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1.Facultative stabilization ponds with a total surface area of 6.0 ha serve a community with a waste discharge of 530 m cubed/d at a BOD of 280 mg/l. Calculate the BOD loading and days of winter storage available between the 0.6 and 1.5 m depths, assuming a daily water loss of 0.30 cm by evaporation and seepage.
2.State the two main reasons why an activated sludge system is operated at a relatively low food/microorganism ratio
A motorists inflates the tires of her car to a gauge pressure of 180 kilopascals on a day when the temperature is -8.0 degrees Celsius. When she arrives at her destination, the tire gauge pressure has increased to 245 kilopascals.
if each cord can sustain maximum tension of 50N before it fails, determine the greatest weight of the flower pot the cords can support
A three-span continuous beam ABCD with three equal spans supports a uniform load with intensity q. Determine all reactions of this beam and draw the shear force and bending moment diagrams labelling all critical ordinates.
Assuming that silt is equivalent to a liquid having a density of 1760 kg/m3, determine the overturning moment of silt and water about point A.
Two piezometers are located 1000 ft apart with the bottom located at depths of 50 ft and 350 ft, respectively, in a 400-ft-thick unconfined aquifer. The depth to the water table is 50 ft in the deeper piezometer and 40 ft in the shallow one.
A toxic compound being is removed from solution in a CSTR at Steady State according to a first order reaction rate. The upstream concentration of the pollutant is 14 mg/L and the downstream concentration is 1.7 mg/L.
A line passes through the points (20m, 16m) and (-1m, -4m). Determine the perpendicular distance d from the line to the origin O of the system of coordinates.
Assuming constant acceleration, determine how long the train blocked the crossing. Dis- regard the width of the crossing.
A 300 N force is applied at A as shown. Determine (a) the moment of the 300 N force about D, (b) the magnitude and sense of the horizontal force applied at C that creates the same moment about D, (c) the smallest force applied at C that creates the s..
the two particles A and B start at the origin O and trevel in opposite directions along the circular path at constant speeds va =.7 m/s and vb =1.5 m/s . Determine the time when they collide and the magnitude
You have a $1,500 monthly loan payment. If inflation is 3.5% annually (compounded monthly). What is the constant dollar amount of this payment in your 80th month
a barge has the trapezoid chape. It is 22 m long into paper. If the total weight of barge and cargo is 350 tons, what is the draft "h" of the barge when floating in seawater
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