why waste water in black colour? which chemicals are present in that water?
Answers
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The colour of stale sewage is observed to be dark brown or black which indicates that the dissolved oxygen content is very low and the biological decomposition process is slow. Anaerobic decomposition starts after the colour of the sewage turns black as the dissolved oxygen content reaches minimum value.
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Answer:
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.
There are many chemical constituents that enter the municipal waste stream that are of potential concern for human health. These substances include organic chemicals, inorganic trace elements (such as cadmium and lead), and nitrogen.
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