An integrated approach for biodiesel and bioethanol production from Scenedesmus bijugatus cultivated in a vertical tubular photobioreactor

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논문

An integrated approach for biodiesel and bioethanol production from Scenedesmus bijugatus cultivated in a vertical tubular photobioreactor

학술지

Energy conversion and management

저자명

Ashokkumar, Veeramuthu; Salam, Zainal; Tiwari, O.N.; Chinnasamy, Senthil; Mohammed, Sudheer; Ani, Farid Nasir

초록

Abstract Algae are considered promising renewable feedstocks for the production of alternative fuels. In this study, an indigenous strain of Scenedesmus bijugatus found commonly in the fresh water bodies was isolated and evaluated for biofuels production. The alga was successfully mass cultivated in the custom made vertical tubular photobioreactor (250L capacity) at semi-continuous mode. During the cultivation period, the volumetric biomass and lipid productivity were assessed. The alga S. bijugatus produced 0.26gL−1 d−1 of dry biomass and 63mgL−1 d−1 of lipids, respectively. Algal biomass was harvested by a combined harvesting process involving coagulation and flocculation using Iron (III) sulfate and an organic polymer which resulted in 98% harvesting efficiency. Lipid extraction using hexane:diethyl ether (1:2 ratio) resulted in maximum extraction of lipids. This study also examined sequential stages of esterification and transesterification to convert lipids to biodiesel. The maximum biodiesel yield of 0.21g/g of dry biomass was obtained through the acid base catalytic process. The biodiesel fuel properties were tested and observed that most of the properties complying with ASTM D6751 specifications. The lipid extracted residual biomass recorded a yield of 0.158g of bioethanol per g. This study confirmed the potential of lipid extracted biomass for the production of bioethanol to improve the economic feasibility of microalgal biorefinery. Highlights <UL> <LI> Alga Scenedesmus bijugatus was explored for biodiesel and bioethanol production. </LI> <LI> Tubular photobioreactor was designed and produced 0.26gL−1 d−1 of dry biomass. </LI> <LI> Sequential stages of transesterification produced 0.21g biodiesel yield/g dry biomass. </LI> <LI> The lipid extracted residues of S. bijugatus produced 0.158g bioethanol/g dry biomass. </LI> </UL>

발행연도

2015

발행기관

Elsevier

ISSN

0196-8904

권

101

페이지

pp.778-786

DOI

10.1016/j.enconman.2015.06.006