Application of AOPs for Removal of Stable Cyanide Compounds

[摘要] The main kinetic regularities of the photochemical oxidation of stable cyanide compounds (exemplified by hexacyanoferrates) by combined treatments involving direct photolysis and persulfate (oxidative system UV/S2O82-) and direct photolysis and hydrogen peroxide (oxidative system UV/H2O2) were studied. The possibility to perform oxidation processes within a wide pH range was shown. Based on to the energy efficiency, the rate of reaction and duration of the treatment, the considered oxidative systems can be arranged in the following order: {UV/S2O82-}>{UV/H2O2}>{UV}. The enhanced efficiency of hexacyanoferrates' degradation by the combined system {UV/S2O82-} is due to the high oxidative capacity of sulfate anion radicals SO4-•formed as a result of persulfate photolysis and its further disproportionation by Fe3+and Fe2+released through the decomposition of [Fe(CN)6]3-. Furthermore, the formation of •OH radicals as a result of SO4-•reacting with water also contributes to the enhanced oxidation efficiency. The combined method of {UV/S2O82-} treatment could be applied for the treatment of cyanide-containing wastewater and recycled water of different industries.

[发布机构] Baikal Institute of Nature Management, Siberian Branch, Russian Academy of Sciences, Sakhyanovoy Str. 6, Ulan-Ude; 670047, Russia^1

[学科分类] 土木及结构工程学

[关键词] Combined treatment;Disproportionations;Enhanced efficiency;Kinetic regularities;Oxidation efficiency;Oxidative capacity;Oxidative systems;Photochemical oxidation