Coaggregation dynamics in drinking water biofilms and implications for chlorine disinfection.

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  • Additional Information
    • Source:
      Publisher: Elsevier Country of Publication: Netherlands NLM ID: 9422688 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1873-3336 (Electronic) Linking ISSN: 03043894 NLM ISO Abbreviation: J Hazard Mater Subsets: MEDLINE
    • Publication Information:
      Original Publication: Amsterdam : Elsevier,
    • Subject Terms:
      Biofilms*/drug effects ; Drinking Water*/microbiology ; Disinfectants*/pharmacology ; Disinfection*/methods ; Sodium Hypochlorite*/pharmacology ; Water Purification*/methods; Chlorine/pharmacology ; Chlorine/chemistry ; Stenotrophomonas maltophilia/drug effects ; Water Microbiology ; Polyvinyl Chloride/chemistry
    • Abstract:
      Biofilms in drinking water (DW) systems persistently challenge traditional disinfection methods due to intricate microbial interactions, with coaggregation playing a crucial role in forming multispecies biofilms. This study examined the implications of coaggregation on tolerance towards sodium hypochlorite (NaOCl) disinfection. Dual-species biofilms were formed for seven days on polyvinyl chloride coupons, comprising a strain of the emerging pathogen Stenotrophomonas maltophilia and the coaggregating strain Delftia acidovorans 005 P. For comparison, dual-species biofilms were also formed with a non-coaggregation strain (D. acidovorans 009 P). The minimum bactericidal concentration (MBC) for each planktonic strain varied (D. acidovorans: 1 mg/L, S. maltophilia: 1.5 mg/L) below the safe DW treatment limits. However, high NaOCl doses (10 ×MBC and 100 ×MBC,) showed low efficacy against dual-species biofilms, indicating significant biofilm tolerance to disinfection. Membrane damage occurred at sub-MBC without culturability loss, underscoring biofilm resilience. The biofilm analysis revealed a complex interplay between the composition of extracellular polymeric substances and the architecture, which was influenced by the presence of the coaggregating strain. Overall, coaggregation significantly influenced biofilm formation and resilience, impacting NaOCl disinfection. These findings underscore the challenges of microbial interactions in biofilms, emphasizing the need for improved disinfection strategies to control biofilms in drinking water systems.
      Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
      (Copyright © 2024 The Authors. Published by Elsevier B.V. All rights reserved.)
    • Contributed Indexing:
      Keywords: Biofilm characterization; Biofilm control; Coaggregation; Drinking water disinfection; Sodium hypochlorite
    • Accession Number:
      0 (Drinking Water)
      0 (Disinfectants)
      DY38VHM5OD (Sodium Hypochlorite)
      4R7X1O2820 (Chlorine)
      9002-86-2 (Polyvinyl Chloride)
    • Publication Date:
      Date Created: 20240929 Date Completed: 20241130 Latest Revision: 20241130
    • Publication Date:
      20241202
    • Accession Number:
      10.1016/j.jhazmat.2024.135948
    • Accession Number:
      39342844