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A conventional active-sludge system treats 11,000 m3/day of wastewater with a BOD of 180 mg/I in an aeration tank with a volume of 3400 m3. The operating conditions are an effluent suspended solids of 20 mg/1, an MLSS concentration of 2500 mg/1 and an activated sludge wasting rate of 160 m3/day containing 8000 mg/1.
a. Calculate the aeration period (7.4 hr)
b. Calculate the BOD loading (36.3 Ib BOD/ 1000 cf-day)
c. Calculate the F/M loading (0.23)
d. Calculate the sludge age (5.7 days)
e. Calculate Qr (4767 m^3/day)
a draw the shearing force diagram and the moment diagram of the following problem. the beam is indeterminate. you need
a 1 meter diameter cylindrical mass is connected to a 2 meter wide rectangular gate. the gate is to open when the water level drops below 2.5 meters. Determine the required value of the mass of the cylinder in kgs.
A river with 400 ppm of salts (a conservative substance) and an upstream flow of 25 m^3/s receives an agricultural discharge of 5.0 m^3/s carrying 2000 mg/L of salts. The salts quickly become uniformly distributed in the river
Choose two research papers-one quantitative and the other qualitative-from the construction management literature - Write a paper (not less than 3,000 words) which discusses in detail the extent to which the authors of your papers followed in their ..
A pile resists the tension developed by three stay cables for a major tent (Membrane) Structure. Assuming no bending is desired in the pile (no resultant horizontal component), what is the magnitude of the force S if the angle \thetaS = 30 degrees
Isolated on a high plateau, the Los Alamos National Laboratory seemed an ideal place to store a bomb factory's deadly debris. But the heavily fractured mountains haven't contained the waste, some of which has trickled down hundreds of feet to the edg..
what would be better a truss with all 60 angles or a truss with a 30 60 90 angle for a bridge design what would be the best design
Calculate the required compressive strength for a concrete mix design if F'c = 5000 psi and data indicate a standard deviation of 600 psi based on 15 tests for a similar concrete mix
The owners wish to achieve an initial acceleration from rest of 22 ft/(sec^2) on a level paved surface. What is the minimum coefficient of road adhesion needed to achieve this acceleration
If a hook can sustain a maximum withdrawal force of 250 N inthe vertical direction, determine the maximum tension, T, that can be exerted.
The slope distance and zenith angle measured from point P to pointQ were 1876.253m and 87.33'24 degrees, respectively. The instrumentand rod target heights were equal. If the elevation of point P is227.965m, above datum, what is the elevation of poin..
If the gulf stream flows north from Mexico at 2 m/s on average, howwould I find the average slope of the Atlantic Ocean across the 45degree N latitude near the Eastern Seaboard of the US?
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