Recovery of Alum from Surabaya Water Treatment Sludge using Electrolysis with Carbon-Silver Electrodes

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Abstract
Untreated alum sludge from Surabaya water treatment plant (WTP), which contained high concentration of alum was directly discharged into Surabaya River. It might caused problems because of the accumulation of aluminum in the lower part of the river. Alum could be recovered from the drinking water...