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Environmental Engineering in CE

Environmental Engineering in CE
In water chemical treatment plant, use of chloramines ensures

Weed control in reservoirs
Disinfection
Taste & odour control
Removal of permanent hardness

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Environmental Engineering in CE
H₂S present in gaseous stream can be removed by adsorption on

Limestone powder
Active carbon
Silica gel
Bog iron

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Environmental Engineering in CE
The resistance of water to the passage of light through it is a measure of the

Dissolved gases
Color
Turbidity
Hardness

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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
Biological oxygen pond
Gravity separator having oil skimming devices
Trickling filters

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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
Sludge disposal
None of these

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Environmental Engineering in CE
Which of the following is an adsorbant for removal of nitrogen oxides from gas/air?

Bog iron (iron oxide)
Silica gel
Pulverised limestone
Active carbon

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