Journal of Integrative Agriculture ›› 2017, Vol. 16 ›› Issue (06): 1276-1285.DOI: 10.1016/S2095-3119(15)61108-X

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  • 收稿日期:2015-03-04 出版日期:2017-06-20 发布日期:2017-06-08

In-depth observations of fermentative hydrogen production from liquid swine manure using an anaerobic sequencing batch reactor

Xiao Wu1, Jun Zhu2, Hongjian Lin3   

  1. 1 Southern Research and Outreach Center, University of Minnesota, MN 56093, USA

    2 Biological and Agricultural Engineering Department, University of Arkansas, AR 72701, USA

    3 Department of Bioproducts and Biosystems Engineering, University of Minnesota, MN 55108, USA

  • Received:2015-03-04 Online:2017-06-20 Published:2017-06-08
  • Contact: Jun Zhu, E-mail: junzhu@uark.edu
  • About author:Xiao Wu, E-mail: wuxxx199@umn.edu

Abstract: In this study, experiments were designed to reveal in-depth information of the effect of pH and hydraulic retention time (HRT) on biohydrogen fermentation from liquid swine manure supplemented with glucose using an Anaerobic Sequencing Batch Reactor (ASBR) System.  Five values of HRT (8, 12, 16, 20, and 24 h) were first tested and the best HRT determined was further studied at five pH levels (4.4, 4.7, 5.0, 5.3, and 5.6).  The results showed that for HRT 24 h, there was a dividing H2 content (around 37%) related to the total biogas production rate for the ASBR System running at pH 5.0.  When the H2 content went beyond 37%, an appreciable decline in biogas production rate was observed, implying that there might exist an H2 content limit in the biogas.  For other HRTs (8 through 20 h), an average H2 content of 42% could be achieved.  In the second experiment (HRT 12 h), the highest H2 content (35%) in the biogas was found to be associated with pH 5.0.  The upswing of pH from 5.0 to 5.6 had a significantly more impact on biogas H2 content than the downswing of pH from 5.0 to 4.3.  The results also indicated good linear relationships of biogas and H2 production rates with HRT (r=0.9971 and 0.9967, respectively).  Since the optimal ASBR operating conditions were different for the biogas/H2 production rates and the H2 yield, a compromised combination of the running parameters was determined to be HRT 12 h and pH 5.0 in order to achieve good biogas/H2 productions.  

Key words:  biohydrogen fermentation, swine manure, hydraulic retention time, pH values, anaerobic sequencing batch reactor