Test Your Knowledge – Calculating Sludge Age

Now that you have had a chance to look over Calculating Sludge Age, try these problems for some practice.

Problem #1   

The influent flow to a 2.2 MGD-facility is 1.4 MGD with an influent TSS concentration of 176 mg/L with a MLSS concentration of 1,325 mg/L. What is the sludge age of this facility in days?

Problem #2

The influent flow to a 278,000 GPD-facility is .099 MGD with an influent TSS concentration of 155 mg/L with a MLSS concentration of 1,022 mg/L. What is the sludge age of this facility in days? 

To check your answers, click here.

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