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Removal of Antibiotic-Resistant Bacteria and Antibiotic Resistance Genes Affected by Varying Degrees of Fouling on Anaerobic Microfiltration Membranes

机译:厌氧微滤膜结垢程度不同对抗生素抗性细菌和抗生素抗性基因的去除

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摘要

An anaerobic membrane bioreactor was retrofitted with polyvinylidene fluoride (PVDF) microfiltration membrane units, each of which was fouled to a different extent. The membranes with different degrees of fouling were evaluated for their efficiencies in removing three antibiotic-resistant bacteria (ARB), namely, bla_(NDM-1)-positive Escherichia coli PI-7, bla_(CTX-M-1S)-positive Klebsiella pneumoniae L7, and bla_(OXA-48)-48-positive E. coli UPEC-RIY-4, as well as their associated plasmid-borne antibiotic resistance genes (ARGs). The results showed that the log removal values (LRVs) of ARGs correlated positively with the extent of membrane fouling and ranged from 1.9 to 3.9. New membranes with a minimal foulant layer could remove more than 5 log units of ARB. However, as the membranes progressed to subcritical fouling, the LRVs of ARB decreased at increasing operating transmembrane pressures (TMPs). The LRV recovered back to 5 when the membrane was critically fouled, and the achieved LRV remained stable at different operating TMPs. Furthermore, characterization of the surface attributed the removal of both the ARB and ARGs to adsorption, which was facilitated by an increasing hydrophobicity and a decreasing surface ζ potential as the membranes fouled. Our results indicate that both the TMP and the foulant layer synergistically affected ARB removal, but the foulant layer was the main factor that contributed to ARG removal.
机译:用聚偏二氟乙烯(PVDF)微滤膜装置改造厌氧膜生物反应器,每个装置的结垢程度不同。评价具有不同结垢程度的膜在去除三种抗药性细菌(ARB)bla_(NDM-1)阳性大肠杆菌PI-7,bla_(CTX-M-1S)阳性克雷伯氏菌时的效率肺炎链球菌L7和bla_(OXA-48)-48阳性大肠杆菌UPEC-RIY-4,以及它们相关的质粒介导的抗生素抗性基因(ARG)。结果表明,ARG的对数清除值(LRVs)与膜污染程度呈正相关,范围在1.9至3.9之间。具有最小污垢层的新膜可以去除超过5 log单位的ARB。然而,随着膜发展到亚临界结垢,ARB的LRV在工作跨膜压力(TMP)升高时降低。当膜严重结垢时,LRV恢复至5,并且在不同的运行TMP时,LRV保持稳定。此外,表面的表征归因于吸附去除了ARB和ARGs,这是由于疏水性增加和膜结垢时表面ζ电势降低而促进的。我们的结果表明,TMP和污垢层均协同影响ARB的去除,但污垢层是导致ARG去除的主要因素。

著录项

  • 来源
    《Environmental Science & Technology》 |2017年第21期|12200-12209|共10页
  • 作者

    Hong Cheng; Pei-Ying Hong;

  • 作者单位

    Division of Biological and Environmental Science & Engineering (BESE), Water Desalination and Reuse Center (WDRC), King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia;

    Division of Biological and Environmental Science & Engineering (BESE), Water Desalination and Reuse Center (WDRC), King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 13:57:46

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