New techniques for the mine water treatment using sludge reprocessing and manipulation: dense sludge process and ettringite reuse

Experimental model and research for densification of metals and gypsum precipitates by recycling after alkaline conditioning. Studies on the decomposition of specific residues from the advancedtreatment of ARD- ettringite by reaction in acidic aq media or by reuse in the preliminary treatment phases for pH adjustment and metal
precipitation. Technological implications of saturation and desaturation with sulfates processes in the treatment of mine waters. Research on the treatment of an atypical source of mine water, having manganese as the main pollutant, specifically with high ratios Mn / Fe and the potential recovery of useful compounds. Preliminary experimental study for alternative technology for the oxidation of manganese in mine water using SO2 / air system.