$1.$ You are using an activated sludge system to treat $15\backslash$deg C wastewater with an

influent BOD of $250$ mg$/$L to an effluent BOD of $25$ mg$/$L with $0\mathrm{.}5$ MGD

flowrate. With a diffused aeration system maintaining $2\mathrm{.}5$ mg$/$L in the aeration

basin, and rTw$,20=0\mathrm{.}32$ kg $02/$MJ $($tap water at $20$ C$).$ Assume a $=0\mathrm{.}82$ and B $=$

$0\mathrm{.}98.$ What is the power consumption in kW and CO$2$ emissions per year for this

energy demand in kg$?$

$2.$ What is the power consumption and what is the CO$,$ emissions per year if the

influent BOD increases to $400$ mg$/$L$?$

$3.$ Comment on how the strength of the influent $($BOD$)$ influences the energy

demand and COz emissions for this aeration system.