3. Using the data about the active sludge treatment stage below, determine the sludge age. Suspended solids in effluent negligible Yield coefficient 0.4 %3D • bacterial decay rate = 0.04 d- • effluent BOD, = 10mg/L • BOD, after primary settling = 150 mg/L • MLVSS = 1700 mg/L • Q = 0.0796 m3/s • V=1806 m3 %3D %3D !! %3D

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