Biodegradation Kinetics of 2-Chlorophenol With Starch Water As Co-Substrate using Anaerobic Batch Reactor

Abstract

Biological degradation of 2-chlorophenol (2-CP) was investigated in an anaerobic batch reactor using starch water as co-substrate. Experiments were carried out with various mixing ratios of synthetic starch water and 2-CP viz. 90:10, 80:20, 70:30, 60:40, 50:50 and the extent of degradation were quantified. High COD removal efficiency of 97.1% and 97.5% of 2-CP removal was achieved at mixing ratio of 80:20. The bio-kinetic parameters such as maximum specific growth rate (µmax), half velocity constant (Ks) and inhibition constant (Ki) were determined for a mixed anaerobic consortia by both Monod and Haldane models. The growth kinetics represented by Haldane model is found to be very suitable than the Monod model for degrading the combined wastewater of 2-CP and starch The maximum specific growth rate (µmax, h-1), substrate half saturation coefficient (Ks, mg/L) and the substrate inhibitory coefficient (Ki, mg/L) for Haldane model are in the range of 0.00005-0.02, 51.3-774 and 146.6-2272.7 .The correlation coefficient R2 was found to be 0.99 for Haldane model and 0.89 for Monod model.