$2.$ A bioreactor system treats $60,000$ m$3/$day of wastewater with a BOD$5$ concentration of

$200$ mg$/$L and a TSS concentration of $210$ mg$/$L$,$ which are typical of unclarified domestic wastewater. The average temperature is $20\backslash$deg C$.$ The discharge standards are $30$ mg$/$L

BOD$5$ and $30$ mg$/$L TSS on a maximum monthly basis $($i$.$e$.,$ typical secondary treatment$).$

Calculate the mass of MLSS in the bioreactor $($in TSS units$),$ the process solids wastage

rate $($in TSS units$),$ and the process oxygen requirements for this application. Neglect process oxygen requirements for nitrification. Justify your choice of SRT