Evaluation of nitrogen conversion pathway during composting under amoxicillin stress: Mainly driven by core microbial community.

Fangyi Pei, Hao Ding, Ziliang Yin, Zeming Ye, Wenxiang Ping, Jingping Ge

Bioresource technology 2021 Apr

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The aim of this study was to explore the effects of different concentrations of amoxicillin (AMX) on nitrogen (N) conversion and bacterial community structure during aerobic composting. The results revealed that AMX led to a lower temperature and increased pH during the thermophilic phase of composting. AMX inhibited the relative abundance (RA) of Firmicutes at the initial phase but increased the RA of Actinobacteria and Bacteroidetes compared with the control treatment. The core bacterial community linked to N conversion was determined by network analysis. AMX decreased the RA of amoA, a gene related to nitrification, and increased the RAs of nirK and nosZ, which are related to denitrification. Meanwhile, AMX inhibited the activity of ammonia-oxidizing bacteria but promoted the activity of denitrifying bacteria. Therefore, the main adverse effect of AMX on compost quality is to change the microbial community structure and affect the physical and chemical properties of composting. Copyright © 2021 Elsevier Ltd. All rights reserved.

Citation

Fangyi Pei, Hao Ding, Ziliang Yin, Zeming Ye, Wenxiang Ping, Jingping Ge. Evaluation of nitrogen conversion pathway during composting under amoxicillin stress: Mainly driven by core microbial community. Bioresource technology. 2021 Apr;325:124701