Which equation correctly calculates solids in lb/day?

The correct equation for calculating solids in pounds per day is based on the flow rate in million gallons per day (MGD), the concentration of the solids in milligrams per liter (mg/L), and the conversion factor 8.34, which accounts for the conversion of mg/L to lb/MG (pounds per million gallons). Additionally, considering specific gravity within this context is essential when the solids' density is relative to water, as it modifies the concentration's effect on the total mass of solids present.

To break down the correct components:

• Flow (MGD): It indicates the volume of water flowing daily in million gallons.
• Concentration (mg/L): This represents the mass of solids per unit volume of water.
• 8.34: This is a conversion factor that allows conversion from mg/L to lb/1,000,000 gallons (since 8.34 lb is the weight of 1 million gallons of water). This factor is critical for ensuring that units are properly aligned so that the product will yield the result in pounds per day.

Using the equation provided effectively multiplies these components together to give a total mass of solids processed or present per day, adjusted for the concentration and flow of the