Journal
WASTE MANAGEMENT
Volume 32, Issue 3, Pages 542-549Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2011.10.007
Keywords
Anaerobic digestion; Biogas; Thermal pretreatment; Ultrasound pretreatment; Waste activated sludge
Categories
Funding
- Trojan Technologies, Inc.
- Natural Science and Engineering Research Council (NSERC), Canada
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To enhance the anaerobic digestion of municipal waste-activated sludge (WAS), ultrasound, thermal, and ultrasound + thermal (combined) pretreatments were conducted using three ultrasound specific energy inputs (1000, 5000, and 10,000 kJ/kg TSS) and three thermal pretreatment temperatures (50, 70 and 90 degrees C). Prior to anaerobic digestion, combined pretreatments significantly improved volatile suspended solid (VSS) reduction by 29-38%. The largest increase in methane production (30%) was observed after 30 min of 90 degrees C pretreatment followed by 10,000 kJ/kg TSS ultrasound pretreatment. Combined pretreatments improved the dimethyl sulfide (DMS) removal efficiency by 42-72% but did not show any further improvement in hydrogen sulfide (H2S) removal when compared with ultrasound and thermal pretreatments alone. Economic analysis showed that combined pretreatments with 1000 kJ/kg TSS specific energy and differing thermal pretreatments (50-90 degrees C) can reduce operating costs by $44-66/ton dry solid when compared to conventional anaerobic digestion without pretreatments. (C) 2011 Elsevier Ltd. All rights reserved.
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