Coagulant Dosing Calculator
Calculate alum, ferric chloride, or PACl feed rates from jar test results. Estimate alkalinity consumption and sludge production.
Inputs
MGD
NTU
mg/L
mg/L
Results
Coagulant Feed Rate
1,251 lbs/day
Liquid Feed Rate
235 gpd
CoagulantAluminum Sulfate (Alum)
Polymer Feed Rate8.34 lbs/day
Alkalinity Consumed13.2 mg/L as CaCO₃
Sludge Production551 lbs/day
Annual Chemical Cost$62,404
Cost per Million Gallons$34.19
30-Day Storage (liquid)7,049 gallons
Rapid Mix Volume1,736 gallons
Flocculation Volume86,806 gallons
P H Drop0.26
Thirty Day Supply (lbs)37,530
How to Use This Calculator
- Enter Plant Flow Rate (MGD) and Raw Water Turbidity (NTU) from your source water monitoring.
- Select Coagulant Type (alum, ferric chloride, PACl) based on your chemical supply agreement.
- Enter Optimal Dose (mg/L) from jar test results — adjust seasonally as source water quality changes.
- Add Polymer Dose (mg/L) if your plant uses a coagulant aid or filter aid polymer.
- Review Coagulant Feed Rate (lbs/day) and Liquid Feed Rate (gpd) to set pump outputs and verify chemical tank sizing.
- Check Alkali Consumption to determine if pH adjustment is needed to maintain coagulation efficiency.
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