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A small lake with volume of 20,000 m^3 has no natural pollutant sources. However, a sewage pipe discharges sewage containing an organic polluntant into the lake. Conditions in the sewage pipe are Qs= 0.5 m^3/s, and Cs= 100mg/L. The pollutant is destroyed in the lake with a first-order rate constant of 0.2/d. The flow rate out of the lake is 5.0 m^3/s. Assume that the lake is well mixed.
(a) Calculate the steady-state pollutant concentration in the lake and
(b) what is the retention time for this lake?
The casting has a mass of 3 Mg. Suspended in a vertical position and initially at rest, it is given an upward speed of V mm/s in 0.3s using a crane hook H. Determine the tension in cables AC and AB during this time interval if the acceleration is ..
If this two-step process is replaced by a single isothermal expansion of the air from 800 K and 4 bar to some final pressure P, what is the value of P that make the work of the two processes the same
The piezometers are 280 m apart. The difference in piezometric head bewteen the two is 1.4 m. The aquifer hydraulic conductivity is 50 m/d and the porosity is 20%.
A sample of argillaceous soil with a volume of 1x10-3 m3 and a mass of 1.762 kg, after oven dried, has a mass of 1.368 kg. The relative density of the grains is equal to 2.69. Determine, for the sample in its original condition
A section view of a dam shown and water is stored at an elevation of 6 m above the base. the water flows through the dam in a concreate opening 2m high and 3 m wide. there are no losses or friction.
A slurry containing 20 percent by weight of limestone (CaCO 3 ) is processes to separate pure dry limestone from water. If feed rate is 2000kg/h, how much CaCO 3 is produced per hour?
An activated sludge process receives 4000m^3 / day containing 120 mg BOD /L from the primary settling tank and 3500 m^3/day Containing 25mg BOD/L from the secondary settling tank.
Calculate the energy released per 42He nucleus produced and per mole of 42He produced. The atomic masses are 21H, 2.01410, 31H, 3.01605, and 42He, 4.00260. The masses of the electron and neutron are 5.4858 10-4 and 1.00866 amu, respectively.
Critical review the decision making of a failed major construction/property project within the UK in the last ten years.
What are Engineering Societies based upon the research? List at least 10 discipline specific engineering societies along with their website addresses.
Precipitation station X was inoperative for part of a month during which a storm occurred. The respective storm at the three surrounding stations A,B and C were 98,80 and 110mm
a gate having cross section shown in fig closes an opening 5 ft and 4 ft high in a water reservoir. The gate weighs 400lb and its center of gravity is 1 ft to the left of AC and 2 ft above BC. Determine the horizontal reaction that is developed on..
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