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Chemical Engineering - Environmental Engineering

Exercise : Environmental Engineering - Section 5
41.
Water filtration rate in a slow sand filter ranges from __________ litres/m2/hr.
10 to 20
100 to 200
1500 to 2500
4000 to 5000
Answer: Option
Explanation:
No answer description is available. Let's discuss.
42.
Lagoons used for purification of polluted water
are large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds.
use micro-organisms/bacteria in presence of dissolved oxygen.
gives an excellent final effluent (with 3 to 4 lagoons arranged in series) having suspended solid < 1 mg/litre and BOD = 3.8 mg/litre.
all (a), (b) & (c).
Answer: Option
Explanation:
No answer description is available. Let's discuss.
43.
The principal gas evolved from sludge digestion tank is
CO
CO2
CH4
N2
Answer: Option
Explanation:
No answer description is available. Let's discuss.
44.
There are thirteen metals which are treated as pollutants. Which of the following metals is not a pollutant ?
Mercury
Arsenic
Aluminium
Lead
Answer: Option
Explanation:
No answer description is available. Let's discuss.
45.
The function of skimming tank in sewage treatment is to remove __________ substances.
dissolved solid
suspended solid
oil & fatty
gritty & inorganic
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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