Publication: The effect of pre-ozone oxidation on acute toxicity and inert soluble COD fractions of a textile finishing industry wastewater
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Elsevier BV
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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.
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Time Factors, Turkey, Chemical Oxygen Demand, Daphnia magna, ozonation, Acute toxicity removal, Wastewater treatment, Animals, Color, Daphnia, Hydrogen-Ion Concentration, Industrial Waste, Models, Chemical, Oxidation-Reduction, Oxygen/chemistry, *Ozone, *Textile Industry, Time Factors, Turkey, Waste Disposal, Fluid/*methods, Water Purification/instrumentation/*methods, acute toxicity, Waste Disposal, Fluid, Models, Ozonation, water sampling, textile industry, ecotoxicity, oxidation kinetics, Textiles, Istanbul [Turkey], article, Hydrogen-Ion Concentration, Textile Industry, Oxidation-Reduction, Textile industry, Textile finishing industry, oxidation, alkalinity, Color, Industrial Waste, Chemical, waste water management, industrial waste, Water Purification, Ozone, chemical oxygen demand, biodegradability, Oxidation, Effluent Treatment, Preoxidation, Animals, controlled study, wastewater, nonhuman, waste water, Toxicity, Inert soluble COD fractions, toxicity, pollution monitoring, color, Ozonization, Oxygen, ozone, biological monitoring, Daphnia, Models, Chemical, Pre-oxidation, biomonitoring, Chemical oxygen demand, Eurasia, crustacean