Process Design and Economics of On-Site Cellulase Production on Various Carbon Sources in a Softwood-Based Ethanol Plant

<table>Cost contributors of enzyme production in SEK/L ethanol. Molasses was added to chemicals. Other refers to maintenance and insurance. No extra labour was accounted for the enzyme fermentation area. Carbon source A: pretreated liquid fraction, B: pretreated liquid fraction and molasses and C: pretreated liquid fraction and pressed pretreated slurry with a total WIS content of 1%, 2% and 3%; +: 1.5-fold specific activity.</table>

Enzyme Research

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Figure 3

Figure 3: Process Design and Economics of On-Site Cellulase Production on Various Carbon Sources in a Softwood-Based Ethanol Plant 