Civil Engineering - Waste Water Engineering - Discussion

35. 

Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to

[A]. initial demand
[B]. first stage demand
[C]. carbonaceous demand
[D]. all of these.

Answer: Option D

Explanation:

No answer description available for this question.

Subhasis Mondal said: (Oct 1, 2016)  
Normally we calculate BOD for 5 days. I want to know is this question right?

Gajendra Singh Rajpoot said: (Feb 22, 2018)  
Yes, it is right! We calculate the BOD after 5 days incubation period.

This is the standard method as per the code specified.

Deepak said: (Mar 15, 2019)  
1st stage oxidation is carbonaceous demand or BOD.

2nd stage oxidation is nitrogenous oxygen demand.

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