DOI: 10.1016/j.watres.2018.09.023
Scopus记录号: 2-s2.0-85053341904
论文题名: The relative roles of sorption and biodegradation in the removal of contaminants of emerging concern (CECs) in GAC-sand biofilters
作者: Ma B. ; Arnold W.A. ; Hozalski R.M.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 146 起始页码: 67
结束页码: 76
语种: 英语
英文关键词: Anthracite
; Drinking water treatment
; Granular activated carbon
; Hydraulic loading rate
; Throughput
; Trace organic contaminants
Scopus关键词: Activated carbon
; Amides
; Anthracite
; Biodegradation
; Biofilters
; Efficiency
; Granular materials
; Organic carbon
; Plasticizers
; Potable water
; Rate constants
; Regression analysis
; Removal
; Sand
; Throughput
; Turbines
; Wastewater reclamation
; Wastewater treatment
; Water conservation
; Water supply
; Contaminants of emerging concerns
; Dissolved organic carbon
; Granular activated carbons
; Hydraulic loading rates
; Removal efficiencies
; Trace organic contaminants
; Tris(2-chloroethyl) phosphate
; Water treatment systems
; Activated carbon treatment
; activated carbon
; anthracite
; biodegradation
; biofiltration
; concentration (composition)
; drinking water
; environmental fate
; hydraulic property
; pollutant removal
; sorption
; trace element
; wastewater treatment
; water treatment
英文摘要: The removal and fate of contaminants of emerging concern (CECs) in water treatment systems is of interest given the widespread occurrence of CECs in water supplies and increase in direct potable reuse of wastewater. In this study, CEC removal was investigated in pilot-scale biologically-active granular activated carbon (GAC)-sand and anthracite-sand filters under different hydraulic loading rates and influent CEC concentrations over a 15-month period. Eight of the most commonly detected compounds in a survey of CEC occurrence in drinking water were selected for this study: atenolol, atrazine, carbamazepine, fluoxetine, gemfibrozil, metolachlor, sulfamethoxazole and tris(2-chloroethyl) phosphate (TCEP). GAC-sand biofilters provided superior CEC removal for all compounds (mean removal efficiencies: 49.1–94.4%) compared to anthracite-sand biofilters (mean removal efficiencies: 0–66.1%) due to a combination of adsorption and biodegradation. Adsorption was determined to be the dominant removal mechanism for most selected CECs, except fluoxetine, which had the greatest biodegradation rate constant (0.93 ± 0.15 min−1 at 20–28 °C). The mean removal efficiency decreased by 16.5% when the loading rate increased from 2 to 4 gpm/ft2 (4.88–9.76 m/h). A significant reduction in CEC removal was observed after 100,000 bed volumes when the influent CEC concentration was low (100–200 ng/L), whereas no significant reduction was observed during spike dosing (1000–3000 ng/L). A regression analysis suggested that biodegradation rate, hydraulic loading rate, influent CEC concentration, throughput, influent dissolved organic carbon (DOC) concentration, and CEC charge are important parameters for predicting CEC removal performance in GAC-sand biofilters. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112382
Appears in Collections: 气候减缓与适应
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作者单位: Department of Civil, Environmental, and Geo- Engineering, University of Minnesota, 500 Pillsbury Dr. SE, Minneapolis, MN 55455, United States
Recommended Citation:
Ma B.,Arnold W.A.,Hozalski R.M.. The relative roles of sorption and biodegradation in the removal of contaminants of emerging concern (CECs) in GAC-sand biofilters[J]. Water Research,2018-01-01,146