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http://dx.doi.org/10.5762/KAIS.2018.19.8.105

Membrane fouling reduction using electro-coagulation aided membrane bio-reactor  

Kim, Wan-Kyu (Department of Convergence Technology for Safety and Environment, Hoseo University)
Hong, Sung-Jun (Department of Nanobiotronics, Hoseo University)
Chang, In-Soung (Department of Environmental Engineering, Hoseo University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.19, no.8, 2018 , pp. 105-114 More about this Journal
Abstract
Membrane fouling in EC-MBR (Electro-Coagulation aided Membrane Bio-Reactor) processes was evaluated according to the operating parameters, such as current density and contact time. In addition, the fouling mechanism was investigated. Compared to the control (i.e., no electro-coagulation), membrane fouling for filtration of the activated sludge suspension after electro-coagulation was reduced significantly. Membrane fouling was improved further when the contact time was doubled under a low current density of $2.5A/m^2$. On the other hand, membrane fouling was not mitigated further, as expected, even though the contact time was doubled from 12 to 24 hr. at a current density of $10A/m^2$. This indicates that the overall decrease in membrane fouling is a function of the product of the current density and contact time. The particle size of the activated sludge flocs after electro-coagulation was changed slightly, which means that the membrane fouling reduction was not attributed to a larger particle size resulting from electro-coagulation. The experimental confirmed that the dynamic membrane made from aluminum hydroxide, Al(OH)3, and/or aluminum phosphate, Al(PO4), which had been formed during the electro-coagulation, played a key role on the reduction of membrane fouling. The dynamic membrane prevents the particles in the feed solution from deposition to the membrane pores and cake layers. Dynamic membrane formation as a result of electro-coagulation plays a critical role in the mitigation of membrane fouling in EC-MBR.
Keywords
Membrane bioreactor; Electro-coagulation; Membrane fouling; Modeling; Metal hydroxide;
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