What is the loading rate of a system with Q= 550GPD and BOD= 350 mg/L?

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To determine the loading rate of the system, specifically the biochemical oxygen demand (BOD) load in pounds per day, we need to use the formula:

Loading Rate (lbs/day) = (Flow Rate (GPD) x BOD (mg/L)) / 8.34

In this formula:

  • The flow rate is given as 550 gallons per day (GPD).

  • The BOD concentration is 350 mg/L.

  • The factor 8.34 is a conversion factor that translates the units from gallons and mg/L to pounds per day.

Using the given values, the calculation would be:

Loading Rate = (550 GPD x 350 mg/L) / 8.34

= (192500) / 8.34

≈ 23,086 lbs/day

However, to arrive at a more practical value, let’s focus on converting the loading directly to pounds:

First, we calculate the numerator:

550 x 350 = 192500

Next, we divide by 8.34:

192500 / 8.34 = 23050.24

To find the final loading rate in tons (which should align with common usage in wastewater treatment), we would typically use higher conversion factors or

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