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Determine the volume of three identical activated sludge tanks following primary clarification to aerate 36,000 m cubed/d with a BOD concentration of 180 mg/l at a BOD loading of 560 g/m cubed*d. What is the aeration time? For an F/M of 0.35, what MLSS concentration should be maintained in the aeration tanks? Estimate the operating sludge age, assuming an effluent suspended solids of 30 mg/l and the daily amount of waste activated sludge solids. If the waste sludge has a concentration of 10000 mg/l, what is the calculated volume of sludge to be wasted each day? Determine the dimensions of three identical rectangular clarifiers (length, width, and side water depth) with a 2:1 length to width ratio.
A concrete cylinder of height 8 inches and diameter of 4 inches was tested in the lab. The maximum compressive force was found to be 150,000 lbs and a tensile force of 25000 lbs.
a room is to be maintained at 72 F db. It is estimated that the inside wall surface temperature could be as low as 48 F. What maximum relative and specific humidities can be maintained without condensation on the walls
Near the point (x, y) =(3,2) in a flow with a zero y-component (v=0), the velocity component are described by u =3x-3z, and w = 6-4z+ x. The velocities u and w are in m/s and are in the x- and z- directions, respectively.
Determine the heights of the fluid columns for barometers that use the following liquids at 20 C: water, ethyl alcohol, and mercury. Why do you think mercury barometers were used in the past (before the negative health effects of mercury were know..
The testing machin that covers the right range of load is to be chosen. it is expected to load the material up to a strains of 3%. if th material must remain elastic over that range, what would be the maximum load
According to the design philosophy in the AASHTO Specifications, how does a heavy truck parked on a prestressed bridge girder effect the nominal shear resistance of the girder
A hydraulic transition 100 ft long is used to connect two rectangular channels, 12ft and 6ft wide. The design discharge is 500 cfs, mannining coefficient=.013 and the slopes of the channels are both .0009.
A pile resists the tension developed by three stay cables for a major tent (Membrane) Structure. Assuming no bending is desired in the pile (no resultant horizontal component), what is the magnitude of the force S if the angle \thetaS = 30 degrees
What is the terminal settling velocity of a particle with a specific gravity of 1.4 and a diameter of 0.01 mm in 20 degrees celcius water. What is the smallest diameter particle of specific gravity 1.4
A soil core is selected that consists mostly of quartz and has a total volume of 200 mL. The soil mass as collected (i.e., wet) is 326 g and 290 g after it is dried.
World population reacted 4billion in 197 Use the doubling time approximation (3.5) to estimate the exponential rate of growth that would produce those numbers. Use the exponential growth equation (3.6) to find the growth rate
the hull of a boat has a volme of 150m and the total mass of the boat when empty is 8560kg. determine how much load this boat can carry without sinking in a lake.
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