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New method turns sewage sludge into renewable natural gas (Level A1) — aerial view of city during daytime

New method turns sewage sludge into renewable natural gasCEFR A1

26 Apr 2026

LevelA1
A2
B1
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Adapted from Washington State, Futurity • CC BY 4.0

Photo by Marcin Jozwiak, Unsplash

Level A1 – Beginner
2 min
75 words
  • Researchers tested a new method for sludge treatment.
  • The method makes renewable natural gas from sludge.
  • It also lowers the cost of treatment.
  • The method uses heat and high pressure.
  • A small amount of oxygen is added before digestion.
  • Special bacteria turn gas into clean methane.
  • The methane can replace fossil natural gas.
  • This reduces waste and landfill disposal needs.
  • The work could help many local communities.
  • The study shows a sustainable option for cities.

Difficult words

  • sludge — thick wet waste from water or pipes
  • renewable — can be made again and not used up
  • methane — a clean gas used like natural gas
  • landfill — a place where people bury waste
  • digestion — a process that breaks down waste
  • bacteria — very small living things, some make gas

Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.

Discussion questions

  • Would you like this method in your town?
  • Do you think renewable natural gas is good?
  • Does your town have a landfill?

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