Pond Water Reverse Osmosis

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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 using Reverse Osmosis
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Pond Water Source
Pond System
Gypsum Stacks
Phosphoric Acid Plant
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Phosphoric Acid ProcessOrigin of Pond Water
Fresh Water
Rain
Phosphoric Acid
Gypsum Slurry
Phosphate Rock
Phosphoric Acid Plant
Gypsum Stack
Other Water
Sulfuric Acid
Water From Stack
Pond Water
Pond System
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Typical Pond Water
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Traditional TreatmentDouble Liming

• Lime Slurry Addition to pH 5.5
• Settling and Sludge Separation
• 2nd Lime Addition to pH 12-12.5
• Settling and Sludge Separation
• Air Stripping for NH3 Removal
• Sulfuric Acid Addition to pH 8

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Double LimingLimitations

• 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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Cost EstimateDouble Liming