4. Qo S₂ x₂ Consider two- VI X₁, S₁ -stage treatment system as shown: V₂ X₂ S₂ 1 RQ, xr, S₂ Given = k₁= 0.05 day' ; K=5 day' ; Y=0.5 ; Ks= 50 mg |L Q₂ 1 = 28000 m³/day ; S₂ = 560 mglL as BOD V/₁ = 14.000 m³ ; BOD ₁ = 0.68 BOD ; kg 0₂ = 1.42 kg Cells X₁ = 10000 mg|l; S₂ = 7.5 mgll as BOD5 (in reactor 2) = 5 days; R=0.6; X₂ = 20mg|L Assuming Moned kinetics apply and steady-state operation; determine: -Qu a) x, b) S₁ c) Px₁ = excess sludge production in the first reactor d) amount of oxygen required daily in the first reactor.

D

REDMI NOTE 6 PRO MI DUAL CAMERA + て(ん- NニES5 )+2(355.94-325.5) k5/m 355mls· %3D ーュ= AV GAYI A=ー 65ラ、 %3D 2: At steady state, air at 200 kPa, 52 C and a mass flow rate of 0.5 kg/s enters an insulated duct having differing inlet and exit cross- sectional areas. At the duct exit, the pressure of the air is 100 kPa, the velocity 225 m/s and the cross sectional area is 2x10 m. Assuming the ideal gas model, determine (a) The temperature of the air at the exit in C. (b) The velocity of the air at the inlet in m/s. 2. (c)The inlet cross-sectional area in m'