O-502 第二世代バイオエタノール生産プロセスにおけるリグニン系発酵阻害物質吸着体およびone-pot SSCFプロセスの開発(糖化発酵,Oral Session5)

概要

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We developed a lignin-derived adsorbent for fermentation inhibitors and one-pot SSCF (Simultaneous Saccharification and Co-fermentation) process using the adsorbent. The adsorbent was made by optimized thermal treatment of the residual lignin obtained by microwave (MW) pretreatment of Eucalyptus globulus wood and subsequent enzymatic hydrolysis or SSCF processes. The soluble fraction separated by the MW pretreatments contained furfural, 5-HMF and lignin degradation products, but the treatments with the adsorbent intensively decreased concentration of the inhibitors without loss of monosaccharide concentration. To establish in situ detoxified SSCF process, the pretreated biomass was hydrolyzed with cellulolytic enzymes in the presence of the lignin-derived adsorbent. It was found that concentration of the inhibitors intensively decreased but the reducing sugar yields was not affected by the presence of the adsorbent. Therefore, one-pot SSCF process with Zymomonas mobilis and the adsorbent was examined, and bioethanol was successfully produced at the ethanol concentration over 5 wt%. The new process produces no wastes and needs no purchase materials. The adsorbent is recyclable and the process relieves load of waste water treatments because the organic compounds in the soluble fraction is removed and converted to energy.
一般社団法人日本エネルギー学会の論文
2014-01-08