Conditions for forming ethanol during bioconversion of cellulose-containing raw material |
| |
Authors: | Ziabreva N V Isakova E P Biriukov V V |
| |
Institution: | State Research Institute of Protein Biosynthesis, Moscow, 109004 Russia. |
| |
Abstract: | Several natural associations composed by thermophilic anaerobic bacteria capable of utilizing various cellulose materials at 60 +/- 2 degrees C and pH 6.0-7.0 were isolated from the sludge of Kamchatka geothermal springs. The rate of ethanol production (up to 1.7 g/l per day) and the concentration of ethanol in the medium (up to 1.2%), as well as the fermentation period (10-15 days) were determined under anaerobic conditions in the presence of cellulose, coniferous sawdust, newsprint, or paper pulp as a carbon source. Microorganisms were found that inhibited the production of ethanol. The initial pH value was found to influence both the ethanol production rate and ethanol/acetate ratio. A pH decrease from 7.0 to 5.0 led to 6.7-fold increased the ethanol production and caused a 23.8-fold increase in the ethanol/acetate ratio. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|