Removal of humic substances (HS) from water by electro-microfiltration (EMF)

Water Research
Yu-Hsiang WengC P Huang

Abstract

Humic substances (HS) represent the common agents contributing to flux decline during membrane filtration of natural water. In order to minimize the fouling during microfiltration (MF) of HS, modifying the operation of MF presents a promising alternative. A laboratory-scale electro-microfiltration (EMF) module was used to separate Aldrich HS from water by applying a voltage across the membrane. The presence of an electric field significantly reduced the flux decline. A flux comparable to that of ion-free water was attained when the voltage was near the critical electric field strength (Ecritical), i.e., the electrical field gradient that balances the advective and electrophoretic velocities of solute. At an applied voltage of 100 V (approximately 110 V/cm), it was able to reduce UV absorbance at 254 nm (UV254), total organic carbon (TOC) and trihalomethane formation potential (THMFP) by over 50% in the permeate. Results from 1H nuclear magnetic resonance (1H NMR) analysis suggest that the aromatic and functionalized aliphatic fractions decreased significantly in the permeate. The charged HS have large molecule weight compared with those passing through membrane. Results clearly indicate that a combination of electric force with...Continue Reading

References

Jul 9, 2002·Environmental Science & Technology·Andrea I SchäferAnthony G Fane
Jan 18, 2003·Water Research·Gordon C C YangShiou-Huei Tsai
Jun 10, 2005·Journal of Hazardous Materials·Yu-Hsiang WengC P Huang

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Citations

May 22, 2010·Journal of Hazardous Materials·Ritu D Ambashta, Mika Sillanpää
Dec 20, 2020·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Cunshi WangJianzhong Zhu
Sep 30, 2010·Environmental Science & Technology·Yu-Ting TsaiKung-Cheh Li

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