What is B.O.D.?
(a) The amount of O2 utilized by organisms in water
(b) The amount of O2 utilized by micro-organisms for decomposition
(c) The total amount of P2 present in water
(d) All of the above.
(b) Strength of sewage or degree of water pollution is measured in terms of BOD (Biochemical Oxygen Demand) value. BOD may be defined as, ‘number of milligrams of O2 required for decomposition of one litre of waste or water by decomposing microorganisms (bacteria)’.
