Two algal species Chlorella vulgaris and Anabaena vasriabilis were chosen as typical energy microalgae to investigate the surface characteristics of microaglae. The surface potential and hydrophobicity was examined based on the extend XDLVO theory. According to the Zeta potential, hexadecyl trimethyl ammonium bromide (C16TAB) was used as cationic surfactant for flotation. The results showed that both two strains carried with negative charge, and free energy of cohesion for C. vulgaris was 1.21 mJ/m2, and ?55.85 mJ/m2 for A. varsriabilis, which meant hydrophilicity and hydrophobicity respectively. A. varsriabilis performed better harvesting rate than C. vulgaris. The maximums concentration factor (12.45 for C. vulgaris and 1.3 for A. varsriabilis) toped at the pH which charged most negatively (pH=7 for C. vulgaris and pH=9 for A. varsriabilis). Nevertheless, harvesting rate toped at pH=10, which meant it could not reach the maximum with the concentration factor in the same condition, may owing to the drainage of the tonoplast. Meanwhile, after adding 80 mg/L C16TAB into the algal solution, the hydrophobicity rate for C. vulgaris raised from 19% to 64%, and the harvesting rate increased by 67.38%.
Zhou SHEN Hao WEN Xiangying REN Jun LIU Liwei YANG Yanpeng LI
. Influences of Surface Characteristics of Energy Microalgae on Its Harvesting Performance by Air Flotation[J]. The Chinese Journal of Process Engineering, 2018
, 18(2)
: 441
-446
.
DOI: 10.12034/j.issn.1009-606X.217271
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