Need information on the mathematical relationship between COD & BOD levels in effluent

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I am a student of the Aligarh Muslim University and would like to know if the COD value of any effluent can we calculate its Expected BOD level?
If yes, how can the calculation be done? What is the mathematical relationship between BOD & COD? Kindly explain in detail about the same.

Santosh Yadav,
sabby_joy@rediffmail.com