Ethanol yield ( Y
) and concentration in simultaneous saccharification and fermentation (SSF) for various paper sludge organic material (PSOM) concentrations. Data are cited from Figures 3-5. Symbols: closed circle = ethanol concentration; open circles = Ye/psom. Open and closed triangles denote Ye/psom and ethanol concentration, respectively, when increased PSOM with 35 FPU/g PSOM was used. Open and closed squares denote Ye/psom and ethanol concentration, respectively, when a 20% inoculum was used. Open and closed rhombuses denote Ye/psom and ethanol concentration of separate hydrolysis and fermentation (SHF), respectively.