513 results about "Fenton reagent" patented technology

The invention relates to a process method for treating hardly-biodegradable organic wastewater, and the method comprises the following steps: mainly utilizing the combination of ultraviolet light, electrochemistry, ultrasonic waves and oxidation-reduction chemical reaction for treating the hardly-biodegradable organic wastewater, and treating the wastewater by three reaction units of an ultrasonic cavitation zone, an electrochemical reaction zone and an ultraviolet light catalytic reaction zone, thereby realizing the high-efficient multi-stage deep wastewater oxidation reaction which combines the ultrasonic wastewater treatment method, the ultrasonic light and the collaborative Fenton reagent oxidation wastewater treatment, as well as the electrochemistry and the collaborative Fenton reagent oxidation wastewater treatment, effectively treating a variety of types of hardly-biodegradable organic wastewater and leading the COD removal rate of the wastewater after the treatment to be more than 90%.

Disclosed are a preparation method and application of heterogeneous Fenton-like catalyst. The preparation method includes the steps of firstly, dissolving complexing agent and metal salt in distilled water to respectively prepare complexing agent and metal salt solutions; secondly dropwise adding the metal salt solution into the complexing agent solution under the action of a magnetic mixer, and mixing for 20-60 after dropwise addition to obtain metal complex solution; and thirdly, impregnating activated carbon fiber in the metal complex solution for 1-24h, and subjecting taken-out activated carbon fiber to distilled water washing and drying to obtain the heterogeneous Fenton-like catalyst. The preparation method is simple, and conditions are mild. Environment-friendly hydrogen peroxide is used as oxidant, no extra ultraviolet light or even visible light is needed, and the heterogeneous Fenton-like catalyst is capable of efficiently degrading organic pollutants such as dye within a wide pH range of 2-10. The heterogeneous Fenton-like catalyst is well repeatable, and secondary pollution of the homogeneous Fenton reagent caused by iron ions is avoided.

The invention relates to a coal chemical wastewater treating technique, which comprises the following steps of: pretreating the coal chemical wastewater by an air-floatation device and obtaining pretreated wastewater; adding a fenton reagent into the pretreated wastewater to carry out secondarily treatment and obtaining secondarily treated wastewater; putting the secondarily treated wastewater into an activated sludge aeration pool and adding active carbon powder into the pool for deep treatment to obtain deeply treated wastewater; separating the deeply treated wastewater with a hyperfiltration membrane and obtaining separated recycled water; reversely penetrating the separated recycled water with a selective semi-permeable membrane and obtaining reversely penetrated recycled water; evaporating and crystallizing the reversely penetrated recycled water and finishing the wastewater treatment. The wastewater, after treated by the coal chemical wastewater treating technique, can realize the 'zero discharge' standard, meet the national environmental requirements, and obtain good economic and social benefits.

The invention provides a sludge-dewatering compound conditioning agent and an application method thereof. The sludge-dewatering compound conditioning agent comprises a Fenton reagent or / and similar Fenton reagent and a skeleton construct, and the weight ratio of the Fenton reagent or / and similar Fenton reagent and the skeleton construct is 1: (0.05-300); and the skeleton construct adopts a powder body. The application method comprises the following steps: adding the Fenton reagent or / and similar Fenton reagent into sludge slurry, and mixing for oxidation; and adding the skeleton construct into the sludge slurry with the Fenton reagent or / and similar Fenton reagent, and mixing. Due to synergy of the Fenton reagent or / and similar Fenton reagent and the powder type skeleton construct, extracellular polymeric substances in sludge can be destructed effectively, the compressibility of organic substances can be reduced, and the sludge dewatering performance of the sludge-dewatering compound conditioning agent can be improved greatly. The procedures of the application method are simple, the conditions can be controlled easily, the sludge dewatering time can be shortened, and the large-scale treatment of the sludge can be realized.

The invention discloses a method for preparing a catalyst for treating high-concentration organic wastewater through catalytic oxidation, which comprises the following steps: 1) drying a cocoanut active charcoal at a temperature of between 100 and 120 DEG C for 8 to 15 hours, taking out and adding the cocoanut active charcoal into 2 to 10 percent sulfuric acid solution to perform soakage for 12 to 36 hours, adding the cocoanut active charcoal into a 1 to 10 percent oxydol solution to perform soakage for 12 to 36 hours, taking the cocoanut active charcoal out, and draying the cocoanut active charcoal in shade to obtain an activated charcoal for standby; and 2) soaking constant volume of the activated charcoal into transition metal salt solution for 12 to 36 hours, drying the activated charcoal at a temperature of between 100 and 120 DEG C for 8 to 15 hours, and calcining the activated charcoal at a temperature of between 300 and 650 DEG C for 3 to 8 hours to obtain the catalyst for treating the high-concentration organic wastewater through the catalytic oxidation. The service life of an active charcoal catalyst bed prepared by the method can reach over 0.5 to 1 year. After the treatment of the wastewater, compared with a Fenton reagent, the treatment efficiency of the catalyst is improved obviously, and the treatment cost is reduced by about 20 percent.

The invention discloses an advanced treatment method for fracturing flow-back fluid, belongs to the field of water treatment of the development of oil and gas fields, and particularly relates to an advanced treatment method for the fracturing flow-back fluid generated during the operation of the oil and gas fields. The treatment method for the fracturing flow-back fluid, which has high effect and continuous treatment process, is provided to solve the problems that the treatment effect is lower, the continuous treatment cannot be performed, and the cost is higher existing in the prior art. The method comprises the following steps of: pre-oxidizing waste liquor with the pH value of between 8 and 12, adding a coagulant and performing gel breaking treatment and adding a Fenton reagent and treating, and performing secondary coagulation and oxidization treatment. In the method, through homogeneous and heterogeneous catalysis reactions, the treatment cost is reduced, and the removal rate of organic substances is also high; and chemical oxygen demand (COD) of effluent can meet the national sewage discharge standard.

The invention relates to the field of chemistry, in particular to the treatment of contaminants. A sulfide-containing industrial wastewater treatment reagent comprises a Fenton reagent containing an iron source and hydrogen peroxide, and also comprises sulfide, wherein the sulfide is mixed in the Fenton reagent to be used as a cocatalyst of the Fenton reagent. Compared with the traditional homogeneous Fenton reaction system, the cheap and readily available sulfide is used as the cocatalyst, so that the catalytic reaction is firstly carried out on the surface of the sulfide to improve the efficiency of decomposition of hydrogen peroxide to generate hydroxyl radicals during the Fenton reaction process and improve the degradation efficiency and the utilization efficiency of the hydrogen peroxide, and the sulfide per se can be recycled, and the problem of producing a large amount of iron sludge by homogeneous Fenton can be avoided, thereby reducing the treatment cost.

The invention discloses a regeneration method for activated carbon adsorbed and saturated by refractory organics. The regeneration method for the activated carbon adsorbed and saturated by the refractory organics adopts Fenton reagents to oxidize and regenerate the activated carbon that absorbs disperse dye waste water. The regeneration method particularly comprises the steps as follows: the collaborative cleaning function and the catalytic action of ultrasonic waves are utilized, ferrous iron ions react with oxydol under the acidic condition to generate -OH; in addition, -OH has very high oxidative potential, so that -OH can oxidize the organics absorbed on the surface of the activated carbon into low molecular weight organics or mineralize the organics absorbed on the surface of the activated carbon to generate CO2 and H2O without selectivity, so as to lead the activated carbon to restore the adsorption activity. The regeneration method has the advantages of simple equipment, convenience in operation, low operating cost and medicine cost, high regeneration efficiency, more regenerated times and short regeneration time.

To provide an electrolyte polymer for polymer electrolyte fuel cells, made of a perfluorinated polymer having sulfonic groups, characterized in that in a test of immersing 0.1 g of the polymer in 50 g of a fenton reagent solution containing 3% of an aqueous hydrogen peroxide solution and 200 ppm of bivalent iron ions at 40° C. for 16 hours, the amount of eluted fluorine ions detected in the solution is not more than 0.002% of the total amount of fluorine in the polymer immersed. The electrolyte polymer of the present invention has very few unstable terminal groups and has an excellent durability, and therefore, is suitable as a polymer constituting an electrolyte membrane for polymer electrolyte fuel cells and a polymer contained in a catalyst layer.

The invention belongs to the technical field of treatment for industrial production wastewater, and particularly relates to a method and a device for treating wastewater by an advanced oxidation process, which solve the shortages in the existing methods for treating industrial wastewater. The method comprises the following steps of: performing micro-electrolysis reduction reaction on wastewater; impinging the wastewater with hydrogen peroxide in liquid-liquid reaction equipment; forming Fenton reagent by Fe<2+> and hydrogen peroxide in the wastewater; and performing contact reaction on the wastewater and ozone in the liquid-liquid reaction equipment. The device comprises an impinging stream-rotating packed bed device, wherein nozzles are formed at the outlets of two liquid inlet tubes respectively, the two nozzles are coaxial and the outlets are oppositely arranged, the two liquid inlet tubes are connected with a hydrogen peroxide storage tank and a micro-electrolysis tank respectively, and liquid outlets are connected with the micro-electrolysis tank; and an intake port is connected with an ozone generator, and an exhaust port is connected with a KI adsorption liquid storage tank. The method and the device disclosed by the invention have the beneficial effects that the technical process is simple, the operation is convenient, and wastes are used for treating wastes, thus furthest reducing the treatment cost.

A sewage treatment method coupled with an organic membrane and electro-Fenton catalytic technology belongs to the technical field of sewage treatment in environmental engineering. The sewage treatment method is characterized in that a conductive polymer modified organic fabric membrane is used as a cathode membrane, while a stainless steel mesh is used as an anode, a Fenton reagent is formed in the vicinity of the membrane under the conditions of appropriate electric field, dissolved oxygen, pH value and ferrous ion concentration, and the reaction liquid is circulated through membrane filtration so that the Fenton reagent is dispersed in the system. For the characteristics of sewage, the type and the size of the cathode membrane, the voltage and the like can be optimized. Power generation microorganisms in sewage-treatment microbial fuel cells generate electric power by utilizing sewage, oxygen is reduced by using electrons transmitted from the anode while the organical membrane serves as the cathode; and hydrogen peroxide is formed to arouse Fenton reaction so as to degrade pollutants. The sewage treatment method provided by the invention has the following advantages that organic membrane separation is combined with the electro-Fenton catalytic technology, the pollution and the load of the membrane assembly are reduced, effective contact and reaction of the pollutants and the membrane electrode are enhanced by membrane filtration; and furthermore, through membrane filtration, large-particle pollutants difficult to degrade can be removed.

The invention relates to an adsorption oxidation method for treating high-concentration acrylonitrile wastewater, which comprises the following steps of: adding aqueous solution of a flocculating agent into the acrylonitrile wastewater, stirring, and standing until flocs are settled at the bottom of a container for later use; making the wastewater pass through a microfiltration membrane or an ultrafiltration membrane to remove suspended particles, the flocs and acrylonitrile oligomer from the wastewater, regulating the pH value of the wastewater, adding activated carbon and a Fenton reagent, and stirring for adsorption oxidation; filtering the wastewater by using activated carbon filter cloth, adding the activated carbon and hydrogen peroxide into the wastewater, and stirring for secondary adsorption oxidation; and filtering the wastewater by using the activated carbon filter cloth, and neutralizing filtrate by using sodium hydroxide until the filtrate is neutral. The method improves treatment efficiency, is not limited by the chemical oxygen demand (COD) of the wastewater, avoids secondary pollution, is low in energy consumption, easy and convenient to operate and small in occupied area, and has the characteristics that the method is high-efficiency, economic and environment-friendly.

The invention is named as 'a joint-conditioning dehydration method for sludge', belonging to the technical field of environmental engineering and sludge treatment. The joint-conditioning dehydration method comprises the following steps of: adding H202 and FeSO4 into the sludge (with pH being equal to 5) acidified by mineral acid, degrading organic matter by virtue of strong oxidation of a Fenton reagent, and dissolving and cracking microbial cells and extracellular polymeric substances in the sludge; adding a surfactant CTMAB (Cetyl Trimethyl Ammonium Bromide) into the sludge to reduce the surface tension of the sludge and change the surface characteristics of the sludge, and transforming a part of interstitial water into free water; and flocculating sludge particulates with disperse structure, small particle diameter and large specific surface area by virtue of flocculation action of polyacrylamide (CPAM) to the sludge particulates. After the sludge is subjected to joint conditioning of the Fenton reagent, the surfactant and the CPAM, the moisture content of the sludge after being centrifugally dewatered is reduced to 78.2% from 87.7%, and the output of mud cakes is reduced to 0.115t/m<3> from 0.218t/m<3>, therefore, the dehydration property of the sludge can be improved remarkably, the investment and operation costs are reduced effectively, and an ideal sludge reduction goal is reached.

The invention discloses a purifying device and method for spraying industry VOCs exhaust gas; the purifying device comprises the following processing systems: a static pressure filtration device, a spray scrubber, a demister, a photocatalytic purification tower, multiple groups of activated carbon adsorption tanks, a regeneration fan and a draught fan chimney which are connected successively; the static pressure filtration device is internally provided with a coarse-effect filter; the spray scrubber is internally provided with a water tank, and a Fenton reagent solution can be added in the water tank; the demister is used for removal of water mist brought out when exhaust gas passes through the spray scrubber; a photocatalytic reaction cavity of the photocatalytic purification tower is internally provided with a nano composite anatase titanium dioxide photocatalyst and an UV light; the multiple groups of activated carbon adsorption tanks are internally provided with coconut shell activated carbon. The purifying device and method have better processing effect on organic exhaust gas generated in spraying industries.

The invention discloses a method for treating wastewater from the preparation of glycine by the chloroacetic acid ammonolysis process, comprising the following steps: throwing waste liquid into a multi-effect falling film vacuum evaporation system, preheating the waste liquid in the multi-effect falling film vacuum evaporation system, heating and evaporating the waste liquid with a multi-effect falling film evaporator, putting the waste liquid in a flashing pot, concentrating the waste liquid until achieving the ammonium chloride concentration of 35-45%, crystallizing the concentrated solution with a crystallizer at normal temperature, drying and packaging the crystalline solid, adjusting the pH value of condensate which is generated by the multi-effect falling film vacuum evaporation system to 10-11 with NaOH, stripping the condensate in a stripping tower, absorbing methanol and ammonia which are generated from stripping with water, adjusting the pH value of primary stripping solution to 2-4 with dilute sulfuric acid, catalyzing and oxidizing the primary stripping solution with Fenton reagent at 30-40 DEG C, adjusting the pH value of the catalyzed and oxidized primary stripping solution to 10-11 with dilute sulfuric acid, throwing the primary stripping solution into the stripping tower, stripping the primary stripping solution for the second time in the stripping tower, absorbing methanol and ammonia which are generated from the primary stripping solution stripping with water, and discharging secondary stripping solution.

The invention discloses a Fenton-assisted three-phase flowing pressure cavitation polishing SiC optimal curved surface method. Firstly, the parts, have no need to be machined, of SiC workpieces are wrapped by insulation materials; then, the SiC workpieces are dipped in a reaction pool with a Fenton reagent; after a period of time for reaction, the workpieces are taken out and fixed in a polishingliquid container by a fixture; a series and parallel connection polishing platform controls poses of a cylindrical polishing tool relative to the workpieces, so that a tiny machining gap is always kept between the polishing tool and the surfaces of the workpieces; the tool and the workpieces are totally dipped in the polishing liquid; a servo motor drives the cylindrical polishing tool to rotate at high speed; an ultrasonic bubble generation mechanism continuously adjusts poses of an amplitude change rod relative to a dynamic pressure area; and along with polishing, an abrasive particle current circulating system circularly conveys abrasive particles in a polishing container. The invention further provides a Fenton-assisted three-phase flowing pressure cavitation polishing SiC optimal curved surface. The method improves the polishing efficiency under the precondition of not generating the surface and subsurface damage.

The invention relates to a kind of treatment method of high concentration organic wastewater. The invention takes anaerobic organism filter tank- Fenton reagent oxidization - contact oxidization method (A-F-O method) as the core. After adjusting PH of high concentration organic wastewater, it runs through bottom of anaerobic organism filter tank (AF), and then overflows into Fenton reagent oxidization reactor from top of AF. After reacting by some time, it runs into neutralization sedimentation tank. When having removed vestigial Fe2+ in the wastewater, it gets into contact oxidization system, then control by regular hour, and last, flux through quadratic sedimentation tank. Treated by this method, COD of high concentration organic wastewater can decline to lower than 80mg/L, so it can achieve national discharge standard. The invention has stable and reliable treating effictiveness, convenient and steerable operation, low running cost, so that it adapts to treat high concentration organic wastewater discharged by petroleum chemical enterprise and other analogous enterprises.

The invention relates to a process for treating bio-refractory waste water by an up-flow multi-phase oxidation column. Fenton reagent and waste water to be treated are pumped into the up-flow multi-phase oxidation column for reacting 0.5-1h by a pump, wherein the molar ratio of H2O2 to Fe<2+> is 5-20:1 in the process of adding Fenton reagent, wherein the mass ratio of the added hydrogen peroxide and the COD in the waste water to be treated is 2-3:1. The waste water processed in the oxidation column enters a neutralization tank, a degassing tank and a coagulating precipitation tank in sequence, the pH value of the waste water is adjusted to be neutral in the neutralization tank, the waste water is blasted and degassed for 10-20 min in the degassing tank to degas small oxygen bubbles generated in the process of reacting, and is coagulated and precipitated by adding polyacrylamide in the coagulating precipitation tank to obtain supernatant fluid which reaches the discharge standard and is discharged. Experiments prove that the removal rates of the COD and the colority are both larger than 70 percent. The process has simple operation, easy obtaining of reactants, cheapness, no complex equipment, short treating time and high contamination removing rate.

The invention discloses a process for treating epoxy resin production wastewater. The process comprises: removing oils, suspended particle organic matters, a part of high polymers and toluene in high-salinity wastewater through a cavitation air flotation system, transforming macromolecular organic matters in the wastewater into micromolecular organic matters through an iron-carbon micro-electrolysis reactor, then, oxidizing non-biodegradable and non-chemical oxidable organic matters in the wastewater through a catalytic oxidation reactor under the action of an Fenton reagent, carrying out anaerobic biochemical treatment to reduce the chemical oxygen demand and the biochemical oxygen demand in the wastewater, carrying out aerobic biochemical treatment to anaerobically degrade a part of aerobic organic matters incapable of being degraded by aerobiont into biochemically degradable organic matters, finally, conveying the wastewater into a clean-water reservoir, filtering the wastewater through a multi-medium filter, and discharging the wastewater after meeting the standard. The process disclosed by the invention has the advantages of small energy consumption, high removal load and capability of recycling biogas as an energy source, and the purified water quality meets the emission standard so as to protect the ecological environment.