1. An activated sludge plant is to be designed for a population of 4000 persons. The influent flow is 380 Lpcd and the influent BOD5 is 200 mg/L. Pertinent data are: Primary clarifier removes 33% of the influent BOD5, and the state regulatory agency allows a volumetric loading of 0.48 kg BOD5 /(m3.day). Determine the reactor basin volume.
2.An airplane approaches a stationary aircraft carrier at a speed of 300ft/s. The deceleration of the plane on the carrier is proportional to the speed a=-0.5v. Find the minimum length of runway required for the landing . Find the position on the runway where the speed is 50ft/s and the time it takes for the speed to reach 50ft/s