Toxicity of tetracycline and its transformation products to a phosphorus removing Shewanella strain

文献类型： 外文期刊

第一作者： Long, Sha

作者： Long, Sha;Yang, Yongkui;Xiang, Feng;Sun, Peizhe;Zhao, Lin;Long, Sha;Pavlostathis, Spyros G.;Li, Na

作者机构：

关键词： Tetracycline; Transformation products; Inhibition; Phosphorus removal; Antibacterial activity; Shewanella

期刊名称：CHEMOSPHERE （ 影响因子：7.086； 五年影响因子：6.956 ）

ISSN： 0045-6535

年卷期： 2020 年 246 卷

页码：

收录情况： SCI

摘要： Tetracycline (TC) as an emerging contaminant has raised serious concerns about its toxicity and removal in wastewater treatment processes. The more toxic transformation products of TC, 4-epitetracycline (ETC), anhydrotetracycline (ATC) and 4-epianhydrotetracycline (EATC) are also widely detected. This study investigated the antibacterial and bactericidal activity of TC, ETC, ATC, EATC against Shewanella sp, using Escherichia coli and Pseudomonas aeruginosa strains as quality controls. Further, batch assays were conducted to investigate the inhibition of these antibiotics on the phosphorus removal of the Shewanella strain, and removal mechanisms of TC and its transformation products (TCs). The inhibition on phosphorus removal by the Shewanella strain at 20 mg L-1 was in the order of ATC > EATC > TC > ETC. COD removal, poly-P accumulation and glycogen synthesis by the Shewanella strain were also inhibited. Biodegradation was the main removal mechanism of TC and ETC, while adsorption was the main one of ATC and EATC. This study helps to further understand the structure-activity relationship of TC. (C) 2019 Published by Elsevier Ltd.

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