Chemical Engineering - Environmental Engineering
Exercise : Environmental Engineering - Section 3
31.
The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels.
32.
The most commonly used chemical coagulant in water treatment is
33.
The biological decomposition of organic substances in wastes controlled conditions is called
34.
Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of
35.
Smog is not formed due to the presence of __________ in the atmosphere.
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