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• W2038961538 abstract "High-energy demand presents a major obstacle in the application of advanced water-purification systems. In this work, energy minimization and fouling mitigation by iron-based electroflocculation in dead-end microfiltration were investigated. Highly pure water contaminated with Silica-CMP (chemical mechanical polishing) particles were pretreated by electroflocculation at short operation times and a constant electrical current intensity of 0.4 A, followed by different slow-mixing times and filtration without any sedimentation step. By using a new method for filtration-energy appraisal, we found that an over 90% reduction in filtration energy could be achieved. The improvement was observed at all pH values examined (pH 6–8); pH values below 7 were problematic because the permeate turned yellow as a result of residual iron. The appearance of residual iron was explained by the dependence of Fe2+ to Fe3+ reaction rates on pH. Scanning electron micrographs of the fouled membrane surface showed the important role played by the sweep-coagulation mechanism in mitigating fouling. When internal fouling was the dominant mechanism, the amorphous iron-hydroxide solids formed a layer that filtered out the primary particles, protecting the membrane pores from plugging. Iron-hydroxide particles also reduced the hydraulic resistance of the cake when the external fouling mechanism dominated. Significant energy reduction was observed, even without the slow-mixing step, as a result of the local flocculation conditions near the membrane surface. Additional energy savings were obtained due to the significantly higher initial-flux restoration rates (>90%) resulting from electroflocculation pretreatment." @default.
• W2038961538 created "2016-06-24" @default.
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• W2038961538 date "2010-07-01" @default.
• W2038961538 modified "2023-09-26" @default.
• W2038961538 title "Fouling mitigation by iron-based electroflocculation in microfiltration: Mechanisms and energy minimization" @default.
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• W2038961538 doi "https://doi.org/10.1016/j.watres.2010.05.002" @default.
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