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The ceramic microfiltration system with periodic N 2 -back-flushing was operated for treating paper wastewater discharged from a company making toilet papers by recycling milk or juice cartons. Two kinds of alumina membranes with 7 channels used here for recycling paper wastewater. The optimal N 2 filtration time for HC04 membrane with 0.4μm pore size was lower value of 4min than 16min...
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