How do you convert mg/L to lb/day?

The conversion of milligrams per liter (mg/L) to pounds per day (lb/day) is essential for translating concentration measurements into practical application rates based on flow rates. In this case, the conversion involves recognizing the relationship between the units of measure involved.

To derive this, the conversion utilizes the fact that 1 mg/L is equal to 0.00000834 lb/gallon. Since flow rates might typically be measured in million gallons per day (mgd), this conversion factor is adjusted accordingly. Specifically, multiplying by a factor of 8.34 aligns the concentration in mg/L with flow expressed in million gallons per day, allowing for the conversion to pounds per day.

Thus, the formula provided clearly reflects the calculation: Feed rate in lb/day equals the dosage in mg/L multiplied by the flow rate in mgd, multiplied by 8.34. This factor effectively bridges the concentration and flow rate to yield a daily feed rate in pounds, essential for controlling and measuring chemical dosing in wastewater treatment processes.

Other options do not reflect the necessary conversion factor or the proper framework for unit conversion, leading to incorrect calculations in the context of determining feed rates from concentration and flow information.