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Combined process for ethanol fermentation at high-solids loading and biogas digestion from unwashed steam-exploded corn stover

Author:
Wang, Zhen, Lv, Zhe, Du, Jiliang, Mo, Chunling, Yang, Xiushan, Tian, Shen
Source:
Bioresource technology 2014 v.166 pp. 282-287
ISSN:
0960-8524
Subject:
anaerobic digesters, biogas, biomass, corn stover, ethanol, ethanol fermentation, lignocellulose, methane, steam
Abstract:
A combined process was designed for the co-production of ethanol and methane from unwashed steam-exploded corn stover. A terminal ethanol titer of 69.8g/kg mass weight (72.5%) was achieved when the fed-batch mode was performed at a final solids loading of 35.5% (w/w) dry matter (DM) content. The whole stillage from high-solids ethanol fermentation was directly transferred in a 3-L anaerobic digester. During 52-day single-stage digester operation, the methane productivity was 320mLCH4/g volatile solids (VS) with a maximum VS reduction efficiency of 55.3%. The calculated overall product yield was 197g ethanol+96gmethane/kg corn stover. This indicated that the combined process was able to improve overall content utilization and extract a greater yield of lignocellulosic biomass compared to ethanol fermentation alone.
Agid:
5364701