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

The nitrogen cycle in a fish tank

Ammonia, nitrite and nitrate

PRO · Planet Fixers

World 2: Wastewater and Dead Zones is part of PRO

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  • Too much food: eutrophication
  • Treating wastewater: microbes at work
  • Dissolved oxygen and BOD: reading a river's health
  • How small is "micro"?
  • Where do they come from?
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← Killing the germs: disinfection and why home filters are not enoughToo much food: eutrophication →

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