Journal
BIORESOURCE TECHNOLOGY
Volume 211, Issue -, Pages 414-421Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2016.03.086
Keywords
Two-phase anaerobic digestion; Antibiotic resistance genes; Bacterial community structure; Bacterial pathogens
Funding
- Natural Science Foundation of China [21277117, 21210008]
- Major Science and Technology Program for Water Pollution Control and Treatment [2014ZX07101-012]
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The response of representative antibiotic resistance genes (ARGs) to lab-scale two-phase (acidogenic/methanogenic phase) anaerobic digestion processes under thermophilic and mesophilic conditions was explored. The associated microbial communities and bacterial pathogens were characterized by 16S rRNA gene sequencing. A two-phase thermophilic digestion reduced the presence of tetA, tetG, tetX, sul1, ermB, dfrA1, dfrA12 and intI1 exhibiting 0.1-0.72 log unit removal; in contrast, tetO, tetW, sul3, ermF and blaTEM even increased relative to the feed, and sul2 showed no significant decrease. The acidogenic phase of thermophilic digestion was primarily responsible for reducing the quantity of these genes, while the subsequent methanogenic phase caused a rebound in their quantity. In contrast, a two-phase mesophilic digestion process did not result in reducing the quantity of all ARGs and intI1 except for ermB and blaTEM. ARGs patterns were correlated with Proteobacteria and Actinobacteria during the two-phase anaerobic digestion. (C) 2016 Elsevier Ltd. All rights reserved.
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