Optimal design of microalgae-based biorefinery: Economics, opportunities and challenges

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Microalgae have great potential as a feedstock for the production of a wide range of end-products under the broad concept of biorefinery. In an earlier work, we proposed a superstructure based optimization model to find the optimal processing pathway for the production of biodiesel from microalgal biomass, and identified several challenges with the focus being on utilizing lipids extracted microalgal biomass for economic and environmentally friendly production of useful energy products. In this paper, we expand the previous optimization framework by considering the processing of microalgae residue previously treated as wastes. We develop an expanded biorefinery superstructure model, based on which a mixed integer nonlinear programming (MINLP) model is proposed to determine the optimal/promising biorefinery configurations with different choices of objective functions. The MINLP model is solved in GAMS using a database built in Excel. Economic sensitivity analysis is performed to elaborate the potential improvements in the overall economics, and set the targets that must be achieved in the future in order for microalgal biofuels to become economically viable.
Publisher
ELSEVIER SCI LTD
Issue Date
2015-07
Language
English
Article Type
Article
Keywords

FRESH-WATER MICROALGAE; CHLORELLA-VULGARIS; CARBON SEQUESTRATION; BIODIESEL PRODUCTION; GLOBAL OPTIMIZATION; SUSTAINABLE DESIGN; BIOFUEL PRODUCTION; LIPID EXTRACTION; ALGAL BIODIESEL; LIQUID BIOFUELS

Citation

APPLIED ENERGY, v.150, pp.69 - 79

ISSN
0306-2619
DOI
10.1016/j.apenergy.2015.04.018
URI
http://hdl.handle.net/10203/199994
Appears in Collection
CBE-Journal Papers(저널논문)
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