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Influence of inorganic scalants and natural organic matter on nanofiltration membrane fouling
Author(s)
Jarusutthirak, Chalor
Mattaraj, Supatpong
Jiraratananon, Ratana
Date Issued
January 5, 2007
Type
Article
Abstract
The influence of inorganic scalants and NOM on nanofiltration (NF) membrane fouling was investigated by a crossflow bench-scale test cell. Mathematical fouling models were used to determine kinetics and fouling mechanisms of NF membrane. It was observed that, with natural organic matter (NOM) at a concentration of 10 mg L-1, divalent cation, i.e. calcium (Ca2+), exhibited greater flux decline than monovalent cation, i.e. sodium (Na+), while solution flux curves dominated cake formation model, especially at high ionic strength. For inorganic scalants of polyanions, i.e. carbonate (CO32-), sulphate (SO42-), and phosphate (PO43-), solution flux curves were relatively fitted well with pore blocking model, possibly due to precipitated species formed and blocked on membrane surface and/or pores. For different divalent cations (i.e. calcium and magnesium (Mg2+)), calcium showed greater flux decline than magnesium, possibly due to higher concentration of precipitated calcium species than that of precipitated magnesium species based on the pC (-log concentration) and pH diagram. © 2006 Elsevier B.V. All rights reserved.
Citation
Journal of Membrane Science, 287(1), 138-145, 2007