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A previously described techno-economic model (Gregg and Saddler, 1995a,b; Gregg and Saddler, 1996) was used to evaluate the effects of enzyme recycling and hydrolysis time on the production cost of ethanol from either hardwood or softwood substrates. Despite a significant reduction in the enzyme requirement the enzyme cost still represented about 18.5% and 22.7% of the total ethanol production cost...
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