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Effect of an electric field on the fouling of the hollow fiber microfiltration membrane. |
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Abstract A new type of electric hollow fiber membrane module was developed for laboratory scale research. The effect of an electric field on the fouling process of the hollow fiber microfiltration membrane was investigated in a new type of module. The transmembrane pressure(TMP) was increased from 0.0200 to 0.0300MPa during constant flow filtration of raw water containing 20mg/L humic acid. The test took 10 hours using a votage of 60V applied across the module and 2 hours when no voltage was applied. Under the condition of electrophoretic migration, the membrane fouling was minimized, because the motion of humic acid was directed away from membrane surface. Humic acid aggregated in an electric field and formed a loose cake layer on the membrane surface, which also relieved membrane fouling.
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Received: 17 June 2008
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