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Bioremediation and lipid synthesis through mixotrophic algal consortia in municipal wastewater

Mahapatra, Durga Madhab and Chanakya, HN and Ramachandra, TV (2014) Bioremediation and lipid synthesis through mixotrophic algal consortia in municipal wastewater. In: BIORESOURCE TECHNOLOGY, 168 (SI). pp. 142-150.

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Official URL: http://dx.doi.org/ 10.1016/j.biortech.2014.03.130

Abstract

Algae grown in outdoor reactors (volume: 10 L and depth: 20 cm) were fed directly with filtered and sterilised municipal wastewater. The nutrient removal efficiencies were 86%, 90%, 89%, 70% and 76% for TOC, TN, NH4-N, TP and OP, respectively, and lipid content varied from 18% to 28.5% of dry algal biomass. Biomass productivity of similar to 122 mg/l/d (surface productivity 24.4 g/m(2)/d) and lipid productivity of similar to 32 mg/l/d were recorded. Gas chromatography and mass spectrometry (GC-MS) analyses of the fatty acid methyl esters (FAME) showed a higher content of desirable fatty acids (bearing biofuel properties) with major contributions from saturates such as palmitic acid C16:0; similar to 40%] and stearic acid C18:0; similar to 34%], followed by unsaturates such as oleic acid C18:1(9); similar to 10%] and linoleic acid C18:2(9,12); similar to 5%]. The decomposition of algal biomass and reactor residues with an exothermic heat content of 123.4 J/g provides the scope for further energy derivation. (C) 2014 Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
Keywords: Mixotrophic algal consortia; Lipid; Wastewater treatment; GC-MS; SEM-EDXA
Department/Centre: Division of Biological Sciences > Centre for Ecological Sciences
Division of Interdisciplinary Research > Center for Infrastructure, Sustainable Transportation and Urban Planning (CiSTUP)
Division of Mechanical Sciences > Centre for Sustainable Technologies (formerly ASTRA)
Depositing User: Id for Latest eprints
Date Deposited: 24 Sep 2014 05:48
Last Modified: 24 Sep 2014 05:48
URI: http://eprints.iisc.ac.in/id/eprint/49917

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