Relating Silica Scaling in Reverse Osmosis to Membrane Surface Properties

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We investigated the relationship between membrane surface properties and silica scaling in reverse osmosis (RO). The effects of membrane hydrophilicity, free energy for heterogeneous nucleation, and surface charge on silica scaling were examined by comparing thin-film composite polyamide membranes grafted with a variety of polymers. Results show that the rate of silica scaling was independent of both membrane hydrophilicity and free energy for heterogeneous nucleation. In contrast, membrane surface charge demonstrated a strong correlation with the extent of silica scaling (R-2 > 0.95, p < 0.001). Positively charged membranes significantly facilitated silica scaling, whereas a more negative membrane surface charge led to reduced scaling. This observation suggests that deposition of negatively charged silica species on the membrane surface plays a critical role in silica scale formation. Our findings provide fundamental insights into the mechanisms governing silica scaling in reverse osmosis and highlight the potential of membrane surface modification as a strategy to reduce silica scaling.
Publisher
AMER CHEMICAL SOC
Issue Date
2017-04
Language
English
Article Type
Article
Citation

ENVIRONMENTAL SCIENCE &amp; TECHNOLOGY, v.51, no.8, pp.4396 - 4406

ISSN
0013-936X
DOI
10.1021/acs.est.6b06411
URI
http://hdl.handle.net/10203/311090
Appears in Collection
CE-Journal Papers(저널논문)
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