NURSING ANM AND GNM

Detailed explanation-1: -If untreated sewage is discharged into rivers or seas, then the water in the rivers or seas would also get contaminated. If this contaminated water is used for drinking, then it can cause diseases such as cholera, typhoid, dysentery, etc. That is why it is harmful to discharge untreated sewage into rivers or seas.

Detailed explanation-2: -What harm can dumping of untreated sewage into a river cause? ANSWER: Untreated sewage contains many harmful microorganisms like bacteria, parasites, viruses and fungi. When dumped into the river untreated, it can potentially infect human beings with diseases such as diarrhoea, dysentery, cholera, typhoid and jaundice.

Detailed explanation-3: -If untreated sewage gets into rivers, microorganisms decompose it. They use oxygen from the water for aerobic respiration. As a result, there is a depletion of oxygen dissolved in water. Due to less dissolved oxygen in water, aquatic organisms such as fish and insects may be unable to survive.