Civil Engineering - UPSC Civil Service Exam Questions - Discussion

Discussion Forum : UPSC Civil Service Exam Questions - Section 6 (Q.No. 5)
5.
What does high COD to BOD ratio of an organic pollutant represent ?
High biodegradability of the pollutant
Low biodegradability of the pollutant
Presence of free oxygen for aerobic decomposition
Presence of toxic material in the pollutants
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
15 comments Page 1 of 2.

R sharma said:   3 years ago
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.
(1)

Sunil said:   10 years ago
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:   9 years ago
If COD to BOD ratio is high then biodegradability will be low.

Ars said:   8 years ago
I think option D is the answer.

Saurabh said:   7 years ago
According to me, the answer should be B.

Vikash prajapati said:   7 years ago
Option B is correct.

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

Shiva said:   7 years ago
Option B is correct.

Gaurav said:   7 years ago
B is correct, non-bio-degradable will be more.

Sreenu said:   6 years ago
The correct Answer is B.

Sadashiva said:   6 years ago
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.


Post your comments here:

Your comments will be displayed after verification.