Textile bioreactor a possible solution to reducing ethanol fermentation cost
2016 (English)In: Bioprocess and Bio Therapeutics, 2016Conference paper, Abstract (Refereed)
Sustainable developmentThe content falls within the scope of Sustainable Development
There is growing concern on bioethanol application as a transportation fuel because of the current low price of crude oil. To reduce the ethanol fermentation cost, how ethanol bioreactors can be designed to offer process flexibility, reduced investment cost, optimal productivity and more than 1 h-1 dilution rates without washout was investigated. A bioreactor made with textile as its backbone material of construction was designed to anaerobically utilize flocculating yeast for ethanol production without using mixing devices like aerators, spargers and stirrers. A mixing system was developed that used the flocculating yeast in the form of a fluidized bed in the bioreactor, and the conditions needed to maintain the fluidized bed in the bioreactor were determined. Recirculation flow rate and utilization of the mixing system were used as process variables for fermentation experiments. It was found that it is possible to use the fluidized mixing system in the bioreactor at dilution rate of 1.2 h‑1 without washout. Mass transfer limitations associated with mixing when using flocculating yeast was resolved even at low recirculation mixing rate of 0.0016 VVM. Specific ethanol productivity of 0.29 ± 0.01 g-ethanol/g-biomass/h with complete sucrose consumption was attained. Using the bioreactor with flocculating yeast can reduce the fermentation investment cost of a 100,000 m3/y ethanol plant by 37 %.
Place, publisher, year, edition, pages
Engineering and Technology
IdentifiersURN: urn:nbn:se:hb:diva-11684DOI: 10.4172/2155-9821.C1.009OAI: oai:DiVA.org:hb-11684DiVA: diva2:1062912
4th International Conference on Bioprocess and Bio Therapeutics, Houston, October 20-21, 2016