7 results about "Sulfate radical" patented technology

This invention discloses a method and system for the synergistic degradation of COD and new pollutants in industrial wastewater based on catalytic reduction-oxidation. The method includes: adjusting the pH of dyeing and printing wastewater containing perfluorinated compounds (PFCs) to alkaline; adding a reducing agent (sulfite) and a catalyst (alkali metal iodide); then carrying out a catalytic reaction under ultraviolet light irradiation and stirring; adding an oxidizing agent (persulfate PMS) and a catalyst (ferrous sulfate) to the effluent after catalytic reduction; and carrying out a catalytic oxidation reaction under light-proof and stirring conditions. The ferrous sulfate activates the PMS to generate sulfate radicals, completely mineralizing the short-chain fluorine-containing intermediates generated in the reduction stage into CO2 and F. ‑ Simultaneously, it degrades residual organic matter. The method of this invention can efficiently and thoroughly degrade perfluorinated compounds in actual dyeing and printing wastewater, and has strong anti-interference ability, low operating cost, and no secondary pollution.

This invention relates to a method, system, and application for remediating black and odorous sediment. The remediation method includes the following steps: homogenizing the black and odorous sediment; detecting the ferrous content of the sediment and calculating the amount of persulfate to be added based on the molar ratio; using the ferrous-rich sediment as an activator, adding persulfate and stirring to mix the persulfate and sediment for reaction; adjusting the stirring time; using ferrous activator to generate sulfate free radicals from the persulfate, which oxidize the black and odorous substances, causing heavy metals to leach out; centrifuging and filtering the mixture, collecting the interstitial water containing heavy metals, and washing the mixture to obtain harmless sediment. The remediation method of this invention can achieve Fe... within 5 minutes. 2+ With a removal rate of ≥79% and an AVS removal rate of ≥89% within 2 minutes, the leaching rates of Zn, Mn, Ni, and Pb in black and odorous sediment can reach 41%, 32%, 19%, and 17%, respectively, which belongs to the field of environmental engineering technology.

The application relates to a method for selectively leaching silver in zinc leaching residue by ultrasonic reinforced persulfate oxidation, and belongs to the technical field of hazardous solid waste resource utilization. The zinc leaching residue is dried and crushed to obtain zinc leaching residue powder; the zinc leaching residue powder is added into a sodium persulfate solution, and ultrasonic reinforced leaching reaction is carried out under the action of ultrasonic waves at a temperature of 50-80 DEG C for 60-180 min, solid-liquid separation is carried out, and leaching residue rich in valuable metals and silver-containing leaching solution are obtained. The application innovatively utilizes sodium persulfate to generate high-oxidation-activity sulfate radicals under the action of ultrasonic waves and in-situ release of Ag + Under the action of double activation, high-oxidation-activity sulfate radicals are generated, a continuous strong oxidation environment is formed, and the oxidation leaching of silver is significantly promoted; meanwhile, the method can selectively retain valuable metals such as zinc and iron in the form of oxides in the residue, realizes efficient separation of silver and synergic enrichment of valuable metals, and has the advantages of high silver leaching rate, fast leaching speed, simple operation, low cost, environmental friendliness and the like.

The present application belongs to the technical field of inactivation of pathogenic microorganisms in water bodies, and discloses a method for inactivating pathogenic microorganisms in water bodies by activating persulfate oxidation with Bordeaux mixture and application thereof. The method is as follows: Bordeaux mixture is added to water bodies contaminated with pathogenic microorganisms, and then a persulfate solution is added to form a reaction system, and the reaction system is shaken at room temperature to simulate real water bodies, so as to inactivate the pathogenic microorganisms. The present application provides a new method for inactivating pathogenic microorganisms such as Escherichia coli and Enterococcus faecalis in water bodies. Sulfate radicals and hydroxyl radicals are generated by activating persulfate with Bordeaux mixture, and alkaline copper sulfate and calcium sulfate precipitate and flocculate and settle the pathogenic bacteria residues in cooperation. The inactivation effect of the Bordeaux / PS system within 5 minutes reaches more than 99%.

The application relates to the field of high-value utilization of lignocellulosic biomass, in particular to a preparation method and application of a divalent iron-loaded amphiphilic cellulose, and a divalent iron-loaded amphiphilic cellulose material is obtained, and the problems of uneven release of divalent iron and low reaction efficiency in traditional technologies are solved. The material can release ferrous ions at the oil-water interface in a directional manner, high-concentration sulfate radicals are generated through the reaction of the ferrous ions and persulfate, so that the oxidation capacity is significantly improved, and demulsification is effectively realized.

This invention discloses a fluorine-free etched Ti3C2-supported Cu 2‑x Preparation and application methods of Se catalysts, and the synthesis of Cu by coprecipitation and hydrothermal methods. 2‑x A composite catalyst of Se and magnetic metal oxides was used to activate PMS for the degradation of SMX in water. This achieved rapid and efficient degradation of SMX at room temperature and pressure, while ensuring low dissolution, high stability, and easy recovery of the magnetic metal oxide composite catalyst. In the magnetic metal oxide composite catalyst, Cu... 2‑x Se, as the core catalytic active center, is used to activate PMS to generate sulfate radicals and hydroxyl radicals; magnetic metal oxides, on the one hand, act as magnetic supports, endowing the composite material with magnetic separation and recovery characteristics, and on the other hand, their variable valence metal pairs can react with Cu. 2‑x Se synergistically catalyzes the activation of PMS. This invention can rapidly degrade SMX at room temperature and pressure, achieving a degradation rate of over 90% within 40 minutes.

This application provides an oxidative relay slow-release agent, its preparation method, and a method for remediating organic-contaminated soil or groundwater, relating to the fields of environmental engineering and pollution remediation technology. The oxidative relay slow-release agent comprises a core and a shell disposed on the surface of the core; the core comprises potassium permanganate and an inert porous support material; the shell comprises loaded sodium persulfate particles and a biodegradable polymer. The degradation or permeability of the shell is configured to allow water infiltration, causing the potassium permanganate to be released first. Its reaction product, manganese dioxide, then acts as a catalyst, activating the delayed-release sodium persulfate on the shell, generating sulfate radicals for deep oxidation, thereby forming a highly efficient "oxidative relay."