Calculate mg/L from lb/day and daily flow, or solve for mass loading or flow using MGD, gallons, liters, cubic meters, kilograms, and exact or 8.34 factors.
lb/day To mg/L Formula
The following formula calculates concentration from mass loading in lb/day and matching daily volume in US gallons/day. A mass load alone cannot determine mg/L.
Variables:
- C is the concentration in mg/L
- FR is the mass loading in lb/day
- FV is the daily volume in US gallons/day
Multiply the lb/day loading by 453592.37 mg/lb, then divide by the daily volume multiplied by 3.785411784 L per US gallon. Equivalently, mg/L = lb/day / (MGD × 8.345404452019…). The optional 8.34 operator convention is rounded and produces a slightly different result. Use matching load and flow periods.
| Flow (MGD) | Concentration (mg/L) | Mass (lb/day) |
|---|---|---|
| 1.0 | 0.1 | 0.835 |
| 1.0 | 0.25 | 2.086 |
| 1.0 | 0.5 | 4.173 |
| 1.0 | 1 | 8.345 |
| 1.0 | 1.5 | 12.518 |
| 1.0 | 2 | 16.691 |
| 1.0 | 3 | 25.036 |
| 1.0 | 5 | 41.727 |
| 1.0 | 7.5 | 62.591 |
| 1.0 | 10 | 83.454 |
| 1.0 | 12.5 | 104.318 |
| 1.0 | 15 | 125.181 |
| 1.0 | 20 | 166.908 |
| 1.0 | 25 | 208.635 |
| 1.0 | 30 | 250.362 |
| 1.0 | 40 | 333.816 |
| 1.0 | 50 | 417.270 |
| 1.0 | 75 | 625.905 |
| 1.0 | 100 | 834.540 |
| 1.0 | 150 | 1,251.811 |
| * Rounded to 3 decimals. Uses lb/day = mg/L × MGD × 8.345404. 1 MGD = 1,000,000 gal/day. | ||
What is lb/day To mg/L?
The lb/day to mg/L conversion is a method used to determine the concentration of a substance in a liquid. This is particularly useful in fields such as environmental engineering, wastewater treatment, and chemical processing, where it is essential to know the concentration of pollutants or chemicals in a given volume of water. The conversion allows for the calculation of the concentration in milligrams per liter (mg/L) from the flow rate in pounds per day (lb/day) and the flow volume in gallons per day (gallons/day).
How to Calculate lb/day To mg/L?
The following steps outline how to calculate the concentration in mg/L from lb/day and gallons/day.
- First, determine the flow rate in lb/day (FR).
- Next, determine the flow volume in gallons/day (FV).
- Finally, calculate C = (FR * 453592.37) / (FV * 3.785411784), using US gallons.
- After inserting the values and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
Flow rate (FR) = 100 lb/day
Flow volume (FV) = 5000 gallons/day
