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Polymer Dilution/Feed Rate Calculations

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Steve456

Civil/Environmental
Jul 8, 2022
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If a wastewater treatment plant is using 28 lbs/ton of dry polymer and 3.5 lbs/hr of polymer is the flow rate, how much water flow is needed in gpm to dilute the dry polymer down to a concentration between 0.2 - 1.0%. The percent solids are between 1-2%
 
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3.5 lbs/hr polymer / 28 lbs polymer/ton dry solids, You are processing 0.125 tons of dry solids per hour.

0.125 dry tons/hr * 2000 lbs/ton / 0.015 / 8.34 lbs/gal. You are processing about 2000gph or 33gpm of 1.5% solids.

(3.5 lbs/hr polymer / (2000ppm polymer * 8.34 lbs/gal)) * 10^6. You need about 210gph or 3.5gpm of dilution water to makedown polymer to 0.2% or 2000ppm.



JL
 
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