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
Document type:
Article
Collection:
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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 YongTitle 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 POLLUTANTSKeyword Nanoplastics (NPs)
Nanofiltration (NF)
Membrane biofouling
Transcriptome analysis
Wastewater treatmentCopyright Holder Elsevier Ltd. Copyright Year 2024 Copyright type All rights reserved DOI 10.1016/j.watres.2024.121268 -
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