Use of chitosan acid solutions to improve separation efficiency for harvesting of the microalga Chlorella vulgaris

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The significance of chitosan as a flocculant for microalgae harvesting is well recognized. However, the effects of solvent in dictating the solubility of chitosan, which in turn, influence the separation efficiency (SE) of microalgae, are not explored yet. In this study, at first, self-flocculation efficiency of Chlorella vulgaris was determined in different growth stages. The highest self-flocculation efficiency was found in stationary phase (22. ±. 2%) and the lowest in exponential phase (0.25. ±. 0.02%). Subsequently, the SE of C. vulgaris (in stationary phase) was measured by using four different chitosan-dissolved acids (0.1. M) as flocculants. Citric acid containing chitosan showed the lowest SE of 5.1. ±. 5% followed by nitric acid (54.5. ±. 5.65%), phosphoric acid (69.3. ±. 2.47%), and hydrochloric 84.5. ±. 3.53%, respectively. The effects of flocculant dose and mixing rate on the SE were identified. The cells showed the maximum SE at 30. mg/L of chitosan and 300. rpm mixing rate. Zeta-potential measurement confirmed that the flocculation was induced by charge neutralization. © 2013 Elsevier B.V.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2013-06
Language
English
Article Type
Article
Keywords

FLOCCULATION; WATER; BIODIESEL

Citation

CHEMICAL ENGINEERING JOURNAL, v.226, pp.238 - 242

ISSN
1385-8947
DOI
10.1016/j.cej.2013.04.062
URI
http://hdl.handle.net/10203/175511
Appears in Collection
CE-Journal Papers(저널논문)
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