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《Acta Scientiae Circumstantiae》 2008-03
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Effect of solid-state pretreatment with sodium hydroxide on the lignin structure of rice straw

HE Yanfeng,LI Xiujin,FANG Wenjie,KANG Jiali Department of Environmental Science and Engineering,Beijing University of Chemical Technology,Beijing 100029  
The biogas yield of rice straw during anaerobic digestion can be increased through solid-state pretreatment with sodium hydroxide.This study was conducted to investigate the mechanism of biogas yield improvement of the pretreated rice straw.Fourier Transform Infrared Spectroscopy(FTIR),proton Nuclear Magnetic Resonance Spectroscopy(1H-NMR),and Gas Permeation Chromatography(GPC)were used to analyze changes of the lignin structure of pretreated rice straw from different angles.The results showed that the internal structures of the lignin and lignin-carbohydrate complex(LCC)were greatly altered after NaOH pretreatment,resulting in the separation of cellulose from lignin and the decomposition of lignin from large molecules with three-dimensional network structures to small molecules with linear structures.The changes mean the pretreated rice straw is more available to and more easily digested by anaerobic micro-organisms than raw rice straw,leading to the improved biodegradability and the increased biogas yield of the pretreated rice straw.
【Fund】: 国家高技术研究发展计划项目(No.2006AA10Z425)~~
【CateGory Index】: X712
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