C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
23/283
C01F 11/06 (2006.01)
Patent
CA 1041736
Abstract of the Disclosure Chemical and aqueous components of sludge derived from lime treatments of raw water supplies are recovered by procedures involving carbonation of the sludges to effect a phase separation between magnesium and calcium components. When the magnesium content of the raw water is intolerable in the treated water, a magnesium carbonate is recovered from the liquid phase by its decarbonation, and the aqueous component of the liquid phase is recycled to recover the water values of the treated sludge. When the magnesium content of the raw water can be tolerated in the treated water, the liquid phase magnesium bicarbonate solution is recycled to the water treatment plant. Turbidity factors separated with the sludges remain with the insoluble calcium carbonate that is separated from the liquid phase and by avoiding conventional coagulants other than magnesium hydroxide in the treatment of the raw water, turbidity and calcium carbonate components can be separated as by conventional forth flotation procedures to recover a quality line product. Special procedures are used in the carbonation step when flue gases are used for sludge carbonation purposes so as to avoid contamination of recovered lime with magnesium values and special procedures are advocated in the treatment of soft turbid water supplies as well as high magnesium turbid water supplies to avoid the necessity of disposal of environmental contaminating chemical flocculants ? ?? as alum.
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