Mains Paper II · 4 Environment & Ecology · 4.5 Pollution and control

4.5.5 Water pollution: sources, BOD, COD and eutrophication

Water pollution is any change in the physical, chemical or biological quality of water that makes it harmful to life or unfit for use; organic waste is measured by BOD and COD, and nutrient overload causes eutrophication.

  • APPSC Group 2 · Mains Paper II
  • Advanced level
  • 8 min read
  • Full course

Key terms

  • point source
  • non-point source
  • dissolved oxygen
  • BOD
  • COD
  • coliform
  • MPN
  • eutrophication
  • algal bloom
  • water hyacinth
  • Minamata
  • itai-itai
  • sewage treatment

What this note covers

  1. Core factsFoundation
  2. ExplainedStandard
  3. DeeperAdvanced
  4. AP angleStandard
  5. Mains writingMains writing
  6. Common trapsFoundation
  7. Quick revisionFoundation

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