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The Donnan membrane process (DMP) was applied for recovery of alum from water treatment plant residuals or sludge. Alum is widely used as a coagulant in drinking water treatment plants for efficient removals of suspended solids and colloidal particles. The application was studied for two different types of membrane viz. the homogeneous Nafion 117 membrane and the heterogeneous Ionac 3470 membrane...
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