By a News Reporter-Staff News Editor at Journal of Engineering -- Investigators discuss new findings in Chemical Engineering. According to news reporting from Abbottabad, Pakistan, by VerticalNews journalists, research stated, "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."
The news correspondents obtained a quote from the research from the COMSATS Institute of Information Technology, "In this study, at first, self-flocculation efficiency of Chlorella garis 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."
According to the news reporters, the research concluded: "Zeta-potential measurement confirmed that the flocculation was induced by charge neutralization."
For more information on this research see: Use of chitosan acid solutions to improve separation efficiency for harvesting of the microalga Chlorella vulgaris. Chemical Engineering Journal, 2013;226():238-242. Chemical Engineering Journal can be contacted at: Elsevier Science Sa, PO Box 564, 1001 Lausanne, Switzerland. (Elsevier - www.elsevier.com; Chemical Engineering Journal - www.elsevier.com/wps/product/cws_home/601273)
Our news journalists report that additional information may be obtained by contacting N. Rashid, COMSATS Inst Informat Technol, Dept. of Environm Sci, Abbottabad 22060, Pakistan. Additional authors for this research include M.S.U. Rehman and J.I. Han.
Keywords for this news article include: Asia, Pakistan, Abbottabad, Chemical Engineering
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