Chemical Engineering - Environmental Engineering
Exercise : Environmental Engineering - Section 5
31.
Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about __________ ppm (parts per million).
32.
The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the
33.
Biological oxidation ponds remove organic matters present in the polluted water by
34.
Which of the following is an adsorbant for removal of nitrogen oxides from gas/air ?
35.
Out of the following, TLV of __________ is the minimum (about 0.02 ppm).
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