Question

what is sewage?explain why it is harmful to dis charge untreated sewage into rivers or seas?

Answer 1

Sewage is the wastewater containing both the liquids and solid wastes produced n human activities from homes , industry , hospitals , schools , offices etc.
Sewage contains various contaminants including disease causing microbes and bacteria . IF untreared sewage is discharged into seas , then the water into rivers and seas would also get contaminated .IF this contaminated water is used for drinking , then it can cause diseases such as cholera, typhoid , dysentery etc. Which may lead to death. That is why it is harmful to discharge untreated wastes into rivers and seas.

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Answer 2

Hii dear here is your answer.

Sewage is a liquid waste consists of wastewater from houses, offices, factories, hospitals etc. It is a complex mixture containing suspended solids, organic and inorganic impurities, nutrients, saprotrophic and disease causing bacteria other microbes.

If the untreated sewage is discharged into rivers and seas, it will cause water pollution and soil pollution, in which both the surface water get polluted. Ground water is a source of water for wells, tube wells, springs, and many rivers. Therefore, if it gets polluted, it becomes the most common route for water-borne disease like cholera, typhoid, polio, meningitis, malaria, dengue etc.

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