Abstract
For the purpose of developing a wastewater treatment membrane bioreactor system, cross-flow microfiltration of intermittently aerated activated sludge was carried out, as a part of the solid-liquid separation process in the bioreactor. The tubular alumina microfiltration membrane, having a pore size of 0.5 μm, was submerged in the activated sludge. A cross-flow stream over the membrane surface was produced by air bubbling, generated by a diffuser situated underneath the membrane. An exponential relationship between the steady-state flux, J ss, and the causative factors such as operating parameters and fluid characteristics was found and expressed as J ss =V L =K′u ∗1.0MLSS −0.5 , where V L, K′, u ∗ and MLSS are the lift velocity, filtration constant, air-liquid two-phase flow velocity and MLSS, respectively. The relationship, as expressed by the equation, is consistent with that for conventional cross-flow filtration using a circulation pump.
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