Enhanced removal of sulfamethoxazole and tetracycline in bioretention cells amended with activated carbon and zero-valent iron: System performance and microbial community

doi:10.1016/j.scitotenv.2021.148992

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	Enhanced removal of sulfamethoxazole and tetracycline in bioretention cells amended with activated carbon and zero-valent iron: System performance and microbial community
	Xu, Yan 1; Liu, Yuwei 1; Zhang, Benchi 1; Bu, Chibin 2; Wang, Yajun 3; Zhang, Danyi 1; Xi, Muhua 1; Qin, Qingdong 1
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2021-11-25
卷号	797
关键词	Bioretention cells Activated carbon Zero-valent iron Antibiotics Microbial community
ISSN号	0048-9697
DOI	10.1016/j.scitotenv.2021.148992
英文摘要	Antibiotics, heavily used as medicine, enter the environment inevitably and raise concerns of the risk to the ecosystems. In this study, we explored the removal efficiency and mechanism of sulfamethoxazole (SMX) and tetracycline (TC) in activated carbon (AC) and AC-zero-valent iron amended bioretention cells (AC-BRC and AC-Fe-BRC) compared with a conventional bioretention cell (BRC). Moreover, the system performance of BRCs, the shifts of the microbial community, as well as the fate of corresponding antibiotic resistance genes (ARGs) were comprehensively investigated. The results showed that, exposed to antibiotics notwithstanding, AC-BRC and AC-Fe-BRC significantly outperformed BRC on total nitrogen (TN) removal (BRC: 70.36 +/- 13.61%; AC-BRC: 91.43 +/- 6.41%; AC-Fe-BRC: 83.44 +/- 12.13%). Greater than 97% of the total phosphorous (TP) was removed in ACFe-BRC, remaining unimpacted despite of the selective pressure from SMX/TC. Excellent removals of antibiotics (above 99%) were achieved in AC-BRC and AC-Fe-BRC regardless of the types and initial concentrations (0.8 mg/L, 1.2 mg/L and 1.6 mg/L) of antibiotics, dwarfing the removal performance of BRC (12.2 +/- 4.4%-64.2 +/- 5.5%). The illumina high throughput sequencing analysis demonstrated the concomitant variations of microbial communities as SMX/TC was loaded. AC layers tended to alleviate the adverse effect of SMX/TC on microbial biodiversity. Proteobacteria (34.55-68.47%), Chloroflexi (7.13-33.54%), and Bacteroidetes (6.20-21.03%) were the top three dominant phyla in the anaerobic zone of the BRCs. The abundance of antibiotic resistance genes (ARGs) sulI, sulII and tetA genes were dramatically higher in AC-BRC and AC-Fe-BRC when exposed to 0.8 mg/L SMX/TC, which indicated that relatively low concentrations of SMX/TC induced the production of these three ARGs in the presence of AC. Although the amendment of AC led to highly efficient SMX/TC removals, further investigation is still required to improve the retention of ARGs in BRCs. (c) 2018 Elsevier B.V. All rights reserved.
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000697724500013
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/148819]
专题	土木工程学院
作者单位	1.Southeast Univ, Sch Civil Engn, Dept Municipal Engn, Nanjing 210096, Jiangsu, Peoples R China; 2.Southeast Univ, Sch Med, Zhongda Hosp, Dept Gastroenterol, Nanjing 210096, Jiangsu, Peoples R China; 3.Lanzhou Univ Technol, Sch Civil Engn, Lanzhou 730050, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Xu, Yan,Liu, Yuwei,Zhang, Benchi,et al. Enhanced removal of sulfamethoxazole and tetracycline in bioretention cells amended with activated carbon and zero-valent iron: System performance and microbial community[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2021,797.
APA	Xu, Yan.,Liu, Yuwei.,Zhang, Benchi.,Bu, Chibin.,Wang, Yajun.,...&Qin, Qingdong.(2021).Enhanced removal of sulfamethoxazole and tetracycline in bioretention cells amended with activated carbon and zero-valent iron: System performance and microbial community.SCIENCE OF THE TOTAL ENVIRONMENT,797.
MLA	Xu, Yan,et al."Enhanced removal of sulfamethoxazole and tetracycline in bioretention cells amended with activated carbon and zero-valent iron: System performance and microbial community".SCIENCE OF THE TOTAL ENVIRONMENT 797(2021).