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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.
Stack gas samples were collected from a sample of 50 incinerators in Chicago. Of the 50 samples, only 18 met an environmental standard for the concentration of a hazardous compound. Can it be concluded that fewer than half of the incinerators in C..
standard air is drawn from the atmosphere into a 1.25 m diameter cylindrical duct by a fan mounted inside the duct. This air is discharged down stream from the fan through a 0.6 m diameter duct at a velocity of 25 m/s and atmosphere pressure.
a channel which has a trapezoidal cross-section with a bottom width of 6 m and side slopes 1:2 discharges water at a rate of 5 m3/s. Determine the critical depth.
The number of telephone call coming in the business switchboard average 4 minutes/call. Let x be the number of calls received, Poisson variable. a. What is the probability there will be at least one call in a given one minute period.
Calculate the average velocity (rnps), crosssectional area (rn"), and depth (m) for the stretch. To make these estimates, assume that the stretch can be idealized as a rectangular channel.
Compare the head loss for water flow (Q=5 cfs) in a 12 in., 3000 ft. long steel pipe using the darcy-weisbach equation and the hazen-williams formula.
The length of the pipeline in the building is 60 m, the water temperature is 20.C, and the water pressure on the top floor must be at least 150 kPa. Will a booster pump be required for the building If so, what power must be supplied by the pump
a reversible refrigerator removesm heat from sink at 8c and rejects heat to the atmosphere at 15c the refrigerator is coubled to the outputnof a reversible heat engine which receives heat at 577c and reject to the atmosphere at 15c
a 25-ft long crane supported at its lower end by a pin is elevated by a horizontal cable as shown in the figure. a
Derive the porosity values for cubic, orthorhombic, and rhombohedral packing of spheres. Include sketches supporting your calculations of the bulk volumes of the unit cells.
Matt is building a stand made out of mud bricks ( ultimatecompressive strength approximately 100 psi and density 250lbs/cubit foot) in the shape of a tent
A sealed insulated room contains 90 m^3 air at 12 C and 100 kPa. A container with 45 kg of water at 95 C is placed in the room. After heat transfer between the air and water, thermal equilibrium is reached.
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