in that the persulfate advanced oxidation reactor adopts a structural design of a cylinder at the upper part and a cone at the lower part; an anchor-paddle composite water impeller, a filler layer, a persulfate distributor and a catalyst distributor are arranged in the reactor, an overflow weir, an ultrasonic device, a chemical oxygen demand (COD) on-line analyzer and an oxidation-reduction potential (ORP) on-line analyzer are arranged on the outer wall of the reactor, an anchor stirrer is matched with the conical bottom of the reactor, and through the synergistic effect of mechanical stirring and the ultrasonic device, the persulphate on-line analyzer and the persulphate on-line analyzer are analyzed. A strong shear flow field and an ultrasonic cavitation field are constructed, efficient activation of persulfate and a catalyst is achieved, and the effluent quality is improved. The method has the advantages of high solid-liquid mass transfer efficiency, high catalyst utilization rate, low operation energy consumption, remarkable sludge reduction effect and the like, and is particularly suitable for treating refractory organic wastewater generated in the industries of pharmacy, pesticide and the like.

The invention relates to an oil-water separation membrane as well as a preparation method and application thereof, and belongs to the field of gas field brine pretreatment. The oil-water separation membrane comprises a nanofiber membrane substrate and an MOFs layer loaded on at least part of the surface of the nanofiber membrane substrate, and the MOFs layer comprises two-dimensional MOFs nanosheets; the nanofiber membrane substrate is prepared by performing electrospinning on three-dimensional MOFs and an organic polymer; the two-dimensional MOFs nanosheet is obtained by secondary growth on the surface of the nanofiber membrane substrate through hydrothermal recrystallization. The oil-water separation membrane can be used for efficiently separating petroleum pollutants and solid suspended matters in the oil and gas field produced wastewater, and can be coupled with an advanced oxidation process based on sulfate free radicals to realize synchronous and efficient removal of oil, suspended particles and organic matters in the oil and gas field produced wastewater.

The invention discloses a composite cathode material integrating electrocatalysis and ozone oxidation functions, a preparation method and application. The composite cathode material is composed of oxidized carbon nanotubes, cuprous oxide and copper oxide. The copper loading capacity of the composite cathode material is 1-10wt.%; the diameter of the oxidized carbon nanotube is 5 to 10 nm; the mass ratio of the oxidized carbon nanotubes to the cuprous oxide to the copper oxide is (298-27): (3.0-2.5): (0-1). A composite cathode material integrating electrocatalysis and ozone oxidation functions is elaborately designed and prepared and is applied to an electrocatalytic ozone coupling system, and continuous and efficient attack on antibiotic molecules and degradation intermediates thereof is realized by utilizing multiple synergistic effects among all components of the material and in the electrocatalytic ozone process, so that the electrochemical performance of the composite cathode material is improved. Therefore, the technical bottleneck of low TOC removal rate in the traditional advanced oxidation process is broken through, and a new technical approach is provided for thoroughly eliminating the antibiotic risk in the water environment.

The invention discloses an iron-mud-based environmental functional material based on an electrochemical-ferrate synergistic effect as well as a preparation method and application of the iron-mud-based environmental functional material. The material is derived from an iron sludge byproduct generated in the process of cooperatively treating wastewater by electrochemical oxidation and ferrate. Due to the influence of active oxygen species, electric field action and local pH gradient in an electrochemical system, the forming process of the iron mud is different from that of conventional chemical precipitation, the obtained material has an amorphous and high-specific-surface-area unique structure and is endowed with remarkable oxidation capacity, and cooperation of oxidation and adsorption functions is achieved. The material disclosed by the invention can be used for efficiently removing anion pollutants such as arsenic, antimony and phosphate in a water body. According to the invention, solid wastes generated by a combined process are converted into a high-performance adsorption material, so that the resource utilization of treating wastes with wastes is realized, the comprehensive operation cost of the advanced oxidation process is effectively reduced, and the method has good environmental and economic benefits and application prospects.

This invention relates to the field of industrial wastewater treatment technology, specifically a highly efficient treatment method for methionine wastewater, comprising the following steps: Step 1: pH adjustment, adjusting the pH of the methionine wastewater to 6.0-7.0; Step 2: Polyferric sulfate coagulation and sedimentation, adding polyferric sulfate and polyacrylamide to the pH-adjusted wastewater; Step 3: Pre-stage ozone oxidation, passing the supernatant obtained in Step 2 through ozone-containing gas for oxidation treatment; Step 4: Biochemical treatment, subjecting the effluent from Step 3 to a biochemical reaction, sequentially passing through anoxic and aerobic stages; Step 5: Post-stage ozone oxidation, passing the biochemical effluent obtained in Step 4 again through ozone-containing gas for deep oxidation treatment; Step 6: Activated carbon adsorption. The methionine wastewater treated by this invention can significantly reduce TOC concentration and improve COD removal rate. The pH pre-adjustment step effectively reduces the quenching effect of alkalinity on hydroxyl radicals, ensuring the efficiency of subsequent advanced oxidation processes.

The invention discloses a sewage plant tail water treatment system and method, and relates to the technical field of sewage treatment.The sewage plant tail water treatment system is applied to tail water generated by a sewage plant adopting an ozone advanced oxidation technology, and the treatment system comprises an activated carbon reaction device, a denitrification reaction device, an ecological pond and a horizontal subsurface flow wetland; the activated carbon reaction device is communicated with the tail water pipe and comprises an activated carbon filtering layer, and the activated carbon filtering layer is used for adsorbing chemical oxygen demand and dissolved oxygen in tail water; the denitrification reaction device is communicated with the activated carbon reaction device and comprises a denitrification filter material layer, and the denitrification filter material layer is used for autotrophic denitrification nitrogen removal of tail water; the ecological pond is communicated with the denitrification reaction device and comprises aquatic plants and aquatic animals; the horizontal subsurface flow wetland is communicated with the ecological pond and is used for deeply filtering the tail water. The treatment system can improve the purification effect of the tail water of the sewage plant.

The application relates to the technical field of wastewater treatment, in particular to a device for comprehensively treating wastewater based on a high-level oxidation method, which comprises a base, a frame body slidingly arranged on the base, a treatment barrel rotatingly and sealingly arranged in the frame body through a first mounting ring, an electric cylinder arranged on the base and fixedly connected with the frame body at an output end, an air bag transversely arranged between the frame body and the base, a water inlet valve pipe arranged at one end of the treatment barrel, and a water outlet valve pipe rotatingly and sealingly arranged at the other end of the treatment barrel through a second mounting ring; the device is characterized in that the electric cylinder reciprocatingly slides, a rack drives a transmission assembly, then the treatment barrel is driven to rotate in the frame body through thread engagement, full stirring of the wastewater is realized through movement in two directions of the transverse direction and the axial direction, the air bag is driven to stretch and contract through relative movement of the frame body and the base, the wastewater is aerated, and the quality of the wastewater treatment is improved through multiple filtration of the filler ring plate.

The invention relates to the technical field of liquor industrial wastewater treatment, in particular to an advanced treatment system and method for liquor industrial wastewater. Comprising a water inlet pump, a quartz sand filter in pipeline connection with the water inlet pump, a self-cleaning filter in pipeline connection with the quartz sand filter, an ultrafiltration device in pipeline connection with the self-cleaning filter, an ultrafiltration water producing tank in pipeline connection with the ultrafiltration device, and a nanofiltration water feeding pump in pipeline connection with the ultrafiltration water producing tank, according to the present invention, the problem that the organic matter cannot be deeply and substantially removed after the biochemical treatment can be solved, and the separation treatment cost is low, and the high-cost treatment modes such as the advanced oxidation process such as Fenton do not need to be adopted so as to substantially reduce the production operation cost. According to the invention, blockages are backwashed to the micro-electrolysis device at the same time, so that the problem of blockage can be solved, and the centralized treatment efficiency of high-concentration pollutants causing blockage is also greatly improved.

The present application belongs to the technical field of wastewater treatment, and particularly relates to a method for treating organic phosphonic acid wastewater by using a supported copper monatomic catalyst, wherein persulfate and the supported copper monatomic catalyst are added into the organic phosphonic acid wastewater to degrade the organic phosphonic acid; the supported copper monatomic catalyst is a metal oxide loaded with copper monatomic atoms, wherein the loading amount of the copper monatomic atoms is 1-10 wt% of the total weight of the catalyst. Compared with the prior art, the present application solves the problem that metal ions cannot be recovered in the advanced oxidation process of the prior art in the treatment of organic phosphonic acid wastewater. The present application provides an advanced oxidation technology for organic phosphonic acid wastewater, realizes efficient and deep degradation of the organic phosphonic acid in the wastewater, can adapt to wastewater in a wide pH range, and has strong anti-interference and high selectivity after multiple degradation, with a very low metal leaching content (0.0015 mg / L).

The present invention provides a g-C3N4-based nanocomposite material for removing tetracycline, and its preparation method and application. The composite material is prepared by the following method: a sulfur source, a copper source and g-C3N4 are reacted in a solvent at 60-70°C for 1-6h, and then a g-C3N4-based precursor is separated; after drying, the precursor is calcined at a constant temperature of 350-500°C under an air atmosphere to obtain the product. The material of the present invention can utilize green molecular oxygen as an oxidant, and has excellent catalytic performance and adsorption efficiency, high selectivity and stability through the combination of advanced oxidation process and adsorption. Using the composite material, wastewater can be directly used to remove tetracycline without dilution treatment. The present invention is simple to prepare, convenient and fast, and is synthesized using relatively cheap and easily available raw materials. The cost is low, the reproducibility of the sample is relatively good, and it is suitable for large-scale production. It has certain development potential and application prospects in the field of water environment treatment.

Water treatment systems are disclosed. The system includes an electrochemical cell having an inlet and an outlet, a cathode comprising a catalytic material for electrochemical generation of persulfate free radicals, and an anode, a source of a persulfate positioned upstream of the electrochemical cell, first contaminant concentration sensor positioned upstream of the electrochemical cell, and a controller operatively coupled to receive one or more input signals from at least the first contaminant concentration sensor. Methods of treating water using the electrochemical cell disclosed herein are disclosed. Methods of facilitating water treatment by providing the electrochemical cell disclosed herein are disclosed. Methods of retrofitting a water treatment system having an AOP by providing the electrochemical cell disclosed herein are disclosed.

A depuration process is employed for removing off-flavor contaminants from fish through an advanced oxidation process. Before the fish is harvested, the fish is transferred to a depuration tank or zone containing water. Off-flavor compounds leach from the tissue of the fish into the water in the depuration tank or zone. The water in the depuration tank or zone is circulated through an advanced oxidation reactor that, through an oxidation process, reduces the concentration of the off-flavor contaminants in the water.

The invention relates to an arrangement for cleaning swimming pool water, comprising a fluid conduit which has an inlet and an outlet and along which at least the following components that are fluidically connected to the fluid conduit are arranged in the following sequence between the inlet and the outlet of the fluid conduit: an addition unit for H2O2, a catalyst unit for initiating a Fenton reaction, a unit for generating an advanced oxidation process (AOP), a reaction chamber with a mixer, and a filter unit for filtering organic chlorine compounds, the components being suitably designed such that they are arranged on a mobile means of transport, for example in the form of a sack truck, for portable handling of the whole arrangement.

A process for the treatment of water, in particular for the treatment of waste water, in a treatment system having an inlet and an outlet, comprising the introduction of ozone into the water to be treated and the UV irradiation of the ozonated water within a reaction chamber, wherein hydrogen peroxide is produced by the UV irradiation of the ozonated water in the reaction chamber and wherein the amount of ozone used for the water treatment and / or at least one irradiation-related parameter of the UV irradiation are adjusted such that the treated water after the UV irradiation at the outlet of the treatment system contains i) hydrogen peroxide dissolved in the water in a mass ratio of hydrogen peroxide to introduced ozone in a range from 0.01 to 1.0, preferably in a range from 0.01 to 0.5, and ii) ozone dissolved in the water in a maximum amount of ≤ 0.1 mg / l.

The application discloses an ozone micro-nano bubble coupling ultraviolet oxidation wastewater treatment process, which comprises the following steps: filtered wastewater is pumped by a booster pump, and then sequentially passes through a micro-nano bubble jet device connected with an ozone generator and a flow-through ultraviolet lamp, and finally enters an oxidation contact tank; the wastewater in the oxidation contact tank is continuously circulated by the wastewater booster pump, and treated wastewater is discharged after COD reaches a standard. The ozone micro-nano bubble coupling ultraviolet oxidation wastewater treatment process has the advantages that the process is used for treating chemical industrial park wastewater by adopting the ozone micro-nano bubble technology coupling ultraviolet jet advanced oxidation process, ozone utilization rate is high, process conditions are mild, and the removal effect of wastewater COD is good, so the process has great potential in the field of wastewater treatment; the ozone micro-nano bubble coupling ultraviolet advanced oxidation process requires less hardware equipment and has low operation cost, so the process has a broad application prospect in the field of engineering wastewater treatment.

The present utility model relates to a sustainable, solar-powered facility for the treatment of medical waste and its conversion into pavement bricks. The facility comprises a medical waste input module, a size-reduction assembly including a double-shaft crusher and granulator, an underground transfer tank, sanitation tanks equipped with an Advanced Oxidation Process (AOP) system, a trommel-based separation system, a cement mixer, a screw conveyor, a hydraulic pavement brick making machine, and an underground water storage tank. In operation, medical waste undergoes size reduction and is transferred to the sanitation tanks, wherein the AOP system generates hydroxyl radicals to disinfect and oxidize contaminants. The treated waste is then separated into liquid and solid fractions, with the liquid component directed to the water storage tank for treatment and recycling, and the solid component blended with cementitious materials and formed into pavement bricks using the hydraulic machine. The facility is powered by a hybrid solar energy system configured to support continuous operation, including in off-grid or limitedaccess areas. The utility model provides an integrated solution for safe medical waste treatment and resource recovery.

The invention discloses a polyester printing and dyeing alkali-minimization wastewater pretreatment process which comprises the following steps: (1) roughly filtering alkali-minimization wastewater by adopting a fine grid to remove insoluble impurities; (2) conveying the roughly filtered wastewater to an adjusting tank, and collecting, averaging and homogenizing the wastewater; (3) conveying the alkali-minimization wastewater in the step (2) to a coagulative precipitation tank, adjusting the pH value of the wastewater to be neutral, and reacting the wastewater with the added coagulant aid and flocculant to remove SS (suspended solids) in the wastewater; (4) conveying the supernate obtained in the step (3) to an acid precipitation tank, continuously adjusting the pH value, carrying out an acid precipitation reaction, and realizing solid-liquid separation under the action of gravity; and (5) conveying the supernatant wastewater obtained in the step (4) to an iron-carbon micro-electrolysis tank and a Fenton oxidation tank, removing most pollutants in the wastewater by using an advanced oxidation process, and mixing the wastewater with other wastewater for subsequent treatment. The two-stage advanced oxidation process is adopted, the COD removal rate can reach 85% or above, the follow-up biochemical treatment load is effectively reduced, and the biodegradability of the wastewater is improved.

This invention discloses a composite catalyst, its preparation method, and its application in sludge treatment, belonging to the field of sludge treatment and environmental protection technology. The invention synthesizes an iron-carbon nanocomposite catalyst using ferric nitrate nonahydrate, antibiotic bacterial residue, and melamine as precursors. The resulting catalyst can, on the one hand, activate ammonium persulfate to generate free radicals that disrupt the water-locking structure of the sludge, enhancing its hydrophobicity and thus improving dewatering efficiency. On the other hand, the Fe species in the composite catalyst activates ammonium persulfate to form Fe... 3+ Fe 3+ The hydrolysis generates ferric hydroxide colloids that can adsorb sludge particles, neutralize surface charges, thereby reducing interparticle repulsion, promoting floc aggregation, and enhancing dewatering efficiency. The advanced oxidation process of ammonium persulfate catalyzed by iron-carbon nanocomposite catalysts also achieves the removal of antibiotic resistance genes from sludge.

INDUSTRIAL PROCESS FOR THE TOTAL DESTRUCTION OF POLLUTANTS IN GAS OR LIQUID COMPOUNDS BY CHEMICAL MODIFICATION. The invention relates to a process for the chemical modification of pollutants in a gaseous or liquid composition followed by their total destruction by an advanced oxidation process (AOP), for the treatment of any pollutant, alone or in a multi-pollutant mixture, selected from: - Alkali-sensitive inorganic compounds or those simply soluble in aqueous media. - Alkali-sensitive organic compounds or those simply soluble in aqueous media. A process for the chemical modification and total destruction of alkali-reactive pollutants, partially or totally water-soluble, present in a gaseous or liquid effluent has now been developed.

The invention discloses an environment-friendly artificial tree system for improving air pollution, which takes a boron-doped diamond (BDD) electrode, a titanium dioxide coated filter ball and an advanced oxidation process (AOP) as cores, realizes air purification by using easily available water and has a multi-scene adaptation function, and comprises a cylindrical hollow shell part fixed on the ground; the purified water tank part is arranged at the lower end of the shell part and quantitatively introduces and filters purified water; a BDD atomizing unit that electrolyzes the purified water by means of a BDD electrode to generate a disinfectant and atomizes the disinfectant; the pipeline fan module part is positioned above the BDD atomizing part and is used for conveying the vaporific disinfectant and introducing filtered external air; and the advanced oxidation reaction part is connected to the upper side of the pipeline fan module part and is used for sterilizing by using ultraviolet rays and decomposing macromolecular organic compounds through AOP. The system can remove fine particulate matters, oxidize and decompose nitrogen oxides, sulfur oxides and the like, kill viruses and improve the air quality.

The invention belongs to the technical field of wastewater treatment, and particularly relates to a method for treating organic phosphonic acid wastewater by using a supported copper monatomic catalyst, which comprises the following steps: adding persulfate and the supported copper monatomic catalyst into the organic phosphonic acid wastewater to degrade organic phosphonic acid; the supported copper monatomic catalyst is a metal oxide loaded with copper monatomic atoms, and the loading amount of the copper monatomic atoms is 1-10 wt% of the total weight of the catalyst. Compared with the prior art, the problem that metal ions cannot be recycled in organic phosphonic acid wastewater treatment of an advanced oxidation process in the prior art is solved. The scheme provides an advanced oxidation technology for organic phosphonic acid wastewater, efficient and deep degradation of organic phosphonic acid in the wastewater is realized, the method can adapt to wastewater in a wider pH range, the metal leaching content is extremely low (0.0015 mg / L) after multiple degradation, and the method has strong anti-interference performance and high selectivity.

The application relates to a preparation method of an iron-molybdenum bimetallic MOF derived catalyst and application of the iron-molybdenum bimetallic MOF derived catalyst in treatment of refractory organic wastewater by activated persulfate. The application is based on a transition metal activated persulfate (PDS) advanced oxidation process, and a magnetic recyclable iron-molybdenum bimetallic composite catalyst (Fe / Mo@C) is successfully prepared by a co-precipitation and calcination method. The Fe / Mo@C is a porous nanomaterial, has rich surface active sites, a large specific surface area, a simple synthesis process, superior performance, a wide pH action range, and has a good application prospect. In the present study, bisphenol A (BPA) is selected as a target pollutant, and the composite catalyst shows high reaction activity in removal of BPA, and 20mg / L BPA can be rapidly removed within 10min. The excellent performance is due to the synergistic effect of the molybdenum-iron bimetallic material, which accelerates Fe(II) / Fe(III), Mo(IV) / Mo(VI) double circulation, accelerates generation of SO4 · And ·OH by activation of PDS to rapidly further attack and decompose organic pollutants. The application provides a new idea for preparation of a new efficient catalyst and treatment of refractory organic pollutants by activated persulfate.

The invention discloses iron-cobalt modified biochar as well as a preparation method and application thereof, and belongs to the technical field of organic pollutant treatment, the iron-cobalt modified biochar can remove norfloxacin through an adsorption effect, and can activate peroxymonosulfate to generate sulfate free radicals, so that the norfloxacin is degraded through an advanced oxidation process. Fe and Co on the surface of Co-Fe-BC are used as catalysts, the energy threshold of sulfate free radicals generated by persulfate decomposition can be reduced, and the activation rate of persulfate is increased. The generated sulfate free radicals have high oxidation-reduction potential, can attack norfloxacin molecules in a non-selective manner, and initiate free radical chain reaction through hydrogen atom picking or an electron transfer mechanism, and finally, norfloxacin is mineralized into harmless small molecular substances, such as carbon dioxide and water. The process not only effectively removes norfloxacin, but also reduces the generation of disinfection by-products, and improves the safety of water quality.

The application discloses a kind of high oxidation process catalysts for low-cost treatment of industrial organic wastewater and its preparation method and application, belong to environmental remediation material preparation and water pollution control field.The preparation of the catalyst is based on biochar, natural iron manganese mineral, first, after screening, natural magnetite and soft manganese ore are fully mixed in a certain proportion and are subjected to ball milling treatment, and the biochar doped with impurity elements is obtained by pyrolysis method, the impurity element doped biochar, iron manganese mineral composite catalyst is fully mixed, and then ball milling treatment is carried out under the protection of inert atmosphere, and the catalyst is obtained.The impurity element doped biochar contained in the catalyst promotes the aggregation of pollutants and electron transfer, and the iron manganese bimetallic elements can be used as active sites, and the synergistic effect between them significantly increases the activation efficiency and improves the degradation efficiency of pollutants.

The present application relates to the precise quantitative method of quenching agent in advanced oxidation treatment of sewage, comprising the following steps: S1: using the standard substance of the to-be-treated pollutant to prepare the to-be-tested pollutant mother liquor; S2: taking several portions of the to-be-tested pollutant mother liquor with the same volume, respectively adding different volumes of the quenching agent, and then forming several portions of the first to-be-tested liquid after constant volume; S3: taking the same volume of sample from the several portions of the first to-be-tested liquid for detection, and determining the maximum volume fraction of the quenching agent ensuring the detection accuracy; S4: taking several portions of the to-be-tested pollutant mother liquor with the same volume, respectively adding different volumes of the quenching agent, adding the catalyst and the oxidant, and then forming several portions of the second to-be-tested liquid after reaction; S5: controlling the sampling volume, determining the minimum volume fraction of the quenching agent required for terminating the oxidation reaction within the range of the maximum volume fraction of the quenching agent; and S6: actual sewage oxidation experiment, determining the addition amount of the quenching agent according to the maximum volume fraction of the quenching agent and the minimum volume fraction of the quenching agent.

The invention belongs to the technical field of wastewater treatment, and provides a hydroxyethyl and tungsten oxide co-modified graphite-phase C3N4 composite photocatalyst as well as a preparation method and application thereof. The composite photocatalyst is composed of graphite phase C3N4 and WO3 anchored to the graphite phase C3N4 through 2-hydroxyethyl, C atoms, not connected with hydroxyl, in the 2-hydroxyethyl are combined with N atoms of terminal amino or terminal imino of the graphite phase C3N4 to form C-N bonds, W atoms of WO3 are combined with O atoms of the 2-hydroxyethyl to form W-O bonds, and the W atoms of WO3 and O atoms of the 2-hydroxyethyl are combined to form C-N bonds. And the graphite phase C3N4 and WO3 are coupled through an interface W-O-C bond to form the S-schema heterojunction. According to the present invention, the OH generation efficiency of the existing graphite-phase C3N4-based catalyst can be improved, the photocatalytic advanced oxidation performance of the graphite-phase C3N4-based catalyst can be improved, and the organic pollutant degradation efficiency of the existing graphite-phase C3N4-based catalyst-driven advanced oxidation process can be improved.