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

Ashokkumar, Veeramuthu and Salam, Zainal and Tiwari, Onkar Nath and Chinnasamy, Senthil and Mohammed, Sudheer and Ani, Farid Nasir (2015) An integrated approach for biodiesel and bioethanol production from Scenedesmus bijugatus cultivated in a vertical tubular photobioreactor. Energy Conversion And Management, 101 . pp. 778-786. ISSN 0196-8904

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Official URL: http://dx.doi.org/10.1016/j.enconman.2015.06.006

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 (250 L capacity) at semi-continuous mode. During the cultivation period, the volumetric biomass and lipid productivity were assessed. The alga S. bijugatus produced 0.26 g L-1 d-1 of dry biomass and 63 mg L-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 0.21 g/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 0.158 g 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.

Item Type:Article
Uncontrolled Keywords:biodiesel, bioethanol, lipids, scenedesmus bijugatus, tubular photobioreactor
Subjects:A General Works
ID Code:57773
Deposited By: Haliza Zainal
Deposited On:04 Dec 2016 12:07
Last Modified:27 Feb 2017 08:41

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