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Backriver wastewater treatment plant must disinfect its effluent before discharging the wasterwater onto Backriver. The plant has plug flow reactor of length 1800m which treats the wastewater biologically by first order reaction with decay at a rate constant of 0.20h^-1. The wastewater influent has a linear velocity of 0.5m/s and contains 3.0x10^5 fecal coliform colony unit (CFU) per liter. Determine the coliform concentration of the discharge effluent into Back river.
Section AB of a pipeline lies in th eyz plane and forms an angle of 37 degrees with the z axis. Branch lines CD and EF join AB as shown. Determine the angle formed by the pipes.
Water flows at 8 m^3/s through a rectangular channel 4 m wide and 3 m deep. If the velocity is 1 m/s, calculate the flow depth in the channel. If this channel expands downstream to a width of 5m and the depth decreases by 0.5m from the upstream de..
clay was extracted from a soil sampling tube to form a cylindrical sample 100 mm in diameter and 100mm in length.the sample was weighed in its natrual moist state and found to have a total mass of 1531g.
A computer CPU chip consists of 50 g silicon,20g copper, and 50 g polyvinyl chloride (plastic). It heats from 15?C to 75?C as the computer is turned on. How much did the entropy increase
A 1.0-in-diameter hole is drilled on the centerline of a long, flat steel bar that is 1/2" thick and 4" wide. The bar is subjected to a tensile load of 30,000 lb. Calculate the average stress in the plane of the reduced cross section and the maxium t..
Fluid flows steadily, at a volume rate Q, through a large pipe and then divides into two small pipes, the larger of which has an inside diameter of 25 mm and carries three times the flow of the smaller pipe.
The total saturated thickness of the aquifer is 15 m. Predict the concentration distribution along the water table after 5110 days, assuming a linear groundwater velocity of 1.6x10-3; dispersivities in x, y, and z of 5.0 m, 0.5 m, and 0.1 m
Estimate the average hourly, average daily, and minimum hourly residential sewage flows from an area serving a population of 1500 people. Assume that the lenghth of sewer and house drains equals 3.0 km and that infiltration occurs
Write a paragraph explaining how the relaxation modulus of a plastic material measured in engineering practice. use a sketch.
A one-story, 50-m wide X 90-m long manufacturing building is to be built on a site underlain by medium dense to dense silty sand with occasional gravel. This soil probably has better than-average engineering properties and average uniformity.
assume a future where security countermeasures against dos attacks are much more widely implemented than at present. in
A jar test has shown that the optimum dose of ferric chlorideconsumes all of the alkalinity. If the amount of the ferricchloride that is in excess is 10 mg/l, how much lime(Ca(OH)2) in mg/l must be added to neutralize the acidformed.
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