Photocatalytically‐mediated disinfection of water using tio2as a catalyst and spore‐formingBacillus pumilusas a model
- 1 March 1995
- journal article
- research article
- Published by Taylor & Francis in Journal of Environmental Science and Health . Part A: Environmental Science and Engineering and Toxicology
- Vol. 30 (3) , 627-636
- https://doi.org/10.1080/10934529509376221
Abstract
The photocatalytic oxidation process has been evaluated as a basis for disinfecting large volumes of water. A 95 percent reduction in viability of B. pumilus spores, suspended with TiO2 in water, was observed after exposing the model organism to ultraviolet (UV) light (λ 365 nm). Kinetic plots showed that the viability of B. pumilus spores decreased exponentially. No reduction in viability occurred if B. pumilus spores were incubated in the dark (control) or if illumination occurred in the absence of a TiO2 catalyst (TiO2 condition). Intermittent illumination reduced viable B. pumilus spores more effectively than continuous exposure to UV. For various TiO2 concentrations suspended in water from 1 mg/ml to 4 mg/ml, maximum losses of viability were observed at TiO2 concentrations of 2 mg/ml of water and spore densities ≥ 109 CFU/ml. On the basis of the data presented here, the TiO2‐based photocatalytic process shows significant potential as a basis for both stationary and portable water disinfecting devices.Keywords
This publication has 17 references indexed in Scilit:
- Behavior of Pollutant-Degrading Microorganisms in Aquifers: Predictions for Genetically Engineered OrganismsEnvironmental Science & Technology, 1994
- Modeling Adsorption of TCE by Activated Carbon Preloaded by Background Organic MatterEnvironmental Science & Technology, 1994
- Photocatalytic degradation of wastewater pollutants. Titanium-dioxide-mediated oxidation of polynuclear aromatic hydrocarbonsJournal of Photochemistry and Photobiology A: Chemistry, 1994
- Air stripping of organics from ground waterWaste Management, 1993
- Evidence of critical illumination and dark recovery times for increasing the photoefficiency of aqueous heterogeneous photocatalysisJournal of Photochemistry and Photobiology A: Chemistry, 1993
- Field testing solar photocatalytic detoxification on TCE‐contaminated groundwaterEnvironmental Progress, 1993
- Photodegradation of dichlorophenols and trichlorophenols in TiO2 aqueous suspensions: kinetic effects of the positions of the Cl atoms and identification of the intermediatesJournal of Photochemistry and Photobiology A: Chemistry, 1993
- UV photolytic degradation of butyltin chlorides in waterJournal of Photochemistry and Photobiology A: Chemistry, 1993
- Photomineralization of 4-chlorophenol sensitized by titanium dioxide: a study of the initial kinetics of carbon dioxide photogenerationJournal of Photochemistry and Photobiology A: Chemistry, 1993
- Photocatalytic degradation of phenol in the presence of near-UV illuminated titanium dioxideJournal of Photochemistry and Photobiology A: Chemistry, 1992