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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?
Estimate the effective friction angle for the sand (assume c' = 0). Calculate the sand's shear strength (τf) on a horizontal plane at depths of the 20 ft and 50 ft.
Using 1630.56 kN as the ultimate capacity determine the diameter of a drilled shaft pile that would have the same ultimate capacity and depth embedment (11.5 m) using the FHWA method. Neglect shaft resistance. Use a F.S. of 2
Determine the strain components strainx, Strainy, and gammaxy, then sketch the deformed shape in the xy orientation, paying particular attention to the sign of the shear deformation.
Also, at the failure cross sections the diameters are found to be 0.731 in., 0.645 in., and 0.587 in., respectively. Determine the percent elongation and percent reduction in area of each specimen.
A simple highway curve is planned to connect two horizontal tangents that intersect at sta. 2500 + 00.00 at an external angle of 52 degrees. For a design speed of 60 mi/hr and a curve radius of about 1.25 times the minimum allowable
In 2003 at Holloman Air Force Base in New Mexico, test engineers set a world record by moving 192 lb payload at 6,453 miles per hour in a rocket sled. The rocket sled track, built in 1954, is 15.44 km in length.
The traffic stream consists of cars, buses, and large trucks (no recreational vechicles). A weekday directional peak-hour volume of 1800 vehicles (familar users) is observed, with 700 arriving in the most congested 15 min period.
Discuss about damp-proofing trenches
Footings for a structure are to be built beneath a basement slab on a clay soil at a depth of 20 ft below present ground level. The groundwater table is 15ft below the ground surface. The soil void-ratio is about 0.087.
Determine how many years from now the consumption will reach its design capacity with current usage rates if the community has a declining growth rate.
Determine the required pumping rate. the aquifer has T= 1600 m2/day and the wells each have radius of influence of 600m.
Base isolation technique has become the method of choice for structural design of buildings and bridges located in highly seismic areas in recent years.
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