Journal
BIORESOURCE TECHNOLOGY
Volume 249, Issue -, Pages 635-643Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.10.073
Keywords
Thermophilic aerobic digestion (TAD); Antibiotic resistance genes (ARGs); Metal resistance genes (MRGs); Class 1 integrons; Sewage sludge
Funding
- Public Technology Development Program - Ministry of Environment, Korea
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This study examines the fate of twenty-three representative antibiotic resistance genes (ARGs) encoding tetracyclines, sulfonamides, quinolones, beta-lactam antibiotics, macrolides, florfenicol and multidrug resistance during thermophilic aerobic digestion (TAD) of sewage sludge. The bacterial community, class 1 integrons (intI1) and four metal resistance genes (MRGs) were also quantified to determine the key drivers of changes in ARGs during TAD. At the end of digestion, significant decreases in the quantities of ARGs, MRGs and intI1 as well as 16S rRNA genes were observed. Partial redundancy analysis (RDA) showed that shifts in temperature were the key factors affecting a decrease in ARGs. Shifts in temperature led to decreased amounts of ARGs by reducing resistome and bacterial diversity, rather than by lowering horizontal transfer potential via intI1 or co-resistance via MRGs.
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