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slu stic -2 he re 2. [18 pts] A municipal activated sludge wastewater treatment plant with primary clarification and anaerobic digestion has the following influent characteristics: Flow - 20,000 m³/d BOD, -200 mg/L @ 20°C Suspended solids - 200 mg/L The following data apply: Waste sludge flow rate 400 m'di 2500 mg/L Mixed liquor suspended solids Return sludge concentration 6000 mg/L 6000 mg/L Waste activated sludge concentration Aeration basin hydraulic residence time 10 hr Primary clarifier overflow rate 900 gal/d-ft² a) If the plant's BOD, removal efficiency is 95% and the primary clarifier removes 35% of the influent BODs, the amount of BOD, removed (kg/d) in the aeration tank is most nearly? b) Calculate the aeration basin volume (m³)? V c) Calculate Food to microorganism ratio (1/d)? F/M d) What is the mean cell residence time (days)? O e) If the MLSS is reduced to 1500 mg/L, what is the mean cell residence time (days)? f) What is the organic loading rate (kg/m²¹/d)?