Question

A 12" diameter rigid conduit returns RAS back from the secondary tank to the PE channel. The length of conduit is approximately 2500 feet. With the RAS flow at 0.1 MGD and the pipe is assumed full all time, what is the estimated detention time (travel time) for the RAS to circulate from the secondary process to the PE. 3.5 hours 6.1 hours 3.9 hours 7 hours

Answer 1

1 mgda 0.0438 18 m3/8 Ifta 03048 m. 1 ft = 12 inch 80 flow Rate = O. IMGPX 0.043818 m3 IMED 9- 0.0043818 m3 8 Area = 02 DE 12 inch 0.3048 m 80 A= (030418m)= 0.07297 m2 80 velocity = 9 A 0.0043818 m3)s 0.07297 m² va 0.06 m/s 2 - length of pipe = 2x length of Conduit (to secondary) 152um La 2x2500 x 0.3048 m 1 ft so time = Length 1524 m relocity 25378 AX hr 0.06m 36008 - t = 7 br