# environmental engineering

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A power plant emits 120 lb of flyash per
hour up the stack. The flow rate of the hot
gases in the stack is 25 ft3/sec. What is the
concentration of the flyash in micrograms per
cubic meter?

• environmental engineering -

120Lbs/h * 454g/Lb. * 1h/3600s=15.13 g/s
of flyash.

25Ft^3/s * 1m^3/35.94Ft^3 = 0.696 m^3/s.

Concentration = 15.13g/s * 1s/0.696m^3 =
27.75 g/m^3 = 2.775*10^6 ug/m^3.

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