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Environmental Engineering in CE

Environmental Engineering in CE
COD of raw municipal sewage may be in the range of about __________ mg/litre.

90-120
1-2
5-10
1500-2500

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Environmental Engineering in CE
Ethanolamine is an absorbant used for the removal of __________ from air/gas.

Both B & C
H₂S
SO₂
HF

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Environmental Engineering in CE
The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated.

Increases
Remains constant
May increase or decrease ; depends on the chemical characteristics of polluted water
Decreases

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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
Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by

Discharging in the river stream
Quenching of hot coke
None of these
Filtration and recycling for cooling coke oven gas

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Environmental Engineering in CE
During sewage treatment, the sewage is subjected to __________ treatment in Imhoff tank.

Filtration
Sedimentation
Both B and C
Digestion

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