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October 17-18 2002 in Lakeland, FL Excerpts on Pond Water and Double Liming from an IMC Technology Dep’t Presentation: PowerPoint Presentation
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October 17-18 2002 in Lakeland, FL Excerpts on Pond Water and Double Liming from an IMC Technology Dep’t Presentation: Phosphate Plant Pond Water Treatment using Reverse Osmosis. Pond Water – Source. Pond System. Gypsum Stacks. Phosphoric Acid Plant.

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October 17-18 2002 in Lakeland, FL

Excerpts on Pond Water and Double Liming from an IMC Technology Dep’t Presentation:

Phosphate Plant Pond Water Treatment using Reverse Osmosis

pond water source
Pond Water – Source

Pond System

Gypsum Stacks

Phosphoric Acid Plant

phosphoric acid process origin of pond water
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

typical pond water

CHEMICAL COMPONENT

RANGE OF CONCENTRATION

P

1700-12,000 ppm

SO4

4300-9600 ppm

F

200-15,000 ppm

Si

100-4100 ppm

(ammoniacal) N

40-1500 ppm

Na

1200-2500 ppm

Mg

160-510 ppm

Ca

450-3500 ppm

K

80-370 ppm

Fe

5-350 ppm

Al

10-430 ppm

Cl

10-300 ppm

“Typical” Pond Water
traditional treatment double liming
Traditional Treatment“Double 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
double liming limitations
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