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A low rate trickling filter plant gives 95% BOD5 removal. the primary clarifier removes 33% of the BOD5 applied to it. the secondary sludge amounts to 0.029lb dry solid/cap-day. if the raw wastewater has a BOD5 of 0.17lb/cap-day. determine the secondary sludge produced per day per pound of BOD5 removal.
Knowing that the tension is 120 lb in AB and 40 lb in AD, determine graphically the magnitude and direction of the resultant of the forces exerted by the stays at A
Find the settling velocity of a 20 µm diameter particle with density 1500 kg/m3. If this particle had been hurled to a height of 8,000 m during a volcanic eruption, estimate the time required to reach the ground
A 2000-ft vertical curve connects a +3% grade to a -5% grade. If the vertical tangents intersect at sta. 52 + 60.55 and elevation 877.62 ft, calculate the elevations at the VPC, VPT, high point, and sta. 54 + 00.
Calculate the super-elevation required for a horizontal curve on a two-lane, two- way highway with 60 mph design speed, and a 1200 ft. radius curve. What is the required length of the spiral curve
An ocean outfall diffuser that discharges treated wastewater into the Pacific Ocean is 500m from a public beach. The wastewater contains 105 coliform bacteria per milliliter. The wastewater discharge flow rate is 0.3 m3/s.
Which of the following is not a basic systems engineering concept?a. Define need before function
Head loss and sunshine striking a pipeline cause the temperature of the water flowing inside to rise by 2 degrees Celsius between two measuring points. Find the heat gain in J/N and cal/N.
A cube of moist soil weighs 330 lb and has a volume of 3.00 ft3. Its moisture content is 27.0% and the specific gravity of solids is 2.72. Compute the void ratio, porosity, degree of saturation, unit weight and dry unit weight of this soil.
Three reservoirs are connected by three pipes as shown in Figure 1 with hA = 100 ft, hB = 20 ft, hC = 0 ft, l1 = 1000 ft, l2 = 500 ft, l3 = 400 ft and D1 = D2 = D3 = 1 ft. Determine flow rate into or out of each reservoir if friction in each pipe is ..
you are working as a project analyst for the local gas utility and you have been placed on a project to install an
Calculate the fraction of total atrazine that will be adsorbed to the soil given that the soil has an organic carbon content of 2.5%. The bulk density of the soil is 1.25 g/cm3; this means that each cubic centimeter of soil (soil plus water) conta..
A square plate of uniform thickness has a side length of 25 cm that hangs vertically from hinges at its top edge, When horizontal jet strikes the plate at its center, the plate is deflected and comes to rest at an angle of 30o to the vertical.
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