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A scrubber reduces sulphur dioxide from \( 2400 \) to \( 96 \) mg/m\(^3\). Its removal efficiency is

  • A.96.0 per cent
  • B.4.0 per cent
  • C.25.0 per cent
  • D.92.0 per cent

Answer: A

The efficiency is \( (2400-96)/2400 = 0.96 \). Wet limestone systems routinely exceed this figure, while a dry sorbent injection retrofit on the same duty would typically reach only sixty to seventy per cent for far less capital outlay.

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