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The permissible limit of arsenic in drinking water as per the guidelines of WHO is
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Water containing substances which are undesirable, harmful or unfit for drinking and domestic uses is called
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For very strong sewage, BOD will be
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A sewer is commonly designed to attain self-cleansing velocity at
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Broadly speaking, water is
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The maximum efficiency of BOD removal is achieved in
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In biological treatment there is formation of a biological film of
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The depletion of dissolved oxygen due to BOD reaction of sewage is called
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“The pathogens in river flows are killed and helps in self-purification”. It is due to
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Direct destruction to pathogenic bacteria is caused by
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