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World 2 · Wastewater and Dead Zones · 11 min · PRO

Dissolved oxygen and BOD: reading a river's health

Warm water, thin air for fish

PRO · Planet Fixers

World 2: Wastewater and Dead Zones is part of PRO

The first world of Planet Fixers is free. PRO opens the other 25 lessons in 6 worlds — simulations, quizzes and all.

  • The nitrogen cycle in a fish tank
  • Too much food: eutrophication
  • Treating wastewater: microbes at work
  • How small is "micro"?
  • Where do they come from?
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  • Practice exams and certificates

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