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The presence of which of the following indicates old pollution?

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in Environmental Engineering by (81.4k points)
The presence of which of the following indicates old pollution?

(a) Nitrates

(b) Nitrites

(c) H2S

(d) Sulfates

I had been asked this question during an online exam.

My question comes from Chemical Characteristics of Waste Water topic in section Wastewater Characteristics of Environmental Engineering

1 Answer

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Best answer
Correct option is (d) Sulfates

The best explanation: The presence of nitrates indicates the old pollution. It also means that the nitrogen is fully oxidized in sewage.

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