1. A municipal wastewater treatment plant is designed for carbonaceous BOD (cBOD) removal and nitrification. The wastewater characteristics and kinetic coefficients are described in the table below. The aeration tank DO concentration is 2.0mg/L and MLVSS concentration is 2000 mg/L. The temperature is 15C. Assume that the concentration of influent NH4N that is nitrified accounts for 80% of influent TKN. Using the given wastewater and the nitrifying activated sludgecharacteristics below to calculate the following parameters as a function of SRT (i.e., derive mathematical expressions of the following parameters as a function of SRT, respectively, and show your calculation in detailed steps), and plot them as a function of SRT by varying SRT from 3 to 20 days with 1 day interval. The parameters to plot are: (a) Effluent cBOD concentration (mg/L); (b) Effluent NH4N concentration (mg/L); (c) Aeration tank volume (m3); (d) Hydraulic retention time, (hours); (e) Total solids production as kgTSS/d (assume Xe=0mg/L and VSS/TSS =0.8 ); (f) Oxygen requirement as kg/d. Wastewater characteristics Flow rate =20,000m3/d cBOD=320mg/L TKN=40mg/L Temperature =15C Kinetic coefficients of heterotrophic bacteria at 20C m=6gVSS/gVSSdKs=20mgcBOD/LY=0.4gVSS/gVSSkd=0.12gVSS/gVSSdform=1.07forKs=1.00forkd=1.04 Kinetic coefficients of nitrification at 20C