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The preliminary design for a wastewater treatment plant is being developed. The wastewater flow rate is 10,000 m3/day, and the BOD5 concentration is 200 mg/L. The plant discharge standard is 30 mg/L as BOD5. Experience suggests that stable and reliable compliance with this discharge standard can be achieved using an SRT of 5 days. No primary clarifiers are to be provided. For the purpose of this assessment, the wastewater temperature can be assumed to be 20oC. Make a preliminary assessment of the size of bioreactor required if the MLSS concentration is maintained at 2500 mg/L as TSS. Assume that 75% of the MLSS is volatile. Also estimate the kg/day of solids that must be disposed of and the kg/day of oxygen that must be supplied.
A batch dryer with a grain depth of 20 inches contain 21,000 pounds of 20.7% (wb) moisturecontent shelled corn. An airflow of 75,000 pounds dry air per hour is supplied at a temperature of 175°F. The ambient air is 55°F at 100% relative humidity.
At a specified point on a highway, vehicles are known to arrive according to a Poisson process. Vehicles are counted in 20-second intervals, and vehicle counts are taken in 120 of these time intervals.
Assume the rate constant for BOD decay is 0.2 d^-1, the mean velocity of the stream is 0.5 m s^-1, and the initial concentration is 100 mg L^-1 at x=0. Plot the resulting concentration with downstream distance x in km.
Need to design a cantilever retaining wall 8m high, saturated unit weight is 16kn/m 3 , surcharge is 7kn/m 2 , load above wall supported on wall stem
A square yellow-brass bar must not stretch more than 2.5 mm when it is subjected to a tensile load. Knowing that E = 1.5 GPa and that the allowable tensile strength is 150 MPa
Knowing that its speed continues to increase at the same rate until it reaches 100 km/h at point C, 1) determine the speed at point B, and 2) the magnitude of the total acceleration when t = 20 seconds.
A saturated sample of clay with an sl 20 has a natural water content of 32%. What would its dry volume be as a percentage of its original volume of Gs.= 2.67.
Knowing that portion AC of the rope lies in a plane parallel to the xy plane and that the magnitude of the tension T in the rope is 62 lb, determine the moment about O of the resultant force exerted on the pulley by the rope.
A 4 X 8-ft solar collector has water circulating through it at the rate of 1.0 gallon per minute while exposed to sunlight with intensity 300 Btu/ft^2-hr.
Identical bricks 0.1m wide, and weighting 2kg are placed on a plate (assume the plate has neligible weight). Calculate the total weight (and force F required to balance the plate).
The tank is insulated on the outside and the partition between the two sections is also an insulator. The partition can withstand a pressure differential across it of 400 kPa, before rupturing.
On a 20 ft cantilever beam, Load W1=200 or W2=500 or both may be applied at the midpoint B or at the end of the beam C. The bending moment induced at th fixed support A, MA, will depend on the magnitude of the loads at B and C.
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