Journal
BIORESOURCE TECHNOLOGY
Volume 216, Issue -, Pages 165-171Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2016.05.078
Keywords
Secondary sludge; Fatty acid methyl esters (FAMEs); In situ transesterification; Biodiesel; Response surface methodology
Funding
- Department of Science and Technology (DST)
- Department of Biotechnology (DBT)
- University Grant Commission (UGC), Government of India
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In the present study, feasibility of biodiesel production from freeze dried sewage sludge was studied and its yield was enhanced by optimization of the in situ transesterification conditions (temperature, catalyst and concentration of sludge solids). Optimized conditions (45 degrees C, 5% catalyst and 0.16 g/mL sludge solids) resulted in a 20.76 +/- 0.04% biodiesel yield. The purity of biodiesel was ascertained by GC-MS, FT-IR and NMR (H-1 and C-13) spectroscopy. The biodiesel profile obtained revealed the predominance of methyl esters of fatty acids such as oleic, palmitic, myristic, stearic, lauric, palmitoleic and linoleic acids indicating potential use of sludge as a biodiesel feedstock. (C) 2016 Elsevier Ltd. All rights reserved.
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