The purpose of the undertaken research work is to degrade the biopolymeric pigments present in the distillery spentwash. This is done by direct electro-oxidation using iridium oxide coated titanium mesh as catalytic anode. The effects of current intensity, dilution, pH and time of electro-oxidation were studied. The combined effects were analyzed using Box-Behnken design for optimization and statistical analysis. The rate constant for first order electrochemical kinetics relating the rate constant and current density for decolorization is proposed as kIr = 0.00109 (Id)
1.7244. The power consumption at different current intensities was found based on chemical oxygen demand reduction. The optimal parameters obtained were current intensity (1.3A), dilution (10%) and electrolysis time of 3 hours for 90% target color removal. The actual color removal at optimal conditions is 88% color removal, which confirms close to statistical analysis. The sequential treatment with polyaluminum chloride coagulant was studied to develop an optimized solution for complete degradation of biopolymers.
Dr. Krishna Prasad R., “Removal of Biopolymer in Distillery Spentwash using Iridium Oxide Coated Titanium Mesh Anode and Polyaluminum Chloride: Optimization and Sequential Studies”, Environmental Engineering and Management Journal, vol. 13, pp. 29–35, 2014.