초록
<P><B>Abstract</B></P> <P>Efficient ethanol production from waste paper requires the addition of expensive nutrients. To reduce the production cost of ethanol from waste paper, a study on how to produce ethanol efficiently by adding kitchen waste (potentially as a carbon source, nutrient source, and acidity regulator) to waste paper was performed and a process of successive liquefaction, presaccharification, and simultaneous saccharification and fermentation (L+PSSF) was developed. The individual saccharification performances of waste paper and kitchen waste were not influenced by their mixture. Liquefaction of kitchen waste at 90°C prior to presaccharification and simultaneous saccharification and fermentation (PSSF) was essential for efficient ethanol fermentation. Ethanol at concentrations of 46.6 or 43.6g/l was obtained at the laboratory scale after fermentation for 96h, even without pH adjustment and/or the addition of extra nutrients. Similarly, ethanol at a concentration of 45.5g/l was obtained at the pilot scale after fermentation for 48h. The ethanol concentration of L+PSSF of the mixture of waste paper and kitchen waste was comparable to that of PSSF of waste paper with added nutrients (yeast extract and peptone) and pH adjustment using H<SUB>2</SUB>SO<SUB>4</SUB>, indicating that kitchen waste is not only a carbon source but also an excellent nutrient source and acidity regulator for fermentation of the mixture of waste paper and kitchen waste.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Saccharification of waste paper and kitchen waste was not affected by their mixture. </LI> <LI> Kitchen waste as nutrient source improved production of ethanol from waste paper. </LI> <LI> The mixture of waste paper and kitchen waste for L+PSSF didn’t need to adjust pH. </LI> <LI> Liquefaction at 90°C prior to PSSF was essential for efficient ethanol fermentation. </LI> <LI> L+PSSF at enlarged scale reduced SSF time from 96h to 48h. </LI> </UL> </P>