35results about How to "Efficient oxidative degradation" patented technology

The invention relates to a coagulating sedimentation agent for treating low-temperature low-turbidity water and belongs to the field of applied chemistry, in particular to the field of coagulating sedimentation treatment agents of low-temperature low-turbidity water. The coagulating sedimentation agent consists of coaly activated carbon powder and oxidized polysilicate aluminium ferric according to a mass-to-volume ratio (mg/mL) of 1:1 to 10:1. The coagulating sedimentation agent is capable of breaking through the limitation that the sedimentation effects of conventional aluminum and iron salt coagulating agents are greatly influenced by factors such as water inlet temperature, suspended solids and turbidity, is taken as a high-efficiency, economic and environment-friendly coagulating agent for treating low-temperature low-turbidity water generated from power plants and water works and industrial water (living water, wastewater and the like), and has high economic benefits and obvious social benefits.

The invention relates to a method for treating printing and dyeing wastewater. The method includes the steps of adding a certain amount of peracetic acid (PAA) and modified straw activated carbon (AC)to wastewater containing azo dye gold orange G under normal temperature and normal pressure; stirring evenly, and reacting for 3 h under the initial neutral pH condition to oxidize and degrade pollutants. By adding peracetic acid and modified straw activated carbon into the printing and dyeing wastewater, the modified straw activated carbon has a certain absorption effect and activates peraceticacid to generate hydroxyl radical oxidation pollutants, thereby degrading the printing and dyeing wastewater. According to the method, rapid, efficient and long-lasting removal of azo dyes in wastewater can be achieved, the reaction conditions are mild, the treatment time is greatly shortened, the process cost is reduced, AC can also be reused to reduce the cost, and the method has broad application prospects in the degradation and removal of azo dyes.

The invention provides a dyeing wastewater oxidation and degradation method based on long-lasting free radical activated persulfate. The method comprises following steps: drying biological sludge in air, grinding biological sludge into biological sludge particles; putting biological sludge particles into a stainless steel reactor, adding deionized water, sealing the reactor, carrying out magneticstirring, heating, carrying out reactions; after reactions, cooling, washing, performing vacuum filtering to obtain sludge based active coke; dispersing sludge based active coke into dyeing wastewater, adjusting the pH to 6.8-7.6, adding persulfate, performing vibration at a room temperature, after reactions, carrying out solid-liquid separation, allowing the supernate to stand still for a while,and then measuring the absorbance and total organic carbon content. The technological process is simple, the secondary pollution is small, the discoloring rate is high, the cost is low, and the energyconsumption is low. Long-lasting free radical activated persulfate on the surface of sludge based active coke is used to generate sulfate free radicals, hydroxyl free radicals and singlet oxygen witha strong oxidative performance, the sulfate free radicals, hydroxyl free radicals and singlet oxygen can rapidly degrade dye molecules, and thus the method has a wide application prospect in engineering.

The invention discloses an N-doped graphene-cerium oxide composite catalyst. A preparation method of the N-doped graphene-cerium oxide composite catalyst comprises the following steps: (1) adding a CeO2 precursor, a carbon source and a nitrogen source into water, stirring evenly, and drying; (2) grinding a dried solid, roasting under the protection of nitrogen gas, cooling to obtain the N-doped graphene-cerium oxide composite catalyst. The invention further discloses the application of the N-doped graphene-cerium oxide composite catalyst to the treatment of degradation-resistant acid wastewater. The N-doped graphene-cerium oxide composite catalyst can effectively catalyze the oxidation of ozone under the acid or strong acid condition to degrade an organic pollutant.

The invention discloses a method for treating high-concentration alkaline resin desorption liquid by a catalytic ozonation technique, and belongs to the field of wastewater treatment by the ozonationtechnique. The method includes the steps: (1) enabling industrial wastewater to enter a wastewater adjusting tank to perform biological treatment, and discharging biochemical tail water after biological treatment; (2) conveying the biochemical tail water into ion exchange resin to perform resin adsorption and desorption treatment; (3) performing alkali liquor elution on the ion exchange resin after resin adsorption and desorption treatment, and recycling alkaline resin desorption liquid; (4) adding the aluminum chloride and ozone into the recycled alkaline resin desorption liquid to perform ozone catalyzed oxidation treatment; (5) adjusting a pH (potential of hydrogen) value of the resin desorption liquid after ozonation to reach 6-8, performing flocculant precipitation, and conveying theresin desorption liquid into the wastewater adjusting tank to be circularly treated. According to the problem that biochemical treatment of existing high-concentration alkaline resin desorption liquidis difficult as alkalinity is high. According to the method, the high-concentration alkaline resin desorption liquid is treated by the catalytic ozonation technique, and the biodegradability of the resin desorption liquid can be improved.

The invention discloses a water treatment agent based on laminated composite metal hydroxide and a preparation method of the water treatment agent. The water treatment agent is prepared from the laminated composite metal hydroxide and hydrogen peroxide under the action of a stabilizer under a low-temperature condition, wherein the ratio of divalent metal ions to trivalent metal ions in the laminated composite metal hydroxide is at 2: 3-5: 1; carbonate anions are intercalated between laminae; the stabilizer is magnesium sulfate, magnesium nitrate, sodium stannate or organic phosphate; the ratio of the stabilizer to the hydrogen peroxide is 0.3-0.6%; and the multifunctional efficient water treatment agent is prepared in accordance with a technological process comprising the following steps: preparing the laminated composite metal hydroxide, conducting ethanol recrystallizing, conducting drying and grinding, adding obtained powder to the hydrogen peroxide containing the stabilizer, conducting stirring in an ice bath, conducting suction filtering and conducting drying. The water treatment agent, when applied to wastewater treatment, can solve the problem of a conventional water treatment agent which is difficult in regeneration. The treatment agent is simple in preparation process and low in cost; and the treatment agent can be applied to wastewater in a large scale so as to simultaneously and efficiently remove various pollutants, and the treatment agent can be regenerated easily.

The invention belongs to the technical field of chemical engineering and environmental protection, and discloses a method for repairing combined pollution soil and an equipment system therefor. The method comprises the following steps: (1) uniformly mixing and stirring the composite contaminated soil, a catalyst and a passivator; (2) preheating the uniformly mixed solid material to 150-400 DEG C,and adding the preheated solid material into a reactor from the upper end; (3) preheating water to 150-400 DEG C, and adding the preheated water into the reactor from the lower end; (4) preheating anoxidizing agent to 150-400 DEG C, and adding the oxidizing agent into the reactor from the lower end; (5) introducing the reacted material into a solid separator, and separating the solid material; (6) adjusting the temperature and the pressure of the separated fluid; and (7) introducing the fluid into a gas-liquid separator, and separating out gas and liquid. The method provided by the inventionnot only realizes efficient oxidative degradation of organic pollutants in the combined polluted soil, but also realizes passivation treatment of heavy metal ions, and provides an adaptive equipment system.

The invention discloses a catalysis for advanced oxidation degradation of organic wastes in wastewater. A preparation method of the catalyst comprises the steps: regulating the pH value of a sodium silicate solution to be within the range of 12-13 by using sulfur acid or sodium hydroxide to form a clear solution; mixing a soluble metal salt solution with a sodium silicate solution, and carrying out a neutralization and sedimentation reaction to generate a silica gel and metal hydroxide doped sediment, regulating the PH value of the mixed solution to 6-8 by using dilute sulfur acid, then, keeping mixing, and further carrying out an aging reaction; and carrying out filtering separation and drying treatment on the reacted and aged sediment, then, adding an additive accounting for 5-12% of themass of the sediment, carrying out mixing, extruding the mixture by using a die to form a blank body with a honeycomb structure, drying the blank body, and roasting the blank body at the temperatureof 400-600 DEG C to obtain catalyst honeycomb filler with high specific surface area.

The invention discloses an electrochemical biofilm filter assembly for enhancing degradation of an intermediate product, a reactor with the assembly and application of the assembly in enhancing degradation of the intermediate product in sewage treatment. The assembly is suitable for decentralized and centralized sewage treatment. According to the assembly, two titanium meshes serve as cathodes andare arranged on the two sides of the membrane assembly respectively, a titanium-based tin-antimony electrode serves as an anode and is arranged on the inner sides of the two titanium meshes to form aclosed membrane cavity, a water outlet pipe and a peristaltic pump are connected above the membrane cavity, and the peristaltic pump operates in a pumping stop mode. Under a certain external voltage,hydroxyl radicals are generated on the surface of the anode, sewage is sucked into the membrane cavity through the titanium mesh cathodes, and when the sewage flows through the surface of the anode,organic pollutants in the water are oxidized and degraded. Meanwhile, a layer of attached biological membrane is gradually formed on the surfaces of the outer sides of the titanium meshes, oxidative degradation products of organic pollutants make contact with the biological membrane on the surface of the titanium mesh in a pumping stop mode, enhanced degradation is achieved, and therefore efficient degradation of the organic pollutants is achieved.