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

• DOI: 10.1016/j.jhazmat.2023.132348
• Publication Date: 2023-08-19T06:57:07Z
• Authors: Isabel M. Oliveira; Inês B. Gomes; Tânia Moniz; Lúcia Chaves Simões; Maria Rangel; Manuel Simões
• Keywords: Stenotrophomonas maltophilia; Disinfectant

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