Journal
CHEMOSPHERE
Volume 295, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2022.133939
Keywords
Membrane fouling; Monovalent cations; Discrepant effect; Anionic polyacrylamide; Hydration force
Categories
Funding
- National Natural Science Foundation of China [52000014, 52000017]
- Natural Science Foundation of Chongqing Science & Technology Commission [cstc2020jcyj-msxmX0824]
- Science and Technology Research Program of Chongqing Municipal Education Commission [KJQN202000825]
- Innovation Group of New Technologies for Industrial Pollution Control of Chongqing Education Commission [CXQT19023]
- Project of Chemical Engineering and Technology Team [ZDPTTD201915]
Ask authors/readers for more resources
This study investigates the effects of Na+ and K+ on APAM-based membrane fouling and reveals the mechanisms behind the fouling. The research finds that an increase in the ionic strength of Na+ and K+ exacerbates the reduction of relative flux and the accumulation of fouling resistance, while also causing the fouling layer to become denser. Furthermore, K+ has a stronger effect on membrane fouling compared to Na+.
Understanding how ionic conditions affect membrane fouling induced by anionic polyacrylamide (APAM) is important for achieving long-term and stable operation of a polymer flooding produced wastewater (PFPW) membrane separation process. However, there is lack of studies on the effects of monovalent cations (Na+ and K+) on APAM-based membrane fouling. In this work, the effects of Na+ and K+ on filtration efficiency, flux decline behavior, fouling resistance, and cleaning efficiency were studied through a series of microfiltration tests. Moreover, the influencing mechanism of membrane fouling was further comprehensively revealed from the aspects of the extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory, the hydration force, and the microstructure characterizations. The XDLVO theory agreed well with membrane fouling behavior at various ionic strengths. The increase in ionic strength (0-10,000 mg/L) of Na+ and K+ exacerbated the reduction of relative flux (J/J(0)) and the accumulation of fouling resistance, as well as made the porous APAM-induced fouling layer denser and more compact, boosting removal efficiency. Furthermore, K+ had a stronger aggravating effect on membrane fouling than Na+. Specifically, the final value of J/J(0) for APAM(+)K(+) (0.08) was lower than that for APAM + Na+ (0.12), and the fouling resistance for APAM(+)K(+) (12.25 x 10(11) m(-1)) was higher than that for APAM + Na+ (12.01 x 10(11) m(-1)) at an ionic strength of 10,000 mg/L, which was owing to the larger hydration force caused by Na+ with a smaller ionic radius. This research offers practical guidance for the PFPW membrane filtering process.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available