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Lake silbersee is located in the German city of Nuernberg. 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-+2HIt has been determined experimentally that the reactionfollows 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 the aeration completly inhibits the production of hydrogen sulfide, how long would it take to reduce H2S concentration fomm500μM to 1μM?
A lagoon with volume 1,200 m3 has been receiving a steady flow of a conservative waste at a rate of 100 m3/day for a long enough time to assume that steady-state conditions apply. The waste entering the lagoon has a concentration of 10 mg/L.
Design a 2:1 rectangular duct and fan system to pull 40000 scfm of air carrying a medium-density dust through an FCD (Final Control Device) with a P of 6.0 in. H2O.
A nylon thread is to be subjected to a 10-N tension. Knowing that E=3.2 GPa, that the maximum allowable normal stress is 40 MPA, and that the length of the thread must not increase by more than 1%
A circular sewer is laid on a slope of 0.5%. What diameter is required if the concrete is to carry 25 cfs. If the desired design mean section velocity is between 3 and 7 feet per second, is the design acceptable
A trapezoidal canal with a bottom width of 2 m, a side slope Z=1.5, and a longitudinal slope of 0.0006 conveys a flow rate of 3 m^3/s. If the water depth in section 1 is 0.78 m and in section 2
How do you find the force ratio equation to determine the maximum total load that can be applied to a truss?
The acceleration of a particle traveling along a straight line is A= (0.02e^t) m/s^2, where t is in seconds. If v=0, s=0 when t = 0, determine the velocity and acceleration of the particle at S= 4m
What textbooks are used and required for CIVE 205, MECH 289, CIVE 290, EPSC 221 and MATH 263 at McGill?
Determine: a) the height of the water, with respect to the base of each standpipe, and b) the effective stress at the depth of each standpipe, at the following times:
A load of 14 tonnes is suspended at the end of a steel rope.If the load is subjected to a maximum acceleration/deceleration of2.5m/s2, when raised and lowered, calculate the diameter of therope needed to support the load.
You are given a mohrs circle with 10 kPa (assume positve since geotech question) in compression for sigmaz and 2 kPa (+ counterclockwise) force for shear z. This force lies on a plane 15 degrees CW.
A 1m thick layer of this soil is packed so that it is as loose as possible (void ratio, e_max ~= 0.9), and then it was vibrated until it was as dense as possible (void ratio, e_min ~= 0.35).
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