Examine the changes in the parameters asked by changing the sludge age of the AC system that will purify the

wastewater whose characterization is given below, within the range of $Qx=4-20$ days.

a$)$ Calculate the change of net conversion rate $($YNH$)$ with sludge age $($Qx$)$ and draw its graph.

b$)$ Calculate and draw the graph of the change in effluent dissolved decomposable COD, $S,$ and $S_1=S+S_1$

concentrations with sludge age $(Qx).$

c$)$ For unit wastewater flow rate, calculate the three components of sludge production separately and in total with the sludge age $(Qx.$

Calculate the change and draw its graph. $($PxT$=$PXH$+$PXE$+$PXI$)$ d$)$ For

unit wastewater flow rate, sludge age $(Qx)$ of the sludge mass $($three components and total$)$ kept in the reactor

Calculate the change with and draw its graph. $Mx=Px.Qx$

e$)$ Calculate and draw the graph of the change of the active fraction of the sludge, PxH$/$ Pxt$,$ with the sludge

age $(Qx).$

f$)$ For unit wastewater flow rate, calculate the change of Oi with sludge age $($Qx$)$ and draw its

graph. Interpret the results.

$=3$ days ${?}^1,Ks=40m\frac{g}{C}OD,YH=0\mathrm{.}45g$ UACM $\frac{?}{\text{g}\text{C}\text{O}\text{D}},bH=0\mathrm{.}15$ days ${?}^{-1},fE=0\mathrm{.}2$

Total COD$=500m\frac{g}{l},Sn=30m\frac{g}{1}1=70m\frac{g}{l}$