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Author

Kwon, Young-Nam
Superior Membrane-based Advanced Research & Technology (SMART) Lab
Research Interests
  • Membrane, Reverse(Forward) osmosis, Membrane distillation, Hydrate-induced ice desalination

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Fouling of reverse osmosis and nanofiltration membranes by humic acid - Effects of solution composition and hydrodynamic conditions

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Title
Fouling of reverse osmosis and nanofiltration membranes by humic acid - Effects of solution composition and hydrodynamic conditions
Author
Tang, Chuyang Y.Kwon, Young-NamLeckie, James O.
Keywords
Critical flux; Fouling; Humic acid; Nanofiltration (NF); Reverse osmosis (RO)
Issue Date
200703
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF MEMBRANE SCIENCE, v.290, no.1-2, pp.86 - 94
Abstract
Fouling of reverse osmosis (RO) and nanofiltration (NF) membranes by humic acid, a recalcitrant natural organic matter (NOM), was systematically investigated. The membrane flux performance depended on both hydrodynamic conditions (flux and cross-flow velocity) and solution composition (humic acid concentration, pH, ionic strength, and calcium concentration), and was largely independent of virgin membrane properties. While increasing humic acid concentration and ionic strength, and lowering cross-flow velocity affected flux performance moderately, severe flux reduction occurred at high initial flux, low pH, and high calcium concentration. At a calcium concentration of 1 mM, all the membranes exhibited an identical stable flux, independent of their respective intrinsic membrane permeabilities. The effect of solution composition was more significant at higher fluxes. Improved salt rejection was observed as a result of humic acid fouling, which was likely due to Dorman exclusion by humic material close to membrane surfaces. Greater rejection improvement was observed for membranes with rougher surfaces.
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DOI
http://dx.doi.org/10.1016/j.memsci.2006.12.017
ISSN
0376-7388
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