Relating solute properties of contaminants of emerging concern and their rejection by forward osmosis membrane

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To elucidate the transport of emerging contaminants (CECs) in forward osmosis (FO) membrane process according to their solute properties, the rejections of CECs with various molecular weight, octanol/water partition coefficient (log Kow), and dissociation constant (pK(a)) were investigated. Among 12 selected CECs, negatively charged CECs exhibited the highest rejection efficiency than neutral or positively charged CECs due to the electrostatic repulsion between negatively charged CECs and membrane surfaces as well as diffusional hindrance by reversely transported salts from draw stream. The statistical analysis showed that the molecular weight was strongly correlated with the rejection of neutral CECs by size exclusion. Moreover, the correlation between adsorption and log Kow value of neutral CECs was observed due to the hydrophobic interaction. Positively charged CECs exhibited higher adsorption, but lower rejection than the negatively charged CECs due to the locally increased concentration by adsorption, and subsequent migration in FO membrane. (C) 2018 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2018-10
Language
English
Article Type
Article
Keywords

TRACE ORGANIC CONTAMINANTS; WASTE-WATER TREATMENT; REVERSE-OSMOSIS; NANOFILTRATION MEMBRANES; NF/RO MEMBRANES; REMOVAL; RO; MICROPOLLUTANTS; PHARMACEUTICALS; ADSORPTION

Citation

SCIENCE OF THE TOTAL ENVIRONMENT, v.639, pp.673 - 678

ISSN
0048-9697
DOI
10.1016/j.scitotenv.2018.05.078
URI
http://hdl.handle.net/10203/244526
Appears in Collection
CE-Journal Papers(저널논문)
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