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DOB is quantity of oxygen needed to oxyd organic matiere by micro organism
DCO is quantity of oxygen needed by matiere to oxyd matiere by chemical
BOD : Biochemical oxygen demand is the amount of dissolved oxygen needed by aerobic biological organisms to break down organic material present in a given sample at certain temperature over a specific time period.
COD : is the amount of dissolved oxygen needed by Chemicals to break down organic material present in a given sample at certain temperature over a specific time period.
