期刊
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
卷 84, 期 4, 页码 667-676出版社
SPRINGER
DOI: 10.1007/s00253-009-2001-0
关键词
AFEX pretreatment; Biofuel; Cellulosic ethanol; Mass balance; Saccharification; Biorefinery
资金
- Michigan State University Research Foundation
- National Natural Science Foundation of China [20736006]
- National Basic Research Program of China [2007CB714301]
- International Collaboration Project of MOST [2006DFA62400]
- National Science & Technology Pillar Program [2007BAD42B02]
An abundant agricultural residue, rice straw (RS) was pretreated using ammonia fiber expansion (AFEX) process with less than 3% sugar loss. Along with commercial cellulase (SpezymeA (R) CP) at 15 filter paper unit/g of glucan, the addition of MultifectA (R) Xylanase at 2.67 mg protein/g glucan and MultifectA (R) Pectinase at 3.65 mg protein/g glucan was optimized to greatly increase sugar conversion of AFEX-treated RS. During enzymatic hydrolysis even at 6% glucan loading (equivalent to 17.8% solid loading), about 80.6% of glucan and 89.6% of xylan conversions (including monomeric and oligomeric sugars) were achieved. However, oligomeric glucose and xylose accounted for 12.3% of the total glucose and 37.0% of the total xylose, respectively. Comparison among the three ethanologenic strains revealed Saccharomyces cerevisiae 424A(LNH-ST) to be a promising candidate for RS hydrolysate with maximum ethanol metabolic yield of 95.3% and ethanol volumetric productivity of 0.26 g/L/h. The final concentration of ethanol at 37.0 g/L was obtained by S. cerevisiae 424A(LNH-ST) even with low cell density inoculum. A biorefinery combining AFEX pretreatment with S. cerevisiae 424A(LNH-ST) in separate hydrolysis and fermentation could achieve 175.6 g EtOH/kg untreated rice straw at low initial cell density (0.28 g dw/L) without washing pretreated biomass, detoxification, or nutrient supplementation.
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