Abstract
Treatment of textile dyeing wastewaters by conventional methods have recently proved to be inadequate. Such methods consist of various combinations of biological, physical and chemical methods including coagulation/flocculation and carbon adsorption. The study described herein is an investigation of the treatability of a commonly used azo dye in the textile dyeing and finishing operations, Reactive Black 5, by an advanced oxidation process, to achieve an acceptable degree of destruction of the target pollutant. The research was focused on a UV/H2O2 oxidation process, where the individual effects of H2O2 concentration, initial dye concentration, and alkalinity under neutral pH on the pseudo-first order reaction rate constant were investigated. Relative removal rates of color with respect to chemical oxygen demand and total organic carbon in dye-distilled water mixture were compared; effect of bicarbonate alkalinity at neutral pH was tested. Pseudo-first order reaction rate constants and electrical energy requirements per order of magnitude removal were determined.
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