DOI: 10.1016/j.watres.2018.12.021
Scopus记录号: 2-s2.0-85059038000
论文题名: Inactivation of biofilm-bound Pseudomonas aeruginosa bacteria using UVC light emitting diodes (UVC LEDs)
作者: Gora S.L. ; Rauch K.D. ; Ontiveros C.C. ; Stoddart A.K. ; Gagnon G.A.
刊名: Water Research
ISSN: 431354
出版年: 2019
起始页码: 193
结束页码: 202
语种: 英语
英文关键词: Biofilm
; Disinfection
; Light emitting diodes
; UV
; UV LED
Scopus关键词: Bacteria
; Biofilms
; Diodes
; Disinfection
; Energy efficiency
; Irradiation
; Potable water
; Ultraviolet lamps
; Water treatment
; Degree of protection
; Design and construction
; Disinfection models
; Dose-response curves
; Pseudomonas aeruginosa
; Pseudomonas aeruginosa BACTERIA
; Surface disinfection
; Ultraviolet light emitting diodes
; Light emitting diodes
; drinking water
; activation energy
; bacterium
; biofilm
; disinfection
; dose-response relationship
; drinking
; emission
; energy efficiency
; equipment
; ultraviolet radiation
; water technology
; wavelength
; Article
; biofilm
; biomass
; disinfection
; energy cost
; nonhuman
; plate count
; priority journal
; Pseudomonas aeruginosa
; radiometry
; surface property
; ultraviolet C radiation
; water treatment
; Pseudomonas aeruginosa
英文摘要: Ultraviolet light emitting diodes (UV LEDs) are a promising technology for the disinfection of water and wetted surfaces, but research into these applications remains limited. In the drinking water field, UV LEDs emitting at wavelengths ranging from 254 nm to 285 nm (UVC LEDs) have been shown to be effective for the inactivation of numerous pathogens and pathogen surrogate organisms at UV doses comparable to conventional germicidal UV lamps. Surface disinfection with UV light, from UVC LEDs or from conventional UV lamps, is not as well understood. As the technology underlying the design and construction of UV LEDs matures and their energy efficiency improves, it is likely that they will become ubiquitous in small scale water treatment applications and surface disinfection in various industries, including the medical and dental fields. A simple, easily replicated methodology was developed and optimized to grow, irradiate, and recover biofilms from coupons. It was hypothesized that higher UV doses would be required to inactivate biofilm-bound bacteria than planktonic (free-floating) bacteria because the biofilm would provide some degree of protection from the effects of UVC irradiation. Indeed, UV LED irradiation at 265 nm achieved 1.3 ± 0.2 log inactivation of biofilm-bound Pseudomonas aeruginosa at a UV dose of 8 mJ/cm2. This inactivation level is lower than those that have been reported by researchers using UVC LEDs to inactivate planktonic P. aeruginosa, a finding that can be explained by the higher resistance of biofilm-bound bacteria to UV inactivation. A dose-response curve was developed and fitted to three disinfection models: the Chick-Watson model, the multi-target model, and the Geeraerd model. This last, which posits a subpopulation of organisms that are resistant to treatment, was a good fit to the dose-response data. ATP results obtained using the biomass recovery ATP method (ATPBR), a method that includes a 4 h incubation period after treatment, was well correlated to the results of conventional plate counts. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122060
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Civil & Resource Engineering, Dalhousie University, Halifax, NS, Canada
Recommended Citation:
Gora S.L.,Rauch K.D.,Ontiveros C.C.,et al. Inactivation of biofilm-bound Pseudomonas aeruginosa bacteria using UVC light emitting diodes (UVC LEDs)[J]. Water Research,2019-01-01