DOI: 10.1016/j.watres.2018.07.060
Scopus记录号: 2-s2.0-85050875530
论文题名: Concomitant inactivation of Acanthamoeba spp. and Escherichia coli using suspended and immobilized TiO2
作者: Adán C. ; Magnet A. ; Fenoy S. ; Pablos C. ; del Águila C. ; Marugán J.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 144 起始页码: 512
结束页码: 521
语种: 英语
英文关键词: Acanthamoeba spp
; Escherichia coli
; Immobilized TiO2
; Photocatalysis
; TiO2
; Water disinfection
Scopus关键词: Chemical reactors
; Cytology
; Deionized water
; Disinfection
; Efficiency
; Effluent treatment
; Effluents
; Escherichia coli
; Photocatalysis
; Wastewater treatment
; Acanthamoeba
; Escherichia coli bacteria
; Immobilized TiO2
; Inactivation mechanisms
; Photocatalytic disinfections
; TiO2
; Titanium dioxides (TiO2)
; Water disinfections
; Titanium dioxide
; reactive oxygen metabolite
; titanium dioxide
; water
; bacterium
; catalysis
; chemical composition
; chemical substance
; disinfection
; effluent
; immobilization
; oxide
; prokaryote
; reactive oxygen species
; slurry
; wastewater treatment plant
; Acanthamoeba
; Article
; cell structure
; chemical composition
; cytoplasm
; disinfection
; Escherichia coli
; immobilization
; inactivation rate constant
; limit of detection
; mechanical stress
; nonhuman
; osmotic stress
; photocatalysis
; photolysis
; priority journal
; trophozoite
; waste water treatment plant
; Acanthamoeba
; Bacteria (microorganisms)
; Escherichia coli
英文摘要: This work reports the application of photocatalytic disinfection to the inactivation of Acanthamoeba trophozoites, a free-living pathogenic amoeba. Two types of photocatalytic reactors configurations have been used: i) a slurry reactor using suspended titanium dioxide (TiO2); and, ii) a fixed-bed reactor using immobilized TiO2 onto glass Raschig rings. The effect of the chemical composition of water has been analysed, comparing the efficiency of the process in deionized water (DW) and synthetic wastewater treatment plant effluent (SWTPE). The inactivation of Acanthamoeba spp. has been compared to that of Escherichia coli bacteria, being also analysed the concomitant inactivation of both microorganisms. Our results show that 99% of inactivation of E. coli and Acanthamoeba spp. can be achieved using photocatalysis in both reactor configurations, but interestingly, the kinetics of inactivation of both microorganisms together differs from that found with them separately. Particularly, E. coli seems to be more resistant to the inactivation in the presence of Acanthamoeba spp. which has been justified by the screen effect caused by the bigger size of Acanthamoeba spp. This observation is more pronounced in DW as the composition of the SWTPE prevent the microorganisms from suffering osmotic and/or mechanical stress and protect cellular structures to the attack of reactive oxygen species (ROS). On the other hand, the difference between the inactivation rate of E. coli and Acanthamoeba, points out the importance of the different inactivation mechanisms, suggesting that the entry of small TiO2 particles into the cytoplasm of the Acanthamoeba cells provokes the attack of inner structures and as a consequence a faster inactivation. This mechanism is not possible when the catalyst is immobilized leading to a higher cell resistance to inactivation and consequently lower efficiency of the disinfection process. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112491
Appears in Collections: 气候减缓与适应
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作者单位: Department of Chemical and Environmental Technology (ESCET), University Rey Juan Carlos, C/Tulipán s/n, Móstoles, Madrid 28933, Spain; Laboratorio de Parasitología, Universidad San Pablo-CEU, CEU Universities, Boadilla del Monte (Montepríncipe), Ctra Boadilla del Monte Km. 5.3Madrid 28668, Spain
Recommended Citation:
Adán C.,Magnet A.,Fenoy S.,et al. Concomitant inactivation of Acanthamoeba spp. and Escherichia coli using suspended and immobilized TiO2[J]. Water Research,2018-01-01,144