期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 280, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2021.119823
关键词
Electromagnetic field; Reverse osmosis; Fouling and scaling; Magnetohydrodynamic effect; Hydration effect; Brackish water desalination
资金
- Bureau of Reclamation Agreement [R18AC00118]
The study found that EMF was effective in controlling membrane scaling in RO systems, improving system performance under typical operating conditions. It significantly reduced membrane scaling, changed the nature of formed scales, and decreased the rate of decline in water permeability. Additionally, EMF treatment effectively removed pre-formed scales in pipelines and tanks, but had limited efficacy on pre-formed scales on RO membranes.
This study investigated the effectiveness and mechanisms of electromagnetic field (EMF) on reverse osmosis (RO) membrane scaling control during brackish groundwater desalination. Pilot-scale experiments were conducted with different types of groundwater and two configurations of RO skid operated each for 30 days and 55 days without any other pretreatment. The testing results demonstrated EMF was effective for scaling control under typical RO operating conditions. The EMF significantly enhanced the performance of the RO system by reducing membrane scaling, changing the nature of the formed scales, and decreasing the decline rate of the normalized water permeability. In addition, EMF treatment effectively removed the pre-formed scales and precipitates in water pipelines and tanks but had limited efficacy on removing the pre-formed scales on the RO membranes. Membrane autopsy showed that the scales formed on the membrane surface under the influence of EMF were soft and powdery, being easily removed by water rinsing. The mechanisms of the EMF on RO membrane were discussed, and the dominant mechanism was the magnetohydrodynamic effect. This is the first study that demonstrated the EMF as a chemical-free and effective alternative to control membrane scaling and maintain RO performance during brackish groundwater desalination with discussions on detailed mechanisms and perspectives.
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