The effect of pre-ozone oxidation on acute toxicity and inert soluble COD fractions of a textile finishing industry wastewater

Journal of Hazardous Materials
Hüseyin SelçukS Meriç

Abstract

The present work evaluates pre-ozonation for removal of acute toxicity, color and COD as well as reduction of inert soluble COD fractions in two wastewater samples (S1 and S2) taken from a textile finishing industry, located in Istanbul (Turkey). The wastewater samples were oxidized at original pH of 8.6-8.8 under 18.5-24 mg/L of applied ozone doses. Acute toxicity was monitored using Daphnia magna. The results showed that pre-ozonation improved the biodegradability and reduced the acute toxicity. Acute toxicity in raw wastewaters was reduced by 80-90% using 129-200 mg/L transferred ozone (TrO(3)) concentrations. At this point, 86-96% of color, 33-39% of soluble COD and 57-64% of total COD were removed from wastewaters. Both color and COD parameters were found related to the acute toxicity of the wastewater. Pre-ozonation decreased the inert soluble COD fraction (S(I)) of raw wastewater while soluble product formation (S(P)) increased slightly (5-10 mg/L). However, residual COD (the sum of S(I) and S(P)) remained below discharge limit.

References

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Oct 24, 2003·Journal of Hazardous Materials·Roberto AndreozziAnita Radovnikovic

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Citations

Dec 31, 2011·Environmental Science and Pollution Research International·S KarthikeyanG Sekaran
May 16, 2009·Journal of Hazardous Materials·Alessandra C SilvaMarcia Dezotti
Jan 29, 2017·Environmental Pollution·Reza Davarnejad, Samaneh Nasiri

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