Question

name two major water pollutants present in untreated domestic sewage​

Answer 1

Large amount of domestic sewage is drained in to river and most of the sewage is untreated. Domestic sewage contains toxicants, solid waste, plastic litters and bacterial contaminants and these toxic materials causes water pollution.

Answer 2

1) suspended solids:- e.g., sand, slit and clay.

2)colloidal material, e.g., faecal matter, bacteria, cloth & paper fibres

3) dissolved materials:- e.g., nutrients (nitrate ,Ammonia, Phosphate, sodium, calcium).