DOI: 10.1016/j.watres.2018.03.074
Scopus记录号: 2-s2.0-85044921706
论文题名: Characteristics of competitive uptake between Microcystin-LR and natural organic matter (NOM) fractions using strongly basic anion exchange resins
作者: Dixit F. ; Barbeau B. ; Mohseni M.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 139 起始页码: 74
结束页码: 82
语种: 英语
英文关键词: Humic acid
; Ion exchange
; Microcystins
; Natural organic matter
; Pore blockage
Scopus关键词: Actinides
; Biogeochemistry
; Biological materials
; Ion exchange
; Ion exchange resins
; Ions
; Molecular weight distribution
; Surface waters
; Anion exchange resins
; Background concentration
; Electrostatic attractions
; Humic acid
; Microcystins
; Natural organic matters
; Pore blockages
; Resin concentrations
; Toxic materials
; anion exchange resin
; humic acid
; microcystin LR
; natural organic matter
; purolite a860
; surface water
; unclassified drug
; anion exchange resin
; microcystin
; microcystin LR
; amino acid
; comparative study
; concentration (composition)
; dose-response relationship
; ion exchange
; molecular analysis
; organic matter
; pollutant removal
; reduction
; resin
; toxicity
; Article
; comparative study
; concentration ratio
; molecular weight
; pH
; physical model
; priority journal
; static electricity
; chemistry
; humic substance
; procedures
; water management
; algae
; Anion Exchange Resins
; Humic Substances
; Microcystins
; Molecular Weight
; Water Purification
英文摘要: Microcystins are the most commonly occurring cyanotoxins, and have been extensively studied across the globe. In the present study, a strongly basic anion exchange resin was employed to investigate the removal of Microcystin-LR (MCLR), one of the most toxic microcystin variants. Factors influencing the uptake behavior included the MCLR and resin concentrations, resin dosage, and natural organic matter (NOM) characteristics, specifically, the charge density and molecular weight distribution of source water NOM. Equivalent background concentration (EBC) was employed to evaluate the competitive uptake between NOM and MCLR. The experimental data were compared with different mathematical and physical models and pore diffusion was determined as the rate-limiting step. The resin dose/solute concentration ratio played a key role in the MCLR uptake process and MCLR removal was attributed primarily to electrostatic attractions. Charge density and molecular weight distribution of the background NOM fractions played a major role in MCLR removal at lower resin dosages (200 mg/L ∼ 1 mL/L and below), where a competitive uptake was observed due to the limited exchange sites. Further, evidences of pore blockage and site reduction were also observed in the presence of humics and larger molecular weight organic fractions, where a four-fold reduction in the MCLR uptake was observed. Comparable results were obtained for laboratory studies on synthetic laboratory water and surface water under similar conditions. Given their excellent performance and low cost, anion exchange resins are expected to present promising potentials for applications involving the removal of removal of algal toxins and NOM from surface waters. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112743
Appears in Collections: 气候减缓与适应
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作者单位: Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, Canada; Department of Civil, Geological and Mining Engineering, Ecole Polytechnique de Montreal, Montreal, Quebec, Canada
Recommended Citation:
Dixit F.,Barbeau B.,Mohseni M.. Characteristics of competitive uptake between Microcystin-LR and natural organic matter (NOM) fractions using strongly basic anion exchange resins[J]. Water Research,2018-01-01,139