Question : Which of the following is an organic impurity in sewage?
Option 1: Phosphates
Option 2: Human faeces
Option 3: Nitrates
Option 4: Metals
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Correct Answer: Human faeces
Solution : The correct answer is Human faeces .
Human faeces is an organic impurity in sewage. It contains organic matter such as undigested food, bacteria, and other biological substances. These organic impurities contribute to the Biochemical Oxygen Demand (BOD) in sewage, affecting water quality and necessitating proper treatment before discharge into the environment.
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