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Wet air oxidation induced enhanced biodegradability of distillery effluent

Malik, S. N. and Sarat Chandra, T. and Tembhekar, P. D. and Padoley, K. V. and Mudliar, S. L. and Mudliar, S. N. (2014) Wet air oxidation induced enhanced biodegradability of distillery effluent. Journal of Environmental Management, 136. pp. 132-138.

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Abstract

The present study reports the feasibility of Wet Air Oxidation (WAO) as a pretreatment option for enhanced biodegradation of complex distillery effluent. Initially, the distillery effluent was pretreated by WAO at different process conditions (pressure, temperature and time) to facilitate enhancement in the biodegradability index (BI ¼ BOD5: COD ratio). The biodegradability of WAO pretreated effluent was evaluated by subjecting it to aerobic biodegradation and anaerobic followed by aerobic biodegradation. Aerobic biodegradation of pretreated effluent with enhanced biodegradability index (BI ¼ 0.4e0.8) showed enhanced COD reduction of up to 67.7%, whereas the untreated effluent (BI ¼ 0.17) indicated poor COD reduction of only 22.5%. Anaerobic followed by aerobic biodegradation of pretreated effluent has shown up to 87.9% COD reduction, while the untreated effluent has shown only 43.1% COD reduction. Bio-kinetic parameters also confirmed the increased rate of bio-oxidation at enhanced BIs. The results indicate that the WAO pretreatment facilitates enhanced bio-oxidation/bio-degradation of complex effluents like the distillery spent wash.

Item Type: Article
Uncontrolled Keywords: Wet air oxidation Distillery effluent Biodegradability Kinetics Aerobic degradation Anaerobic degradation
Subjects: 500 Natural Sciences and Mathematics > 07 Life Sciences > 01 Biology > 03 Environmental Biology
Divisions: Plant Cell Biotechnology
Depositing User: Food Sci. & Technol. Information Services
Date Deposited: 22 Sep 2016 12:21
Last Modified: 16 Jan 2017 12:45
URI: http://ir.cftri.com/id/eprint/12310

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