Biology, asked by ParamChaudhary, 6 months ago

why waste water becomes black in colour⚫?

Answers

Answered by sartajsingh6965

Anaerobic decomposition starts after the colour of the sewage turns black as the dissolved oxygen content reaches minimum value. The dark grey/brown and black colour is due to the formation of sulphide (produced under anaerobic conditions) reaction with the metals present in sewage.

Answered by chiragchaudhary1501

Answer:

Because of sodium hydro sulphite. The chemical came from various parts in bodies as well as from homes ,cooking waste reacts and form sodium hydro sulphite which makes black in colour.

Explanation:

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