Experimental study of adhesion properties between membrane surface and humic acid during microfiltration

To further unravel the humic acid (HA) fouling mechanism during microfiltration under different conditions, such as pH, ionic strength, the concentration of calcium ions, atomic force microscopy (AFM) combined with self-made PVDF colloidal probe was applied to determine the relationship between the...

Full description

Saved in:
Bibliographic Details
Published inHuanjing kexue Vol. 35; no. 8; p. 3007
Main Authors Wang, Lei, Huang, Dan-Xi, Wang, Xu-Dong
Format Journal Article
LanguageChinese
Published China 01.08.2014
Subjects
Adhesiveness
Calcium - chemistry
Humic Substances
Hydrogen-Ion Concentration
Ions
Membranes, Artificial
Microscopy, Atomic Force
Ultrafiltration - methods
Online AccessGet more information

Cover

More Information
Summary:To further unravel the humic acid (HA) fouling mechanism during microfiltration under different conditions, such as pH, ionic strength, the concentration of calcium ions, atomic force microscopy (AFM) combined with self-made PVDF colloidal probe was applied to determine the relationship between the adhesion forces of membrane-HA or HA-HA and the flux decline of membrane. The results indicate adhesion forces were the main reason of membrane fouling. With the decrease of pH or increase of the ionic strength, due to the electrical neutralization caused by pH and electrical shielding effect of ionic strength, the adhesion forces of membrane-HA and HA-HA increased. Because of the comprehensive effect of "salt bridge" and electrical neutralization, there was a transition from increase to decrease for the adhesion forces of membrane-HA and HA-HA as the doses of calcium ions increased. In all cases, both of membrane-HA and HA-HA adhesion forces had the same variation tendency, which displayed a good correlation with
ISSN:0250-3301
DOI:10.13227/j.hjkx.2014.08.024