EXAMIANS
The lowest layer of atmosphere is known as the
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Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of __________ present in it.
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Removal of __________ is accomplished by aeration of water.
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The main type of sludge gas evolved during sewage treatment in Imhoff tank is
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Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air's water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes
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A shallow pond in which the sewage is retained and biologically treated is called
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The upper layer of atmosphere is called the
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Dust collection efficiency of a cyclone separator depends upon its
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BOD of raw municipal sewage may be in the range of about __________ mg/litre.
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Which of the following is the most lethal water pollutant?
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