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Biodegradation and Adsorption of Antibiotics in the Activated Sludge Process

机译：活性污泥法中抗生素的生物降解与吸附

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摘要

The removal of 11 antibiotics of 6 classes, that is, two β-lactams (ampicillin and cefalexin), two sulfonamides (sul-famethoxazole and sulfadiazine), three fluoroquinolones (norfloxacin, ofloxacin, and ciprofloxacin), one tetracyclines (tetracycline), two macorlides (roxithromycin and anhydro-erythromycin), and one others (trimethoprim), in activated sludge process was investigated using two series of batch reactors treating freshwater and saline sewage respectively. At environmental relevant concentrations tested in this study, biodegradation and adsorption were the major removal routes for the target antibiotics, where volatilization and hydrolysis were neglectable. Among the 11 target antibiotics, cefalexin and the two sulfonamides were predominantly removed by biodegradation in both freshwater and saline sewage systems. Ampicillin, norfloxacin, ciprofloxacin, ofloxacin, tetracycline, roxithromycin, and trimethoprim were mainly removed by adsorption. Divalent cations (Ca~(2+) and Mg~(2+)) in saline sewage significantly decreased the adsorption of the three fluoroquinolones onto activated sludge. These three fluoroquinolones also exhibited certain biodegradability in the saline activated sludge reactor. Erythromycin-H_2O was persistent in both saline and freshwater systems under the experimental conditions and could not be removed at all. Kinetics study showed that biodegradation of cefalexin, the two sulfonamides and the three fluoroquinolones followed first-order model well (R~2: 0.921-0.997) with the rate constants ranging from 5.2 × 10~(-3) to 3.6 × 10~(-1) h~(-1).
机译：去除6种类别的11种抗生素，即两种β-内酰胺（氨苄青霉素和头孢氨苄），两种磺酰胺（磺胺甲氧唑和磺胺嘧啶），三种氟喹诺酮类（诺氟沙星，氧氟沙星和环丙沙星），一种四环素（四环素），两种使用两个分别处理淡水和盐水的间歇式反应器，研究了活性污泥法中的大环内酯类（罗霉素，脱水红霉素）和另一个（甲氧苄啶）。在这项研究中测试的与环境有关的浓度下，生物降解和吸附是目标抗生素的主要去除途径，其中挥发和水解可忽略不计。在11种目标抗生素中，头孢氨苄和两种磺酰胺主要是通过淡水和含盐污水处理系统中的生物降解去除的。氨苄西林，诺氟沙星，环丙沙星，氧氟沙星，四环素，罗红霉素和甲氧苄啶主要通过吸附去除。含盐污水中的二价阳离子（Ca〜（2+）和Mg〜（2+））显着降低了三种氟喹诺酮类对活性污泥的吸附。这三种氟喹诺酮类在盐活化污泥反应器中也表现出一定的生物降解性。在实验条件下，红霉素-H_2O在盐水和淡水系统中均持久存在，根本无法去除。动力学研究表明，头孢氨苄，两种磺酰胺类和三种氟喹诺酮类生物降解均符合一级模型（R〜2：0.921-0.997），速率常数范围为5.2×10〜（-3）至3.6×10〜（ -1）h〜（-1）。

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  • 来源
    《Environmental Science & Technology》 |2010年第9期|P.3468-3473|共6页
  • 作者

    BING LI; rnTONG ZHANG;

  • 作者单位

    Environmental Biotechnology Laboratory, Department of Civil Engineering, The University of Hong Kong, Hong Kong SAR, China;

    rnEnvironmental Biotechnology Laboratory, Department of Civil Engineering, The University of Hong Kong, Hong Kong SAR, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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