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Enhanced removal of bisphenol A by the cake layer in coagulation-microfiltration process |
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Abstract Using polyaluminum chloride (PAC) and ferric chloride (FeCl3) as coagulants, the removal of bisphenol A (BPA) was investigated in coagulation process of 1g/L kaolin synthetic solution. The circular cross-flow filtration method to enhance the accumulation of membrane fouling was used to evaluate the BPA removal efficiency of the cake layer. The removal efficiency of BPA with clean microfiltration (MF) cut off decreased obviously when the adsorbed BPA reached saturation in a short period of time. The cake layer which was formed by the circular membrane filtration of mixture promoted the BPA removal, and the membrane resistance in circular membrane filtration reached minimum when removal efficiency of BPA was highest in a single coagulation process. In PAC coagulation-membrane filtration experiments, BPA removal efficiency was increased 34.30% than that in single coagulation; while in FeCl3 coagulation-membrane filtration experiments, BPA removal efficiency was increased 28.38% than that in single coagulation, indicating that the formation of cake layer has promoted the BPA removal. Also, the BPA removal efficiency for the initial BPA concentration of 100μg/L was 7% higher than that for the initial BPA concentration of 5mg/L by coagulation-circular membrane filtration.
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Received: 07 May 2011
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