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Evaluation of different sludges from WWTP as a potential source for biodiesel production

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10.1016/j.proeng.2012.07.456
 
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hdl:2117/18514

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Olkiewicz, Magdalena
Fortuny Sanromá, AgustínMés informacióMés informacióMés informació
Stüber, Frank Erich
Fabregat Llangostera, AzaelMés informació
Font Capafons, Josep
Bengoa, Christophe José
Document typeArticle
Defense date2012
Rights accessRestricted access - publisher's policy
All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder
Abstract
Biodiesel expansion is currently limited due to high raw material costs for its produc tion. The potential of using sludge from municipal wastewater treatment plants as an alternative lipid feedstock for biodiesel production was investigated. Experiments were conducted to evaluate the suit ability of four different types of wastewater sludges for biodiesel production. Lipids were extracted from primary, secondary, blended and stabilized sludge in a Soxhlet extractor, using hexane as a solvent. Finally, the lipids were converted by acid catalysis transesterification into their corresponding fatty acid methyl esters (FAMEs) - biodiesel . Results indicated that among four sludge tested, primary sludge achieved the greatest lipids and biodiesel yields. Th e amount of extracted lipids for primary sludge was 25.3% compared to 21.9%, 10.1% and 9.1% (dry wt) for blended, stabilized and secondary sludge, respectively. The FAMEs yields obtained in this study were 13.9%, 10.9%, 2.9% and 1% (dry wt) for primary, blended, secondary and stabilized sludge, respectively. The estimation of annual biodiesel production based on the sludge generated in WWTP of Reus was evaluated, showing that primary sludge consists of 87% of the total biodiesel among the wastewater sludges. Gas chromatography analysis of th e FAMEs revealed a similar fatty acids composition for all sludge tested with a predominance of palmitic acid, stearic acid, oleic acid and linoleic acid. Comparison of sludge fatty acid profile with common biodiesel feedstocks showed their suitability for the production of biodiesel.
CitationOlkiewicz, M. [et al.]. Evaluation of different sludges from WWTP as a potential source for biodiesel production. "Procedia engineering", 2012, vol. 42, p. 634-643. 
URIhttp://hdl.handle.net/2117/18514
DOI10.1016/j.proeng.2012.07.456
ISSN1877-7058
Publisher versionhttp://www.sciencedirect.com/science/article/pii/S1877705812028561
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