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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 them. Next, the children visit a sewage treatment plant where they meet a second 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 microorganisms 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.
This clip is from:
First broadcast:
14 March 2012

Classroom Ideas

The clip would provide an opportunity for children to consider the implications for areas of the world who have no sewage system. They could think of the dangers faced by the people and maybe suggest ways to overcome the problems. Alternatively the clip could provide a way in to looking at filtering and children could design a simple water filtration system by experimenting with different media such as sand, gravel and fabrics, to see which combinations can clean a sample of dirty water the best.

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