I Asked This Question Already And It Was Not Answered Right Question Question 3 Was Https Www Chegg Com Homework He 2 (40.93 KiB) Viewed 38 times
Assuming that the suspended solids in the effluent may be neglected and that wastage is from the return sludge flow, determine a) sludge age (Θc aka mean cell residence time aka solids retention time), b) cell wastage flow rate (Qw) in m3/s, and c) the return sludge flow rate (Qr~) in m3/s for the activated sludge plant described in Problem 3 above. [Hint 1: to find Θc from the information provided combined with what was calculated in Problem 3, you should use the equation for X in terms of Θc and solve for Θc. Hint 2 : You may assume mg/L MLSS ≈ 1.40∗mg/LMLVSS]
\begin{tabular}{|l|l|} \hline Primary effluent design flow (m3/s) & 0.050 \\ \hline Primary effluent BOD5(mg/L) & 218 \\ \hline Allowable 2∘ effluent BOD5 due to TSS (% of total BOD5) & 70 \\ \hline Ks(mg/L) & 60 \\ \hline kd(d−1) & 0.1 \\ \hlineμm(d−1) & 3 \\ \hline Y(mg MLVSS/mg BOD5 removed) & 0.6 \\ \hline MLVSS in aeration tank (mg/L) \\ MLSS in return sludge (mg/L) & 2990 \\ \hline \end{tabular}
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