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A POTW (a.k.a. waste water plant) 1.0 m^3/s of treated effluent having an ultimate BOD of 30mg/L and DO = 2 mg/L into a stream that has a flow of 8 m^3/s, a BOD = 5.0 mg/L and DO = 9 mg/L. The river and waste mixture has a temperature of 20°C, a deoxygenation constant kd of 0.2 d-1, an average flow speed of 0.3 m/s, and an average depth of 3.0 m. Assume a reaeration constant of 0.6 d^-1.
a. Assuming complete and instantaneous mixing, estimate the ultimate BOD of the river just downstream from the outfall.
b. Assuming complete and instantaneous mixing, estimate the dissolved oxygen deficit just downstream from the outfall.
c. Find the time and distance downstream at which the oxygen deficit is a maximum.
d. Find the minimum value of DO.
If OA has a constant counterclockwise angular velocity of 10rad/s, calculate the angular acceleration of link AB and link BC for the position where the cordinates of A are x=-60mm and y = 80mm.
plane gate of uniform thickness holds back a depth of water. Find the minimum weight need to keep the gate closed. theta=30degrees L = 3m w = 2m
If the nuclei from the liquid were cuboids, determine the critical radius and the activation energy of solidification for Spheroidal nuclei.
The following data represents, in square meters, the cross-sectional areas along a short portion of highway. Calculate the net volume of earthworks needed or available over the portion of the highway.
The median value of the rupture strength was 300 MPa. The ceramic is to be used for components with dimensions l=50mm, b=d=5mm loaded in simple tension along their length. Calculate the tensile stress that will give a probability of failure of the..
Calculate the compression resistance of 200 UC 59.5 column which is 3.6 m high (between lateral supports). Both ends of the stanchion are held effectively in position but only one is also restrained in direction. Use grade 43 steel
If an additional 11-ft lane is added (each direction) and all other factors stay the same, what will be the new level of service?
A horizontal curve was designed for a four-lane highway for adequate SSD. Lane widths are 12 feet, and the superelevation is 0.06 and was set assuming maximum fx. If the necessary sight distance required 52 feet of lateral clearance from the roadw..
The total flow then moves to a point W on the traction drive two metres off the ground, and travels through a nine millimetre diameter conduit. Ignoring all friction and minor losses, determine the pressures at points H and W.
Briefly describe electron and hole motions in a p-n junction for forward and reverse biases; then explain how these lead to rectification.
In a certain community 36% of the families own a dog, and 22 percent of the families that own a dog also own a cat. In addition 30 percent of the families own a cat. a.) what percentage of families own both a dog and a cat
A rod of steel is 20 m long at a temperature of 200C. find the free expansion of the rod when the temperature is raised to 650C. Find the temperature stress produced
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