Browsing by Author "Solomon, Desta"

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    Removal of Basic Dyes from Textile Wastewater by Applying Advanced Oxidation Process Using Fenton Reagents
    (Addis Ababa University, 2016-05) Solomon, Desta; Worku, Teshome (Ass. professor)
    In this study Advanced oxidation process using Fenton reagents is considered for the application of textile dye-house wastewater treatment. A representative basic dye-house wastewater sample has been brought from K.K. Textile Factory and its characteristic is analyzed and the result shows that dye-house wastewaters, containing basic dyes, are hazardous to the environment since their COD & BOD values are higher than the free discharge limit values and also they are highly colored even at the lower dye concentration operation cases. After characterizing the wastewater, advanced oxidation of a Basic Blue 41 dyes using solar -Fenton treatment was investigated in batch experiments using Box–Behnken statistical experiment design and the response surface analysis. Dyestuff, H2O2 and Fe2+ concentrations were selected as independent variables in Box– Behnken design while color and COD removal were considered as the response functions. Color removal increased with increasing H2O2 and Fe2+ concentrations up to a certain level. High concentrations of H2O2 and Fe2+ adversely affected the color and COD removals due to hydroxyl radical scavenging effects of high oxidant and catalyst concentrations. Both H2O2 and Fe2+ concentration had profound effects on decolorization. Percent color removal was higher than COD removal indicating formation of colorless organic intermediate. The optimal H2O2 / Fe2+ / dyestuff ratio resulting in for the 99.75% color removal & 87.56% COD removal is found to be 1045mg/L / 52mg/L / 12mg/L ( 0, 0, -0.09 coded value). Key Words: advanced oxidation process, Box –Behnken experimental design, Fenton reagents, Percent color removal , percent COD removal