Results
Paper Sludge SSCF at 37-C
Paper sludge SSCF was carried out with S. cerevisiae
RWB222 and Z. mobilis 8b at 378C with an initial
concentration of 170 g/L dry paper sludge (82 g/L glucan,
22 g/L xylan) and an inoculum corresponding to about
10% of the final cell mass produced in a soluble sugar
fermentation with a similar total potential carbohydrate
concentration (data not shown). As may be seen from
Figure 1A, S. cerevisiae produced about 45 g/L ethanol
with no glucose and about 1 g/L xylose left in the medium,
and about 5.5 g/L glucan and 1.2 g/L xylan left in the solid
residual after 120 h (Table I). Z. mobilis 8b performed
somewhat less well at 378C (Fig. 1B), with about 3.3 g/L
glucose and 5.5 g/L xylose present in the medium, and about