A) 0.1 %
B) 2.1 %
C) 5.0 %
D) 10.0-%
Correct Answer: A
Solution :
A mere 0.1% impurities make domestic sewage unfit for human use. These impurities include suspended solids (e.g., sand, silt and clay), colloidal material (e. g., Faecal matter, bacteria, cloth and paper fibres) and dissolved materials e.g., nutrients (nitrate, ammonia, phosphate, sodium, calcium, etc.).
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