| 초록 |
There are two major cost factors in this biological process. One is the high downstream processing cost. It is mainly due to the low acetate concentration that develops under the strong inhibition by acetic acid. Traditionally, hydrolyzates of corn starch and corn-steep liquor have been used for glucose/nitrogen sources for this process. The purpose of this investigation is to evaluate cellulosic biomass as an alternative feedstock for this process. Conversion of cellulosic biomass to acetic acid involves two different biological processes, the enzymatic hydrolysis of biomass and the fermentation of glucose to acetate. These two processes can be carried out SHF or SSF. Our primary interest is therefore in the development of the SSF. To our knowledge, this investigation represents the first attempt at that. As such the SSF was first studied using α-cellulose, a standard substrate. This information was then applied to the development of a process using a more practical feedstock, a pulp mill sludge. The scope of work thus covers the basic factors surrounding the SSF process and the assessment of the overall performance. |
