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《China Environmental Science》 2008-12
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Impact of acetic acid pretreatment at normal temperature on the anaerobic digestion of lignocelluloses

HE Pin-jing,FANG Wen-juan,LU Fan,ZHU Min,SHAO Li-ming(State Key Laboratory of Pollution Control and Resource Reuse,Key Laboratory of Yangtze River Water Environment,College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China)  
Three kinds of lignocelluloses samples(filter paper,office paper and newspaper) were pretreated with three kinds of acids(10% acetic acid,10% acetic acid with 0.5% nitric acid and 10% acetic acid with 0.5% phosphoric acid) at normal temperature,to investigate the impact of acid pretreatment on the hydrolysis of biochemical components(cellulose,hemicellulose and lignin) separately.The effect of acid pretreatments on the anaerobic digestion of lignocellulose was evaluated with pretreated newspaper.5%±1% of cellulose and 88%±1% of hemicelluloses could be hydrolyzed by acid treatment,but not lignin.Acetic acid pretreatment decreased the hydrophilicity and biodegradability of lignocellulose,causing impact on anaerobic digestion.0.5% nitric acid or 0.5% phosphoric acid added played little significant effect on hydrolysis.However,even at the early stage,when the microbial biomass was less,anaerobic digestion could be also maintained while pretreated with phosphoric acid added.And phosphoric acid could provide the phosphorus element for microbial growth,hence phosphoric acid added was conducive to the startup of anaerobic digestion.Addition of nitric acid could not ease the impact of property changes of lignocelluloses caused by pretreatment.Furthermore,nitric acid caused the accumulation of propionic acids,thereby worsening the effect of anaerobic digestion.
【Fund】: 国家自然科学基金资助项目(50708069);; 国家教育部科学技术研究重点项目(107122);; 上海—法国罗纳阿尔卑斯大区科研合作基金(06SR07105);; 上海市晨光计划(2007CG25)
【CateGory Index】: X705
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