New insights into the concentration-dependent regulation of membrane biofouling formation via continuous nanoplastics stimulation

Liu, Xinhui, Yang, Yu, Takizawa, Satoshi, Graham, Nigel J.D., Chen, Chao, Pu, Jian and Ng, How Yong, (2024). New insights into the concentration-dependent regulation of membrane biofouling formation via continuous nanoplastics stimulation. Water Research, 253(1 April 2024), n/a-n/a

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  • Sub-type Journal article
    Author Liu, Xinhui
    Yang, Yu
    Takizawa, Satoshi
    Graham, Nigel J.D.
    Chen, Chao
    Pu, Jian
    Ng, How Yong
    Title New insights into the concentration-dependent regulation of membrane biofouling formation via continuous nanoplastics stimulation
    Appearing in Water Research
    Volume 253
    Issue No. 1 April 2024
    Publication Date 2024-02-05
    Place of Publication London
    Publisher Elsevier on behalf of the International Water Association
    Start page n/a
    End page n/a
    Language eng
    Abstract The release of nanoplastics (NPs) into the environment is growing due to the extensive use of plastic products. Numerous studies have confirmed the negative effects of NPs on microorganisms, which poses uncertainties concerning their impact on nanofiltration (NF) membrane biofouling. This study investigated the initial cell adhesion process, NF membrane biofouling kinetic processes and bacterial responses of Pseudomonas aeruginosa (P. aeruginosa) exposed to varied NPs concentrations (0–50 mg·L−1). Transcriptome analysis demonstrated that low concentration of NPs (0.1 mg·L−1) promoted bacterial quorum sensing, energy metabolism, exopolysaccharide biosynthesis and bacterial secretion systems. Correspondingly, the polysaccharide content increased remarkably to 2.77 times the unexposed control, which served as a protective barrier for bacteria to avoid the impact of NPs-induced stress. Suppressed homologous recombination, microbial metabolic potentials and flagellar assembly were detected in bacteria exposed to a high concentration (50 mg·L−1) of NPs, mainly due to the triggered reactive oxygen species (ROS) generation, genomic DNA damage, and decreased energy production. Overall, enhanced formation of the extracellular polymeric substances (EPS) and aggravated membrane flux decline were observed when NPs interacted with the membrane surface by cell secretions (low NPs levels) or cell lysis (high NPs levels). These findings shed light on understanding the microbial metabolism mechanism and membrane biofouling propensity with NPs stress at both the molecular and gene levels.
    UNBIS Thesaurus WATER TREATMENT
    WATER REUSE
    PLASTICS
    WATER POLLUTANTS
    Keyword Nanoplastics (NPs)
    Nanofiltration (NF)
    Membrane biofouling
    Transcriptome analysis
    Wastewater treatment
    Copyright Holder Elsevier Ltd.
    Copyright Year 2024
    Copyright type All rights reserved
    DOI 10.1016/j.watres.2024.121268
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    Created: Thu, 21 Mar 2024, 14:26:57 JST by Hanna Takemoto on behalf of UNU IAS