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Four different high density sludge-type processes, Cominco HDS, Geco HDS, Tetra HDS Process and the Staged- neutralization process were studied for their effectiveness in treating a low strength Zn-Fe rich acidic drainage solution. Each proms was run continuously for at least two weeks after obtaining steady state conditions. The final effluent quality, lime consumption, sludge density, settleability, filterability, viscosity, neutralization potential, metal leachability, operating and capital costs were measured and evaluated for each process. |