SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2014, Vol. 22 ›› Issue (5): 576-582.DOI: 10.1016/S1004-9541(14)60075-6

• 催化、动力学与反应工程 • 上一篇    下一篇

Enhancing Biogas Production from Anaerobically Digested Wheat Straw Through Ammonia Pretreatment

杨懂艳1,2, 庞云芝1, 袁海荣1, 陈树林3, 马晶伟3, 郁亮3, 李秀金1   

  1. 1 Center for Resources and Environmental Research, Beijing University of Chemical Technology, Beijing 100029, China;
    2 Beijing Municipal Environmental Monitoring Center, Beijing 100044, China;
    3 Department of Biological Systems Engineering, Washington State University at Pullman, WA 99164-6120, USA
  • 收稿日期:2012-08-23 修回日期:2012-09-24 出版日期:2014-05-28 发布日期:2014-05-06
  • 通讯作者: LI Xiujin,E-mail: xjli@mail.buct.edu.cn
  • 基金资助:

    Supported by the National High Technology Research and Development Program of China (2008AA062401) and the China-US International Cooperation Project (2011DFA90800), the Ministry of Science and Technology, China.

Enhancing Biogas Production from Anaerobically Digested Wheat Straw Through Ammonia Pretreatment

YANG Dongyan1,2, PANG Yunzhi1, YUAN Hairong1, CHEN Shulin3, MA Jingwei3, YU Liang3, LI Xiujin1   

  1. 1 Center for Resources and Environmental Research, Beijing University of Chemical Technology, Beijing 100029, China;
    2 Beijing Municipal Environmental Monitoring Center, Beijing 100044, China;
    3 Department of Biological Systems Engineering, Washington State University at Pullman, WA 99164-6120, USA
  • Received:2012-08-23 Revised:2012-09-24 Online:2014-05-28 Published:2014-05-06
  • Supported by:

    Supported by the National High Technology Research and Development Program of China (2008AA062401) and the China-US International Cooperation Project (2011DFA90800), the Ministry of Science and Technology, China.

摘要: Aqueous ammonia was used to pretreat wheat straw to improve biodegradability and provide nitrogen source for enhancing biogas production. Three doses of ammonia (2%, 4%, and 6%, dry matter) and three moisture contents (30%, 60%, and 80%, dry matter) were applied to pretreat wheat straw for 7 days. The pretreated wheat straws were anaerobically digested at three loading rates (50, 65, and 80 g·L-1) to produce biogas. The results indicated that the wheat straw pretreated with 80% moisture content and 4% ammonia achieved the highest methane yield of 199.7 ml·g-1 (based on per unit volatile solids loaded), with shorter digestion time (T80) of 25 days at the loading rate of 65 g·L-1 compared to untreated one. The main chemical compositions of wheat straw were also analyzed. The cellulose and hemicellulose contents were decomposed by 2%-20% and 26%-42%, respectively, while the lignin content was hardly removed, cold-water and hot-water extracts were increased by 4%-44%, and 12%-52%, respectively, for the ammonia-pretreated wheat straws at different moisture contents. The appropriate C/N ratio and decomposition of original chemical compositions into relatively readily biodegradable substances will improve the biodegradability and biogas yield.

关键词: wheat straw, anaerobic digestion, biogas, ammonia pretreatment, moisture content

Abstract: Aqueous ammonia was used to pretreat wheat straw to improve biodegradability and provide nitrogen source for enhancing biogas production. Three doses of ammonia (2%, 4%, and 6%, dry matter) and three moisture contents (30%, 60%, and 80%, dry matter) were applied to pretreat wheat straw for 7 days. The pretreated wheat straws were anaerobically digested at three loading rates (50, 65, and 80 g·L-1) to produce biogas. The results indicated that the wheat straw pretreated with 80% moisture content and 4% ammonia achieved the highest methane yield of 199.7 ml·g-1 (based on per unit volatile solids loaded), with shorter digestion time (T80) of 25 days at the loading rate of 65 g·L-1 compared to untreated one. The main chemical compositions of wheat straw were also analyzed. The cellulose and hemicellulose contents were decomposed by 2%-20% and 26%-42%, respectively, while the lignin content was hardly removed, cold-water and hot-water extracts were increased by 4%-44%, and 12%-52%, respectively, for the ammonia-pretreated wheat straws at different moisture contents. The appropriate C/N ratio and decomposition of original chemical compositions into relatively readily biodegradable substances will improve the biodegradability and biogas yield.

Key words: wheat straw, anaerobic digestion, biogas, ammonia pretreatment, moisture content