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Develop an estimate of the volumetric flow rate of air that will be required for aeration of the mixed liquor in an activated sludge system.For this calculation, assume that the (ultimate) CBOD is 200 mg/L and (ultimate) NBOD is 50 mg/L. For purposes of this problem, assume that these two sources of oxygen demand are completely satisfied in the activated sludge system (i.e., assume that all CBOD and NBOD are completely "consumed" by the aerobic bacteria in the aeration basins). Assume an oxygen (O2) transfer efficiency of 25% from the aeration system in the aeration basins. Based on these characteristics, what volume of air will we need to pump through our aeration basins each day to satisfy this oxygen demand?
A traffic engineer is trying to design a left turn bay on an EB approach to an intersection. The signal timing for left turns will have 10 seconds of "left turn only" green time and 50 seconds of red time each signal cycle.
For a total floor load of 75 psf on 2x floor framing at 24 o.c., determine an appropriate plywood thickness and span rating assuming panels with edge support and panels oriented perpendicular to the framing. Specify the minimum fasterners and spac..
Given an 18-in. concrete conduit with a roughness coefficient of n = 0.013, s = 0.02, and a discharge capacity of 15 cfs, what diameter pipe is required to triple the capacity?
Discuss the dangers of optimization in terms of minimum section to support loads. In other words, how would optimizing for bending stresses affect the shear capacity of a section
find the net present worth of the project,and the internal rate of return ,and the annual worth of the project?
For determining the centroid of the area, two square segments are considered; square ABCD and square DEFG. What are the coordinates (x, y ) of the centroid of square DEFG?
indicate the conditons by a sketchand determine the difference in the rate of grade at the intersection of each of the following paris of slops.
A ballon is tethered at a height of 16.8 m above the ground by three cables. if the tension in highlighted cable is 60 N , determine the vertical force exerted by the balloon at the base of the balloon basket.
The total heads given by piezometers A and D are 98.9 cm and 3.6 cm, respectively. What are the total heads given by piezometers B and C?
A gas is compressed at a constant pressure of 0.800 atm from 9.00L tp 2.00L. in the process, 400J of energy leave the gas by heat. (a) What is the work done on the gas? (b) What is the change in it internal energy?
Show or formulate the shear and bending moment expressions for each board, and plot/draw the shear and bending moment diagrams of the boards.
The "sea-level adjusted" pressure at the airport was about 30.57 inches of mercury. Assuming the density of air is 1.30 kg/m3 and the gas constant for air is 287. J/(kg K), calculate the temperature of the air in Fahrenheit.
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