Microbial pretreatment of biomass |
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Authors: | Fred A Keller Jenny E Hamilton Quang A Nguyen |
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Institution: | (1) National Renewable Energy Laboratory, 1617 Cole Boulevard, 80401 Golden, CO |
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Abstract: | Typical pretreatment requires high-energy (steam and electricity) and corrosion-resistant, high-pressure reactors. A review
of the literature suggests that fungal pretreatment could potentially lower the severity requirements of acid, temperature
and time. These reductions in severity are also expected to result in less biomass degradation and consequently lower inhibitor
concentrations compared to conventional thermochemical pretreatment. Furthermore, potential advantages of fungal pretreatment
of agricultural residues, such as corn stover, are suggested by its effectiveness in improving the cellulose digestibility
of many types of forage fiber and agricultural wastes. Our preliminary tests show a three- to five-fold improvement in enzymatic
cellulose digestibility of corn stover after pretreatment with Cyathus stercoreus; and a ten- to 100-fold reduction in shear force needed to obtain the same shear rate of 3.2 to 7 rev/s, respectively, after
pretreatment with Phanerochaete chrysosporium. |
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Keywords: | Microbial pretreatment fungal pretreatment corn stover enzymatic hydrolysis |
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