Recycling of sludge generated from flotation as useful products
It wasconfirmed by the local authority that the sludge generated from flotation was not a chemical
waste because both alum and the polymer were used for drinking water treatment and their dosages
were applied in low concentration.Therefore,the sludge from flotation can be used as a feed or a
supplement and was nontoxic for livestock. Table2 demonstrates the protein,phosphorus and energy
levels of various animal feeds and food wastes.