Presentation on theme: "October 17-18 2002 in Lakeland, FL Excerpts on Pond Water and Double Liming from an IMC Technology Dept Presentation: Phosphate Plant Pond Water Treatment."— Presentation transcript:
October 17-18 2002 in Lakeland, FL Excerpts on Pond Water and Double Liming from an IMC Technology Dept Presentation: Phosphate Plant Pond Water Treatment using Reverse Osmosis
Pond Water – Source Phosphoric Acid Plant Gypsum Stacks Pond System
Phosphoric Acid Process Origin of Pond Water Phosphate Rock Sulfuric Acid Phosphoric Acid Plant Pond Water Pond System Gypsum Slurry Other Water Water From Stack Rain Gypsum Stack Phosphoric Acid Fresh Water
Typical Pond Water CHEMICAL COMPONENTRANGE OF CONCENTRATION P1700-12,000 ppm SO 4 4300-9600 ppm F200-15,000 ppm Si100-4100 ppm (ammoniacal) N40-1500 ppm Na1200-2500 ppm Mg160-510 ppm Ca450-3500 ppm K80-370 ppm Fe5-350 ppm Al10-430 ppm Cl10-300 ppm
Traditional Treatment Double Liming Lime Slurry Addition to pH ~5.5 Settling and Sludge Separation 2 nd Lime Addition to pH 12-12.5 Settling and Sludge Separation Air Stripping for NH 3 Removal Sulfuric Acid Addition to pH 8
Double Liming Limitations Clear Water Recovery Only 50-60% Remaining Sludge Difficult to Dewater – Large Impoundment Ponds Precipitated Phosphate Difficult to Recover Difficulty Meeting Ammonia Limits High Cost
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