碱性条件促进植物生物质厌氧水解及发酵产酸的研究

目的]研究碱性条件对植物生物质厌氧水解和发酵产酸的促进作用。方法]采用半连续流式试验，考察了在pH分别为7．0、8．0、9．0、10．O、11．0和12．0条件下的水生植物生物质（香蒲枯叶）水解、挥发性脂肪酸（Volatile Fatty Acids，VFAs）的积累和分布规律。结果]在pH10．0～12．0的强碱性条件下，VFAs产量随着pH的增大显著增加；生成的VFAs中，乙酸含量大部分在90％以上；强碱性条件使单位质量生物质转化成VFAs的效率显著提高，pH12．0条件下VFAs产率为196．57mg（VFAs）／g（生物质），是pH7．0条件下的2．2倍。结论]生物质的水解效率和溶解性有机物浓度随着强砌陛的增强而显著提高，碱性条件能够有效促进生物质水解及发酵产酸。

Enhancement of Hydrolysis and Volatile Fatty Acids Accumulation from Plant Biomass under Alkaline Conditions

In this study,biomass(cattail litter) fermentation tests were conducted with 6 identical reactors at different pH values ranging from 7.0-12.0.Biomass hydrolysis,volatile fatty acids(VFAs) accumulation,distribution and related stechiometry under alkaline conditions were investigated.The results showed that hydrolysis and soluble organic production were significantly improved with the increase of pH value.Acetic acid was the most prevalent product accounting for over 90% of total VFAs.Under alkaline conditions,not only the production of VFAs was significantly improved,but also the conversion rate of biomass was observably enhanced.The VFAs yield at pH 12.0 was 196.57mgVFAs/g biomass,and it was 2.2 times of those at pH 7.0.In conclusion,biomass hydrolysis and the production of VFAs could be significantly improved under alkaline conditions.