Resistance of Fusarium sp spores to solar TiO₂ photocatalysis: influence of spore type and water (scaling‐up results)

Abstract

BACKGROUND: Common irrigation water disinfection methods, which may be unable to inactivate all types of pathogens or even become phytotoxic themselves, are not very effective in controlling phytopathogens. Water disinfection by photocatalysis is a promising irrigation-water treatment for destroying phytopathogens without the drawbacks of conventional disinfection methods. Previous research has shown that solar photocatalytic technology can be used in the disinfection treatment of bacteria, protozoa and fungi, either through solar disinfection only. The purpose of this work was evaluate the TiO 2 photocatalysis process to inactivate Fusarium spores in distilled and well water.

A comparative study of the bactericidal effect of photocatalytic oxidation by TiO2 on antibiotic‐resistant and antibiotic‐sensitive bacteria

“…55,56 Recently, solar TiO 2 photocatalysis has been shown to be capable of inactivating hardy fungal spores. 57 as an alternative treatment for water disinfection. With respect to the susceptibility comparisons, the antibiotic-resistant strains investigated in the present study were just limited; nonetheless, the results obtained for the tested bacteria provided a comparable dataset.…”

Solar photocatalysis for water disinfection: materials and reactor design

“…This aspect has been notified in literature, in 10 which two different CPC reactors were compared with respect to their performances to inactivate 10 3 CFU/mL of Fusarium solani spores. A 14L-CPC reactor with ratio of 0.3 (14 L of total volume and 4.7 L of illuminated volume) 50 was compared to a 60L-CPC reactor with a ratio of 0.75 51 . The 60L-CPC reactor showed 15 enhanced inactivation results using photocatalysis with TiO 2 and solar photo-degradation 51 .…”

“…A 14L-CPC reactor with ratio of 0.3 (14 L of total volume and 4.7 L of illuminated volume) 50 was compared to a 60L-CPC reactor with a ratio of 0.75 51 . The 60L-CPC reactor showed 15 enhanced inactivation results using photocatalysis with TiO 2 and solar photo-degradation 51 . On the other hand, the interrupted illumination can affect the inactivation results depending on the microbial target.…”

“…Moreover, it is important to use the appropriate flow rate to 40 guarantee that catalysts do not aggregate too much during solar treatment. 51 On the contrary, the use of immobilized photocatalysts usually introduces mass transport limitations that reduce the overall efficiency of the process, a feature that could be particularly significant in disinfection processes due to the 45 high size of microorganisms. 30 Therefore, systems using immobilized photocatalysts should be operating in different ways to those using suspended photocatalysts.…”

Benefits of photo-Fenton at low concentrations for solar disinfection of distilled water. A case study: Phytophthora capsici

“…The interest of using AOPs for disinfection has increased due to the high efficiency to inactivate different types of microorganisms. The oxidant effect of photo-Fenton for prions inactivation [15], TiO 2 and photo-Fenton to virus removal [16][17][18]26], bacteria inactivation with TiO 2 , H 2 O 2 and photo-Fenton [19][20][21]27], fungi spores inactivation with TiO 2 , H 2 O 2 and photo-Fenton [22][23][24] and oocysts of Criptosporium parvum inactivation with TiO 2 [25] have been reported in the literature.…”