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A fine-bubble aeration basin has a flow of 21.5 mgd, an influent BOD of 180 mg/l, 31 mg/l of mmonia, and effluent of 10 mg/l. During the winter, the wastewater temperature of 14.8 degrees C does not nitrify. During the summer , wastewater temperatures increase to 18.5 degrees C and operators cannot avoid nitirification. The residual DO is controlled to maintain 2.0 mg/l. Diffusers are 15 ft deep. use average oxygen transfer values for (alpha)F and (beta). Calculate (1) winter and (2) summer values for oxygen demand, oxygen tranfer, hp, and airflow rate.
A soil has a total density of 1.80 Mg/m3. When fully dry, the soil has a density of 1.59 Mg/m3. The specific gravity of the solids is 2.57. Find the following soil parameters: a) Dry unit weight of the sample
A 3.60-g lead bullet at 28.0 degrees C is fired at a speed of 230 m/s into a large block of ice at 0 degrees C, in which it embeds itself. What quantity of ice melts?
Show or formulate the shear and bending moment expressions for each board, and plot/draw the shear and bending moment diagrams of the boards.
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
Did the moslem caliphates contribute to the fall of rome? if so how?
the 15,000 kg boxcar A is coasting freely at 1.5 m/s on the horizontal track when it encounters a tank car B having a mass of 12,000 kg and coasting at 0.75 m/s toward it. If the cars meet and couple together
a navel gun (E= 30,000 ksi and G = 11,600 ksi) with a bore of 16 in. develops a maximum internal pressure of 20,000 psi. Determine a. the minimum outside diameter required if the maximum tensile stress permitted in the gun barrel is 36,000 psi.
The company would like to distribute the songs between the two CDs such that the used space on each CD is about the same. Formulate the problem as an IP, and find the optimal solution.
Estimate the required surface area (A), and the diameter and the depth of the tank.
A quality of water within a piston-cylinder assembly executes a Carnot power cycle. During isothermal expansion, the water is heated from saturated liquid at 50 bar until it is a saturated vapor. The vapor then expands adiabatically to a pressure ..
The linkage shown is made up of two 3-kg rectangular members (0.4 m by 0.1 m), and is flying through the air. At the instant shown, the vertical member has angular velocity 4 rad/s, and the angled member has angular velocity 1 rad/s.
A 10cm diameter vertical tank holds 20cm of water topped with 15cm of ethyl alcohol. The cylinder is rotated about its central axis at a rotation rate of 20 rad/s. (a) What will be the shape of the air-alcohol and alcohol-water interfaces (include ..
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