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A wastewater treatment plant has a flow of 30 mgd. The influent BOD is 250 mg/L. Assume that 30% of the BOD is removed in the primary clarifiers. The plant is designed to carry 3,000 mg/L of VSS in the aeration basin.
A. Find the volume of the aeration basin in gallons to meet a F/M ratio of 0.25 lb BOD per lb of VSS per day (= 0.25 d-1).
B. What is the wasteage rate in lb/d to meet a mean cell residence time
The wheel of radius r rolls without slipping and has an angular velocity w. Write an expression for the velocity of point A in terms of theta and show that the velocities of A and B are perpendicular to one another
What does under-reinforced mean Which is desirable and why How would your Moment-Curvature plot be affected if the amount of tension steel was doubled How would your Moment-Curvature plot from part a be affected if compression steel was added to the..
the wind reaches a speed of 27.8 m/s in a storm. calculate the force acting on a 1m x 2m window facing the storm. the window is in a high-rise building. the air density p= 1.2 kg/m3.
A channel of a rectangular section is to take a certain discharge Q at critical flow; prove that for the wetted perimeter, P=b+2y to be minimum, the water depth must be three-quarters of the width
A hollow circular, gray cast-iron pipe supports a red brass rod and weight W = 2 kips, as shown. The outside diameter of the pipe is d = 6". If the allowable compressive stress in the pipe is 5000 psi and the allowable shortening of the pipe is 0...
The point of intersection of the tangents is located at station (948+67.32). If the design speed of the highway is 60mi/h, determine both the point of tangent and the deflection angles to whole stations for laying out the curve. Select appropriate..
The PVC pipe weighs 36.1 pounds per foot of length. Determine the minimum uniform thickness (in) of concrete (150 lbs/ft^3) required around the exterior of the PVC pipe to prevent the empty pipe from floating.
Working a problem where there are two one-story buildings of different heights next to each other. Earthquake imparts a base motion z(t) that is a cosine function. I'm given a shape function for a column of height L when deriving the EOM for each ..
A MSW landfill is being designed to handle solid waste generated by Binford at a rate of 50 Mg/d. It is expected that the waste will be delivered by compactor truck on a 5d/week basis.
Air (an ideal gas) enters an adiabatic nozzle at 3 bar and 38 C and exits at 1 bar and -0.78 C. The process is steady. If the velocity at the inlet is 1 m/s, determine the exit velocity and the ratio of the exit area to the inlet area.
All stormwater will drain as sheet flow to the center, flow into a drop inlet, and travel through a pipe system to the nearest stream. The parking lot will be mowed grass (clay soil) with a slope of 2 percent toward the center.
A gray silty clay (CL) is sampled from a depth of 12.5 feet. The "moist" soil was extruded ffrom a 6-inch high brass liner with an inside diameter of 2.83 inches and weighed 777 grams.
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