List the types of impurities in sewage water with an example of each. (2 marks)

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Solution

The types of impurities in sewage are:-
1. Organic impurities - eg. fruits and vegetable waste (0.5 mark)
2. Inorganic impurities - eg. metals (0.5 mark)
3.Nutrients - eg. nitrogen (0.5 mark)
4. Biological impurities - eg. Bacteria like vibrio cholerae (0.5 mark)

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