what is water pollution?
Answers
Answered by
1
Water pollution is the contamination of water bodies, usually as a result of human activities. Water bodies include for example lakes, rivers, oceans, aquifers and groundwater. Water pollution results when contaminants are introduced into the natural environment
Answered by
2
Water pollution
⇒ It is mainly due to addition of sewage, detergents, domestic wastes, infectious agents, industrial wastes, minerals, etc, in the ordinary water.
⇒ Degree of water pollution is measured in the term of BOD (Biological Oxygen Demand).
⇒ If BOD is less than 1500 mg/L, it indicates less pollution.
⇒ If BOD is 1500-4000 mg/L, it indicates medium pollution.
⇒If BOD is more than 4000 mg/L, it indicates high pollution.
⇒ Mercury (Hg) is very persistent effluent.
⇒ Cadmium (Cd) accumulation in liver, kidney and thyroid causes itai-itai (ouch-ouch) disease.
Similar questions