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    Biology
    Grade-7
    Easy

    Question

    To eliminate contaminants from wastewater, _________ treatment uses physical, chemical, and biological methods.

    1. Distillation
    2. Potassium permanganate
    3. Sewage
    4. Carbon

    hintHint:

    The waste water that is collected in sewers.

    The correct answer is: Sewage

      • Sewage is the waste water that is produced from residential and industrial areas
      • The sewage is collected by network of pipes called as sewerage
      • The waste water is subjected to treatment which can the be reused or can be released into water bodies
      • The water is treated by physical, chemical or biological methods  (depending on the nature of waste water)

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