Inorganic Flocutans in the Treatment of Milky Waste

Abstract

Attempts were made in this study to examine the flocculation process effectiveness using ferric sulphate, aluminium sulphate or polyaluminum chloride and silica, activated carbon or calcium carbonate for the treatment the Milky Factory liquid waste of Santiago de Cuba. Removal of organic matter (expressed as chemical oxygen demand, biochemical oxygen demand) and total suspended solid (TSS) during flocculation process were investigated. Also, the optimum conditions for flocculation process, such as flocculant dosage, assistant dosage, and solution pH were investigated using jar-test experiment. The results revealed that in the pH tested range the optimal operating pH was 6 for ferric sulphate, 5 for aluminium sulphate and 5-7 for polyaluminum chloride. It can be concluded the combined use of flocculant and silica, activated carbon or calcium carbonate be a useful treatment process for the liquid waste treatment of the Milky Factory.