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The half-saturation constant (kinetic constant) of the Monod equation which governs the reactions in an activated sludge tank is 250 mg of COD per Liter. The maximum specific growth rate of the organisms driving this reaction is 5.0 days -1 and the growth rate is 0.54 day-1. The activated sludge tank has a volume of 40 m3 and the flow rate into it is 400 m3/day. The Mixed Liquor Volatile Suspended Solids (i.e., MLVSS which is X) in the activated sludge tank has a concentration of 3.0 kg/m . Assume the death rate (kd) is zero. (a) What is the: 3(a) hydraulic retention time (in days), and(b) concentration of COD in the effluent (in mg/L)?
what is the uniform deterministic arrival rate if the vehicle queue is cleared in 35 minutes after vehicles begin to arrive (in veh/min.)?
Measurements indicate that to cause this flow the force acting on the contents of the control volume is 40i lb. Determine the net rate of flow of linear momentum through the control surface.
An obstruction is lodged in a 10-ft wide rectangular channel (n = 0.022) that has a botom slope of 0.005. The depth of the channel just upstream of the obstruction is 5.0 ft. If the flow rate is 325 cfs, what is the channel and flow classification
If direct runoff hydrgraph derived from a unit hydrograph of a catchment (drainage area = 50 acre) is 120 acre-ft, back calculate the rainfall amount. Assume total abstraction in the area is 50%.
The velocity of flow toward the sphere along the longitudinal axis is found to be u = - U0 (I - r~/_xl), where r0 is the radius of the sphere and x the distance from its center.
A particle which moves with curvilinear motion has coordinates in meters which vary with time t in seconds according to x = 3.3t2 + 3.1t - 5.3 and y = 5.1t - 4.0. Determine the coordinates of the center of curvature C at time t = 1.9 s.
a spherical balloon is being inflated so that its volume is increasing at the rate of 5 cu meter/min. at what rate is the diameter increasing when the diameter is 12m?
A satellite would have a mass of 200 kg on the surface of the moon. Determine the weight of the satellite in pounds when it is in orbit 10,000 mi. above the surface of the earth.
The span length is 32 feet. Total deflection is not to exceed span/240. Select the lightest (economical) steel wide flange section (W shape) with a yield stress of 50 ksi. Assume the beam weight to be 200 PLF
If the amount of heat transfer in the HE unit is 2460 kJ per kg of steam, what is the magnitude of shaft work obtained from the turbine in kW?
A rear-wheel-drive 3000lb drag race car has a 200-inch wheel base and a center of gravity 20 inches above the pavement and 140 inches behind the front axle. The owners wish to achieve an initial acceleration from rest of 15 ft/s on a level paved s..
a horizontal cylindrical tank 4 ft in diameter and 10 ft long is full of water. find the work done in pumping the water to a point 4 above the top of the tank.
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