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The type of wastewater from the flushing operation of toilet is __________

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The type of wastewater from the flushing operation of toilet is __________

(a) Green water

(b) Red water

(c) Black water

(d) Brown water

This question was posed to me at a job interview.

Enquiry is from Physical Characteristics of Waste Water in division Wastewater Characteristics of Environmental Engineering

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Right option is (c) Black water

To explain I would say: The type of wastewater from the flushing operation of toilet is black in color and if it does not include urine, then it is brown in color.

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