期刊
BIORESOURCE TECHNOLOGY
卷 129, 期 -, 页码 296-301出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2012.11.068
关键词
Flocculation; Chitosan; Microalgae; Dewatering; Harvesting
资金
- China Scholarship Council through Ministry of Education, China
- European Union's FP7 SUNBIOPATH Project
- BBSRC [BB/I007660/1] Funding Source: UKRI
- Biotechnology and Biological Sciences Research Council [BB/I007660/1] Funding Source: researchfish
Microalgae are an attractive feedstock for biofuel production, however the harvesting of algal biomass from very large volumes of culture broth represents a major technological and economic challenge. One low cost strategy for addressing this challenge involves the use of flocculation as an initial dewatering step. In this study, flocculation of the green microalga Chlorella sorokiniana was explored in detail using the natural compound, chitosan as flocculant. Results show that clarification efficiency of the process can reach above 99% below pH 7. The optimal chitosan dosage (approximately 10 mg per gram algal dry weight) is determined primarily by cell concentration rather than cell age, lipid content or composition of the medium. Furthermore, the impact of flocculation on the subsequent dewatering process was determined and it was shown to reduce the volume to be processed by 20-50 folds, and significantly reduce energy input and material costs of centrifugation or filtration operations. (C) 2012 Elsevier Ltd. All rights reserved.
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