Presence of $E. coli$ in water indicates

  • A
    Water is clear
  • B
    Water is fully polluted
  • C
    Inorganic pollution
  • D
    Faecal pollution

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$BOD$ refers to

The primary treatment of sewage water involves

What is the water obtained after the sedimentation process in sewage treatment called?

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During which stage of sewage treatment is the effluent mechanically agitated continuously?

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