EXAMIANS
The most commonly used chemical coagulant in water treatment is
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BOD of raw municipal sewage may be in the range of about __________ mg/litre.
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Tolerable limit of nitrogen oxides in air is __________ ppm.
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The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated.
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Which of the following is the most severe air pollutant?
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Brown spots in fabrics will be caused by washing with water containing large amount of .
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Arsenic pollutant is not generated in____industries.
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Inhalation of silica dust by human being causes
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The pH value of oxidised sewage is about
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Phenolic water generated in coke ovens & by-product plant attached to an integrated steel plant containing phenol in concentration of less than 100 mg/litre can be removed by
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