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The town of Columbia discharges 17,360 m3/d of treated wastewater into the Broad River. The treated wastewater has a BOD of 12 mg/L and a k of 0.0338 1/d. The Broad River has a flow rate of 0.43 m3/s and an ultimate BOD of 5.0 mg/L. The DO of the river is 6.5 mg/L and the DO of the wastewater is 1.0 mg/L. Compute the DO and initial ultimate BOD after mixing
A horizontal cylindrical tank 4 ft in diameter and 10 ft long is full of water. Find the work done in pumping the water to a point 4 above the top of the tank.
An equal-tangent sag curve has its PVI at station 10+00 and elevation at 138 ft. Directly above the PVI the bottom of an overpass structure is at elevation 162 ft. The PVC is at station 4+00. If the initial grade is -4.0%
Find the time for one complete cycle of this motion if the spring constant is 21 N/m. (Assume that once the pendulum ball hits the spring there is no effect due to the vertical movement of the ball.)
Air can be assumed as a di-atomic ideal gas. Find the final temperature and the amount of work ( in kW) required for air compression at a rate of 100 mol/s , from an initial condition of 1 bar an 25 C to 10 bar; for the following ways.
Determine the compositions and quantities of gas and liquid when 1 lb mole of a mixture of 30 mole percent methane and 70 mole percent ethanol is brought to equilibrium at 0 F and 500 psia.
A cylindrical tank with inside diameter of 300mm and wall thickness of 5mm is subjected to an internal pressure of 2Mpa. The tensile stress in mpa in the wall of the tank is mostly near
An eighteen inch diameter sandstone column is subjected to an axial compressive force of 2x10^6 lb / ft. Find the factor of safety based on the ultimate compressive force. For the ultimate compressive stress of sandstone=85Mpa.
Also calculate the deflection of the beam to check that it complies with the design limit of L/200. Only variable actions are required for deflection check.
A stratified lake could be idealized as two layers: with 7.0 m of fresh water on top and 10.0 m of cold water (specific gravity = 1.02) on the bottom. What are the pressure heads at the interface and at the bottom of the lake, in terms of water col..
You have been asked to estimate the optimal size of a small reservoir that is being constructed near Atlanta. Knowing that water is a scarce commodity, you have decided to adopt an "economists" perspective on this problem
A barge measures 10 ft (depth) by 35 ft by 120 ft and weighs 100 U.S. tons. The barge floats in fresh water (specific weight = 62.4 lb/ft3) and is evenly filled with 38,000 bushels of corn (60 lb/bushel).
When Eurasia restaurant, serving Eurasian cuisine, first opened along Chicago's Michigan Avenue, its novelty brought many diners.
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