Engineering, 06.05.2020 04:42 ranaaf
A wastewater plant discharges a treated effluent (w) with a flow rate of 1.1 m3/s, 50 mg/L BOD5 and 2 mg/L DO into a river (s) with a flow rate of 8.7 m3/s, 6 mg/L BOD5 and 8.3 mg/L DO. Both streams are at 20 oC. After mixing, the river is 3 meters deep and flowing at a velocity of 0.50 m/s. DOsat for this river is 9.0 mg/L. The deoxygenation constant is kd= 0.20 d-1 and The reaction rate constant k at 20 °C is 0.27 d-1. a) Find the initial DO deficit (D0) after mixing, (units:
Answers: 1
Engineering, 04.07.2019 18:10, wirchakethan23
Hydraulic fluid with a sg. of 0.78 is flowing through a 1.5 in. i. d. pipe at 58 gal/min. the fluid has an absolute viscosity of 11.8 x 105 lbf-sec/ft2. is the flow laminar, turbulent or within the critical range? give both a numerical reynolds number and a term answer.
Answers: 3
Engineering, 04.07.2019 18:20, samantha636
Avolume of 2.65 m3 of air in a rigid, insulated container fitted with a paddle wheel is initially at 264 k, 5.6 bar. the air receives 432 kj by work from the paddle wheel. assuming the ideal gas model with cv = 0.71 kj/kg • k, determine for the air the amount of entropy produced, in kj/k
Answers: 2
A wastewater plant discharges a treated effluent (w) with a flow rate of 1.1 m3/s, 50 mg/L BOD5 and...