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7th Class Science Water: A Precious Resource Question Bank Water : A Precious Resource

  • question_answer
    In a waste water treatment plant, after passing the waste water through a grit and sand removal tank, the water is allowed to settle in a large tank. The solids that settle at the bottom of large tank and called

    A) sewage            

    B) sullage

    C) sludge                         

    D) activated sludge

    Correct Answer: C

    Solution :

    It is called sludge.


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