Microbial lipid and biodiesel production from municipal sludge fortified with crude glycerol medium using pH-based fed-batch strategy. Issue 1 (February 2021)

• Record Type: Journal Article
• Authors: Kumar, Lalit R.; Yellapu, Sravan K.; Tyagi, R.D.; Drogui, Patrick
• Is Part Of: Journal of environmental chemical engineering. Volume 9:Issue 1(2021)
• Publication Date: 2021-02
• Subjects: pH-based fermentation -- Municipal sludge -- Crude glycerol -- Microbial lipid -- Biodiesel; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2021.105032
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: To achieve a good performance in fed-batch fermentation, the feeding strategy is essential and important. In this study, pH-based (pH 6.0) fed-batch fermentation has been conducted on municipal sludge fortified with crude glycerol medium using Y. lipolytica SKY7 (YL). No additional nitrogen source and trace elements had to be added as secondary municipal sludge had sufficient nitrogen and trace elements to support growth of YL. At 72 h of fed-batch fermentation, high biomass (59.67 g/L) and lipid concentration (31.44 g/L) was obtained. The biodiesel produced using sludge cultivated YL had similar fatty acid ester profile as that of vegetable oil. It was revealed from energy balance that biodiesel production using pH-based fed-batch strategy was energetically favorable and has unit production cost of 0.67 $/L B10. Graphical Abstract: ga1 Highlights: Microbial lipid produced using municipal sludge fortified with crude glycerol. pH-based fed-batch strategy resulted in 0.44 g/L/h lipid productivity. Energy balance for biodiesel production was favorable.