alexa In Situ Transesterification of Wet Activated Sludge under Subcritical Conditions | OMICS International
ISSN:2157-7463

Journal of Petroleum & Environmental Biotechnology
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Research Article

In Situ Transesterification of Wet Activated Sludge under Subcritical Conditions

Phuong Lan Tran Nguyen1, Alchris Woo Go1, Lien Huong Huynh2 and Yi-Hsu Ju1*
1Department of Chemical Engineering, National Taiwan University of Science and Technology, 43, Keelung Road, Section 4, Taipei 10607, Taiwan
2Department of Chemical Engineering, Can Tho University, 3-2 Street, Can Tho City, Vietnam
Corresponding Author : Yi-Hsu Ju
Department of Chemical Engineering
National Taiwan University of Science and Technology
43, Keelung Road, Section 4, Taipei 10607, Taiwan
Tel: 886-2-2737-6612
E-mail: [email protected]
Received May 24, 2014; Accepted July 22, 2014; Published July 30, 2014
Citation: Nguyen PLT, Go AW, Huynh LH, Ju YH (2014) In Situ Transesterification of Wet Activated Sludge under Subcritical Conditions. J Pet Environ Biotechnol 5:182. doi:10.4172/2157-7463.1000182
Copyright: © 2014 Nguyen PLT, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Commercial production of biodiesel uses refined vegetable as the feedstock with base as the catalyst. However, pure vegetable oil contributes up to 80% of the overall biodiesel production cost. Activated sludge is a rich source of lipid and a potential feedstock for biodiesel production. It was estimated that drying and oil extraction constitutes more than 50% of the cost of biodiesel production from wet activated sludge. In this study, wet activated sludge was directly used as the feedstock to react with methanol under subcritical water condition. At 250°C and a methanol to wet sludge ratio of 3.0 mL/g, a Fatty Acid Methyl Ester (FAME) yield of 33% can be achieved in 4 h. Acetic acid was employed as the catalyst to decrease the amount of methanol to 2.25 mL/g and reaction time to 1 h that were required to reach the same FAME yield (33%). This process can be applied to maximize biodiesel conversion of feedstock with high FFA and moisture contents.

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