Chemical Engineering :: Environmental Engineering
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The term Biological Oxygen Demand (BOD) is used in relation to
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The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant ?
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Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of
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Which of the following processes is involved in the biochemical treatment of sewage effluents ?
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Infective bacteria in water is killed by the __________ process.
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Fluorosis is caused due to the presence of excessive amount of __________ in drinking water.
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Presence of nitrogen and phosphorous in waste water discharged into lakes and ponds causes
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Pick out the wrong statement.
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Maximum permissible limit of mercury in human blood is __________ micrograms/100 c.c.
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A.
Biological oxygen demand (BOD) is a characteristic and not a constituent of water.
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B.
BOD is a measure of the amount of oxygen which will be demanded & used in 5 days by the biological decomposition of the organic matter present in water stream present as food for the living organism.
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C.
BOD is expressed in mg/litre (typically, BOD=2.5 mg/litre for potable water).
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D.
none of these
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