what is sewage explain why it is harmful to discharge untreated sewage into rivers or seas
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Sewage is a liquid containing wastes which is disposed by households, industrial and agricultural activities in water. It is harmful to discharge untreated sewage into rivers or seas because it can pollute the whole sources of water
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Strictly speaking, sewage is the waste water carried by sewers, or underground pipes.
If untreated water is discharged into rivers or seas, the pollutants in the waste water will pollute the water bodies and heavily affect the aquatic ecosystem.
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