期刊
BIORESOURCE TECHNOLOGY
卷 341, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.125859
关键词
Combined pollution; Stress and post effects; Abundant-rare genera; Antibiotic resistance genes; Interactions of sludge microbiome
资金
- National Natural Science Foundation of China [51808013]
- National Key Research and Development Program of China [2018YFC0704800]
This study investigated the short-term response of abundant-rare genera and antibiotic resistance genes to azithromycin and copper combined pollution in activated sludge nitrification system at low temperature. It was found that ammonia-oxidizing archaea increased in relative abundance, and certain bacteria were enriched under high AZM concentration, potentially indicating nitrogen pathways. Additionally, rare taxa, potential pathogens and nitrogen-removal functional genera were identified as main potential hosts of ARGs.
This study aimed to investigate the short-term response of abundant-rare genera and antibiotic resistance genes (ARGs) to azithromycin (AZM, 0.05-40 mg/L) and copper (1 mg/L) combined pollution in activated sludge nitrification system at low temperature. Nitrification was as expected inhibited in stress-and post-effects periods under AZM concentration higher than 5 mg/L. Abundant and rare taxa presented dissimilar responses based on full-scale classification. Conditionally rare or abundant taxa (CRAT) were keystone taxa. Relative abundance of ammonia-oxidizing archaea increased, and three aerobic denitrifying bacteria (Brevundimonas, Comamonas and Trichococcus) were enriched (from 9.83% to 68.91% in total). Ammonia nitrogen assimilating into Org-N and denitrification may be nitrogen pathways based on predict analysis. 29 ARGs were found with more co-occurrence patterns and high concentration of AZM (greater than 5 mg/L) caused their proliferation. Impor-tantly, expect for some abundant taxa, rare taxa, potential pathogens and nitrogen-removal functional genera were the main potential hosts of ARGs.
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