Enzymatic hydrolysis of paper sludge (PS) and ethanol production. (A) Monosaccharide composition of PS hydrolysate. (B) Ethanol production using 20 g/l of glucose, mannose and xylose. (C) Time course of monosaccharide and ethanol production from a mixed carbon source of 8.5 g/l glucose and 1.5 g/l mannose. Symbols in (C): closed circles = glucose; open circles = mannose; open triangles = dry cell weight (DCW); closed triangles = ethanol. Error bars in (C) denote 5% error of three repeated experiments.