High-Temperature Microwave NaOH Pretreatment of Waste-Activated Sludge for Anaerobic Digestion

초록

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 (20-60 meqNaOH/L) and microwave final temperature (100-170 degrees 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 60 meq/L and 170 degrees C. The highest volatile solids removal efficiency (62.4%) was achieved at 40 meq/L and 170 degrees C. Cumulative biogas production and yield were 2.3-5.7 L/L and 154-393 mL/g added volatile solids, respectively, and both parameters were highest at 20 meq/L and 135 degrees C. (C) 2015 American Society of Civil Engineers.

키워드