SSC Ecology And Environment Sample Paper NCERT Sample Paper-4

  • question_answer
    In the treatment of waste water before discharge, which treatment stage involves biological treatment?

    A)  Primary treatment

    B)         Secondary treatment

    C)  Tertiary treatment         

    D)  Reverse osmosis stage

    Correct Answer: B

    Solution :

    [b] Sewage water can be treated to remove polluting matter by three stages (i) primary treatment involves physical process of removing the suspended matter (ii) secondary treatment involves biological treatment (iii) tertiary treatment involves remove phosphate, nitrate and sulphate from the water.

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