DOI: 10.1016/j.watres.2018.04.063
Scopus记录号: 2-s2.0-85050270504
论文题名: Characterizing the capacity of hyporheic sediments to attenuate groundwater nitrate loads by adsorption
作者: Meghdadi A.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 140 起始页码: 364
结束页码: 376
语种: 英语
英文关键词: Ghezel-Ozan river
; Hyporheic zone
; Kinetic models
; Nitrate adsorption capacity
; Removal efficiency
Scopus关键词: Adsorption
; Efficiency
; Groundwater
; Health risks
; Kinetic parameters
; Kinetic theory
; Mass transfer
; Natural attenuation
; Nitrates
; Rivers
; Sediments
; Stream flow
; Adsorbate concentration
; Hyporheic zone
; Intra-particle diffusion
; Kinetic models
; Mass-transfer kinetics
; Natural attenuation capacities
; Nitrate adsorptions
; Removal efficiencies
; Nitrogen removal
; aluminum silicate
; ground water
; nitrate
; silicon dioxide
; adsorption
; concentration (composition)
; efficiency measurement
; experimental study
; groundwater
; hyporheic zone
; nitrate
; numerical model
; pollutant removal
; reaction kinetics
; sediment pollution
; adsorption
; Article
; diffusion
; priority journal
; scanning electron microscopy
; season
; sediment
; X ray diffraction
; zeta potential
; Iran
; Qezel Owzan Basin
英文摘要: Nitrate has been recognized as a global threat to environmental health. In this regard, the hyporheic zone (saturated media beneath and adjacent to the stream bed) plays a crucial role in attenuating groundwater nitrate, prior to discharge into surface water. While different nitrate removal pathways have been investigated over recent decades, the adsorption capacity of hyporheic sediments under natural conditions has not yet been identified. In this study, the natural attenuation capacity of the hyporheic-sediments of the Ghezel-Ozan River, located in the north-west of Iran, was determined. The sampled sediments (from 1 m below the stream bed) were characterized via XRD, FT-IR, BET, SEM, BJH, and Zeta potential. Nitrate adsorption was evaluated using a batch experiment with hyporheic pore-water from each study site. The study was performed in the hyporheic sediments of two morphologically different zones, including Z1 located in the parafluvial zone having the clay sediment texture (57.8% clay) with smectite/Illite mixed layer clay type and Z2 located in the river confluence area containing silty clay sediment texture (47.6% clay) with smectite/kaolinite mixed layer clay type. Data obtained from the batch experiment were subjected to pseudo-first order, pseudo-second order, intra-particle diffusion, and Elovich mass transfer kinetic models to characterize the nitrate adsorption mechanism. Furthermore, to replicate nitrate removal efficiencies of the hyporheic sediments under natural conditions, the sampled hyporheic pore-waters were applied as initial solutions to run the batch experiment. The results of the artificial nitrate solution correlated well with pseudo-second order (R2>95%; in both Z1 and Z2) and maximum removal efficiencies of 85.3% and 71.2% (adsorbent dosage 90 g/L, pH = 5.5, initial adsorbate concentration of 90 mg/L) were achieved in Z1 and Z2, respectively. The results of the nitrate adsorption analysis revealed that the nitrate removal efficiencies varied from 17.24 ± 1.86% in Z1 during the wet season to 28.13 ± 0.89% in Z2 during the dry season. The results obtained by this study yielded strong evidence of the potential of hyporheic sediments to remove nitrate from an aqueous environment with great efficiency. © 2018 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112718
Appears in Collections: 气候减缓与适应
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作者单位: Science and Engineering Faculty, School of Earth Environmental and Biological Science, Queensland University of Technology, Brisbane, QLD 4000, Australia
Recommended Citation:
Meghdadi A.. Characterizing the capacity of hyporheic sediments to attenuate groundwater nitrate loads by adsorption[J]. Water Research,2018-01-01,140