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A high BOD in an effluent is harmful to a receiving stream because it

  • A.increases the salinity beyond the tolerable limits
  • B.makes the water far too acidic for most organisms
  • C.depletes the dissolved oxygen available to fish
  • D.raises the temperature of the water sharply

Answer: C

Microorganisms degrading the organic load consume dissolved oxygen, and if the demand outruns reaeration the water goes anoxic and fish and invertebrates die. Limiting BOD in the discharge is therefore the primary purpose of secondary treatment.

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