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I asked this question already and it was not answeredright.
Question:
Question 3 was:
https://www.answers.com/homework-help/que ... d=gpCIjdyU
This was the table of given values:
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}