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A stack emitting 80 g/s of NO has an effective stack height of 100 m. The wind speed is 4 m/s at 10 m, it is located in an urban area, and it is a clear summer day with the sun nearly overhead. Estimate the ground level NO concentration
a) Directly downwind at a distance of 2 km.
b) At the point downwind where NO is a maximum.
c) At a point located 2 km downwind and 0.1 km off the downwind axis
A perfectly mixed aeration pond with no recycle (return line) serves as the biological reactor for a small community. The pond receives 30 cubic meters/day of influent with a BOD5 of 350 mg/L that must be reduced to 20 mg/L before discharge.
Find the maximum production rate of B in moles per minute and the optimum for (a) a plug flow reactor (b) a mixed flow reactor Find the production rate of B in moles per minute for (c) a mixed flow reactor with V = 100 m3
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
John Adams has a $65,000 adjustable gross income from Apple Corp. and allowable itemized deductions of $7200. Mary Eve has a $75,000 adjustable gross income and $2000 of allowable itemized deductions.
Assume that the upstream pressure is 60 psi and that the flow is isothermal at 68F, determine the maximum possible mass flow rate of air for which the assumption of incompressible flow is a vaild engineering approximation.
Three pipes in a parallelsystem run between points A & B on a water distribution network delivering 400L/s. Pipe 1 is a 350 mm PVC main 4000 m long, Pipe 2 is a concrete pipe 250 m long and 80 mm in diameter
Compute and tabulate the deflection angles and chords necessary to stake out this spiral at full sections. Given Ts = 1304.60 ft.A spiral 400 ft length is used for transition into a3o00' circular curve (arc deflection). Angle I at the PI station 50+0..
hree wells are drilled in an unconfined aquifer with the following coordinates and observed heads: Well 1: 0,200 (meters) 50 (meters) Well 2: 240,130 54 Well 3: 140, 320 63 (a) Find the magnitude and direction of the hydraulic gradient.
The design parameters are: • Q = 65 m3/d, • Wetland area (A) = 0.23 hectares (2,300 m2) (including the safety factor), • Aspect ratio = 8:1 • Average water depth (d) = 0.5 m • Bed slope = 1% (0.01 m/m) Given that the Manning's resistance factor
The floating platform is supported at each corner by a hollow sealed cylinder 1 m in diameter. The platform itself weights 30kN is air, and each cylinder weighs 1.0kN/meter of length. What total cylinder length L
What is the maximum length of trench that can be excavated by hand economically rather than by a trenching machine. It will cost $900.00 to transport a trenching machine to the job and back to the storage yard.
A tangent section of highway has a -1.0 % grade and ends at station 0+145 and elevation 25m. it must be connected to another section of highway that has a -1.0 % grade and that begins at station 1+345 and elevation
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