Journal
BIORESOURCE TECHNOLOGY
Volume 179, Issue -, Pages 452-459Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.12.015
Keywords
Food waste; Lipase addition; Hydrolysis; Anaerobic digestion; Biomethane
Funding
- University Doctorial Foundation [20120010110004]
- Beijing Natural Science Foundation [8142030]
- National Twelfth Five-year Research Program of China [2014BAL02B03]
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The lipase obtained from Aspergillums niger was applied to promote the hydrolysis of food waste for achieving high biomethane production. Two strategies of lipase additions were investigated. One (Group A) was to pre-treat food waste to pre-decompose lipid to fatty acids before anaerobic digestion, and another one (Group B) was to add lipase to anaerobic digester directly to degrade lipid inside digester. The lipase was used at the concentrations of 0.1%, 0.5%, and 1.0% (w/v). The results showed that Group A achieved higher biomethane production, TS and VS reductions than those of Group B. At 0.5% lipase concentration, Group A obtained experimental biomethane yield of 500.1 mL/g VSadded, 4.97-26.50% higher than that of Group B. The maximum Bd of 73.8% was also achieved in Group A. Therefore, lipase pre-treatment strategy is recommended. This might provide one of alternatives for efficient biomethane production from food waste and mitigating environmental impact associated. (C) 2014 Elsevier Ltd. All rights reserved.
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