Civil Engineering - UPSC Civil Service Exam Questions - Discussion

5. 

What does high COD to BOD ratio of an organic pollutant represent ?

[A]. High biodegradability of the pollutant
[B]. Low biodegradability of the pollutant
[C]. Presence of free oxygen for aerobic decomposition
[D]. Presence of toxic material in the pollutants

Answer: Option A

Explanation:

No answer description available for this question.

Sunil said: (Aug 29, 2014)  
COD includes decomposition of pollutants chemically, but in case of BOD, it includes only organic decomposition, BOD does not encounter inorganic compound, means if there is degradable pollutants then value of COD would be high.

Aakash Sharma said: (Dec 2, 2015)  
If COD to BOD ratio is high then biodegradability will be low.

Ars said: (Oct 13, 2016)  
I think option D is the answer.

Saurabh said: (May 20, 2017)  
According to me, the answer should be B.

Vikash Prajapati said: (Jun 4, 2017)  
Option B is correct.

@Ars.
D option correct for inorganic substance in pollutant.

Shiva said: (Sep 22, 2017)  
Option B is correct.

Gaurav said: (Oct 24, 2017)  
B is correct, non-bio-degradable will be more.

Sreenu said: (Jun 9, 2018)  
The correct Answer is B.

Sadashiva said: (Aug 24, 2018)  
Answer:B (low biodegradability of the pollutants).

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 biodegradable and non-biodegradable substances whereas BOD contains only bio-degradable.

Bhanu said: (Mar 27, 2019)  
The answer is B.

If answer A it means bod will be close to cod so the ratio will near to 1.

Mandeep Gupta said: (Aug 25, 2019)  
Answer B is correct.

Khalid Khan said: (Aug 27, 2019)  
Since the ratio is high it means bod, demand is low, in other biochemical oxygen is present in excess, therefore there ll be high biodegradability of pollutant.

Hence option A is correct.

Noblen said: (Nov 21, 2020)  
I believe that A is the answer. What makes the COD to BOD ratio high is that technically the value of BOD is expected to be less than the COD. Less BOD means high Dissolved Oxygen. This high amount of dissolved oxygen is said to be directly proportional with expected amount of microorganisms that will degrade the organic.

R Sharma said: (Apr 22, 2021)  
As per GATE 2006, Low COD to BOD ratio of an organic pollutant represents the High biodegradability of the pollutant.

* BOD (Biochemical oxygen demand) - The amount of oxygen required by micro-organisms to degrade the organic matter.
* COD (Chemical Oxygen Demand) - In this process, Use a 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 biodegradable and non-biodegradable substances whereas BOD contains only bio-degradable.

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