Question

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

Answer 1

Sewage is the wastewater containing both liquid and solid wastes produced by human activities from homes, industries, hospitals, offices, etc.
Sewage contains various contaminants including disease-causing bacteria and other microbes. 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. which may lead to death. That is why it is harmful to discharge untreated sewage into rivers or seas.
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Answer 2

hello
here is your answer:-

Sewage simply means waste water. If the untreated sewage is discharged into rivers and seas then the water will become polluted due to the waste water(sewage)and will not be suitable for our use and the water will be contaminated .Also it will increase the growth of harmful microorganisms and will become more harmful for us. The sewage includes both solid and liquid waste.
So,we should not discharge untreated sewage in rivers and seas.

hope it helps you:-)