4. 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%. The sludge at the bottom of the tank is removed 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/L)? C. The primary sludge is further processed in a digester following treatment. What weight of solids (in lbs) need to be handled each week? The 10.000 influent