A municipal wastewater treatment plant processes an average flow of 15,000 m3/d with 200 mg/L of BOD5 and 320 mg/L of suspended solids. The peak flow is 1.5 times the average flow. Determine the mass of BOD5 and solids (kg/day) that are removed as sludge from 282 Fundamentals of wastewater treatment and engineering the primary clarifier for average and peak flow conditions. Assume a reasonable efficiency for the primary clarifier and the same peak flow factor for BOD5 and suspended solids.

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

The thermal expansion or contraction of a given metal is a function of the f a)-density b)-initial temperature c)- temperature difference d)- linear coefficient of thermal expansion e)- final temperature f)- original length

You are making beer. the first step is filling the glass carboy with the liquid wort. the internal diameter of the carboy is 15 in., and you wish to fill it up to a depth of 2 ft. if your wort is drawn from the kettle using a siphon process that flows at 3 gpm, how long will it take to fill?