A mixture (x) in water contains suspended solids, organic impurities, inorganic impurities

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#1

A mixture (x) in water contains suspended solids, organic impurities, inorganic impurities (a), nutrients (b), disease causing bacteria and other microbes. Give names for (x), (a) and (b).
Answer:
(x) Sewage
(a) Nitrates, phosphates and metals
(b) Phosphorus and nitrogen