Direct oxidation of peroxymonosulfate under natural solar radiation: Accelerating the simultaneous removal of organic contaminants and pathogens from water. (September 2021)

• Record Type: Journal Article
• Authors: Berruti, Ilaria; Oller, Isabel; Polo-López, María Inmaculada
• Is Part Of: Chemosphere. Volume 279(2021)
• Publication Date: 2021-09
• Subjects: E. coli O157:H7 -- E. faecalis -- P. aeruginosa -- Contaminants of emerging concern -- Peroxymonosulfate -- Sunlight; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2021.130555
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: This study investigates the effectiveness of non-activated peroxymonosulfate (PMS) as oxidative agent for water purification in the presence and absence of natural solar radiation. The inactivation of three pathogens ( Escherichia coli, Enterococcus faecalis and Pseudomonas aeruginosa ) and degradation of three Contaminants of Emerging Concern (CECs) (Trimethoprim-TMP, Sulfamethoxazole-SMX and Diclofenac-DCF) was simultaneously assessed in isotonic water (IW) by testing a wide range of PMS concentrations (from 0.0001 to 0.01 mM). A significant oxidative effect of PMS in darkness was obtained for both bacteria and CEC abatement, but when irradiated with solar light, results demonstrated a great enhancement on all bacterial kinetic rates, reaching >5 Log reduction in 30 min (1.5 kJL −1 of QUV ) with 0.005 mM of oxidant as the best concentration. For CECs, higher degradation performance was obtained with 0.01 mM, 80% removal of DCF, SMX and TMP was achieved in 16 min (1.5 kJL −1 ), 27 min (9.4 kJL −1 ) and 150 min (16.8 kJL −1 ), respectively. Besides, the influence of inorganic species on the global PMS/solar system performance was assessed by testing its effectiveness in distilled water (DW), natural well water (WeW) and diluted well water (d-WeW) at 0.01 mM. Results revealed that (i) high chloride concentration (IW) has an important positive effect, (ii) the presence of a complex inorganic chemical water composition reduced the system efficiency (WeW), and (iii) no differences were obtained from the presence of low or high contents of carbonates/bicarbonates (WeW versus d-WeW), obtaining the following global PMS/solar efficiency performance order: IW > DW > WeW = d-WeW. Graphical abstract: Image 1 Highlights: Simultaneous abatement of CECs and bacteria by PMS direct oxidation was proved. Best PMS concentration to disinfect and decontaminated water was 0.01 mML -1 . A synergistic effect on bacterial inactivation by PMS and sunlight was obtained. Presence of inorganic species in water strongly affect the process efficiency.