957 results about "Fenton oxidation" patented technology

The electric Fenton oxidation process for processing scale inhibitor in reverse osmosis concentrated liquid adopts anode of iron plate and cathode of porous graphite and ventilated with air pump and processes reverse osmosis concentrated liquid through electrolyzing in stirring, stirring coagulation via adding aluminum sulfate and filtering the coagulated solution. Bivalent iron ion produced intelligent the electric Fenton process is made to react with hydrogen peroxide to produce strong oxidizing free hydroxy radical oxidizing and destructing the scale inhibitor; and the subsequent coagulation separates out scaling salt to lower the scaling trend, so that the concentrated liquid may be utilized as influent water to raise the water recovering rate of reverse osmosis system.

The invention discloses a preparation method of a supported FeOOH catalyst, and an electro-Fenton waste water treatment system. The invention belongs to the technical field of waste water processing. The invention is characterized in that active carbon is utilized as a carrier and ferrous sulphate is utilized as a precursor; through dipping, ethylene diamine tetraacetic acid and ammoniacal undergo an oxidation reduction reaction with active carbon and ferrous sulphate in the presence of oxygen to produce active carbon supported objects and then the active carbon supported objects are washed by deionized water and then are placed in a vacuum oven to be dried at a temperature of 40 to 50 DEG C for 10 to 12 hours to form a supported FeOOH catalyst; active components of the supported FeOOH catalyst comprise alpha-FeOOH and gamma-FeOOH; and under an applied electric field, an out-phase electro-Fenton oxidation system is composed of the supported FeOOH catalyst and hydrogen peroxide and canremove efficiently organic pollutants in waste water. The invention has effects and advantages that an out-phase catalyst can be separated from waste water easily and recycled, and an out-phase electro-Fenton oxidation system can operate in a neutral medium without need of PH adjustment and generation of chemical sludge.

The invention provides a treatment method for recycling complex waste water in the coal chemical industry and relates to recycling technologies for enhanced pretreatment, biochemical treatment, deep purification and regeneration process of waste water. The invention provides the process scheme as follows: first enhanced pretreatment for the complex waste water in the coal chemical industry is carried out by using the combined process of air floatation, Fenton oxidation and ferric-carbon micro-electrolysis, so as to improve the biodegradability of the waste water; then the waste water is poured into a biochemical system comprising a hydrolyze acidification zone pool, an anoxic pool and an aerobic pool; the biodegraded water is discharged into a deep purification system with the function ofozone-biological activated carbon filtration, so that materials which are difficult to degrade are further removed, and the discharged water can be used for green spaces and other landscapes; after that, most of salt ions are removed by using a regeneration recycling system with the functions of multi-media filtration, ultrafiltration and reverse osmosis, so as to obtain water can be reused for production.

The invention relates to improvement on an imidacloprid pesticide wastewater treatment method. The imidacloprid pesticide wastewater treatment method is characterized by comprising the following steps of: performing physical and chemical pretreatment, namely performing chemical phosphorus removal and ferrum-carbon (Fe-C) micro-electrolysis sequentially and then performing Fenton oxidation and catalytic oxidation respectively; and performing biochemical treatment, namely performing aerobic biochemical treatment in the presence of salt-tolerant aerobic bacteria. By the imidacloprid pesticide wastewater treatment method, the total physical and chemical treatment effect is greatly improved; physical and chemical pretreatment can be performed at normal temperature and normal pressure; organic matters difficult to biochemically degrade is degraded and the biochemical property of the wastewater is improved under the condition of low cost; the dilution factor of the wastewater is greatly reduced; and the using amount of diluting water is reduced by 50 to 80 percent, so that the treatment is more economic. The imidacloprid pesticide wastewater treatment method is simple in pretreatment method, mild and stable in process reaction condition, simple in operation (for example, the catalytic oxidation can be performed at normal temperature and normal pressure and a catalyst can be recycled), low in operating cost, good in treatment effect, low in the using amount of the diluting water during the subsequent biochemical treatment and low in total treatment cost, and the water from the biochemical treatment can reach a national level 1 of discharge standard.

The invention discloses a catalytical ozonization catalyst prepared by utilizing multi-source sludge and an application thereof, and establishes a method for preparing a sludge group active carbon catalyst for catalytical ozone oxidation organic industrial waste water. The method comprises the following steps of: utilizing multi-source sludge such as surplus sludge generated by urban sewage factory biochemical treatment and a metal sludge generated by a Fenton oxidation method, preparing a skeleton which is a sludge group active carbon through steps such as organic substance adding, actification, dehydration, drying, mixing, roasting and screening, wherein a surface layer contains a solid catalyst of metallic oxide, and the ratio of the sludge group active carbon and the metallic oxide in parts by weight is 1:(0.3-0.5). The catalyst is used for catalyzing ozone oxidation treatment organic industrial waste water and has higher catalytic activity and stability, the processing range is wide, the realization and popularization and application are easy, and the economic benefits are improved in an organic industrial waste water processing procedure.

The invention discloses a treatment process of waste water polluted by the pesticide of Dursban, and the process includes the procedures of acid eduction, complexation and extraction, Fenton oxidation and catalytic oxidation. The invention is characterized in that Dursban waste water and herbicide Pendimethalin waste water are comprehensively treated, thereby achieving the proposal of waste controlled by the waste, decreasing the load of organic pollutant being hard to be graded in the waste water, improving the biological degradability of the waste water, removing the pollutant from the waste water, and increasing the biochemical performance of the waste water. Besides, the invention has the advantages of safe and advanced technique, clean operation and low waste water treatment cost.

The invention belongs to the technical field of wastewater treatment and in particular relates to an oil and gas field fracturing flow-back fluid centralized treatment process. The oil and gas field fracturing flow-back fluid centralized treatment process comprises the following steps: 1, collecting fracturing flow-back fluid into an adjusting tank, carrying out homogenizing and quantity equalizing treatment on the fracturing flow-back fluid, and enabling the fracturing flow-back fluid to enter a sand settling and oil removal tank to be subjected to sand settling and oil removal; 2, lifting effluent of the adjusting tank into a coagulation/air floatation tank, adding a flocculating agent, and removing floating oil and suspended matters through flocculation and air floatation; 3, enabling effluent of the air floatation tank to enter a primary oxidation unit, adding sodium hypochlorite, and primarily oxidizing and decomposing macromolecular organic compounds; 4, enabling effluent of a primary oxidation tank to enter a Fenton oxidation tower, and deeply oxidizing and decomposing by adopting a Fenton oxidizing agent; 5, enabling effluent of the Fenton oxidation tower to enter a sedimentation tank; and 6, enabling effluent of the sedimentation tank to enter an activated coke filtration and adsorption tank to be subjected to filtration and adsorption treatment, various indexes of effluent of the activated coke filtration and adsorption tank can reach the standard, and the effluent of the activated coke filtration and adsorption tank can be discharged or recycled. The oil and gas field fracturing flow-back fluid centralized treatment process is applicable to treatment of fracturing flow-back fluid in unconventional oil and gas field fracturing mining of petroleum, natural gas, shale gas and coal bed gas.

The invention relates to a method for processing waster water by fenton oxidation, comprising the following steps: (1) enabling alkaline waste water to be processed to enter a flocculation pond so as to be flocculated and precipitated; (2) enabling the flocculated waste water to enter an oxidation pond so as to be oxidized for fenton oxidation reaction; (3) enabling oxidized waste water to enter a precipitation pond so as to be precipitated; (4) adding alkali to supernatant discharged from precipitated waste water to adjust the pH value of the waste water till the waste waster is neutralized, and directly discharging the waste waster or processing the waste water by the next step; and (5) enabling acid precipitate obtained in the step (4) to return to a mixer in a refluxing way to be mixed with total or part of waste water to be processed. With the method for processing waster water through fenton oxidation, the consumption of acid and the alkali can be greatly reduced and content of salt in the waste water can be reduced so that the waste water processing effect is obviously improved.

The invention discloses a treatment for ink sewage, which comprises: adding proper PAC as flocculant in sewage, mixing round quickly, and adding proper ferrous sulfate as coagulant aid; mixing, depositing; using the supernatant for UV/Fenton oxidation under ultraviolet light; before oxidation, using hydrochloric acid to regulate solution pH value to optimal, adding given superoxol and ferrous sulfate; after reaction, adjusting solution to neutrality with superoxol and get rid of iron ion; depositing, and separating out water. The treated water has 97-100% transmittance with total removal rate to COD more than 93% that are between highest limit of second and third class discharge standard (GB 8978-1996).

The invention discloses a processing method of coking steaming ammonia wastewater. The processing method of the coking steaming ammonia wastewater comprises pretreatment of coking steaming ammonia wastewater and biochemical treatment of the coking ammonia wastewater. The pretreatment of the coking steaming ammonia wastewater uses an adjusting pool, an internal electrolysis reactor, a Fenton oxidation pond and a coagulative precipitation tank. A sequencing batch membrane bioreactor technology is adopted by the biochemical treatment, and working procedures of inflow, unused-leaving, reacting and discharging are sequentially performed according to a time period. The processing method of the coking steaming ammonia wastewater can effectively remove persistent organic pollutants and ammonia nitrogen, strengthen effluent quality, and reduce operational and investing costs of equipment.

The invention discloses an advanced oxidative coupling device and process for treating organic wastewater difficult to degrade. A main device body comprises an ozone oxidation-multi-dimensional electro-catalysis/microelectrolysis area, an ozone oxidation-microelectrolysis/Fenton area, a coagulation area and an inclined plate sedimentation area, wherein the ozone oxidation-multi-dimensional electro-catalysis/microelectrolysis area comprises a multi-dimensional electrolysis/microelectrolysis area at the upper part and an ozone oxidation area at the lower part; the ozone oxidation-microelectrolysis/Fenton area comprises a microelectrolysis/Fenton area at the upper part and an ozone oxidation area at the lower part. The device combines four levels of advanced oxidation systems, and electrocatalytic oxidation, ozone oxidation, Fenton oxidation and a microelectrolysis reaction are mutually coupled in function, so that an organic matter difficult to degrade is subjected to multi-level oxidation to realize complete oxidative cracking; when the device is used for treating the organic wastewater difficult to degrade, the yield and the production rate of *OH are increased, the liquid phase transfer process is accelerated, the overall current efficiency of the device is increased, operation expenses are saved, flexible regulation and control of a process unit are realized, and the device can be used for treating various kinds of organic wastewater difficult to degrade.

The invention relates to the technical field of wastewater treatment, and discloses a pharmaceutical wastewater treatment process which comprises steps: preforming wastewater pre-treatment and comprehensive treatment, pumping wastewater into a coagulation gas floatation clarifier, adding polyaluminum chloride and polyacrylamide in a water input pipeline through a coagulation medicine adding system, then enabling mixed wastewater to enter a three-phase catalytic oxidation tower, a coagulative precipitation tank, a pre-acidification pool, a thermoregulation pool, a UASB reaction pool and a combined type hydrolysis acidification pool sequentially, subjecting the mixed wastewater to hydrolysis acidification, enabling the wastewater to enter a primary A/O pool, a primary precipitation pool, a secondary A/O pool, a secondary precipitation pool, a Fenton oxidation pool and a tertiary precipitation pool sequentially, and discharging standard outlet water from a standard discharging opening. The process has the advantages of stable running effect, high ammonium-nitrogen removal rate, and low running cost, thereby being suitable for treatment of wastewater, which is refractory to degrade, in the pharmaceutical industry.

The invention discloses a hydrometallurgy industry raffinate waste water COD removal method. According to the method, lime is added into waste water, and is combined with sulfate radical, phosphate radical, carbonate radical, fluorinions, metal ions and the like to generate defecation mud, the defecation mud is taken as an adsorber to remove dispersed oil in the waste water, filter liquor generated after filtering is subjected to pH regulation, then fenton oxidation is performed to degrade macromolecular organic compounds, further pH regulation is performed, then low molecular weight organic matters are deeply degraded by photo-catalytic oxidation, finally solid-liquid separation is performed to obtain a solid catalyst and waste water with the COD content smaller than 100mg/L, and the solid catalyst is returned to photo-catalytic oxidation reaction for cyclic utilization. The method is good in COD removal effect, free of adsorber regeneration and low in operation cost, and has industry application prospect.

The invention relates to a harmless dimethylacetamide wastewater treatment method which comprises the following steps of: (1) regulating the pH of wastewater in a regulating reservoir; (2) performing pretreatment in an iron carbon-Fenton oxidation pond; (3) performing flocculating sedimentation treatment; (4) adding a carbon source to perform hydrolytic acidification treatment; (5) performing anaerobic biochemical treatment in a primary upflow anaerobic sludge blanket (UASB) reactor; (6) performing anaerobic treatment in a secondary UASB (Upflow Anaerobic Sludge) reactor; (7) treating in an aerobic pond; (8) performing mud-water treatment in a secondary sedimentation tank to drain water. An aerated micro electrolysis method, a Fenton oxidation method and a biological method are combined; moreover, a good wastewater treatment effect is kept, the treatment cost is reduced, and the harmless dimethylacetamide wastewater treatment method has the obvious characteristics of high organic matter removal efficiency, stable effluent quality, low engineering investment, low energy consumption and the like, and is easy to popularize and apply.

Disclosed are printed circuit board high-concentration organic wastewater and an acidic wastewater treating process. The acidic wastewater treating process mainly includes a plurality of steps, namely, acidifying and filter-pressing, iron-carbon micro-electrolysis, Fenton oxidation and flocculent settling, SBR bio-treatment and the like. By the process, organic matters in water can be removed efficiently and thoroughly, and the water is ensured to be capable of reaching the standard and discharged after being mixed with other wastewater through a comprehensive wastewater treating system.

The invention discloses a caffeine production wastewater treatment method, and relates to a wastewater treatment method. The method solves the problem that the content of organic and inorganic substances in effluent produced by the traditional caffeine production wastewater treatment method is high and cannot reach the second-level discharge standards of GB8978-96 'Integrated Wastewater Discharge Standard', and comprises the following steps: 1, adjusting pH of wastewater in a regulating pond; 2, pre-treating the wastewater in an iron-carbon-Fenton oxidation pond; 3, treating the wastewater in a floatation tank; 4, performing anaerobic hydrolysis-acidification treatment on the wastewater in a UASB reactor; 5, treating the wastewater in a biological contact oxidation pond; 6, treating the wastewater in a hydrolyzing multifunctional pond; 7, treating the wastewater in a high-efficiency activated sludge pond; and 8, treating the wastewater in a secondary sedimentation tank to obtain drain water. The whole removing rate of the method is 90 to 98 percent (mass); the pH of the drain water is 7 to 8; COD is 100 to 200 mg/L; ammonia nitrogen is 5 to 25 mg/L; and the color removal rate reaches the national second-level discharge standards.

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 relates to a treatment method of industrial wastewater, in particular to a treatment method of two-step wet acrylic fiber production wastewater. The method comprises the following steps of: a, flocculent settling treatment with a composite flocculating agent for removing compounds of nitrile, amine, cyanogen and the like harmful to organisms, preventing the compounds from adhering and poisoning microbes, removing suspension and colloidal chemical oxygen demand (COD) and lightening the load of a biochemical system; b, aerobic biochemical treatment for degrading organic substancesin the wastewater and removing COD; c, Fenton oxidation deep treatment for oxidizing and decomposing residual organic substances and further removing COD; and d, neutralizing treatment, wherein the produced water after the neutralizing treatment reaches the standards and is discharged or is recycled to the production process. After being treated by the treatment method of the two-step wet acrylicfiber production wastewater, the appearance of the two-step wet acrylic fiber production wastewater is colorless and transparent, the COD removal rate is improved by about 10 to 20 percent compared with a method in the prior art, the COD of the produced water is less than 160mg/L, the treated two-step wet acrylic fiber production wastewater reaches the national grade 1 discharge standard of the acrylic fiber industry, and acrylonitrile and sodium thiocyanate in the produced water are lower than the detection limit.

The invention relates to a coal gasification wastewater processing method. The method comprises the following steps: carrying out coagulation processing and air floatation processing on coal gasification wastewater, sequentially carrying out aerobic biological processing, anaerobic biological processing and the aerobic biological processing by allowing the wastewater to flow through a first aerobic reactor, an anaerobic reactor and a second aerobic reactor, allowing parts of water discharged from the second aerobic reactor to return to the anaerobic reactor, and carrying out normal-temperature normal-pressure catalytic oxidation or carrying out Fenton oxidation and normal-temperature normal-pressure catalytic oxidation on the residual water.

The invention discloses a chemical treatment method, and concretely relates to a purifying method of waste brine in a glyphosate production process. The method comprises the following steps: adjusting the total phosphorus content and TOC and total nitrogen L in the waste brine, adjusting the pH value of the waste brine to 6-10, and carrying out nanofiltration membrane separation to obtain a penetrating fluid; processing the penetrating fluid by adopting a catalytic oxidation technology to obtain a first stage salt solution, wherein the catalytic oxidation is one or a combination of more of a Fenton oxidation processes, a hydrogen peroxide active carbon oxidation process, a sodium hypochlorite active carbon oxidation process, an ozone active carbon oxidation process and a chlorine dioxide oxidation process; and adsorbing by adopting an adsorbent to obtain a second stage salt solution, wherein the adsorbent can be one or a combination of more of macro-porous adsorption resin, chelating resin, molecular sieve, silica gel and activated alumina. The method can effectively solve the problems of difficult treatment, difficult us of waste salt as a byproduct and the like, and has very high economic and social benefits.