Degradation Characteristics of Non-degradable Dye in Aqueous Solution by Ozonation

Abstract

BACKGROUND: Most of the researches on the dye removal using ozonation have been focused on the removal efficiency. However, the research on their removal characteristics and mechanism according to the reaction time has been still insufficient. METHODS AND RESULTS: In this study, the effects of initial pH and dye concentration with reaction time on the degradation characteristics of methyl orange (MO) and methylene blue (MB) by ozonation were evaluated. The degradation efficiency of MB by ozonation increased with increasing pH. On the other hand, the degradation efficiency of MO by ozonation did not show a significant difference with varing pH. The both MO and MB by ozonation were decomposed within 30 min irrespective of the dye concentration, but the decomposition rates of dyes were faster at lower initial dye concentration. The decomposition

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“…Up to 200,000 tons of textile dye waste from the dyeing process and finishing operations is released to effluents every year . Since the chemical structure of dye molecules is represented by a backbone of the complex aromatic molecular structures that are nonbiodegradable chemicals, they tend to accumulate in an organism and form different aromatic intermediates that are toxic and thus pose a serious threat. , Furthermore, most of them can persist in the environment and are considered to be the main source of pollution to the environment, which directly affect human health and cause ecological damage even at low concentrations. , …”

“…2 Since the chemical structure of dye molecules is represented by a backbone of the complex aromatic molecular structures that are nonbiodegradable chemicals, they tend to accumulate in an organism and form different aromatic intermediates that are toxic and thus pose a serious threat. 3,4 Furthermore, most of them can persist in the environment and are considered to be the main source of pollution to the environment, which directly affect human health and cause ecological damage even at low concentrations. 5,6 Various techniques including adsorption, precipitation, crossflow microfiltration, electrodialysis, and reverse osmosis have been used to actively investigate the removal of dye from the environment.…”