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A 14 mgd wastewater treatment plant has a primary clarifier that treats an influent with 800...

A 14 mgd wastewater treatment plant has a primary clarifier that treats an influent with 800 mg/L of solids and a removal efficiency of 55%. Sludge at the bottom of the tank is pumped at a rate of 0.1 mgd.

a. What is the effluent solids concentration from the clarifier (in mg/L)?

b. What is the solids concentration in the sludge at the bottom of the tank (in mg/Land %)?

c. The primary sludge is further processed in a digester following treatment. What weight of solids (in lbs) need to be handled each week in the waste sludge?

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