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Environmental Engineering in CE

Environmental Engineering in CE
Presence of __________ hardness is responsible for the temporary hardness in water.

Calcium
Carbonate
Choride
Sulphate

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Environmental Engineering in CE
Main pollutants released from petroleum refineries is

CO, SO₂ & H₂S
CO₂, H₂S & NO₂
CO₂, NO & SO₃
SO₃, NO₂ & CO₂

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Environmental Engineering in CE
Exposure to SO₂ containing chimney gases results in the

Increased drying & hardening time of paints
Acceleration of corrosion rates of metals
Reduction in strength of leather & cloth
All of these

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Environmental Engineering in CE
Lagooning process is mainly a means of the

Biological treatment of wastes
Reduction of excessive flow in sewers
None of these
Sludge disposal

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Environmental Engineering in CE
The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by

Aerated lagoons
Gravity separator having oil skimming devices
Biological oxygen pond
Trickling filters

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Environmental Engineering in CE
Hydrogen ion concentration in distilled water is

7 x 10⁷
10⁻⁷
10⁷
7 x 10⁻⁷

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