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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.

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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:

1 October in Lakeland, FL Excerpts on Pond Water and Double Liming from an IMC Technology Dept Presentation: Phosphate Plant Pond Water Treatment using Reverse Osmosis

2 Pond Water – Source Phosphoric Acid Plant Gypsum Stacks Pond System

3 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

4 Typical Pond Water CHEMICAL COMPONENTRANGE OF CONCENTRATION P ,000 ppm SO ppm F200-15,000 ppm Si ppm (ammoniacal) N ppm Na ppm Mg ppm Ca ppm K ppm Fe5-350 ppm Al ppm Cl ppm

5 Traditional Treatment Double Liming Lime Slurry Addition to pH ~5.5 Settling and Sludge Separation 2 nd Lime Addition to pH Settling and Sludge Separation Air Stripping for NH 3 Removal Sulfuric Acid Addition to pH 8

6 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

7 Cost Estimate Double Liming


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