Civil Engineering - GATE Exam Questions - Discussion

12. 

Presence of excess nitrates in river water indicates :

[A]. recent pollution of water with sewage
[B]. past pollution of water with sewage
[C]. immediate pollution of water with sewage
[D]. no pollution of water with sewage

Answer: Option B

Explanation:

No answer description available for this question.

Kavita said: (Aug 19, 2017)  
Nitrites indicate the presence of partly decomposed organic matter. Partially decomposition will take some time it means pollution is not recent.

Manish Rai said: (Jun 16, 2018)  
Nitrate indicate the full decomposition so past pollution of water.

Bisma Farooq said: (Jan 22, 2019)  
Presence of Nitrates in sewage indicates that the decompostion of organic nitrogenous matter has come to an end i.e. nitrates are the end products of bacterial decomposition of nitrogenous matter in sewage. Hence their presence means that the water has been polluted in the past.

Anomis said: (Sep 15, 2019)  
Presence of free ammonia or organic nitrogen (indicates recent pollution).

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