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United States secondary treatment standards limit BOD5 and suspended solids to a monthly average of

  • A.0.3 milligrams per litre
  • B.30 milligrams per litre
  • C.300 milligrams per litre
  • D.3 milligrams per litre

Answer: B

The standard is 30 milligrams per litre as a monthly average and 45 as a weekly average, together with at least 85 per cent removal. Expressing it both as a concentration and as a percentage prevents a plant from meeting the limit merely by dilution.

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