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Bioflocculation of the oceanic microalga Dunaliella salina by the bloom-forming dinoflagellate Heterocapsa circularisquama, and its effect on biodiesel properties of the biomass

Author:
Cho, Kichul, Hur, Sung-Pyo, Lee, Chi-Heon, Ko, Kyungjun, Lee, Yeon-Ji, Kim, Kil-Nam, Kim, Moo-Sang, Chung, Young-Ho, Kim, Daekyung, Oda, Tatsuya
Source:
Bioresource technology 2016 v.202 pp. 257-261
ISSN:
0960-8524
Subject:
Chlorella vulgaris, Dunaliella salina, Miozoa, Nannochloropsis, biodiesel, biomass, centrifugation, energy content, fatty acid methyl esters, flocculation, fluorescence, harvesting, iodine value, lipid content, microalgae
Abstract:
The aim of this work was to evaluate the flocculation by the dinoflagellate Heterocapsa circularisquama as a means for harvesting three Chlorophyta species, Chlorella vulgaris, Nannochloropsis granulata, and Dunaliella salina. Relative fluorescence of D. salina culture significantly decreased along with 9.3-fold increased flocculation activity within 24h when mixed with H. circularisquama. Lipid content of bioflocculated D. salina increased about 40%, while fatty acid methyl ester (FAME) profiles exhibited higher levels of C16:0, C18:0, and C18:1, compared to harvest by centrifugation, suggesting higher energy content. Furthermore, bioflocculated D. salina biomass had more suitable biodiesel properties relative to both EN14214 and ASTMD6751, with a cetane number of 49.0 and an iodine value of 95.9. These results suggest that H. circularisquama-induced bioflocculation is applicable for the sustainable and qualitative production of algal biodiesel.
Agid:
5266945