title: A techno-economic analysis of polyhydroxyalkanoate and hydrogen production from syngas fermentation of gasified biomass.
abstract: A techno-economic analysis was conducted to investigate the feasibility of a gasification-based hybrid biorefinery producing both hydrogen gas and polyhydroxyalkanoates (PHA), biodegradable polymer materials that can be an attractive substitute for conventional petrochemical plastics. The biorefinery considered used switchgrass as a feedstock and converted that raw material through thermochemical methods into syngas, a gaseous mixture composed mainly of hydrogen and carbon monoxide. The syngas was then fermented using Rhodospirillum rubrum, a purple non-sulfur bacterium, to produce PHA and to enrich hydrogen in the syngas. Total daily production of the biorefinery was assumed to be 12 Mg of PHA and 50 Mg of hydrogen gas. Grassroots capital for the biorefinery was estimated to be $55 million, with annual operating costs at $6.7 million. With a market value of $2.00/kg assumed for the hydrogen, the cost of producing PHA was determined to be $1.65/kg.
authors.affiliation: Center for Sustainable Environmental Technologies, Iowa State University, 411 Martson Hall, Ames, IA 50011, USA.
authors.forename: DongWon
authors.initials: D
authors.lastname: Choi
authors.forename: David C
authors.initials: DC
authors.lastname: Chipman
authors.forename: Scott C
authors.initials: SC
authors.lastname: Bents
authors.forename: Robert C
authors.initials: RC
authors.lastname: Brown
mesh_terms: D001674:Bioelectric Energy Sources / Q000191:economics*; D018533:Biomass; D019149:Bioreactors / Q000191:economics; D004867:Equipment Design; D005285:Fermentation; D006859:Hydrogen / Q000737:chemistry*; D054813:Polyhydroxyalkanoates / Q000096:biosynthesis*; D012247:Rhodospirillum rubrum / Q000378:metabolism
chemical_list: D054813:Polyhydroxyalkanoates; D006859:Hydrogen