Performance Optimization of Anaerobic Continuous Stirred-Tank Reactor Operating on Distillery Spent Wash
Publication: Journal of Environmental Engineering
Volume 145, Issue 9
Abstract
In order to better understand the performance, anaerobic treatment of spent wash with very high chemical oxygen demand (COD) () and biochemical oxygen demand (BOD) () was studied on a full-scale continuous stirred-tank reactor (CSTR). Under variable organic loading rates (OLRs), optimum conditions for maximum COD removal and biogas generation were found to be , , and volatile fatty acids (VFA) to alkalinity ratio of around 0.12. Maximum COD removal efficiency was found to be around 71% when operated in the pH range of 7–8 with stable temperature of 37°C–38°C with biogas conversion coefficient of 0.4. These figures are particularly significant when operating the anaerobic biodigesters for treatment of spent wash and to produce biogas as an energy source. An anaerobic CSTR can successfully be employed for the treatment of distillery spent wash, but postmethanation effluent still contains a high COD concentration and needs to be treated further to meet the pollution norms and standards.
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Acknowledgments
We convey our heartfelt gratitude to the Lokmangal Sugar Industry, Solapur, Maharashtra, India, for providing its support and the opportunity to conduct the present study.
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Published In
Journal of Environmental Engineering
Volume 145 • Issue 9 • September 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: May 16, 2018
Accepted: Feb 7, 2019
Published online: Jul 5, 2019
Published in print: Sep 1, 2019
Discussion open until: Dec 5, 2019
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