in Water and Waste Water Quality and Treatment recategorized by
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The wastewater from a city, containing a high concentration of biodegradable organics, is being steadily discharged into a flowing river at a location S. If the rate of aeration of the river water is lower than the rate of degradation of the organics, then the dissolved oxygen of the river water

  1. is lowest at the location S.
  2. is lowest at a point upstream of the location S.
  3. remains constant all along the length of the river.
  4. is lowest at a point downstream of the location S.
in Water and Waste Water Quality and Treatment recategorized by
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