October 17-18 2002 in Lakeland, FL Excerpts on Pond Water and Double Liming from an IMC Technology...
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Transcript of October 17-18 2002 in Lakeland, FL Excerpts on Pond Water and Double Liming from an IMC Technology...
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 – SourcePond Water – Source
Phosphoric Acid Plant
Gypsum Stacks
Pond System
Phosphoric Acid ProcessPhosphoric Acid ProcessOrigin of Pond WaterOrigin of Pond Water
Phosphate Rock
Sulfuric Acid
Phosphoric AcidPlant
Pond Water
Pond System
Gypsum Slurry
Other Water Water From Stack
Rain
GypsumStack
PhosphoricAcid
Fresh Water
““Typical” Pond WaterTypical” Pond WaterCHEMICAL 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
Traditional TreatmentTraditional Treatment“Double Liming”“Double Liming”
Lime Slurry Addition to pH ~5.5Settling and Sludge Separation2nd Lime Addition to pH 12-12.5Settling and Sludge SeparationAir Stripping for NH3 Removal
Sulfuric Acid Addition to pH 8
Double LimingDouble LimingLimitationsLimitations
Clear Water Recovery Only 50-60%Remaining Sludge Difficult to Dewater
– Large Impoundment Ponds
Precipitated Phosphate Difficult to RecoverDifficulty Meeting Ammonia LimitsHigh Cost
Cost EstimateCost EstimateDouble LimingDouble Liming
$/Month $/1000 Gal. DischargedDouble Liming Double Liming
Fixed Costs
Labor/OH 65,000$ 0.97$
Maintenance/CS 141,000$ 2.11$
Laboratory 11,000$ 0.17$
Total Fixed Costs 217,000$ 3.25$
Variable Costs
Lime 750,000$ 11.22$
Caustic/Ammonia
Flocculent 42,000$ 0.63$
Sulfuric Acid
R.O. Chemicals
Electricity 52,000$ 0.78$
Total Variable Costs 844,000$ 12.62$
Total 1,061,000$ 15.87$
Credits (Rock, Acid, NH3) 3.07$ Net Cost 12.80$
Basis 2.2MM GPD Discharge Flow