Assessing solid digestate from anaerobic digestion as feedstock for ethanol production

作者：Teater Charles; Yue Zhengbo; MacLellan James; Liu Yan; Liao Wei^*

来源：Bioresource Technology, 2011, 102(2): 1856-1862.

DOI：10.1016/j.biortech.2010.09.099

• Anaerobic digestion
• Cattle manure
• Ethanol
• Lignocellulose
• Pretreatment

Ethanol production using solid digestate (AD fiber) from a completely stirred tank reactor (CSTR) anaerobic digester was assessed comparing to an energy crop of switchgrass, and an agricultural residue of corn stover. A complete random design was fulfilled to optimize the reaction conditions of dilute alkali pretreatment. The most effective dilute alkali pretreatment conditions for raw CSTR AD fiber were 2% sodium hydroxide, 130 degrees C, and 3 h. Under these pretreatment conditions, the cellulose concentration of the AD fiber was increased from 34% to 48%. Enzymatic hydrolysis of 10% (dry basis) pretreated AD fiber produced 49.8 g/L glucose, while utilizing 62.6% of the raw cellulose in the AD fiber. The ethanol fermentation on the hydrolysate had an 80.3% ethanol yield. The cellulose utilization efficiencies determined that the CSTR AD fiber was a suitable biorefining feedstock compared to switchgrass and corn stover.

• 出版日期2011-1