123 results about "Advanced oxidation process" patented technology

According to the present invention, there is provided a monatomic catalyst, the monatomic catalyst comprising: a nitrogen-doped carbon structure; and a monatomic metal wherein the monatomic metal forms a coordinate bond with a nitrogen atom of the nitrogen-doped carbon structure. When an electrochemical cell having an electrode pair containing the monatomic catalyst is used in an electrochemical advanced oxidation process for water treatment, organic pollutants in wastewater can be effectively decomposed under mild pH conditions.

The invention discloses a Cu2WS4-CuBi2O4 composite material with a photothermal effect and a preparation method and application thereof.The Cu2WS4-CuBi2O4 composite material is supported by CuBi2O4 of a rod-shaped structure, flaky Cu2WS4 is loaded on the surface of the rod-shaped CuBi2O4 through the interface regulation and control effect of a surfactant by adopting a hydrothermal method, and a Z-type heterojunction with the photothermal effect is formed; in an antibiotic degradation system, the Cu2WS4-CuBi2O4 composite material shows good photocatalytic performance and degradation effect under the synergistic effect of a photothermal effect and a PDS advanced oxidation process. The device is simple to prepare, stable in structure, high in repeatability and free of secondary pollution, and can meet laboratory and industrial requirements.

The invention discloses a low-cost advanced oxidation process catalyst for treating industrial organic wastewater as well as a preparation method and application thereof, and belongs to the field of preparation of environmental remediation materials and water pollution control. The preparation method of the catalyst is based on biochar and natural iron and manganese minerals, and comprises the following steps: firstly, crushing and sieving natural magnetite and pyrolusite, fully mixing according to a certain proportion, carrying out ball milling treatment, and obtaining miscellaneous element doped biochar by utilizing a pyrolysis method; and fully mixing the mixed element doped biochar and the iron manganese mineral composite catalyst, and then carrying out ball milling treatment under the protection of an inert atmosphere, so as to obtain the composite catalyst. The heteroelement-doped biochar contained in the catalyst promotes aggregation and electron transfer of pollutants, iron and manganese double metal elements can serve as active sites, the activation efficiency is remarkably improved through the synergistic effect of the iron and manganese double metal elements, and the degradation efficiency of the pollutants is improved.

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 discloses a coking wastewater treatment system. The coking wastewater treatment system comprises a biochemical pretreatment system, a biochemical treatment system, a deep pretreatment system, a deep treatment system, a concentrated water treatment system, a matched dosing system and a sludge treatment system which are connected in sequence, the coking wastewater is used for blast furnace smelting slag flushing after being treated by the coking wastewater treatment system. According to the coking wastewater treatment system, a two-stage A / O process is adopted, meanwhile, an ozone advanced oxidation process is used for oxidizing part of pollutants and decolorizing a water body, the removal effect on COD, ammonia nitrogen, cyanide and other pollutants and chromaticity is enhanced, after ozone is decomposed, a decomposition product is oxygen, secondary pollution is not caused, and no sludge is generated. The coking wastewater treated by the treatment system disclosed by the invention meets the water standard for blast furnace slag flushing.

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.

Systems and methods for producing ultrapure water (UPW) for use in semiconductor fabrication include an ABA module that performs an advanced oxidation process (AOP) pre-treatment step, a bioremediation step, and an advanced oxidation process post-treatment step. Raw water flows through the ABA module, which is part of a water treatment system for producing ultrapure water. The ultrapure water is then used in a semiconductor fabrication process.

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 a preparation method of cobalt nitride nanowires rich in nitrogen vacancies and application of the cobalt nitride nanowires in advanced treatment of antibiotic wastewater. A large number of nitrogen defects are introduced into cobalt nitride through a metal doping method, the adsorption capacity of cobalt nitride on oxygen-containing substances is enhanced, and the main difficult problem restricting application of cobalt nitride in an advanced oxidation process is solved. The catalytic material shows huge application potential in a peracetic acid activation process, and the activation efficiency of peracetic acid and the degradation efficiency of pollutants within 5 min can reach 100%. In addition, the introduction of the nitrogen defect effectively regulates and controls the generation of the selective oxide Co (IV) = O in the process, and the selective removal of pollutants can be realized. And the strain also shows extremely strong pH tolerance and environmental background resistance, and is more suitable for actual wastewater treatment.

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 multiphase high-entropy alloy as well as a preparation method and application thereof, and belongs to the technical field of removing organic pollutants by efficiently activating PMS with a catalyst. According to the multiphase high-entropy alloy, metal atoms comprise five or more of Co, Cu, Mn, Al, La or Cr; the atomic ratio in the multiphase high-entropy alloy is equal in mole, and nitrate hydrate is added into a solvent according to the composition and the proportioning relation of the metal atoms to prepare a precursor solution; and the precursor solution is subjected to pyrolysis, drying, grinding and calcination in sequence, and finally the multiphase high-entropy alloy is prepared. The invention provides a method for simultaneously achieving excellent activation effect and catalyst stability under the condition of no external energy input, and also provides a thought for removing a small amount of overflowing metal ions and a part of incompletely mineralized substances existing in the advanced oxidation process under the conditions of normal temperature and normal pressure. The problem of evaluating the effect of the high-entropy alloy CoCuMnAlLaCr on activating the PMS and degrading and removing the organic pollutants is solved.

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.

Provided are a system for monitoring a hydroxyl radical scavenging index in water using a real-time multi-fluorescence analyzer and a parallel factor analysis apparatus and a method therefor, wherein the system monitors the hydroxyl radical scavenging index in water using the real-time multi-fluorescence analyzer and the parallel factor analysis apparatus, whereby it is possible to monitor the characteristics of an organic material in target water through a continuous flow analysis method without using an existing indicator material, rhodamine B. In addition, in a water treatment system having an advanced oxidation process (AOP) applied thereto in which ozone, ultraviolet rays, hydrogen peroxide, and the like are combined, it is possible to simply calculate the hydroxyl radical scavenging index in the target water through an organic material characteristic index for each component obtained by classifying the characteristic structure of the organic material in water using real-time fluorescence analysis by means of a parallel factor (PARAFAC) model. Accordingly, the amount of chemical injection and the amount of ultraviolet irradiation, which are process control variables, can be controlled, and under given operating variable conditions, the removal rate of a target material in water is predicted, whereby the system can also be used as a diagnostic tool for process evaluation in the advanced oxidation process. Furthermore, the system can provide operational convenience that enables process control while reducing the amount of power consumed in the advanced oxidation process even though the type of target material and the water quality characteristics of raw water change.

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.