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The concentration of UBOD in a river entering the first of two lakes that are connected in a series is equal to 20m/L. If the first-order BOD reaction rate constant (K) equals 0.35 d^-1 and complete mixing occurs in each lake, what is the concentration of UBOD at the outlet of each lake? The flow in the river is equal to 4000 m^3/d and the volume of the first and second lake is 20,000 and 12,000 m^3, respectively. Assume steady-state conditions.
Part B- If the length of the river connection between the two lakes is equal to 3km and the velocity in the river is equal to 0.4 m/s, determine the concentration of UBOD in the effluent from the second lake.
Athletic Lake has a surface area of 75.96 km2. In September, the evaporation was estimated to be 3.20 inches and the precipitation was 3.45 inches. The average flow rate of the River Tiger into the lake was determined to be 3.5 m3/s and the average f..
As a design engineer you are responsible for all the drawing documentation from your organisation. What are the key aspects of the drawing you need to check before sending it to the construction division
A barge has the trapeziodal shape and is 22 m long into the paper. If the total weight of barge and cargo is 350 tons, what is the draft H of the barge when floating in sea water
A certain fluid at 15 psia is contained in a cylinder behind a frictionless piston. The initial volume of the fluid is 300 in^3. The fluid expands to a volume of 450 in^3 while the pressure increases to 25 psia
The settling velocity of alum floc in a sedimentation basin is approximately 0.0014 fps. Calculate the equivalent overflow rate in gpd/ft2. What is the minimum detention time in hours to settle out the alum floc in an ideal basin with a depth of 10 f..
Sub 12 means from stage one to two. Heat transfer (Qsub12) occurs to a fluid of mass m whose volume increases at a constant pressure of 21 bar. Assume that the fluid is air (Csubv=0.718 kJ/kg *K and R=0.287 kJ/kg*K) and that Tsub1=725K and Tsub2=1100..
A water pump can generate a pressure diference ΔP (psi) given by ΔP=145-0.1Q2, Q is the flow rate in ft3/s. It suplies a pipe of diameter 20", roughness of .5 inches and length of 2500 ft.
Calculate the average velocity (rnps), crosssectional area (rn"), and depth (m) for the stretch. To make these estimates, assume that the stretch can be idealized as a rectangular channel.
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
a coaxial cable consists of a long straight filament surrounded by a long coaxial cylindrical conducting shell assume charge Q is on the filament zero net charge is on the shell and the electric field is E at a particular point P
A 30 g bullet is fired with a horizontal velocity of 450 m/s through 3-kg block B and becomes embedded in carrier C which has a mass of 30 kg. After the impact, block B slides 0.3m on C before coming to rest relative to the carrier.
A first order reaction is employed in a destruction kind of a certain kind of microorganism. ozone is used as the disinfectant and the reaction is found to be dC/dt=-kC. where C is the concentration of microorganisms, microbes/ml.
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