GATE 2006
Low COD to BOD ratio of an organic pollutant
represents
(A) Low biodegradability of the pollutant
(B) Presence of free oxygen for aerobic
decomposition
(C) High biodegradability of the pollutant
(D) High arsenic in the pollutant
Answer: (C) High biodegradability of the
pollutant
·
BOD (Biochemical oxyen demand) - The amount
of oxygen required by micro-organisms to degrade the organic matter.
·
COD
(Chemical Oxygen Demnad) - In this process , Use of strong chemical agent (such
as potassium dichromate) is used to degrade both the organic as well as
inorganic matter present in the wastewater samples.
·
COD
values are always higher than the BOD values. Because COD includes both
biodegradbale and non-biodegradable substances whereas BOD contains only
bio-degradable.
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