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Interactive video lesson plan for: How Does Water Treatment Work | Chemistry for All | FuseSchool

Activity overview:

Learn the basics about water treatment, as a part of environmental chemistry.

Human beings have added to the natural water cycle by taking water from rivers for use in our towns and cities.

We are taking a huge amount of water from natural sources to use in our homes and industries.

Lots of humans take water for granted. For some people water is a precious and scarce resource. Only 3% of the water in the world is fresh. Of this, three quarters is locked up as ice, one quarter is under ground and only 1% is above ground in rivers and lakes.

Global demand for water is increasing hugely.

Water is mainly used for irrigation of crops, and normally this needs no further purification. The next biggest user is industry. Sometimes, for example in food preparation very clean water is needed. Finally there is the domestic water.

Some people are lucky enough to have domestic water piped to their house, and this is usually of drinkable quality and so undergoes treatment first.

Piped water from the water works originally comes from rivers, lakes, reservoirs, or underground aquifers. A grill stops large floating objects, such as fish, from entering the water works.

Next coagulants, such as Alum, are added which causes tiny particles in the water to cluster in lumps which then settle in the sedimentation process. The filter is made of fine sand to capture any particles that are left. Finally chlorine is added to kill any bacteria. If the water does not naturally contain fluoride ions they are often added as sodium fluoride as an aid to build strong teeth in those that drink the water.

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This video is part of 'Chemistry for All' - a Chemistry Education project by our Charity Fuse Foundation - the organisation behind The Fuse School. These videos can be used in a flipped classroom model or as a revision aid. Find our other Chemistry videos here:

https://www.youtube.com/playlist?list=PLW0gavSzhMlReKGMVfUt6YuNQsO0bqSMV

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This Open Educational Resource is free of charge, under a Creative Commons License: Attribution-NonCommercial CC BY-NC ( View License Deed: http://creativecommons.org/licenses/by-nc/4.0/ ). You are allowed to download the video for nonprofit, educational use. If you would like to modify the video, please contact us: info@fuseschool.org

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