乔玮^1,2,任征然^1,2,熊林鹏^1,2,董仁杰^1,2,3

• 1:中国农业大学工学院，北京 100083
• 2:国家能源生物燃气高效制备及综合利用技术研发(实验)中心，北京 100083
• 3:中国农业大学烟台研究院，山东 烟台 264670

摘要(Abstract)：

沼气提纯是制备生物天然气的重要过程，实验在玉米秸秆中温连续厌氧发酵反应器中通入外源H₂，考察外源H₂通入量对秸秆产气性能、沼气组分以及发酵稳定性的影响。研究发现，当每天向每升反应器（有效容积）通入1.5 L的H₂时，反应器运行6 d达到稳定，沼气中甲烷体积百分率由54%提纯到93%。由于CO₂的消耗，pH由7.17升高到8.04。此阶段实验组和对照组挥发性固体（VS）去除率分为45%和49%，没有显著性差异（P值为0.40）。乙酸浓度为（170±39）mg·L^-1，丙酸浓度为（8±5）mg·L^-1；对照组乙酸浓度为（45±5）mg·L^-1，其他VFAs均未检测到。通入外源H₂反应器的溶解在液相的氢气（液相氢）为（2.6±1.2）μmol·L^-1，对照组液相氢浓度为（20.7±7.4）μmol·L^-1。通入外源H₂并未对产气和VFA的降解产生严重的抑制作用。综合所研究各项结果，外源H₂可以有效地提纯沼气，对发酵和稳定性没有显著的影响。

关键词(KeyWords)： 秸秆;甲烷发酵;外源H₂;沼气提纯;甲烷

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金（51408599）；北京市科技计划课题（D1611000016003，D1611000016001）；山东省重点研发课题（2016ZDJS11A07）。

作者(Author): 乔玮^1,2,任征然^1,2,熊林鹏^1,2,董仁杰^1,2,3

DOI: 10.3969/j.issn.1003-9015.2019.03.016

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