Question

Which statement is true from the following?
(A) Amount of whole organic materials present in liquid waste can be determined by measurement of BOD.
(B) Amount of icrobially degradable organic materials in liquid waste can be determined by measurement of COD.
(C) COD is measured by use of mixture of potassium dichromate and concentrated sulphuric acid.
(D) Five days are required for COD measurement.

Answer 1

The test for biochemical oxygen demand takes place by a bioassay procedure that has right measurement by taking oxygen consumed.

This could evaluate and consumed by bacteria from the decomposition of organic matter.

Moreover, the change in DO concentration is measured over a given period of time in water samples.