Coagulant Dose from Jar Test

Pure equivalent + product feed (lb/day, gal/day) for alum, ferric chloride, or PAC at the jar-test optimal dose.

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Formula and source

pure_lb_day = flow_MGD × jar_dose_mg_L × 8.34 (mass-balance constant for water). product_lb_day = pure_lb_day / (strength_pct / 100). product_gal_day = product_lb_day / (sg × 8.34).

Metcalf & Eddy (Wastewater Engineering: Treatment and Resource Recovery, 5th ed.) by name; AWWA M37 (Operational Control of Coagulation and Filtration Processes) by name. Manufacturer product-strength + density values (alum 48.5% sg 1.33, ferric chloride 38% sg 1.40, PAC 10% sg 1.20).

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