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Bench-scale production of sewage sludge derived-biodiesel (SSD-BD) and upgrade of its quality

Authors
Choi, Oh KyungPark, Jo YongKim, Jae-KonLee, Jae Woo
Issue Date
10월-2019
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Keywords
Wet-transesterification; Xylene; Wet sewage sludge; Biodiesel; Refining; Fuel quality standard
Citation
RENEWABLE ENERGY, v.141, pp.914 - 921
Indexed
SCIE
SCOPUS
Journal Title
RENEWABLE ENERGY
Volume
141
Start Page
914
End Page
921
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/62605
DOI
10.1016/j.renene.2019.04.030
ISSN
0960-1481
Abstract
Even if sewage sludge gain acceptance as a potential feedstock for biodiesel (BD) production, water content and contaminants in sewage sludge still remain as obstacles for the production and quality of biodiesel, respectively. Crude BD was produced from a feedstock of wet sewage sludge with 85% water content via in-situ wet-transesterification in a bench-scale (10 L) reactor, and then further treated for enhancing the BD quality to a transportation grade through a series of refining processes. The wet-transesterification was optimized in terms of crude BD yield by varying methanol dosage, methanol/co-solvent (xylene) ratio and reaction time. The maximum crude BD yield and the fatty acid methyl ester (FAME) content were 11.05 and 67.41%, respectively, when methanol dosage, methanol/co-solvent and reaction time were 15 mL/g, 0.5 and 12 h, respectively. The refining process consisting of vacuum distillation, degumming and neutralization, which satisfied the BD standards (EN14214) and visually improved color and transparency. Based on GC-FID analysis, the FAME content in the refined BD highly increased by eliminating the residual impurities. Applicability of the refined BD as a transportation fuel was confirmed by comparing the quality of the BD blended with the commercial petroleum-diesel (PD) at 3% (BD3) with the standard specification. (C) 2019 Elsevier Ltd. All rights reserved.
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