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http://dx.doi.org/10.15681/KSWE.2015.31.3.328

Optimization for Microalgae Harvesting Using Mg-Sericite Flocculant  

Choi, Hee-Jeong (Department of Environmental Engineering, Catholic Kwandong University)
Publication Information
Journal of Korean Society on Water Environment / v.31, no.3, 2015 , pp. 328-333 More about this Journal
Abstract
In this study, Mg-Sericite was used as a flocculant to harvest freshwater microalgae, Chlorella. vulgaris. Mg-Sericite separated successfully >95% of the C. vulgaris at the following optimal parameters: Mg/Si mol ratio 1.25 to 1.50, mixing time of 20 min and settling time of 20 min. The harvesting efficiency was pH dependent. The highest harvesting efficiency ($99{\pm}0.3%$) was obtained at Mg/Si mol ratio 1.5 and pH 9 to 11. These results indicated that a biopolymer, Mg-Sericite, can be a promising flocculant due to its high efficiency, low dose requirements, short mixing and settling times. This harvesting method is helpful to lower the production cost of algae for biodiesel.
Keywords
Biomass; Clay; Flocculation; Harvesting; Microalgae; Mg-Sericite;
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