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A factory discharges its waste into a river upstream from a lake. The discharge release rate is 2 kg formaldehyde per day. The decay is a first order process with a decay rate of 0.000005/s. The waste is discharge into the river 30 km upstream from the lake through an effective diffuser. The river flow velocity is 6 km/d. The volumetric flow rate for the river is 106 m3/d. the lake has dimensions of 4,000 m long by 600 m wide by 8 m deep. (Total Volume is 1.92 x 107 m3). There is an outlet stream from the lake with a flow rate of 106 m3/d.
1. Estimate the formaldehyde concentration in the lake using the plug flow model for the river and the completely mixed model for the lake.
A 170 kg granite rock (ρ = 2700 kg/m 3 ) is dropped into a lake. A man dives in and tries to lift the rock. Determine how much force the man needs to apply to lift it from the bottom of the lake. Do you think he can do it?
An electrostatic precipitator (ESP) is being designed to collect flue gas particles at a power plant. The following information has been collected: electric field intensity = 100,000 V/m, and average particle charge = 0.30 fC (1 fC = 10-15 C).
A. List of all possible resistance combinations that can be formed with these springs. indicate drawings and calculation of each unique configuration. B. How many unique combinations can be formed
Find the uniform flow depth (in feet) of a concrete trapezoidal channel with a bottom width of 30 ft. and side slopes of 2:1. The channel is laid at a slope of 0.05% and carries a design discharge of 1000 cfs.
At an axial load of 23 kN, a 40-mm-wide by 10-mm-thick polyimide polymer bar elongates 2.7 mm while the bar width contracts 0.17 mm. The bar is 240 mm long. At the 23-kN load, the stress in the polymer bar is less than its proportional limit.
Determine the gravitational force acting between two spheres that are touching each other. The mass of each sphere is 400 kg and the radius is 300mm.
A torque of T = 3.00 kN-m will be applied to the hollow thin-walled aluminum alloy section. If the section has a uniform thickness of 4 mm, determine the magnitude of the maximum shear stress developed in the section.
.An air turbine is used with a generator to generate electricity. Air at the turbine inlet is at 700 kPa and 25 degree C. The turbine discharges air in to the atmosphere at a temperature of 11 degree C.Inlet and outlet air velocities are 100 m/s and ..
Maintenance expenses for a bridge in west Tennessee are estimated to be $200,000 for the first eight years followed by two separate million dollar expenditures in years 12 and 18. The expected life of the bridge is thirty years.
A fine-bubble aeration basin has a flow of 21.5 mgd, an influent BOD of 180 mg/l, 31 mg/l of mmonia, and effluent of 10 mg/l. During the winter, the wastewater temperature of 14.8 degrees C does not nitrify.
Water occupies the bottom 0.8 m of a cylindrical tank.On top of the water is 0.3 m of kerosene, which is open to the atmosphere. If the temperature is 20 degrees C, what is the gage pressureat the bottom of the tank
An equal-tangent crest vertical curve is designed with a PVI at station 110+00 and a PVC at station 107+43.3. if the high point is station 110+75.5 what is the design speed of he curve?
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