Figure 8
Mass balance for cellulase production and ethanol production using 1000 kg of paper sludge (PS). A total of 135 kg and 865 kg of PS were used for cellulase and ethanol production, respectively. Theoretical ethanol yields Ye/hex of 63.4% and the yield from PS organic material (PSOM) Ye/psom of 24% were based for estimation of ethanol production, respectively. Since it is impossible to measure glucose concentration during simultaneous saccharification and fermentation (SSF), Ys was estimated 64% based on experimental data (38.8 g/l of ethanol production) in a 1.2 l reactor, as shown in Table 3.