engleski

Utilization of Bauxite Slag for the Purification of Industrial Waste Waters

Production of the coagulant using bauxite waste (red mud and waste base) as raw material and results of testing of this new product in laboratory ("jar" tests) and field condition (pilot plant, full scale plant) were presented. Results shoved that red mud could be used as a cheap absorber for heavy metals removal from its own waste base and other industrial waste waters after partial dissolution with diluted sulphuric acid and neutralisation with the waste base. This coagulant is especially suitable for the treatment of wastewaters generated from pressure washing of boats in the marinas. The coagulant produced from the red mud has few advantages compared to the commercial Fe and Al salts: 1. Coagulation/flocculation process could be done in one step without coagulant aid or any other chemical addition, 2. pH measurement during the purification could be avoided because of the negligible pH variations of the treated solution, 3. allow one step removal of the cationic and anionic species from the wastewater, 4. one dose of coagulant is sufficient for five repeated cycles of heavy metals removal, 5. negligible leaching of the heavy metals from the waste mud under normal environmental conditions. 6. safe for the transport, storage and handling

red mud ; waste base ; wastewaters ; coagulant ; treatment plant

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