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Using the following assumptions, determine the sludge age and cell wastage flow rate. Assume: Suspended solids in effluent negligible Wastage is from aeration tank Yield coefficient = 0.4 Bacterial decay rate = 0.04 1/d Effluent BOD5 = 10mg/L F/M = 0.33 mg/mg*d BOD5 after primary settling = 150mg/L MLVSS = 1700mg/L MLSS = 1.4(MLVSS) Q = 0.0796m3/s V = 1806 m3 Aeration period = 0.5 1/d
velocities in a 200-mm-diameter circular conduit, measured at radii of 0,36,64, and 87 mm were 7.0, 6.8, 6.1, and 5.0 m/s, respectively. Find the approximate values (graphically) of the volume flow rate and the mean velocity.
a) Find the free-flow speed and jam density for this relationship b) Derive equations depicting the relationship between flow and density, and speed and flow. Plot the resulting curves. Show the values of free-flow speed, jam density, and capactiy..
what is the probability that less than 0.5 inches of precipitation will occur in any January? What is the probability that more than 2.5 inches wil
A newly designed dam is to be modeled in the laboratory. The prime objective of the general model study is to determine the adequacy of the spillway design and to observe the water velocities, elevations, and pressures at critical points of the st..
If the pipe lengths ar L1 = 3000ft, L2 = 2200, and L3 = 1600 ft the respective pipe diameters are 15,10, and 18in, and the surface water elevations of two of the three reservoirs are A = 125ft and B = 55ft, find the surface water elevation of Rese..
A beryllium copper wire having diameter of 1-50 mm and length of 40mm is used as a small torsion bar in an instrument. determine what angle of twist would result in the wire when it is stressed to 250 mpa.
a circular steel tube of length L=1.2m is loaded in torsion. If the inner radius of the tube is 45 mm and the measured angle of twist between the ends is 0.4 degrees, what is the shear strain at the inner surface
Why is the ‘time value of money' important for the evaluation of engineering projects? Provide at least one practical example to support your view (max 2 pages)
A 5000 m3/day wastewater treatment plant discharges to a river with a minimum drought flow of 140 m3/min (upstream of outfall) a)What total allowable BOD (kg/day) could be discharged by the plant if the BOD in the river after initial dilution must ..
One can lease a car for $550 per month with no down payment or purchase one for $20,000 now. If the nominal interest rate is 8% per year, how many months of use necessary for the two to break even
An equal tangent vertical curve connects a -2% and a +3% grade. The low point of the curve is at elevation 297.88 ft. If the PVI is at elevation 295 ft, what is the design speed of the curve
A small chunk of the original sample had a wet weight of 140.9 grams and weighed 85.2 grams after drying. Compute the water content, using the correct number of significant figures.
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