Which of the option shows following examples in ascending order in terms of BOD?
(i) Distilled water (ii) Tap water(iii) Sewage wastes drained in river

ii- i- iii

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i- ii- iii

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iii- i- ii

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iii- ii- i

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Solution

The correct option is B i- ii- iii
BOD is the oxygen required by microorganisms to metabolise organic wastes in the water. Biological treatment of wastewater will reduce the organic impurities or an organic load of polluted water, thus curtail the level of BOD. The greater the content of organic waste in the water greater will be the BOD. Organic waste will be maximum in the sewage waste. Hence it will have the highest BOD. Thus the correct answer is option B.

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