Journal
WATER SCIENCE AND TECHNOLOGY
Volume 85, Issue 4, Pages 1079-1089Publisher
IWA PUBLISHING
DOI: 10.2166/wst.2022.016
Keywords
electric flocculation; oxidation; fouling; membrane flux; pretreatment; ultrafiltration membrane
Funding
- National Key R&D Program of China [2019YFC1803802]
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The electroflocculation/oxidation pre-treatment method can effectively reduce membrane pollution caused by natural organic matter and improve membrane permeation flux. This pre-treatment process enhances the irreversible fouling resistance of membrane pores.
In order to reduce the membrane pollution of ultrafiltration caused by natural organic matter and improve the treatment efficiency, electroflocculation/oxidation is used as the premembrane treatment method. The membrane specific flux attenuation characteristics was compared and analyzed under the conditions of direct ultrafiltration and electroflocculation/oxidation-ultrafiltration. Combined with the analysis of the reversibility of membrane fouling, the mechanism of electroflocculation/oxidation pretreatment to alleviate ultrafiltration membrane fouling was evaluated, and the membrane pore clogging model was used to fit the fouling law. The results show that, in the continuously fed filtration experiment, the electroflocculation/oxidation process involved in the pretreatment and the direct ultrafiltration membrane filtration decreased the ultrafiltration membrane flux to 79.1% and 28.5%, respectively. The reversible resistance generated by ultrafiltration and electroflocculation/oxidation-ultrafiltration processes accounted for 37.70% and 62.26% of their total pollution resistance, whereas the irreversible resistance generated accounted for 47.30% and 12.40%, respectively. Meanwhile, the direct correlation between the the flux dropped and complete clogging became less than that of the ultrafiltration process. The pretreatment significantly strengthened irreversible fouling resistance of the membrane pores. The membrane permeation flux was significantly increased after the electroflocculation/oxidation pretreatment.
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