Abstract
Wastewaters from textile industry contain various pollutants including a high content of organic matter, surfactants, additives and dyes. Dyes have obtained notoriety as hazardous substances, because most of them are toxic and considered to be resistant to biodegradation. Recently, advanced oxidation processes (AOP) have received considerable attention because it is possible to degrade organic compounds and color from wastewaters. This study was performed to investigate the removal of COD and color for Reactive yellow 16 using Fenton oxidation. The comparisons of removal efficiencies were made among Fenton, Photo Fenton and Sono Fenton process. Removal of COD and color of 80% & 90%, 90% & 98%, and 82% & 95% can be achieved by Fenton, Photo Fenton and Sono Fenton process. The results showed that H2O2/Fe 2+ /UV process was more effective in COD and color removal.
Highlights
Principles of advanced oxidation processes (AOP)AOPs have common principles in terms of the participation of hydroxyl radicals that are assumed to be operative during the reaction
Chips, silica gel, corncob, barley etc.) have efficiently been used for the purpose of color removal from textile effluents
In order to investigate the effect of Fe2+ concentration on the dye degradation, experiments were conducted at different Fe2+ concentration and at fixed H2O2 concentrations of 900 mg/lit for reactive yellow 16
Summary
AOPs have common principles in terms of the participation of hydroxyl radicals that are assumed to be operative during the reaction. It is claimed that there are other species involved, the active species responsible for the destruction of contaminants in most cases seems to be the hydroxyl radical (OH.) which is unstable and quite reactive. Radical, it must be generated continuously ‘‘in situ’’ through chemical or photochemical reactions described in the literature (Oliver et al, 2000).Hydroxyl radicals produced in either way of described above may attack organic molecules by abstracting a hydrogen atom from the molecule (Clarke and Knowles, 1982). Carey (1990) described a common pathway for the degradation of organics by the hydroxyl radicals as follows: OH.
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