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Determine the activated sludge aeration volume required to treat 2.64 mgd with a BOD of 120 mg/l based on the criteria of a maximum BOD loading of 40 lb/1000 ft cubed/day and a minimum aeration period of 5 hr. Assuming an operating F/M of 0.2 lb BOD/day per lb of MLSS, calculate the MLSS to be maintained in the aeration tank. Estimate the operating sludge age (mean cell residence time), assuming an effluent suspended solids of 30 mg/l and the daily amount of waste sludge solids. Determine the diameter and side water depth of two identical final clarifiers for this activated sludge system.
a car travelling at 60 mph in a construction area skids into a stack of concrete barriers. skid marks leading to the
For Oil (SG=0.86, u=0.025 Ns/m^2) flow of 0.3m^3/s through a round pipe with diameter of 500 mm, determine the Reynolds number. Is the flow laminar or turbulent
A particle begins from s=0 and is traveling along a straight path at a velocity of v=(t^2-4t+3) m/s, where t is in seconds. Construct a v-t graph and an a-t graph at the time interval t=0 to t=4 s.
A train of total mass equal to 500 Megagrams starts from rest and accelerates uniformly to a speed of 90 km/h in 50 s. After reaching this speed, the train travels with a constant velocity.
If the component of velocity along the axis is Vx=6t with t in seconds. determine the particle's distance from the oriigin which is at t=3s. when t=0, x=0, and y=0. also determine the magnitude of acceleration when t=3, x and y are in ft.
A person on the moon wishes to determine the mass of a rock. He has a spring scale calibrated to read pounds mass at a location where the acceleration of gravity is 32.186 ft/s 2 . The rock gives a reading of 18.76 on this scale.
A 100-ft steel tape of cross-sectional area 0.0025 in^2, weight 2.3 lb, and standardized at 68 degrees F is 99.992 ft between end marks when supported throughout under a 12-lb pull.
A centrifugal pump is used to pump water from ariver. The absolute velocity V2 = 82ft/s is at an angle of 25 degrees to theradial direction. The impeller's thickness is of 1.2 in and r2= 0.86 ft and rotates at a speed of 1250 rpm.
The x-component of a velocity field is ax+b.If the flow is steady, two-dimentional and incompressible; generate an expression for velocity component in the y-direction as a function of x and y.
A site is underlain by a soil that has a unit weight of 118 lb/ft^3. From laboratory shear strenght tests that closely simulated the field conditions, the total stress parameters were measured to be C_T=250 lb/ft^2
Conduct a powder factor design for the following conditions: -Rock is iron ore; density is 5370 lb/cubic yards -Rock swells 60% from in situ when broken -Bench height is 45ft -Drill hole diameter is 12.25 inches
A tollbooth is to be added, thus reducing the travel time tocross the bridge. The new cost function is C = 50 + 0.2V. Determinethe volume of traffic that would cross the bridge.
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