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Given: average flow rate = .0022 m^3 /s (190 m^3 /d) Influent Substrate concentration = 250 mg/L as COD (all essentially soluble) Mean cell residence time is to be 5 days Volume of mix tank = 25 m^3 the reactors kenetic constants are: u(max)= 2.4 d^-1 , Ks = 75 mg/L as COD, Y=.4 VSS/g COD, k(d)= .096 d^-1 (K=u(max)/Y) a) What is the hydraulic residence time of the reactor? b) What is the COD removal efficiency of this system? c) What is the biomass concentration in the aeration Tank? d) What is the F/M ratio? e) What is the sludge production rate?
Would you expect to find the Tapeats Sandstone on top of the Great Unconformity in all places in the Grand Canyon? Why, or why not?
The shape below has a cut along the entire length of the member thus making it an open section. The uniform thickness is 0.125in. Determine the maximum shear stress for the shape. Compare the stress for this open shape to a shape without a cut.
Calcium sulfate (CaSO4, solubility product Ksp=2*10^-5 M^2), is added to initially pure water, such that solid CaSO4 remains at equilibrium. (Assume the sulfate does not participate in reaction other than the solubility product; no HSO4- formed).
Find the time for one complete cycle of this motion if the spring constant is 21 N/m. (Assume that once the pendulum ball hits the spring there is no effect due to the vertical movement of the ball.)
A normally consolidated clay layer in the field has a thickness of 3.2 m with an average effective stress of 70 kN/m^2. A laboratory consolidation test on the clay gave the following results: Pressure (kN/m^2)=100, 200 Void Ratio=0.905, 0.815
On average each student produces 1 kg of carbon dioxide per day. The recommended ventilation rate of fresh air to avoid excessive carbon dioxide buildup is 8 L per second per student.
Let event Y be a rainstorm on a given day and event X be lightning on a given day. Let probability of these events be: P(X)=0.3 P(Y)=0.1 P(Y|X)=0.5 What is the probability that both rain and lightning occur on a given day
Find the minimum flow rate of air and the heat exchanger second-law efficiency.
If the pulleys are fixed to the shaft, determine the magnitude of the tension T and the x,y,z componenet sof reaction at the smooth thrust bearing A and smooth journal bearing B.
Cars arrive at a toll gate on a freeway according to a Poisson distribution with mean 90 per hour. Average time for passing through the gate is 38 seconds. Drivers complain of the longwaiting time.
A piston-cylinder device contains 0.2kg of water initially at 800 kPa and 0.06m^3. Now 200 kJ of heat is transferred to the water while its pressure is held constant. Determine the final temperature of the water.
A 3400-lb car is traveling in third gear (ratio 2.5 to 1) on a level road at its top speed of 130 mi/h. The air density is 0.00206 slugs/cuft. The car has frontal area of 19.8 sqft, a drag coefficient of 0.28, a wheel radius of 12.6 inches, a driv..
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