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Combined ultrafiltration and suspended pellets for lead removal

机译：结合超滤和悬浮颗粒去除铅

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摘要

A novel process combining an outside-in ultrafiltration membrane and suspended pellets in a stirred tank reactor for removing lead (Pb)from aqueous solutions was investigated.The incorporation of the membrane avoids breakthrough of fine particulate matter,which can plague conventional fluidized pellet reactors.The Pb removal efficiency increased with increasing solution pH and pellet surface area.At pH 7,increasing the total carbonate-to-lead molar ratio increased lead removal efficiency.However,increasing pH is more effective than increasing total carbonate-to-lead molar ratio for improving treatment efficiency.Using XRD,SEM and EDX,we concluded that the surface of the pellets was approximately 15% covered by Pb_3(CO_3)_2(OH)_2 at pH 9.0 after 5 days of operation with a feed containing 50 mg L~(-1)Pb.
机译：研究了一种由内而外的超滤膜和悬浮的颗粒在搅拌釜反应器中结合以从水溶液中去除铅的新方法。膜的引入避免了细颗粒物的渗透，这可以困扰常规的流化颗粒反应器。铅的去除效率随着溶液pH值和颗粒表面积的增加而增加。在pH 7时，增加碳酸盐与铅的总摩尔比会增加除铅效率。但是，增加pH值比增加碳酸盐与铅的总摩尔比更有效使用XRD，SEM和EDX，我们得出结论，在使用含50 mg L的饲料操作5天后，在pH 9.0时，颗粒表面被Pb_3（CO_3）_2（OH）_2覆盖约15％。 〜（-1）铅

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