期刊
WATER RESEARCH
卷 106, 期 -, 页码 320-329出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2016.10.013
关键词
Anaerobic membrane reactor; Propionic acid; Hydrogen; Thermodynamic; 16S rRNA
资金
- Beijing Municipal Science and Technology Plan Projects [D151100005115001, 2151100001115010]
- National Natural Science Foundation of China [51408599]
- Chinese Universities Scientific Fund [2016QC050]
In this study, sulfate was employed as an external electron acceptor for enhancing the degradation of propionate in a thermophilic anaerobic membrane reactor (AnMBR). The organic loading rate (OLR) was increased gradually from the initial 3.9 kg-COD/m(3)d to the inhibiting OLR of 14.6 kg-COD/m(3)d. Feeding was stopped for 98 days but the process did not recover until 500 mg/L of sulfate was added into the AnMBR. After that, the enhanced propionate degradation was achieved up to an OLR of 15 kg-COD/m(3)d with a reduced sulfate addition of 300 mg/L However, the thermodynamic calculation indicated that the syntrophic propionic acid degradation, coupled with methanogenesis, was unfavorable with a PG of +3 kJ/mot under the enhanced conditions. Conversely, the utilization of propionic acid by sulfate reduction bacterial (SRB) would be more favourable by having a much lower Delta G of -180 kJ/mol. The hydrogen conversion was presumed to go through the methanogenesis pathway according to the thermodynamic results. The mechanism of the propionic and hydrogen metabolism was supported as well by comparing the microbial communities with and without sulfate addition. As a result, the role of the sulfate enhancing propionic degradation can be concluded by combining the process performance, thermodynamic, and microbiology results. (C) 2016 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据