Question

What is sewage? Explain why it is harmful to discharge untreated sewage into rivers or seas.

Answer 1

Sewage is the organic human excreta or sludge . It is harmful to discharge untreated sewage into rivers or seas because it increase the temperature of water bodies which harms aquatic animals.

Answer 2

Sewage is wastewater released by homes, industries, hospital,offices and other users.

Sewage is harmful if discharge untreated into river or seas because it will increase the temperature of water bodies and it will kill all the organisms found in water bodies