536 results about "Activated persulfate" patented technology

The invention discloses a method for degrading organic pollutants in a water body through an activator composite material and activating persulfate, belonging to the technical field of water pollution control. According to the method, the activator composite material comprises nano zero-valent iron and biochar; the activator composite material and persulfate react with the organic pollutants when being existent at the same time so as to degrade the organic pollutants in the water body. The method comprises the following concrete steps: 1, adding persulfate into the water body containing the organic pollutants, wherein the molar ratio of persulfate to the organic pollutants is (20 : 1) to (200 : 1); 2, adding the activator composite material while stirring, wherein the molar ratio of the activator composite material and persulfate is 1 : 1. The method has the advantages that generated free radicals are good in oxidation property, a reaction system is stable, the pH range is wide, the utilization rate of an oxidant is high, and the like; in addition, the method has wide application prospects on aspect of repairing the organic polluted water body.

The invention discloses a water treatment method utilizing complex-ferrous-activated persulfate oxidation. The treatment method comprises the following steps: (1) firstly determining the pH value and CODcr (chemical oxygen demand) value of wastewater to be treated; (2) adding a complexing agent which is selected according to the pH value to the wastewater, and then adding ferrous ion to the wastewater for sufficiently mixing; and (3) adding a persulfate to the wastewater treated in the step (2) according to the CODcr value for full reaction to obtain purified wastewater. The method is applicable to the wastewater with various pH values; by using the method, the acid feeding cost is greatly reduced and the treatment cost of per ton of wastewater is lowered by approximate 20%; in addition, complex ferrous can slowly release free ferrous ion, thus ensuring that organic pollutants in the wastewater are durably and efficiently purified by a persulfate oxidation method and increasing the pollutant removal efficiency by 20-30%; and the method has the advantages of good durability and high efficiency, is environmentally-friendly, is easy to operate, and has great application potential in the field of environmental pollution treatment.

The invention discloses a method for treating organic wastewater by using double catalysts to heterogeneously activate persulfates, belonging to the technical field of water pollution control. According to the method, nano copper oxide and zero-valent iron particles are used as a combined catalyst to activate the persulfates to generate free sulfate radicals with strong oxidizing property, so that refractory organics are removed from the wastewater. Compared with a homogeneous persulfate water treatment technology, the method has the advantage that the heterogeneous catalysts can efficiently and continuously activate the persulfates to achieve a heterogeneous activation effect due to the properties of relatively large specific surface area, relatively high catalytic activity and the like. The double-catalyst heterogeneous persulfate activation water treatment technology established by the method disclosed by the invention is applicable to treatment of various kinds of organic wastewater, is high in efficiency, good in durability and convenient in operation, can efficiently remove toxic and harmful pollutants from the wastewater within a relatively wide pH range, provides a broad prospect for treating toxic, harmful and non-biodegradable organic wastewater, and has a great application potential in the field of environmental pollution treatment.

The invention discloses a method for degrading organic waste water by activating persulfate through manganese-cobalt composite oxide. The method includes the following steps that under the normal temperature condition, the persulfate with the concentration of 0.5-5.0 mM and the manganese-cobalt composite oxide with the concentration of 0.1-2.0 g/L are added into the waste water containing organic pollutants, the water sample is treated for 20 min-3 h, then solid-liquid separation is carried out, and the treatment process is completed. The heterogeneous manganese-cobalt oxide is adopted as a catalyst and can efficiently and continuously activate the persulfate to generate sulfate free radicals and hydroxyl free radicals to degrade the organic pollutants. Serving as an environment-friendly material, the manganese oxide can effectively reduce leakage of cobalt ions and reduce secondary pollution and biotoxicity. The method is suitable for treatment on various kinds of organic waste water, high in efficiency and persistence, capable of being used repeatedly and convenient to operate and provides wide prospects for treatment on the degradation-resistant organic waste water.

The invention discloses a method for treating trace non-degradable organisms in water by the aid of heterogenous sulfate radical oxidation. The method includes feeding zero-valent iron into the water to be used as a stable Fe2+ source; generating high-oxidability sulfate radicals by means of activating persulfate; leading the sulfate radicals to oxidize and degrade the track non-degradable organisms in the water; and accordingly achieving the purpose of removing target pollutants. The method is wide in applicable pH (potential of hydrogen) range and can realize an excellent effect in acidic water and neutral water. In addition, the added zero-valent iron can be slowly and continuously converted into Fe2+, and accordingly the sulfate radicals can be obtained by means of continuously and efficiently activating the persulfate. Besides, the method is low in cost, high in treatment efficiency and flexible in operation method, and has a high potential in the technical field of treatment of micro-polluted water.

The invention discloses a catalyst for activating persulfate and application of the catalyst in catalysis of persulfate for contaminant removal. The solid catalyst is prepared by using the following steps: (1) immersing a carrier in water completely, performing stirring so as to wet the carrier sufficiently and obtain slurry; (2) adding a metal salt including a copper salt to the slurry, performing thorough and even mixing, controlling the pH value at 3 or below, and performing impregnation so as to load metal ions onto the carrier; (3) adding an alkaline substance to the mixed system obtainedin the step (2) so as to control the pH value of the system at 7 or above, performing stirring for a reaction at 10-40 DEG C for 30-240 minutes, and separating the solid; (4) washing the solid with water at a pH value of 7-14; and (5) performing drying or natural airing on the solid obtained in the step (4) at 100 DEG C or below so as to obtain the solid catalyst for activating persulfate. The catalyst can be applied to catalysis of persulfate for contaminant removal, high-oxidbility free radicals can be generated by the catalyzed persulfate, and the catalyst has the advantages of safety, high efficiency, stability and wide application.

The invention discloses a preparation for a modified MIL-53(Fe) metal organic framework and a method for treating organic wastewater with activated persulfate thereof. Compared with unmodified MIL-53(Fe), the modified MIL-53(Fe) metal organic framework compounded according to the invention contains more ferrous reactive metal centers. The modified MIL-53(Fe) metal organic framework used as a catalytic active site can enhance the effective contact between the metal organic framework material and the persulfate so as to generate free radicals of sulfate with strong oxidizing property, so that the refractory pollutants in wastewater can be effectively removed. The modified MIL-53(Fe) metal organic framework has higher material stability, can maintain the stability of the crystal structure after the catalytic activation reaction of persulfate and can still maintain higher catalytic activity after repeated cyclic utilization. The method for treating organic wastewater according to the invention has the advantages of environmental protection, simple and convenient operation, low cost, high catalyst activity, high reusability, and the like. Besides, the method is also suitable for the treatment of various organic wastewaters.

The invention relates to a method for pre-treating organic industrial wastewater based on ferric-carbon micro-electrolysis activated persulfate. The method comprises the following steps: adding iron Fe and carbon C into a reactor in which to-be-treated wastewater is filled, regulating the pH value of the wastewater to 3.0-6.0 and carrying out aeration; adding persulfate into the reactor, starting reaction, and ending the reaction within 0.5-3 hours; carrying out coagulating sedimentation on reacted mixed liquor to regulate the mixed liquor to be basic, adding a coagulant aid into the basic mixed liquor, stirring the basic mixed liquor, and settling the basic mixed liquor to obtain liquid supernatant which is pollutant-treated outlet water. According to the method, the problems that conventional Fe<2+> activated persulfate reaction rate is too high and the reaction is liable to stop are solved. The method is used for pre-treating various high-concentration degradation-resistant organic industrial wastewater, is high in efficiency, convenient to operate and environmentally-friendly, and wide prospect is provided for treating the degradation-resistant industrial wastewater.

The present invention discloses a copper-doped iron metal-organic framework, a preparation method thereof, and an application method for activation of persulfate to treat organic wastewater. The copper-doped iron metal-organic framework is prepared by solution impregnation method, using relatively large specific surface area and more hollow structures of the iron metal-organic framework to effectively load copper ion. This method uses the unsaturated-coordinate iron active center on the iron metal-organic framework and copper ions on the load as a catalyst body, utilizing catalytic synergies of both to efficiently and continuously activate persulfate to produce sulfate radical anion for degradation of organic pollutants. This method is suitable for various organic wastewater, with high catalytic activity, good durability, easy operation and easy recovery, and activation effect of this heterogeneous catalyst is still high even after being used repeatedly, having a great application prospect in degradation of organic pollutants in water.

The invention discloses a method for processing papermaking wastewater by an advanced oxidation treatment of activating persulfate or monoperoxy-hydrosulfate with ferrous salt. The method is divided into two phases, namely an oxidation phase and a precipitation phase; wherein the oxidation phase is carried out in advanced oxidation equipment where wastewater is prone to mix, the hydraulic retention time is more than 0.5 hour, then persulfate or monoperoxy-hydrosulfate is subjected to carry out reactions with ferrous salt to generate sulfate free radicals with a strong oxidizing property, the sulfate free radicals can degrade organisms in the wastewater; the precipitation phase is carried out in precipitation equipment, the hydraulic retention time is more than 1.5 hours, and an alkaline solution or polymerized aluminum chloride is added so as to promote the flocculation and sedimentation of iron mud. The papermaking wastewater processing method is based on sulfate free radical advanced oxidation treatment, and the processed wastewater is clear and has a low COD value and a low Cr content. The method has the advantages of high efficiency, easy operation, and wide applicable pH range, and is especially suitable for processing papermaking wastewater having complicated components and high requirements on advanced treatment.

The invention discloses a water treatment method of zero-valent iron-copper bi-metal activated persulfate. The water treatment method specifically comprises the steps that bi-metals including zero-valent iron and copper are added into water containing micro-pollutants, then persulfate is added, full mixing is performed, the bi-metals including the zero-valent iron and the copper are utilized to activate the persulfate so as to remove the micro-pollutants in the water. The water treatment method utilizes the bi-metals including the zero-valent iron and the copper to efficiently activate the persulfate so as to produce free sulfate radicals having strong oxidizing property, can achieve the purpose of quickly and thoroughly removing micro-pollutants, including multiple types of poisonous and harmful micro-pollutants in water, such as polychlorinated biphenyl, brominated flame retardants, drugs and personal care products (PPCPs) and algal toxin, and has the advantages of high activation efficiency, high oxidation and degradation efficiency of pollutants, wide pH using range, convenient operation and the like. The water treatment method can be applied to underground water remediation, treatment of industrial water (including electroplating wastewater, hospital wastewater, printing and dyeing wastewater and the like), drinking water treatment, wastewater treatment and the like.

The invention relates to an activated carbon loaded iron-cobalt oxide catalyst of which the components and content in weight percentage are that: 80.0 percent to 99.0 percent of activated carbon and 1.0 percent to 20.0 percent of iron-cobalt bi-metal oxide, wherein the cobalt and iron mole ratio is 1:1 to 1:19. The catalyst is integrated with ultrasonic wave and persulfate, and is used for treating organic wastewater. The catalyst and the persulfate are used for treating the organic wastewater with azo dye orange II as a target pollutant, and the decolorization rate reaches 74.5 percent within 30min; after the ultrasonic wave is added, the decolorization rate can be improved to 81.2 percent within 30min, and the total organic carbon (TOC) removal rate can reach 43.4 percent. The catalyst has the advantages of high catalytic efficiency and low metal ion dissolution rate. The catalyst is integrated with the ultrasonic wave and the activated persulfate to treat the organic pollutants in the wastewater, the treatment is carried out under milder conditions, the method is simple, the cost is low and the treatment effect is good.

The invention discloses a method for purifying flue gas through activating persulfate by ozone, and an apparatus thereof. Ozone in the flue gas contacts with persulfate in a solution in a bubbling-spray two stage reactor to generate sulfate radicals and hydroxy groups having strong oxidizability in order to oxidize and remove SO2, NOx, mercury, H2S and VOCs in the flue gas; and a reaction product solution enters a mercury separation tower to remove mercury, a mercury removed sulfuric acid and nitric acid solution enters an ammonia feeding tower, an ammonium sulfate and ammonium nitrate solution generated through the above reaction enters a product crystallization tower, and a flue gas waste heat utilizing device is used to evaporate and crystal recyclable agricultural fertilizers ammonium sulfate and ammonium nitrate. In the invention, ozone is adopted to induce persulfate to generate the sulfate radicals and hydroxy groups having extremely strong oxidizability, and the oxidbillities of the sulfate radicals and the hydroxy groups are second to that of fluorine, and are far higher than that of single ozone or persulfate, so the five pollutants can be efficiently simultaneously removed.

The invention provides a construction and application method of a photoassisted porous copper bismuthate activated persulfate water treatment high-grade oxidation technology, and belongs to the field of water treatment technologies and environmental functional materials. The shape of porous copper bismuthate can be powder or particles, and a porous copper bismuthate material with a high specific surface area is prepared by using bismuth nitrate, copper nitrate and polyvinylpyrrolidone as main materials, so the coumarin degradation ability of free radicals generated in the activation process of persulfate under photoassisted conditions is improved. The novel porous copper bismuthate is provided as a catalyst to solve the problem of poor coumarin removal effect of present routine sewage treatment, realizes successful application in a persulfate system, provides theoretic reference for coumarin compound removal technologies, and provides scientific basis and technical support for water safety and water environment improvement.

The invention discloses a method for degrading organic matters in water by an activated persulfate coupling system, and is realized through the following steps: firstly, preparing TiO2 porous microspheres; then, preparing FeCo/TiO2; finally, fully mixing the FeCo/TiO2 with aqueous solution which contains organic matters, adding the persulfate, meanwhile, irradiating by ultraviolet rays, and activating to generate SO4<->. and.OH under the synergistic effect of the FeCo/TiO2 and ultraviolet light so as to degrade most parts of organic pollutants in wastewater. The method has a simple processing technology, the organic wastewater can be subjected to up-to-standard emission only through one-step reaction, cobalt ion and iron ion dissolution rates are extremely low, environment pollution is lightened, organic matter degradation efficiency in the wastewater is higher under acidic, neutral and alkaline conditions, and the stable treatment of the organic wastewater under a situation of various pH (Potential of Hydrogen) values is realized.

The invention belongs to the field of water pollution control, and particularly relates to a nitrogen-doped porous carbon polyhedron@nanometer cobalt phosphide composite catalyst capable of efficiently activating persulfate and a preparation method of the composite catalyst. The preparation method comprises the steps that basic cobaltous carbonate nanowires are prepared by using a hydrothermal method, the basic cobaltous carbonate nanowires are phosphorized to obtain cobalt phosphide nanowires, a metal-organic framework ZIF-8 grows around the cobalt phosphide nanowires by using a self-assemblymethod, and through high-temperature calcination, the nitrogen-doped porous carbon polyhedron@nanometer cobalt phosphide composite catalyst is obtained. Compared with an existing heterogeneous catalyst, the composite catalyst has nonmetal catalysis activity and metal catalysis activity and is high in persulfate activating efficiency, high in free radical production, wide in pH application range and capable of being recycled and widely used, obviously reducing the consumption of a catalyst and a oxidizing agent and shortening reaction time.

The invention discloses a preparation method and application of a self-activated persulfate oxidized medicament. The self-activated persulfate oxidized medicament is prepared from persulfate, an activator, an adhesive and a dispersant, wherein the molar ratio of persulfate and the activator is (0.5:1)-(5:1), and based on the weight of a mixture of persulfate and the activator, the addition of the adhesive is 10-15% and the addition of the dispersant is 1-5%. Persulfate and calcium peroxide mixed in a certain proportion and prilled and moulded are applied to repairing polluted water and sites, so that the medicament is self-activated without additionally adding the activator, thereby overcoming the problem that the medicament is non-uniform to mix, extremely simplifying the construction operation and improving the treatment efficiency.

The invention discloses a method for treating water by using zero-valent iron-nickel bi-metal activated persulfate. According to the method, the zero-valent iron-nickel bi-metal activated persulfate is used, and micropollutants in the water are removed. The zero-valent iron-nickel bi-metal activated persulfate is used for efficiently generating high-oxidizing-property sulphate radical and high-oxidizing-property hydroxyl radical to attack the micropollutants, the micropollutants are degraded, and the purpose of quickly and thoroughly removing various poisonous and harmful micropollutants such as polychlorinated biphenyl, brominated flame retardants, medicines, personal care products (PPCPs) and algal toxin can be achieved. Compared with the existing the method for treating water by using zero-valent iron activated persulfate, the method has the advantages of high activating efficiency, high yield of the sulphate radical, high micropollutants removing efficiency and the like, is convenient and easy to operate, obvious in effect and wide in pH (potential of hydrogen) using range, and can be used for ground water remediation, treatment of industrial water comprising electroplating wastewater, wastewater of hospitals, printing and dyeing wastewater, treatment of drinking water, treatment of sewage and the like.

The invention discloses a method for degrading organic pollutant in water through activated persulfate. The method comprises the steps that 1, an alkali medicament solution is prepared to be used as a solution A; 2, a divalent metal salt and trivalent metal salt mixed solution B is prepared according a certain proportion; 3, the alkali medicament solution A is added into the solution B, and stirring is performed continuously for 30-120 min to obtain a composite solution; 4, the composite solution is heated, the temperature of 50-80 DEG C is kept constant, standing is performed for 4-24 h, and the composite solution is taken out after being cooled to obtain an emulsion C; 5, the cooled emulsion C is added into a water sample to be processed, and a persulfate solution of the certain mass concentration is added, stirring is performed for a reaction, the persulfate is activated by the emulsion to degrade organic matter in the water sample to be processed to be converted into sulfate ions which are absorbed by emulsion particles, the organic matter is degraded and secondary pollution is eliminated. According to the method, after being used for activating the persulfate, the emulsion finally forms metal hydroxide precipitates, adverse effects are generated for follow-up processes, and the method is applied to processing printing and dyeing wastewater with 10 mg/L rhodamine and has the high removal rate.

The invention discloses a simulation test apparatus for persulfate hot-steam activated advanced oxidation ex-situ restoration of contaminated soil and a simulation test method thereof. The apparatus comprises a liquid reagent conveying unit, a steam generating and conveying unit and a multifunctional crushing, stirring and sprinkling unit and a matched enclosed stirring container unit thereof, wherein the multifunctional crushing, stirring and sprinkling unit comprises a hollow crushing and mixing shaft provided with a plurality of hammer type blades and sprinkling holes, and a liquid reagent and steam pass through the crushing and mixing shaft. The method comprises the following steps: preparation of a persulfate solution; preparation of hot steam; addition of soil; preliminary crushing and mixing; sprinkling of the persulfate solution; injection of the hot steam; up-and-down separation of a container; analysis of soil properties and sample acquisition; and data analysis. According to the invention, full mixing of the persulfate solution with contaminated soil is realized under the condition of low soil moisture content; and as steam is injected into soil for heating so as to realize activation of persulfate, restoration effects of activated persulfate on organic pollutants in soil are simulated.