Abstract
Two advanced oxidation processes, Fenton's reagent oxidation and ozonation, were used for pretreatment of a 4,4′-diaminostilbene-2,2′-disulfonic acid (DSD-acid) manufacturing wastewater on a laboratory scale. The results showed that both methods are suitable for partial removal of chemical oxygen demand (COD) and color as well as the enhancement of biodegradability of DSD-acid manufacturing wastewater before the conventional biological treatment. Fenton's reagent oxidation by 9.0 g/L H 2O 2 and 150 mg/L Fe 2+ and ozonation by 7.5 g/L O 3 led to an improved biodegradability (BOD 5/COD = 0.3). Fenton's reagent oxidation in combination with Fe 3+ coagulation has shown to effectively remove COD and color. About 90% of COD and 95% of color removals were obtained at the optimum condition, oxidation by 150 mg/L Fe 2+ and 2 g/L H 2O 2, followed by two-stage coagulation with 5 g/L and 2 g/L FeCl 3, respectively.
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