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Evaluation of different cleaning strategies for different types of forward osmosis membrane fouling and scaling

Authors
Kim, YoungjinLi, ShengGhaffour, Noreddine
Issue Date
15-2월-2020
Publisher
ELSEVIER
Keywords
Forward osmosis; Colloidal organic and silica fouling; Membrane cleaning; Fouling control; CO2 nucleation; Air scouring
Citation
JOURNAL OF MEMBRANE SCIENCE, v.596
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF MEMBRANE SCIENCE
Volume
596
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/57652
DOI
10.1016/j.memsci.2019.117731
ISSN
0376-7388
Abstract
In this study, various cleaning methods are investigated to effectively control membrane fouling (i.e., organic fouling, colloidal fouling and scaling) in forward osmosis (FO). Simple physical cleanings (i.e., hydraulic flushing and osmotic backwashing) are firstly employed to remove membrane fouling. Both methods achieved higher than 95% efficiency and osmotic backwashing has a better efficiency for organic fouling and scaling in long-term operation, but colloidal fouling was not removed. To enhance the efficiency, intense physical cleanings (i.e., air scouring and the combination of various physical cleaning) and chemical cleanings (i.e., EDTA, low pH and high pH) were conducted but could not remove the fouling layer possibly because of the polymerization of silica colloids. Lastly, four hybrid mitigation methods (i.e., low pH DS, pulsed flow, high crossflow, and periodic sparging of CO 2 saturated solution) followed by hydraulic flushing were examined. The combination of CO2 saturated solution and hydraulic flushing completely removed the fouling layer because CO2 bubbles weakened the interaction between the fouling layer and the membrane surface. Periodic air scouring also exhibited similar effect on the fouling layer. Therefore, periodic air scouring can be more feasible option to control the silica colloidal fouling but not organic fouling.
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