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An electrodialysis is used to treat a stream of 125 m3/d produced water with a salinity of 13,000 mg/L NaCl before the produced water is discharged to the river with the flow rate of 5 million L/d and salinity of 20 mg/L NaCl. The flow rate of the concentrated salt stream exiting the electrodialysis is 20 m3/d. Below the discharge point of the treated produced water is a prime sport fishing spot, and the fishes are intolerant to salt concentrations above 200 mg/L. What is the minimum removal efficiency of the electrodialysis? Assume that the density values of the concentrated salt stream and all of the untreated/ treated produced water streams are identical.
To float a 160 pound man using helium balloons (assume 0.52 cubic feet per inflated balloon). How many balloons would it take? Assume density of air is 1.29 kg/cubic meter and the density of helium is 0.179 kg/cubic meter.
three different materials designated a b and c are tested in tension using test specimens having diameters of 0.755 in.
A 40-mm-diameter jet has a velocity of 25 m/s. If this jet were to strike a large flat plate normally, what would be the resultant force on the plate?
Consider the flow of a gas between two parallel plates. If there were an increase in temperature due to heat transfer along the flow direction, the gas density would decrease. Assume the viscosity is unaffected.
The vehicle was estimated to hit the light pole at 30 mph. The skid was 650 feet long. How fast was the car traveling before applying the brakes
For an elevated storage tank , if the minimum allowable pressure = 300 kPa, Height of pipe system at low-pressure service location = 6 m, and head loss from tank to service location: average daily conditions = 11 m
Two ropes are attached to the eye bracket. The resultant force R of the two forces equals 1000-lb and the line of action is directed along the x-axis. if the magnitude of force F1 is 250-lb, determine the magnitude of force F2 and the angle
Determine the effective annual interest rate for a nominal rate of 8% per year, in which is compounded quarterly.
The evaporation rate from the surface of a 3,650-acre lake is 100 acre-ft/day. Estimate the depth change in the lake in feet during a 1-year period if the net inflow to the lake is 25 cfs. Is the depth increasing or decreasing? What is the change in ..
ACME supplies prepackaged steel framed and sheathed storage buildings in kit form. The standard column used is a steel hollow round tube with a wall thickness of 0.4 inches fixed at both ends.
When stationary, vehicles are spaced at average distance headway of 6 m. It may be assumed that there is a linear relationship between speed and density. When the traffic flow approaching the roadworks is 3500 vehicles per hour
Calculate the amount of each phase present in a 1-kg alumina refractory with composition 70 mol % Al2O3- 30 mol% SiO2 at 2,000 C , 1,900 C and 1,800 C
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