BOD of waste water is estimated by measuring the amount of :

Options

A. total organic matter
B. biodegradable organic matter
C. oxygen evolution
D. oxygen consumption

Answer

D

Explanation

Degree of impurity of water due to organic matter is measured in terms of `BOD`. It is the oxygen in milligrams required for five days in one litre of water at `20^(@)C` for the microorganisms to metabolise organic waste.