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Many Chinese small electroplating enterprises usually discharge mixed electroplating wastewater which contains CN-, Cr(VI), Cu2+, Zn2+ and other toxic heavy metals. It is hard for efficiently treating this mixed wastewate. At present, conventional chemical methods could usually meet discharge standard, but may not meet recycling need. In this paper, a combined treatment process include O3 oxidation,...
The effect of inorganic ions on Fenton's reagent to degrade phenol in water is studied. Experimental results show that ferric ions can enhance the catalyst-oxidation ability of Fenton's reagent. Phosphate,chloride ions, copper ions and carbonate ions will suppress the catalyst-oxidation ability, and the inhibition ability of ions is: H2PO4->;Cl- >;Cu2+>;HCO3-~CO32-.For the ions of sulfate...
The composite photo catalyst of Fe3+-TiO2-zeolite is prepared in a bench scale, which is immobilized into a zeolite matrix by means of sol-gel technique. The oilfield wastewater in Huabei oilfield was chosen as the model pollutant to evaluate photo catalytic activity under the ultraviolet light and sunlight irradiation respectively, the possible mechanism of photo catalytic oxidation was deduced....
H2O2-based advanced oxidation processes (AOPs) and SO4·--based AOPs were proved novel and promising techniques in treatment of wasterwater. Microwave (MW)-assisted hydrogen peroxide (H2O2), peroxymonosulfate (PMS) and persulfate (PS) were used to dispose of COD in landfill leachate. Oxidant dosage and chloride concentration were investigated as the major operating conditions. The initial COD is 4062...
Photo-Fenton reaction is a kind of advanced oxidation technology based on the reaction of hydroxyl radical. In order to further enhance the photocatalytic efficiency, with citric acid as the catalytic additive, and malachite green as the substrate, experiments on the photocatalytic oxidation of organic pollutants in UV/Fenton/Citric acid system were carried out. Effect of Fe(II) concentration, initial...
Seawater substitution is one of the effective routes to alleviate the shortage of water resources, and its high saline matter can be used in printing and dyeing industry. However, the treatment of the formed dyeing wastewater is difficult for the high salt. This paper using ultraviolet (UV) light to activate persulfate (PS), hydrogen peroxide (H2O2), Oxone (PMS) to degrade azo dye Acid orange 7 (AO7)...
In photochemical reactor, the process conditions of formaldehyde wastewater treatment using UV-Fenton oxidation under the joint action of hydrogen peroxide, ferrous ions, and ultraviolet were studied, and the kinetic curves of formaldehyde degradation in different conditions were obtained. The results showed that: when the original wastewater concentration is 30mg/L, operating temperature is 23 °C,...
The present work deals with the study of uptake behaviour of Cd(II), Pb(II), Hg(II) and Zn(II) ions by chemically synthesized poly(p-Bromoanaline) PPBrAN using batch equilibration technique with both single and binary mixtures. The PPBrAN were chemically synthesized in different HCl concentrations. The effect of the various parameters such as synthesis method, physical oxidation state of the polymer,...
The present work consisted in the study of Titania/Zeolite catalyzed ozonation for nitrobenzene removal. Catalytic activity of the supported TiO2 is strongly influenced by the heat treatment temperature. Titania/Zeolite calcined at 600??C showed the best activity. An approximate increase of 21% in removal rate was achieved for catalytic ozonation compared with single ozonation. Kinetic study of dissolved...
The photodegradation of acetic acid was carried out in the presence of UV/H2O2. The degradation rate was strongly influenced by pH, the intensity of light and initial concentration of acetic acid and H2O2. The effect of anions HCO3-, Cl-, NO3-, SO42- and cations Fe2+, Cu2+, Mn2+ in aqueous solution was also studied . An initial acetic acid concentration of 8 mmol/L was almost completely degraded...
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