A petroleum refinery emits 80 g/sec of SO, from an effective height of 60 m (physical stack height 45 m) in an area with flat terrain. At 8 a.m. on an overcast winter morning when the surface wind (measured at a height of 10 m) is 6 m/sec, what is the ground-level concentration directly downwind from the refinery at a distance of 500 m? What is the concentration at the same distance downwind but at a distance 50 m crosswind from the centerline?

A ground level contamination source emits 0.45 g/s of a toxic gas into a 2.5 m/s wind. Assuming no initial rise of the gas at the point of release, what is the maximum ground-level concentration (in µg/m3) 500 m downwind from the source if the plume's standard deviations are oy = 76 m and oz = 38 m?

If a 136.51 g Al rod (c=0.900 J/g°C) is at 100.0°C and placed into 250.0 g of water at 21.8°C, what is the temperature of the system (rod+water) at equilibrium assuming no losses to the surrounding?

Determine the emission rate of SOx (ton/day) from a rural ground level source if the 2000m downwind concentration is 6.0μg/m^3. The wind velocity of 2m/s and the Pasquill stability is Class C

20.27 Consider a stack that emits a nonreactive pollutant at the rate of 55 g/s. The stack is 85 m tall, and is located in a rural area, surrounded for many miles by open pasture land. The plume rise is 35 m. The sky is cloudy on a November afternoon, and the wind speed (measured at 10 m height) is 6.0 m/s. (a) Esti- mate the downwind, centerline, ground-level concentration at a downwind distance of 5000 meters from this stack. Give your answer in µg/m³. (b) Also, estimate the ground-level concentra- tion at a cross-wind distance of 200 m, but still at the same downwind distance of 5000 m. Give your answer in µg/m³.

A stable layer of air above an unstable layer would have what effect on the dispersion of a ground release of air emissions?

A 0.5 m diameter 20 m high stack releases gases at 500 K at a rate of 10 g/s into asteady 1.0 m/s wind. The exit velocity for the stack is 1.5 m/s and the stack diameter is0.5 m. Assume an inversion height of 1.5 km. Estimate the maximum ground levelconcentration assuming rural stability class B. Repeat assuming rural stability classes Cand D. How significant of an effect does the stability class have on the maximum groundlevel concentrations? Where does the maximum concentration occur for each of the threestability classes? Briefly comment on your results

A paper plant is proposed for a location 1 km upwind from a town.  It will emit 40 g/s of hydrogen sulfide, which has an odor threshold of about 0.1 mg/m3.  Assume that winds at 10 m above ground are 2.5 m/s, and at the effective stack height they typically vary from 4 – 10 m/s blowing toward the town.  If it is summer day with a few broken clouds, What stack height should be used to assure concentrations are no more than 0.1 times the odor threshold at the near edge of town (1 km away)? To be conservative, the stack will be designed assuming no plume rise. Will any buildings (e.g., the country cabin or the doghouse on the far edge of town) experience higher concentrations than a residence at the 1 km boundary? Briefly explain your answer.

A room 3 m X 6 m X 10 m has walls of average absorptivity 0.05. The floor is covered with a rug (a = 0.6), and the ceiling is wood (a = 0.1). ( a ) Calculate the average absorptivity. (b) Calculate the reverberation time from (12.3.4). (c) Calculate the reverberation time from (12.4.2) and compare with the answer to (b).

A new municipal waste combustor burns 300 tons/day of waste and produces 100 dscf of emissions per lb of waste burned. The plant just meets the NSPS emission standards and has an effective stack height of 100 m and is located in a rural area. Under C stability and a windspeed of 4 m/s measured at 10 m, determine Cmax and xmax for (a) PM, (b) Pb in micrograms per cubic meter, and m, respectively