Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Responsive to fluid flow
Patent
1976-07-06
1977-04-12
Spear, Jr., Frank A.
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Responsive to fluid flow
210 45, 210 48, 210 52, 210 60, 210 61, 210 67, 210 73R, 423164, 423165, 423175, 423432, C02B 122
Patent
active
040173917
ABSTRACT:
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 froth flotation procedures to recover a quality lime 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 disposal of environmental contaminating chemical flocculants such as alum.
REFERENCES:
patent: 2359748 (1944-10-01), Clemens
patent: 2390095 (1945-12-01), Gloss
patent: 2581719 (1952-01-01), Schoenlaub
patent: 3262877 (1966-07-01), Le Compte
Mulbarger et al.; "Lime Clarification, Recovery, Reuse and Sludge Dewatering Characteristics"; Journal W.P.C.F. vol. 41, No. 12, (Dec. 1969), pp. 2070-2085.
LeCompte A. R.; "Water Reclamaton by Excess Lime Treatment Of Effluent"; TAPPI vol. 49, No. 12, (Dec. 1966), pp. 121-124.
Doerner et al.; "The Bicarbonate Process For The Production of Magnesium Oxide"; Technical Paper No. 684, Bureau of Mines.
Baldwin George H.
Castel Benoit
Spear, Jr. Frank A.
Yeager Arthur G.
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