[Conditions for forming ethanol during bioconversion of cellulose-containing raw material].
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.
Ziabreva
N V
NV
State Research Institute of Protein Biosynthesis, Moscow, 109004 Russia.
Isakova
E P
EP
Biriukov
V V
VV
D001419:Bacteria / Q000378:metabolism; D001673:Biodegradation, Environmental; D002482:Cellulose / Q000378:metabolism*; D000431:Ethanol / Q000378:metabolism*
D000431:Ethanol; D002482:Cellulose
Usloviia obrazovaniia tanola pri biokonversii tselliulozosoderzhashchego syr'ia.