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玉米秸秆干式厌氧发酵乙酸产生规律及其对发酵的影响

陈 斌 杨天学 耿向永 魏自民 席北斗 赵 越 李 雪

陈 斌, 杨天学, 耿向永, 魏自民, 席北斗, 赵 越, 李 雪. 玉米秸秆干式厌氧发酵乙酸产生规律及其对发酵的影响[J]. 环境科学研究, 2015, 28(4): 647-652.
引用本文: 陈 斌, 杨天学, 耿向永, 魏自民, 席北斗, 赵 越, 李 雪. 玉米秸秆干式厌氧发酵乙酸产生规律及其对发酵的影响[J]. 环境科学研究, 2015, 28(4): 647-652.
CHEN Bin, YANG Tianxue, GENG Xiangyong, WEI Zimin, XI Beidou, ZHAO Yue, LI Xue. Effects of Acetic Acid Production on Dry Fermentation Systems with Corn Stalk[J]. Research of Environmental Sciences, 2015, 28(4): 647-652.
Citation: CHEN Bin, YANG Tianxue, GENG Xiangyong, WEI Zimin, XI Beidou, ZHAO Yue, LI Xue. Effects of Acetic Acid Production on Dry Fermentation Systems with Corn Stalk[J]. Research of Environmental Sciences, 2015, 28(4): 647-652.

玉米秸秆干式厌氧发酵乙酸产生规律及其对发酵的影响

基金项目: 国家自然科学基金项目(51178090);国家“十二五”科技支撑计划项目(2012BAJ21B07)

Effects of Acetic Acid Production on Dry Fermentation Systems with Corn Stalk

  • 摘要: 为解决玉米秸秆干式厌氧发酵系统因乙酸积累而致发酵失败、工程运行不稳定等问题,利用气相色谱仪对玉米秸秆干式厌氧发酵过程中w(乙酸)和w(CH4)进行检测,结合相关性分析和回归分析等方法,研究了乙酸动态产生趋势、w(TS)(TS为总固体)与w(乙酸)的相关性,以及w(乙酸)对CH4产生的作用机制. 结果表明:发酵过程中w(乙酸)先增后降,w(TS)由20%增至30%,w(乙酸)增加的持续时间由5 d延至15 d. Pearson相关性分析结果表明,w(TS)与w(乙酸) 呈极显著负相关(R<-0.979,P<0.01). 一元线性回归分析得到拟合方程y=-1 214.8w(TS)+668.2,由斜率(-1 214.8)可知,w(TS)对产乙酸过程具有较明显的抑制作用. 玉米秸秆干式厌氧发酵系统内w(乙酸)为160~451 mg/g,随着w(乙酸)的增加,底物CH4产率经历上升、稳定、下降后再稳定和下降4个阶段,其中w(乙酸)为212~312 mg/g时,底物CH4产率(大于120 m3/t,以秸秆干质量计)最大,其次为w(乙酸)在>312~410 mg/g时的80~120 m3/t.

     

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