4. Why is it necessary to treat sewage before
disposing it off in a water body
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it is neccesary because, if you treat sewage before disposing it will help you have a clean envoirnment for marine life
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Wastewater treatment. The major aim of wastewater treatment is to remove as much of the suspended solids as possible before the remaining water, called effluent, is discharged back to the environment. As solid material decays, it uses up oxygen, which is needed by the plants and animals living in the water
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