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Magachlor is present in a lake having a volume of 20,000,000m3 that is used for drinking water. This waterbody can be considered well mixed. Megachlor can beconsidered a conservitive pollutant. The currentconcentration of megachlor in the lake, is 0.004 mg/L. Flowto the lake consists of one large river flow of 80,000m3/d and flow from two treatment plants equals10,000m3/d. There is no measurable megachlor inthe iver but megachlor is present in the two treatment planteffluents. Curent megachlor fluxes to the lake from eachtreatment palnt equals 0.5 kg/day. New treatment technologiesare being installed at the treatment plants that will completlyremove megachlor from these industrial treatment plant effluentsbut these technologies will not be on-line until one year fromnow.
(a) Set up the complete mass ballance for concentratingmegachlor concentration in the lake
(b) Calculate the hydraulic residence time f the lake
(c) Estimate the megachlor concentration in the lake in oneyear (when the treatment plants come on-line).
(d) What will the concentration of megachlor be in four years?
Assume the actual water temperature for calibrating a 1/3 ft3 measure was 65 degrees F. If you had used a water temperature of 75 degrees F for your calibration, how much error would there be in your volume calculation (both in ft3 and as a percen..
Measurements indicate that to cause this flow the force acting on the contents of the control volume is 40i lb. Determine the net rate of flow of linear momentum through the control surface.
The 30-Mg freight car A and 15-Mg freight car B are moving toward each other with the velocities VA= 20 km/h to the right and VB= 10 km/h to the left. the spring constant on car A is k= 3MN/m.
The bottom of piezometers A and B are on the same flow line and 1000 m apart. The bottom of piezometer A is at 130 m and its water level is 160 m. The bottom of piezometer B is at 100 m and the water level is 150 m.
calculate the critical depth of a circular concrete pipe with a diameter of 42 inches, a Manning's Number of .014, a slope of .025% and a flow rate of 10 CFS (cubic feet per second). The radius is 3.55 and normal depth is 25 inches
How much extra water does a 21.5 ft, 175-lb concrete can one displace compared to an ultra-lightweight 38-lb Kevlar canoe of the same size carrying the same load
A completely mixed retention basin is used to treat an industrial waste water consisting of a non-conservative pollutant, using a reaction that destroys the pollutant according to first-order reaction kinetics, with k = 0.216/day.
The specimens cured at 150oC had an average shear strength of 620 psi, with a standard deviation of 20 psi. Those cured at 130oC had an average shear strength of 750 psi, with a standard deviation of 30 psi.
A rigid tank contains 40 lbm of air in 20 psia and 70 degrees F. More air is added to the tank untill the pressure and temperature rise to 35 psia and 90 degrees F, respectively.
Use A992 steel (Fy=50ksi). In the plane perpendicular to the frame, the system is braced with supports at the top and bottom. Use stiffness reduction factor τ to determine effective length k
The force F is acting on the boom ABC at C points in the direction of the unit vector 0.7071i-0.7071j and its magnitude is 10kN. The boom is supported by a ball and socket at A and cables BD and BE.
An uncatalyzed reaction has a rate of 4.2 x 10-7 sec-1. When an enzyme is added the rate is 3.2 x 104 sec-1. Calculate the rate enhancement caused by the enzyme.
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