Amunicipal wastewater treatment plant employs two circular primary clarifiers arranged in parallel, following the bar screen and grit removal chamber. the plant receives 5.0 mgd. each clarifier is center-fed 43.0 ft, and depth is 10.0 ft.

(a) what is the detention time in each clarifier?
(b) what is the hydraulic loading rate (critical velocity) in units of ft3 ft-2 hr-1? water enters at the center and exits at the perimeter.
(c) what is the weir loading rate in units of ft3 ft-1 hr-1?

The drive force for diffusion is 7 fick's first law can be used to solve the non-steady state diffusion. a)-true b)-false

Afoot bridge is made as a simple deck, 4 m long, with a cross section 2 m (wide) and 20 cm thick, and made of wood. the deck is supported at the two ends. the maximum load allowable on the bridge is 10 tons, provided it is uniformly distributed on the deck. to sense this load, a strain gauge is placed at the center of the bridge and its resistance is monitored. if the sensor has a nominal resistance of 350 s2 and a gauge factor of 3.6, what is the reading of the strain gauge at maximum load? the modulus of elasticity for the wood used in the construction is 10 gpa.

Starting wih an energy balance on a rectangular volume element, derive the one- dimensional transient heat conduction equation for a plane wall with constant thermal conductivity and no heat generation.