Chemical Engineering - Environmental Engineering
Exercise : Environmental Engineering - Section 4
41.
The type of bacteria which is active in trickling filter during biological treatment of sewage is the __________ bacteria.
42.
Presence of dissolved impurities of __________ is responsible for the red brownish color of water.
43.
TLV of aldrin in public water supply system is about __________ μg/litre.
44.
A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from __________ ppm.
45.
Removal of __________ is accomplished by aeration of water.
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