Subject : Scince; Class:7; Chapter: 18
Question. What is sewage? Explain why it is harmful to discharge untreated sewage into rivers or seas?
Answers
Explanation:
Sewage contains various contaminants including disease-causing bacteria and other microbes. ... 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.
Answer:
Sewage is a liquid waste released by homes, industries, hospitals, offices and other users which also includes rainwater that has run down the street during a storm or heavy rain.
Sewage water contains harmful substances with it which washes off roads and rooftops. It is a complex mixture containing suspended solids, organic and inorganic impurities, and disease causing bacteria and other microbes. So, when untreated sewage discharge into rivers or seas, it will be dangerous for aquatic plants and animals.