IJEP 41(12): 1435-1440 : Vol. 41 Issue. 12 (December 2021)
G.N. Nirmala* and Sandra Jose
Vels Institute of Science, Technology and Advanced Studies, Department of Biotechnology, Pallavaram, Chennai, Tamil Nadu, India
Abstract
Bioremediation using activated sludge have been conducted to estimate the degradability of insecticidal compounds, like permethrin and pyrethrin. In this study, the biological oxygen demand (BOD) and chemical oxygen demand (COD) were determined to correlate the biodegradable nature of the compounds. The sludge and synthetic effluent collected was analysed for the biochemical characteristics. The average COD and biodegradability index (BI) of the investigated pyrethrin sample indicated that the compound was fairly biodegradable while permethrin was relatively non-biodegradable. On reaching a bacterial concentration of 5500 µg/mL, 86% and 98% of BOD and COD reduction was achieved for pyrethrin but less than 2% of BOD reduction was observed for permethrin. Assessment of BI value periodically and comparing it to the average value for a compound can aid in monitoring the presence of toxic and non-biodegradable substance.
Keywords
Bioremediation, Permethrin, Pyrethrin, Biological oxygen demand, Chemical oxygen demand, Bacterial concentration, Synthetic effluent, bacterial concentration, toxicity
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