DOI: 10.1016/j.watres.2018.11.033
Scopus记录号: 2-s2.0-85056825021
论文题名: Pilot-scale comparison of cyclically and continuously operated drinking water biofilters: Evaluation of biomass, biological activity and treated water quality
作者: McKie M.J. ; Bertoia C. ; Taylor-Edmonds L. ; Andrews S.A. ; Andrews R.C.
刊名: Water Research
ISSN: 431354
出版年: 2019
起始页码: 488
结束页码: 495
语种: 英语
英文关键词: Biofilter shutdown
; Biofiltration for NDMA FP control
; Cyclical biofilter operation
; Effective activity
; Enzyme activity
; Natural and anthropogenic NDMA precursors
Scopus关键词: Bioactivity
; Biofilters
; Biomass
; Function evaluation
; Potable water
; Quality control
; Water quality
; Water treatment
; Cyclical biofilter operation
; Disinfection by product formations
; Empty bed contact time
; Formation potential
; Microbial activities
; Natural and anthropogenic NDMA precursors
; Naturally occurring
; Phosphatase activity
; Enzyme activity
; adenosine triphosphate
; drinking water
; esterase
; phosphatase
; phosphate
; bioactivity
; biofiltration
; biomass
; byproduct
; comparative study
; disinfection
; drinking water
; enzyme activity
; water quality
; Article
; biological activity
; biomass
; contact time
; controlled study
; density
; disinfection
; enzyme activity
; priority journal
; reduction (chemistry)
; water quality
; Bacteria (microorganisms)
英文摘要: The objective of this pilot study was to evaluate the impact of cyclical (operated 8–12 h per day) and continuous biofilter operation with respect to biomass development, biological enzyme activity and treated water quality (in terms of organics, nutrients and disinfection by-product (DBP) formation potential). Continuously operated biofilters developed greater densities of biomass, as measured by ATP, when compared to cyclically operated filters; reducing the empty bed contact time (EBCT) increased biomass density under continuous flow conditions. However, once normalized to biomass, it was shown that cyclically operated filters exhibited higher enzyme activity, indicating that this method of operation may improve bacterial function. Reduction of organics was generally similar for both continuous and cyclical filters with the same EBCT, however, cyclical filters demonstrated higher variability during the first 4 h following start-up. Overall, HAA formation potential was better controlled by continuously operated filters, due to poor performance by the cyclical filters upon start-up while THM precursors were removed equally well by all filters. To understand the removal capacity for NDMA precursors through biological filters, both naturally occurring NDMA FP and NDMA FP resulting from spiked anthropogenic precursors was monitored through the filter depth. All the filters removed 90% of the naturally occurring NDMA FP within the first 45 cm; cyclical operation resulted in higher reduction of spiked anthropogenic NDMA precursors (50% higher than continuously operated) demonstrating the advantage of routine shut down on overall microbial activity. Tools to monitor and predict biofilter performance are in high demand. Here we present an “effective activity” term which combines enzyme activity with contact time (EBCT). Effective esterase activity was strongly correlated to DOC reduction as a function of filter operation (cyclical or continuous) and EBCT; effective phosphatase activity was indicative of phosphate removal. The results of this study indicate that routine shut down of the filters as this location improved enzyme activity without compromising control of chlorinated DBPs (THMs and HAAs) or NDMA derived from natural and anthropogenic precursors. © 2018 Elsevier Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122142
Appears in Collections: 气候变化事实与影响
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作者单位: University of Toronto, Department of Civil and Mineral Engineering, Canada
Recommended Citation:
McKie M.J.,Bertoia C.,Taylor-Edmonds L.,et al. Pilot-scale comparison of cyclically and continuously operated drinking water biofilters: Evaluation of biomass, biological activity and treated water quality[J]. Water Research,2019-01-01