Realism-based assessment of the efficacy of potassium peroxymonosulphate on Stenotrophomonas maltophilia biofilm control

Isabel M Oliveira; Inês B Gomes; Tânia Moniz; Lúcia Chaves Simões; Maria Rangel; Manuel Simões

doi:10.1016/j.jhazmat.2023.132348

Realism-based assessment of the efficacy of potassium peroxymonosulphate on Stenotrophomonas maltophilia biofilm control

J Hazard Mater. 2023 Oct 15:460:132348. doi: 10.1016/j.jhazmat.2023.132348. Epub 2023 Aug 19.

Authors

Isabel M Oliveira¹, Inês B Gomes¹, Tânia Moniz², Lúcia Chaves Simões³, Maria Rangel⁴, Manuel Simões⁵

Affiliations

¹ LEPABE - Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr Roberto Frias, 4200-465 Porto, Portugal; ALiCE - Associate Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr Roberto Frias, 4200-465 Porto, Portugal.
² REQUIMTE, LAQV - Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, Rua do Campo Alegre, s/n, 40169-007 Porto, Portugal; REQUIMTE, LAQV - Instituto de Ciências Biomédicas de Abel Salazar, University of Porto, Rua de Jorge Viterbo de Ferreira, 228, 4050-313 Porto, Portugal.
³ CEB - Centre of Biological Engineering, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal; LABBELS - Associate Laboratory in Biotechnology, Bioengineering and Microelectromechanical Systems, Braga/Guimarães, Portugal.
⁴ REQUIMTE, LAQV - Instituto de Ciências Biomédicas de Abel Salazar, University of Porto, Rua de Jorge Viterbo de Ferreira, 228, 4050-313 Porto, Portugal.
⁵ LEPABE - Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr Roberto Frias, 4200-465 Porto, Portugal; ALiCE - Associate Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr Roberto Frias, 4200-465 Porto, Portugal. Electronic address: mvs@fe.up.pt.

PMID: 37625295
DOI: 10.1016/j.jhazmat.2023.132348

Abstract

The potential of pentapotassium bis(peroxymonosulphate) bis(sulphate) (OXONE) to control biofilms in drinking water distribution systems (DWDS) was evaluated and compared to chlorine disinfection. Mature biofilms of drinking water (DW)-isolated Stenotrophomonas maltophilia were formed using a simulated DWDS with a rotating cylinder reactor (RCR). After 30 min of exposure, OXONE at 10 × minimum bactericidal concentration (MBC) caused a significant 4 log reduction of biofilm culturability in comparison to the unexposed biofilms and a decrease in the number of non-damaged cells below the detection limit (4.8 log cells/cm²). The effects of free chlorine were restricted to approximately 1 log reduction in both biofilm culturability and non-damaged cells. OXONE in synthetic tap water (STW) at 25 ºC was more stable over 40 days than free chlorine in the same conditions. OXONE solution exhibited a disinfectant decrease of about 10% of the initial concentration during the first 9 days, and after this time the values remained stable. Whereas possible reaction of chlorine with inorganic and organic substances in STW contributed to free chlorine depletion of approximately 48% of the initial concentration. Electron paramagnetic resonance (EPR) spectroscopy studies confirmed the presence of singlet oxygen and other free radicals during S. maltophilia disinfection with OXONE. Overall, OXONE constitutes a relevant alternative to conventional DW disinfection for effective biofilm control in DWDS.

Keywords: Biofilm; Chemical stability; Disinfection; Drinking water; Pentapotassium bis(peroxymonosulphate) bis(sulphate) (OXONE); Stenotrophomonas maltophilia.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Biofilms
Chlorides
Chlorine
Drinking Water*
Halogens
Potassium
Stenotrophomonas maltophilia*

Substances

Chlorine
potassium peroxymonosulfuric acid
Drinking Water
peroxymonosulfate
Halogens
Chlorides
Potassium