Study On Degradation Of Typical Organic Compounds By Atomization-Heterogeneous Synergetic Ozonation

Nitrobenzene widely existed in the fuel, explosives, pharmaceutical and other industrial waste water, butyl xanthate was the main flotation reagent of nonferrous metal ore flotation, and the treatment method of thewastewater has casused wide attention. The ozone oxidation using activated carbon can effectively degrade the organic compounds has been a hot issue in recent years. The key problem of the technology application was to improve these organic pollutants degradation effect, and increase the remainder ozone. In this paper the self-made reactor was used to treat wastewater of these organic pollutants, mainly content as follows:The technology of atomization-heterogeneous synergetic ozonation had obvious synergistic effect.This paper researched the atomization conditions and the influence factors of nitrobenzene degradation in this system. The orthogonal experiment was carried on basing on the single factor experiment, the result showed that, the level of influencing factors of the oxidation degradation of phenol by this method was that:the ozone dosage> activated carbon dosage>UV lamp power>pH value. According to the orthogonal experimental results, the optimum reaction conditions were determined and the average removal rate of nitrobenzene was94.94%.This paper researched the effect of the influence of several kinds of inorganic anion and metal ions in the reaction system, the result showed that CO32-and Cl-suppressed the degradation reaction; NO3-could hardly affect the nitrobenzene degradation. The low concentration of Cu2+and Mn2+could enhance the removal rate of nitrobenzene, while high concentration suppressed the reaction..The surface morphology of activated carbon changed greatly before and after reaction. The oxidation of activated carbon increased surface carboxyl and lactone quantity, and reduced the number of phenolic hydroxyl group and basic group. The activated carbon adsorption capation gradually decreased after the reaction. There were traces of hydrogen peroxide in this system. The main intermediate products were nitro phenol, polyphenols, small molecule organic acids and NO3-.The atomization used the residual ozone to further enchance the removal rate of NB. The degradation of nitrobenzene in this process was mainly produced hydrogen peroxide under the synergistic action of UV, activated carbon and ozone. Hydroxyl radicals were generated through hydrogen peroxide and hydroxyl triggering ozone on degradation of nitrobenzene.According to the data analysis, the technology of atomization-heterogeneous synergetic ozonation oxidized nitrobenzene complied with first-order kinetics.The nitrobenzene degradation rate constant exerted the positive correlation with ultraviolet lamp power, GAC dosage and temperature, and negative correlation with the droplet size. The pH value and ozone dosage on nitrobenzene degradation rate constant had an optimal value.The kinetic practical equation could be expressed as follows:C=Coexp (-4.54×10-6Q0.50G0.31W0.11t)This technology was used to oxide butyl xanthate. The degradation technology complied with the first-order kinetics. In certain experimental conditions, several key factors in the degradati-on kinetics of butyl xanthate were analyzed, The pH value and ozone dosage on butyl xanthate degradation rate constant had an optimal value.The butyl xanthate degradation rate constant exerted the positive correlation with ultraviolet lamp power, GAC dosage, and negative correlation with the concentration of alkyl xanthate. It can be drawn that carbonate and sulfate generated at last.Based on the study of mineral processing wastewater, the paper concluded that the removal rate of butyl xanthate and COD were achieved respectively98.3%and70.3%.