The average BOD5 of domestic sewage is
The relative stability of a sewage sample, whose D.O. equals the total oxygen required to satisfy its BOD, is
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Complete thorough treatment should generally be given to sewage, before its disposal in a stream, if the dilution factor available is
Algae dies out, though fish life may survive, in a river zone, known as
If a sewer drain carrying a discharge of 2 cumecs, out falls into a river carrying a discharge of 10 cumecs, and having DO equal to 8.4 mg/l, the resultant DO of the mix. will be equal to
The phenomenon by virtue of which a soil is dogged with sewage matter, is called
One litre of sewage, when allowed to settle for 30 minutes gives a sludge volume of 27 cm3. If the dry weight of this sludge is 3.0 grams, then its sludge volume index will be
Eutrophication of water bodies is caused by the
14 videos|99 docs|98 tests
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14 videos|99 docs|98 tests
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