The pounds formula converts a flow and concentration into a mass per day.
Pounds Formula
Formula
lb/d = Flow, MGD x Concentration, mg/L x 8.34 lb/gal
Inputs used
- Flow (MGD)
- Concentration or dose (mg/L)
Worked example (White River WRRF, fictional)
- Load = 8.0 x 220 x 8.34 = 14,678.4 lb/d
Tips
- 8.34 lb/gal is the weight of water; use specific gravity for heavier liquids.
Results are estimates for operator use. Check units and inputs, and confirm decisions with plant data and procedures.
This calculator also appears on ActivatedSludge.com, our consulting site. Results are for training and operator use; always follow your plant’s procedures.