Production of ethanol or other fuel molecules by anaerobic fermentation in fixed-cell reactors of gas produced by lignocellulose gasification
Literature data suggest that ethanol or other fuel molecules can be produced by anaerobic fermentation of synthesis gas obtained by gasification of lignocellulose material. Reactor design studies focussed on study of gas transfer under fluidised bed reactor conditions. Preliminary results were obtained with a pilot-scale fluidised bed reactor specially adapted to gaseous feedstocks and conducted under non-axenic conditions with a massive inoculum of Acetobacterium wieringae. With a CO(2)/H(2) mixture, a gas-feedstock consumption yield of up to 84% was obtained at a space loading rate of 3.1 kg COD per m3 of bioreactor working volume per day. Under higher space loading rates, gas-feedstock transfer rates of up to 8.4 kg COD/m3 of bioreactor working volume per day were obtained. With a CO(2)-H(2)-CO feedstock mixture, a production rate of up to 2.9 kg volatile fatty acids (as COD) per m3 of bioreactor working volume per day was achieved. Carbon monoxide was consumed in preference to carbon dioxide. The feasibility of the new proposed process of carbon monoxide containing syngas fermentation has been proved. The major problems to be solved for the process to become economic have been elicited. These are concerned with the gas transfer rate enhancement and the active biomass retention in the bioreactor.
Bibliographic Reference: EUR 12440 EN (1989) MF, 40 pp., ECU 4, blow-up copy ECU 5
Record Number: 198911169 / Last updated on: 1994-12-01
Original language: en
Available languages: en