Flotation separation of marine microalgae from aqueous medium

Garg, Sourabh, Wang, Liguang and Schenk, Peer M. (2015) Flotation separation of marine microalgae from aqueous medium. Separation and Purification Technology, 156 636-641. doi:10.1016/j.seppur.2015.10.059


Author Garg, Sourabh
Wang, Liguang
Schenk, Peer M.
Title Flotation separation of marine microalgae from aqueous medium
Journal name Separation and Purification Technology   Check publisher's open access policy
ISSN 1383-5866
1873-3794
Publication date 2015-10-27
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.seppur.2015.10.059
Open Access Status DOI
Volume 156
Start page 636
End page 641
Total pages 25
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Language eng
Subject 1602 Analytical Chemistry
1506 Filtration and Separation
Abstract Harvesting of oleaginous marine microalgae by dewatering is an important step for cost-effective algal biomass feedstock production. This paper reports separation of marine microalgae (Tetraselmis sp. M8) from aqueous medium by froth flotation using various collectors (surfactants) with equal carbon chain length, such as dodecyl pyridinium chloride (DPC), N-dodecylpropane-1,3-diamine hydrochloride (DN2), dodecyl amine hydrochloride (DAH), and sodium dodecyl sulphate (SDS), at different pHs. Algal hydrophobicity, froth stability, and surfactant precipitation were characterised. The laboratory-scale mechanical flotation tests showed that at natural pH 9.5 and a lower pH, DPC outperformed DAH, DN2 and SDS in separating Tetraselmis sp. M8 from seawater. DPC was capable of rendering the microalgae hydrophobic, producing metastable froth, and dissolving readily in water, which are all desirable features of a collector for flotation separation of microalgae from water. Use of DPC at 15 ppm in pilot-scale Jameson cell flotation tests for M8 after outdoor cultivation led to a 23-fold increase in algal concentration with over 99% algal recovery. (C) 2015 Elsevier B.V. All rights reserved.
Formatted abstract
Harvesting of oleaginous marine microalgae by dewatering is an important step for cost-effective algal biomass feedstock production. This paper reports separation of marine microalgae (Tetraselmis sp. M8) from aqueous medium by froth flotation using various collectors (surfactants) with equal carbon chain length, such as dodecyl pyridinium chloride (DPC), N-dodecylpropane-1,3-diamine hydrochloride (DN2), dodecyl amine hydrochloride (DAH), and sodium dodecyl sulphate (SDS), at different pHs. Algal hydrophobicity, froth stability, and surfactant precipitation were characterised. The laboratory-scale mechanical flotation tests showed that at natural pH 9.5 and a lower pH, DPC outperformed DAH, DN2 and SDS in separating Tetraselmis sp. M8 from seawater. DPC was capable of rendering the microalgae hydrophobic, producing metastable froth, and dissolving readily in water, which are all desirable features of a collector for flotation separation of microalgae from water. Use of DPC at 15 ppm in pilot-scale Jameson cell flotation tests for M8 after outdoor cultivation led to a 23-fold increase in algal concentration with over 99% algal recovery.
Keyword Marine microalgae
Froth flotation
Hydrophobicity
Ionic Surfactants
Surfactant solubility
Bubble size
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes In Press

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
School of Agriculture and Food Sciences
 
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Created: Mon, 02 Nov 2015, 23:22:51 EST by Dr Liguang Wang on behalf of School of Agriculture and Food Sciences