Chemical Engineering :: Environmental Engineering
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Water filtration rate in a slow sand filter ranges from __________ litres/m2/hr.
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Lagoons used for purification of polluted water
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There are thirteen metals which are treated as pollutants. Which of the following metals is not a pollutant ?
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The function of skimming tank in sewage treatment is to remove __________ substances.
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The weakest sound that can be heard by a person in a quiet environment is equivalent to __________ decibel.
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Inorganic impurities causing water pollution is
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The main type of sludge gas evolved during sewage treatment in Imhoff tank is
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From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm.
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A.
are large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds.
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B.
use micro-organisms/bacteria in presence of dissolved oxygen.
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C.
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.
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D.
all (a), (b) & (c).
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