BBC Learning Zone Clips

CLIP 13458

What happens to our sewage?

What happens to our sewage?
Key Info
  • What happens to our sewage?
  • Duration: 09:56
  • Two children meet Curious Cat, an animated cat who asks them if they would like to find out what happens to our sewage once it leaves our homes. The children meet an expert who takes them underground to see a sewer. They see the raw sewage travelling through the sewer tunnel and explore the tunnels. Next, the children visit a sewage treatment plant where they meet another expert who takes them on a tour showing them how the raw sewage comes into the treatment plant and how it is cleaned and sent back into the river. They see how the solid waste in the sewage is taken out and how the microscopic bits of sewage still remaining are eaten by a variety of micro-organisms using a filter bed made of special rocks. Throughout the tour the expert takes water samples so the children can compare the dirty sewage that comes in with the clean water that goes out at the end of the process. First broadcast on BBC Learning Zone in March 2012 as part of the series Curious Cat's Science
  • Subject:



    Separating Mixtures of Materials

  • Keywords: sewage, diseases, bacteria, sewer, tunnel, dirty, treatment, cleaning, river, microorganisms, pumice stones, filter, settlement tank, waste, water, filtered, pipes, dirty water, waste water, gravity, sample, CuriousCatsScience
Ideas for use in class
  • Useful to learn about what happens to our sewage, how a sewer works and how the sewage is treated and cleaned enough to go back into the river. Also useful for learning about the application of science.
Background details
  • Clip language : English
  • Aspect ratio : 16x9

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