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Lake silbersee is located in the German city ofNuernberg. The lak's water quality has been diminishedbecause of high hydrogen sulfide concentrations that originate froma nearby leaking landfill. To combat the problem the citydecided to aerate the lake in an attempt to oxidize the odorousH2S to non-odourous sulfate ion according to thefollowing oxidation reaction:
H2S+2O2-->SO42-+2H
It has been determined experimentally that the reaction follows frst order kinetics with respect to both oxygen andhydrogen sulfide concentrations: d[H2S]/dt =-k[H2S][O2]
The present rate of aeration maintains that the oxygenconcentration in the lake at 2 mg/L. The rate constant k forthe reaction was determined to be 1000L/mole-day. If theaeration completly inhibits the production of hydrogen sulfide, how long would it take to reduce H2S concentration fomm500μM to 1μM?
assume a future where security countermeasures against dos attacks are much more widely implemented than at present. in
A solid rectangular simply supported timber beam 6 in wide, 20 in deep, and 10 ft long carries a concentrated load of 16,000 lb at midspan. Use nominal dimensions.
A plant is to be constructed that will emit 3.5 metric tons of hydrogen sulfide per day. One of the design criteria is that the concentration 1 km downwind from the stack must not exceed 120 micrograms/m3.
Three cylinders from the same mix were tested for strenght. Cylinders A and B were cast in 4x8 molds while cylinder C was cast in a 6x12 mold. The total loads were as follows; cylinder A= 65,200 lbs., cylinder B= 68,550 lbs., cylinder C= 151,190 l..
determine the preassure in psi at a depth of 20 ft below the free surface of a body of water and find the absolute pressure when the barometer reads 29.9 inches of mercury.
diameter spaced longitunally every 6 in. Knowing that the average allowable shearing stress in the bolts is 10.5 ksi, determine the largest allowable vertical shear in the beam.
design a cylindrical composite column consisting of some steel rods, and also wrapped in nano-fiber material. The column must support a compressive axial force of 500 kips. The columns length is 5 ft.
A fluid flowing in a pipe 30cm in diameter has a uniform velocity of 4m/s. The pressure at the center of the pipe is 40KPa, and the elevation of the pipe's centerline above an assumed datum is 4.5m. Compute the total energy per unit weight of the ..
A cable is made of two strands of different materials, A and B, and cross sections as follows: For material A, K = 60, 000 psi, n = 0.6, Ao = 0.6 in2 For material B, K = 30, 000 psi, n = 0.5, Ao = 0.3 in2
establish a grass cover over a 10ha landfill. the root zone of the grass is 40cm deep. increase the volumetric water
A space is at a temperature of 75 F, and the relative humidity is 45 percent. find the partial pressures of the air and water vapor
What roles should technical experts like water engineers play in public policy decision-making issues, such as water demand management, water reuse and associate water quality issues
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