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The half-saturation constant (kinetic constant) of the Monod model which governs the reactions in the activated sludge system is 90 mg COD L-1. The concentration of Chemical Oxygen Demand (COD) in the effluent from this system is 25 mg L-1. The growth rate of the organisms in this case is 0.9 days-1. The activated sludge tank has a volume of 50 m3 and the flow rate through it is 500 m3 day-1. The organism concentration is measured as MLVSS (mixed liquor volatile suspended solids) and they are being produced at a rate of 150 mg MLVSS L hour at steady state. For this problem assume that the death rate in the process is zero (kd = 0.0) -1 -1
(a) What is the maximum specific growth rate of the organisms (day-1)
(b) What is the concentration of MLVSS in the activated sludge (mg L-1)
(c) What is the sludge wastage rate (kg day-1)?
(d) If the yield coefficient (mass suspended solids produced/mass substrate removed) of the system is 0.8, what is the concentration of COD (mg L-1) in the influent?
A company facing an interest rate of 8% must choose among projects offering the following four-year cash flows. If the company is employing the net present value criterion, which project should they choose
Determine, for the crest and sag vertical curves required, the stationing and elevation of the PVCs and PVTs given that the PVC of the crest curve(on westernmost level highway section) is at station 0+00 and elevation 100 ft.
Straight pipe, pump head=100 ft, pipe diameter=4inches, velocity is 10 ft/sec, no elevation changes. Water at 20C. What is the length of the smooth pipe
The back tangent gradient is -4 percent, the forward tangent gradient is 2 percent, and the elevation of the curve at station 48+50 must equal to at least 510ft. What is the required length of the curve?
How do you find the force ratio equation to determine the maximum total load that can be applied to a truss?
The exterior and interior walls are of concrete block. The roof is constructed of bar joists covered with a steel roof deck, rigid insulation, and built-up roofing.
what is a dummy activity and slack activity and also what are slack variables in linear programming constraints equation
The soil's angle of repose is 35° and its swell is 25%. Find the height and the width of the triangular soil bank that will result from the trench excavation
A sample of natural glacial till was taken from below the groundwater table. The water content was found to be 52%. Estimate the wet density, dry density, buoyant density, porosity and void ratio. Clearly state any necessary assumptions.
Determine the effective annual interest rate for a nominal rate of 8% per year, in which is compounded quarterly.
consider a spacecraft that is positioned directly between the earth and moon.the mass of the moon's is approximately 7.35 X10^22 kg, and at the instant under consideration, the moon is 3.8 X 10^8 km from earth.
A C10x20 catilever beam is 12 feet long, supported on the right side. The beam supports two point loads: Load 1 is 2500 lbf and is located 2.5 feet from the wall. Load 2 is 1300 lbf and is located 12 feet from the wall.
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