DOI: 10.1016/j.watres.2019.02.029
Scopus记录号: 2-s2.0-85062959039
论文题名: Spatio-temporal dynamics of virus and bacteria removal in dual-media contact-filtration for drinking water
作者: Nilsen V. ; Christensen E. ; Myrmel M. ; Heistad A.
刊名: Water Research
ISSN: 431354
出版年: 2019
起始页码: 9
结束页码: 22
语种: 英语
英文关键词: Drinking water
; Dynamics
; Filtration
; Modeling
; Virus
Scopus关键词: Biological filter beds
; Dynamics
; Efficiency
; Effluents
; Escherichia coli
; Filtration
; Importance sampling
; Models
; Potable water
; Risk assessment
; Salmonella
; Turbidity
; Viruses
; Water treatment
; Effluent turbidity
; Filter coefficients
; Filtration process
; Filtration theory
; Microbial risk assessment
; Removal efficiencies
; Salmonella typhimurium
; Spatio-temporal dynamics
; Water filtration
; Bacteria (microorganisms)
; Salmonella typhimurium
英文摘要: Microorganism removal efficiencies in deep bed filters vary with time and depth in the filter bed as the filter collects particles. Improved knowledge of such dynamics is relevant for the design, operation and microbial risk assessment of filtration processes for drinking water treatment. Here we report on a high-resolution spatio-temporal characterization of virus and bacteria removal in a pilot-scale dual-media filter, operated in contact-filtration mode. Microorganisms investigated were bacteriophage Salmonella typhimurium 28B (plaque assay, n=154)), fRNA phage MS2 (plaque assay/RT-qPCR, n=87) and E. coli (Colilert-18, n=73). Microscopic and macroscopic filtration models were used to investigate and characterize the removal dynamics. Results show that ripening/breakthrough fronts for turbidity, viruses and E. coli migrated in a wave-like manner across the depth of the filter. Virus removal improved continuously throughout the filter cycle and viruses broke through almost simultaneously with turbidity. Ripening for E. coli took longer than ripening for turbidity, but the bacteria broke through before turbidity breakthrough. Instantaneous log-removal peaked at 3.2, 3.0 and 4.5 for 28B, MS2 and E. coli, respectively. However, true average log-removal during the period of stable effluent turbidity was significantly lower at 2.5, 2.3 and 3.6, respectively. Peak observed filter coefficients λ were higher than predicted by ideal filtration theory. This study demonstrates the importance of carefully designed sampling regimes when characterizing microorganism removal efficiencies of deep bed filters. © 2019 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/121880
Appears in Collections: 气候变化事实与影响
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作者单位: Norwegian University of Life Sciences, Faculty of Science and Technology, P.O.Box 5003, Ås, N-1432, Norway; Norwegian University of Life Sciences, Faculty of Veterinary Medicine, P.O.Box 8146 Dep, Oslo, N-0033, Norway
Recommended Citation:
Nilsen V.,Christensen E.,Myrmel M.,et al. Spatio-temporal dynamics of virus and bacteria removal in dual-media contact-filtration for drinking water[J]. Water Research,2019-01-01