Discussion
Grit is removed early in treatment chiefly to
Answer: A
Correct answer: protect pumps and pipework from abrasion
Grit is sand and similar dense inorganic matter, and it wears pumps, valves and pipe bends rapidly and accumulates in tanks. Removing it early is a mechanical protection rather than a treatment step - it contributes almost nothing to the oxygen demand and carries few pathogens.
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