High-Temperature Microwave NaOH Pretreatment of Waste-Activated Sludge for Anaerobic Digestion
Publication: Journal of Environmental Engineering
Volume 141, Issue 8
Abstract
The research reported in this paper determined the effect of combined microwave irradiation and NaOH pretreatment on solubilization and biodegradation in anaerobic digestion of waste-activated sludge (WAS). Solubilization increased significantly with NaOH concentration () and microwave final temperature (100–170°C). However, the experimental trials did not adequately approximate the response surface for volatile solids reduction, cumulative biogas production, and biogas yield. Within the design boundaries, the maximum solubilization degree (72%) of WAS occurred at and 170°C. The highest volatile solids removal efficiency (62.4%) was achieved at and 170°C. Cumulative biogas production and yield were and added volatile solids, respectively, and both parameters were highest at and 135°C.
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Acknowledgments
The research reported in this paper was supported by the Korea Ministry of Environment and Korea Environmental Industry and Technology Institute.
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Published In
Journal of Environmental Engineering
Volume 141 • Issue 8 • August 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Mar 25, 2014
Accepted: Dec 3, 2014
Published online: Jan 21, 2015
Discussion open until: Jun 21, 2015
Published in print: Aug 1, 2015
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