원문정보
초록
영어
Recently various kinds of macroalgae, such as Laminaia sp. and Gelidiaceae sp., are newly recognized as a biomass feedstock for the production of biofuels. We have studied on the potential of Laminaria japonica as a feedstock for the production of volatile fatty acids (VFAs)
by anaerobic digestion. VFAs can be transformed into alcohols by chemical hydrogenation. We have tested the effects of various operating conditions including pH, retention time, and nutritional additives. The sludge taken from the acidogenesis reactor of an anaerobic digestion
plant using livestock wastewater was used as the initial mixed inoculum. The optimization was carried out first by batch operations using flasks and then the result was confirmed in a semi-continuous bioreactor system. As a combined result of the optimization work and
adaptation of the microbial flora to seaweed feedstock for 6 months, the VFA yields in the bioreactor was increased from 7.2-11.5% at the beginning to 20.2-21.6%. This result is equivalent to the mixed alcohol yield of 175-189 L/ton-VS (volatile solid), when 90% hydrogenation
yield is assumed. The best yield achieved was 31.3%, which is equivalent to 273 L/ton-VS.