期刊
BIORESOURCE TECHNOLOGY
卷 354, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.127217
关键词
Integrated vertical-flow constructed wetland; Spatial distribution; Carbon-nitrogen; Microbial community; Antibiotic
资金
- National Natural Science Foundation of China [51808431, 51778522]
- Key Research and Development Project of Shaanxi Province [2022SF-454]
- Fund for Postdoctoral Scientific Research Project, China [2017M613290XB]
This study demonstrates the effects of sulfamethoxazole on carbon-nitrogen transformation and microbial community in constructed wetlands. The results show that sulfamethoxazole can be co-metabolized with organic pollutants, resulting in a high removal rate. Additionally, sulfamethoxazole promotes the enrichment of co-metabolizing bacteria and functional genes involved in denitrification, leading to an increase in denitrification rate.
This study demonstrates effects of sulfamethoxazole (SMX) on carbon-nitrogen transformation pathways and microbial community and metabolic function response mechanisms in constructed wetlands. Findings showed co-metabolism of SMX with organic pollutants resulted in high removal of 98.92 +/- 0.25% at influent concentrations of 103.08 +/- 13.70 mu g/L (SMX) and 601.92 +/- 22.69 mg/L (COD), and 2 d hydraulic retention. Microbial community, co-occurrence networks, and metabolic pathways analyses showed SMX promoted enrichment of COD and SMX co-metabolizing bacteria like Mycobacterium, Chryseobacterium and Comamonas. Relative abundances of co-metabolic pathways like Amino acid, carbohydrate, and Xenobiotics biodegradation and metabolism were elevated. SMX also increased relative abundances of the resistant heterotrophic nitrification-aerobic denitrification bacteria Paracoccus and Comamonas and functional genes nxrA, narI, norC and nosZ involved in simultaneous heterotrophic nitrification-aerobic denitrification. Consequently, denitrification rate increased by 1.30 mg/(L.d). However, insufficient reaction substrate and accumulation of 15.29 +/- 2.30 mg/L NO3--N exacerbate inhibitory effects of SMX on expression of some denitrification genes.
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