PRETREATMENT OF LIGNOCELLULOSIC MUNICIPAL SOLID-WASTE BY AMMONIA FIBER EXPLOSION (AFEX)

被引:84
作者
HOLTZAPPLE, MT
LUNDEEN, JE
STURGIS, R
LEWIS, JE
DALE, BE
机构
[1] Department of Chemical Engineering, Texas A and M University, College Station, 77843, TX
关键词
MUNICIPAL SOLID WASTE; AMMONIA FIBER EXPLOSION; PRETREATMENT; CELLULASE; ETHANOL;
D O I
10.1007/BF02920530
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The Ammonia Fiber Explosion (AFEX) process treats lignocellulose with high-pressure liquid ammonia and then explosively releases the pressure. The combined chemical effect (cellulose decrystallization) and physical effect (increased accessible surface area) dramatically increase lignocellulose susceptibility to enzymatic attack. For example, bagasse digestibility is increased 5.5 times and that of kenaf core is increased 11 times using extracellular cellulases from Trichoderma reesei. In this study, we applied the AFEX process to mixed municipal solid waste (MSW) and individual components (e.g., softwood newspaper, kenaf newspaper, copy paper, paper towels, cereal boxes, paper bags, corrugated boxes, magazines, and waxed paper). Softwood newspaper proved to be the most difficult component to digest because of its high lignin content. A combination of oxidative lignin cleavage and AFEX was required to increase softwood newspaper digestibility substantially, whereas AFEX alone was able to make kenaf newspaper digestible. Because most MSW components have been substantially delignified in the paper-making process, AFEX only marginally increased their digestibility.
引用
收藏
页码:5 / 21
页数:17
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