954 results about "Fenton reaction" patented technology

The invention relates to a technology for processing high-concentration organic wastewater in a composite electrochemical method, which comprises the main four steps of: pH adjustment, multidimensional electrocatalytic oxidization processing, micro coupling electric fenton reaction oxidation processing and coagulating sedimentation processing. The invention has the technical advantage that the technology has good breaking, chain scission, degradation effects to benzene ring organics, heterocyclic organics, polycyclic organics, macromolecule organics and sustaining organics, which have the most difficulty to degradation. Besides, the technology has no obvious selection to various kinds of high-concentration organic wastewater, has broad-spectrum processing effect, and is an effective measurement for pre-processing to high-concentration organic wastewater having difficulty to degradation. The invention is characterized in that the technology uses second-grade electrochemical processing equipment to realize third-grade advanced oxidation combination processing, effectively utilizes H2O2 and Fe2+ generated by the second-grade electrochemical processing equipment, and makes fenton oxidated and coupled in a micro reactor. During the technological processes, the oxidation capacity is strong to weak, and has reasonable distribution. The pH valve of wastewater does not need repeatedly adjusting. The invention has the obvious characteristics of low electric consumption, little medicine consumption, high processing efficiency, and good controllability.

The invention discloses an efficient wastewater treating process based on Fenton reaction, which comprises the following steps: adjusting the pH value of wastewater to be treated to 3-5; adding H2O2, mixing and stirring; adding FeSO4.7H2O by batch, adjusting the pH value of the wastewater to be treated to 3-5 before adding the FeSO4.7H2O every time, and stirring for 3-10min after adding the FeSO4.7H2O every time; adjusting the pH value of the treated wastewater to 7.5-8; adding flocculating agent, and removing flocculated sediment. The invention quantitatively adds dosage according to the wastewater condition, solves the problem that the treatment effect is influenced because of poor or excessive medicine, improves the use efficiency through adding ferrite by batch, lowers the consumption of the medicine and the sludge quantity, reduces the process procedure of treating residual H2O because of no residual of H2O, controls the hydroxy radical quantity produced immediately by adding H2O in batch, and effectively treats high-COD and difficult-degradation organic wastewater.

The invention relates to a complex heavy-metal waste water emergency quick treatment method, comprising the following steps of: filtering by a sand filter; mixing by a high-speed pump; carrying out an ultraviolet catalyzing ozone reaction; carrying a microwave catalyzing active carbon reaction; carrying micro-electrolytic reaction; circulating waste water; carrying out a Fenton reaction; carryingout electric flocculation on an aluminum electrode plate; and pressing and filtering sludge. Waster water in a circulating slot is pumped into an iron carbon fluidized bed by a fluidizing pump to be circularly treated; an air compressor is connected with the iron carbon fluidized bed and prevents a filler in the iron carbon fluidized bed from blocking; and the microwave active carbon reactor is an active carbon filling tower, and a microwave emitter is arranged outside the body of the active carbon filling tower. The complex heavy-metal waste water emergency quick treatment method disclosed by the invention is used for treating the complex heavy-metal waste water, associated devices are simple, easy, quick, can meet an emergency, and can update and convert, no various chemical raw materials are fed, and various complex heavy-metal waste water with unknown elements can be quickly treated as long as the current magnitude is regulated, and thus the heavy metal in the waste water and chemical oxygen demand can immediately reach the standard and are discharged.

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 method for treating chlorine-containing organic waste water by a heterogeneous phase Fenton-like reaction, which belongs to the technical field of environment protection. The method adopts nanometer FeO, nanometer Fe3O4 or a mixture of nanometer FeO/Fe3O4 as a Fenton-like catalyst, and allows chlorine-containing organic waste water to react in the presence of both the Fenton-like catalyst and H2O2 so as to degrade chloro-substituted organic matter in the waste water. The invention has simple equipment, convenient operations, easily available reagents, can efficiently remove chlorine-containing organic matter in waste water within a wide pH range (Ph 2.0-6.3), and has great application prospects.

The present invention discloses a mesoporous manganese ferrite Fenton-like catalyst and preparation method and application thereof and pertains to the field of preparation of Fenton-like catalysts. The present invention uses KIT-6 as a hard template agent to synthesize mesoporous manganese ferrite catalyst. The prepared mesoporous manganese ferrite and hydrogen peroxide constitute a Fenton-like system oxidation wastewater treatment system to carry out efficient removal and mineralization of organic pollutants in wastewater. The preparation method of the present invention is simple and efficient. The prepared Fenton-like catalyst has a mesoporous structure and a relatively large specific surface area. It can provide more adsorption sites and catalytic site and efficiently degrade pollutants in a wide pH range (acidic, neutral and even alkaline) and solves the problem that conventional Fenton reaction occurs only under an acidic condition and a large amount of iron sludge is generated during reaction, causing secondary pollution. Further, the catalyst can be used cyclically and easily separated from the water solution and recovered after use.

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 discloses a PCB copper-containing wastewater treatment method with autocatalytic oxidation as a core. According to the method, acid copper-containing wastewater is used for regulating pH of alkali copper complex wastewater to be nearly neutral or neutral, zero-valent iron is used for reducing copper ion part in wastewater into new elemental copper which is beneficial for following Fenton reaction, under concerted catalysis action of divalent iron and new elemental copper, high-efficiency Fenton reaction is realized under neutral condition so as to break complex, and then, zero-valent iron is used for reduction to recycle copper ions in wastewater, divalent iron and ferric ions in effluent are removed by an alkali regulation precipitation method, meanwhile, under the effects of flocculation and adsorption of ferric hydroxides, pollutants in water are further removed, copper ion concentration is less than 0.5mg/L and iron ion concentration is less than 10mg/L in final effluent, and biodegradability is good. The method fully uses the copper existing in the system and makes use of catalytic effect of copper while removing the copper, dosage of acid and alkali is remarkably reduced, and salt content of effluent is reduced, and the method has an industrial application value.

The invention discloses a wastewater treatment method based on electro-Fenton reaction, comprising the following steps of: applying a power supply to an electrode containing ferrum in wastewater so that the ferrum of the electrode loses electrons to form ferrous ions, reducing dissolved oxygen in the wastewater on the surface of a stainless steel cathode to generate hydrogen peroxide, and then reacting the hydrogen peroxide with the ferrous ions in the water to generate hydroxyl radicals for oxidizing and degrading organic matters in the wastewater. The invention is characterized in that the wastewater treatment method adopts stainless steel wires as an anode and the cathode for electrochemical reaction, and the power supply applied to the anode and the cathode is a power supply the directions of the anode and the cathode of which can be switched. The invention can reduce by-products of the electrochemical reaction and subsequent wastewater treatment cost and improve reaction efficiency through adopting the stainless steel wires sold in the market as the anode for the electro-Fenton reaction; and meanwhile, due to the adoption of a programmable power supply to switch the directions of the anode and the cathode regularly, the invention effectively prolongs the service life of the electrode and can be widely applied to the treatment of the wastewater with various pH values.

The invention discloses a preparation method of an iron-supported attapulgite heterogeneous fenton catalyst. The method comprises the process steps that A, attapulgite is taken and crushed; B, a right amount of attapulgite is immersed in an acid solution, and uniformly stirred to form a sample; C, the sample is centrifuged; an upper layer suspension is filter and dried; modified attapulgite is obtained; D, the attapulgite is ground and sieved; E, an FeCl3 solution with the concentration of 0.5-2mol/L is adopted; the attapulgite is immersed for 6-24h in a water bath; and F, the attapulgite is centrifuged or filtered, and dried and ground to the original particle size; and a finished product is prepared. The method has the advantages that iron ions are supported to the modified attapulgite through immersion and ion exchange, and the heterogeneous fenton catalyst is prepared, so that nondegradable waste water can be treated efficiently, and the problems that a pH value in homogeneous fenton is low, iron mud can be generated, and secondary pollution is caused are solved. An adsorptive property, an ion exchange property, and a strong oxidizing property of fenton reaction are exerted in waste water treatment.

The invention discloses a combination electrode preparation method and the application of the combination electrode preparation method in a bioelectricity Fenton system, and belongs to the field of environmental engineering and waste water treatment. According to a combination electrode prepared through the combination electrode preparation method, a bioelectrochemistry system serves as a reactor to treat azo dye waste water, anode electro-microorganisms oxidize organic matter so that electrons and protons can be generated, the electrons and the protons are transferred to a cathode chamber through an external circuit and an ion exchange membrane, H2O2 is generated on a cathode in an in-situ mode with O2 as the electron acceptor, a cathode iron source is slowly released, Fenton reaction is performed between iron and H2O2 generated in the in-situ mode, and thus non-biodegradable pollutants are treated.

The invention provides a method for synergistically degrading phenol wastewater through electrocatalytic oxidation and an electric-Fenton technology. The wastewater is introduced into an electrolyzer of which two sides are provided with a water inlet pipe and a water outlet pipe, Ti/TiO2-NTs/Zr-Sb-SnO2 is taken as an anode, foamed nickel coated FeOOH+active carbon powder+polytetrafluoroethylene (PTFE) is taken as a cathode, the anode and the cathode are connected with a voltage-stabilized source, air is provided through aeration or stirring, OH is generated on the surface of the anode, organic matters are degraded through electrocatalytic oxidation action of the anode, oxygen in the solution generates H2O2 on the surface of the cathode, and the H2O2 and the cathode-loaded FeOOH are subjected to heterogeneous Fenton reaction. The method has the advantages of high degradation efficiency, no addition of chemical reagents, no generation of iron mud, and a wide pH value application range, is suitable for treating the phenol wastewater, can be used for treating multiple kinds of organic wastewater and has a wide application prospect in actual application.

The invention relates to a Fe-recycling Fenton oxidation method with zero sludge discharge and a device thereof. The Fenton oxidation method provided by the invention comprises the following steps: treating industrial wastewater by virtue of a Fenton oxidation reactor, adding Fe<2+>, H2O2 and acid during initial operation of the reactor, adding produced iron-containing sludge into a thermocatalytic reduction reaction kettle, adding activated carbon powder, sealing the reaction kettle, heating to 180-200 DEG C, stirring and reacting for 3.0-4.0 h, so as to obtain a solid-liquid two-phase mixture, discharging, adding into a water inlet of the Fenton oxidation reactor, mixing with the industrial water, acid and H2O2, and then entering the reactor and carrying out Fenton reaction, wherein initially and exogenously added Fe<2+> is replaced, and sludge produced during reaction is recycled. The method provided by the invention can realize zero sludge discharge of a Fenton oxidation technology, Fe in the Fenton oxidation reactor is recycled, and great advantage in the aspect of saving reagent expense of the Fenton oxidation technology and sludge treatment cost is shown.

The invention provides a treatment method for complex metal wastewater. The treatment method comprises the following steps of: enabling the complex metal wastewater to flow into an acid regulating tank after carrying out coagulating sedimentation pretreatment so as to regulate pH of the complex metal wastewater to be acidic; introducing the wastewater into a Fenton reaction tank, adding ferrous sulfate and then adding hydrogen peroxide; introducing the reacted wastewater into an alkali regulating tank, adding alkali to regulate the pH of the reacted wastewater to be basic, and introducing the basic wastewater into a sedimentation tank; and introducing liquid supernatant which passes through the sedimentation tank into an ozone active carbon reaction tank, adding active carbon into filtered water, introducing ozone, and enabling reaction outlet water to finally enter a biological reaction tank through the regulating tank to carry out biological treatment. The process can effectively degrade complex formed by zinc, copper, arsenic, nickel, lead, a complexing agent EDTA, citric acid, tartaric acid, ammonium, cyanogens, ethidene diamine and oxalic acid to remove organic complex metal and inorganic complex metals in the complex , and further can recycle part of the heavy metals; and the active carbon which is used as an adsorbent can be recycled, so that the cost of the whole process is reduced.

The invention discloses a method for treating arsenic-containing wastewater by using a multiphase Fenton system based on iron oxide. The method is characterized in that firstly, the pH of the arsenic-containing wastewater is adjusted to range from 2.0 to 9.0, then an iron oxide catalyst and a hydrogen peroxide oxidizing agent are added, so that an organic arsenic compound completes form transformation from organic arsenic to inorganic arsenic in the multiphase Fenton system based on the iron oxide, meanwhile, released inorganic arsenic forms Fe-As chemical coordinate bonds through binding state iron central atoms on the surface of the iron oxide to be effectively adsorbed, and the arsenic pollutant in the arsenic-containing wastewater is removed. Degradation from organic arsenic to inorganic arsenic and adsorption of the inorganic arsenic can be finished simultaneously in one step, the iron oxide serves as an efficient adsorption material of the inorganic arsenic as well as a Fenton reaction catalyst for degrading the organic arsenic to the inorganic arsenic, and the treatment cost of the organic arsenic wastewater is effectively reduced while the reaction efficiency and the operation simplicity are greatly improved.

The invention discloses a nanometer iron oxide/carbon sphere compound catalyst and a preparation method and an application thereof, which belong to the technical field of catalysts. Iron oxide nano particles are uniformly loaded on the surfaces of carbon spheres. The preparation method comprises the following steps of modifying the surfaces of the carbon spheres by performing a Fenton reaction, i.e., under the strong oxidizing property in the coexistence of hydrogen peroxide and ferrous ions; and uniformly loading iron oxide on the surfaces of the carbon spheres to obtain the nanometer iron oxide/carbon sphere compound catalyst. Due to the adoption of the method, the problems of severe aggregation and the like of a nanometer iron oxide catalyst and the like are solved, and the obtained nanometer iron oxide/carbon sphere compound catalyst is taken as an efficient combustion catalyst for solid propellants, a catalyst for photo-degradation organic matters, and a catalyst for petroleum cracking.

The combined effluent treating process includes the first photooxidizing Fenton's reaction with oxidant H2O2 and HClO and reductant Fe ion in the action of light for 0.5-2 hr; the subsequent flocculation with aluminum salt, iron salt, complex salt or other flocculant and polyacrylamide as flocculation assistant; and final microbe degradation. The said combined effluent treating process has powerful synergistic effect and COD eliminating rate as high a 98.9 %.

The invention provides a ferrite/metal oxide material and a preparation method and application thereof. The ferrite/metal oxide material is a composite material of ferrite or ferrite-metal oxide, wherein the ferrite is of a spinel structure, a formula is MFe2O4, the metal oxide is one or more of Fe2O3 and metal M oxides, and M is one or more of Zn, Co, Mn, Cu and Ni. The preparation method comprises the steps that an iron precursor and a metal M precursor are dissolved in an organic solvent, and heating and stirring are performed; an aqueous hydrogen peroxide solution is added, stirring continues to obtain sol, and drying is performed under the condition of 120-150 DEG C; under a nitrogen or air atmosphere, calcination is performed at the temperature of 200-900 DEG C for 4-6 hours to obtain the ferrite/metal oxide material. The obtained product is small in particle size and controllable in composition, the preparation method is simple in process, and the ferrite/metal oxide material has a very good effect when serving as a catalyst to activate PMS and degrade organic pollutants in light-like fenton reaction and has an industrial application prospect.

The invention provides a modified Fenton fluidized bed and a method thereof for treating wastewater. The Fenton fluidized bed comprises an oxidation tower, a sieve plate, a filling material A, a filling material B, a Fenton oxidation zone, an iron-carbon reaction zone, a water entering and distributing zone, a water discharging area, a water discharging groove, a circulating device, indispensable pipe fittings and the like. According to the method for treating the wastewater, which is provided by the invention, the wastewater is treated by adopting the modified Fenton fluidized bed; the wastewater is distributed through an annular perforated pipe and the sieve plate of a bottom layer; a COD (Chemical Oxygen Demand) and organic pollutants which are difficult to degrade in the wastewater are decreased through a Fenton reaction; afterwards, the wastewater enters the iron-carbon reaction zone, and active carbon and zero-valence nano iron in the filling material B generate an iron-carbon micro-electrolysis reaction, so as to further catalytically oxidize the organic pollutants, which are difficult to degrade, in the wastewater. The modified Fenton fluidized bed provided by the invention is optimized, economical and reasonable in structure and high-efficiency in treatment.

The invention discloses a soil restoration method based on oxygen activation of iron powder and polyphosphoric acid molecules. According to the method, by utilizing an environment-friendly low-cost oxidation reaction system formed by polyphosphoric acid, zero-valent iron and air, oxygen is activated by a Fe<2+> ligand generated by oxidizing polyphosphoric acid and the iron powder, so that the H2O2 is generated in situ and forms a Fenton reaction with Fe<2+>; and thus pollutants in the organic polluted soil are degraded. Compared with the traditional Fenton system or the similar Fenton system, polyphosphoric acid is very stable, difficult to degrade, environment-friendly and nontoxic to a human body, so that polyphosphoric acid does not generate secondary pollution as compared with other organic ligands, i.e., polyphosphoric acid is more durable in catalytic degradation effect. In addition, as the method is used, the erecting of a complicated device is not required; the restoration process is easy to operate; and the reaction can be performed by only mixing catalysts. Therefore, the dangerousness is avoided, i.e., the employing of a professional operator to perform the operation is not required.

The invention discloses a treatment method for aniline wastewater. The treatment method comprises the following steps: firstly, adjusting the aniline wastewater to acid; heating to 40-100 DEG C and mixing with a formaldehyde solution, after condensation polymerization, adjusting the pH to 6-9, and filtering to obtain a supernate I; then, adjusting the pH value of the supernate I to 2-6, after Fenton reaction, adjusting the pH value to 7-10 for flocculation, and filtering to obtain a supernate II; and adding a NaClO solution into the supernate II, reacting at 30-50 DEG C for 0.1-2 hours and filtering. The invention provides the treatment method for the aniline wastewater. By combined use of a condensation polymerization-Fenton-NaClO oxidization technology, the COD and aniline content of the aniline wastewater are obviously reduced, the treatment effect is remarkable, no solid wastes are generated, and secondary pollution is not caused.