Changes

:Sewage is '''treated''' in several stages to make it safe to be released into the environment::#[[Filtration]] - A metal grill with large holes is used to collect large [[object]]s that have made their way into [[sewage]].:#[[Sedimentation]] - Sediment is allowed to fall to the bottom of a container and is removed.:#Digestion - [[Micro-organism]]s are added to the sediment to break down many of the [[chemical]]s into smaller [[soluble]] ones.:#Disinfection - [[Chlorine]] of [[Ultraviolet Light]] is used to kill the [[micro-organism]]s before then being released into rivers or the ocean.:'''Water Treatment''' is important for providing [[Potable Water|potable water]] for [[human]] consumption.===Extra Information==={{#ev:youtube|https://www.youtube.com/watch?v=G244Q4AGJ7U}} ===References=======AQA==== :[https://www.amazon.co.uk/gp/product/1782945571/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945571&linkCode=as2&tag=nrjc-21&linkId=9e29fad914244909903e5e93f8a01d270 ''Water treatment, page 103, GCSE Chemistry; The Revision Guide, CGP, AQA '']:[https://www.amazon.co.uk/gp/product/1782945598/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945598&linkCode=as2&tag=nrjc-21&linkId=ad276ad49df77ab4b40ab4fd0fe10422 ''Water treatment, pages 163-165, GCSE Combined Science; The Revision Guide, CGP, AQA '']:[https://www.amazon.co.uk/gp/product/1471851362/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851362&linkCode=as2&tag=nrjc-21&linkId=7d78d70a2044ee9982dae010c94af92a ''Water treatment, pages 195-8, GCSE Combined Science Trilogy 2, Hodder, AQA '']:[https://www.amazon.co.uk/gp/product/1471851346/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851346&linkCode=as2&tag=nrjc-21&linkId=3ac654f4b0da781c49c855a1af4c92ea ''Water treatment, pages 252-3, GCSE Chemistry, Hodder, AQA ''] ====Edexcel==== :[https://www.amazon.co.uk/gp/product/1782945741/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945741&linkCode=as2&tag=nrjc-21&linkId=30da4f2178da182547b62a7329d13b57 ''Water treatment, page 104, GCSE Combined Science; The Revision Guide, CGP, Edexcel '']:[https://www.amazon.co.uk/gp/product/1782945725/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945725&linkCode=as2&tag=nrjc-21&linkId=694be7494de75af3349537d34e13f7f0 ''Water treatment, page 41, GCSE Chemistry; The Revision Guide, CGP, Edexcel '']:[https://www.amazon.co.uk/gp/product/1782948147/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948147&linkCode=as2&tag=nrjc-21&linkId=f63dcd8345f4e49c717b39a228a36c7c ''Water treatment, pages 112, 113, GCSE Chemistry, CGP, Edexcel ''] ====OCR====:[https://www.amazon.co.uk/gp/product/1782945695/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945695&linkCode=as2&tag=nrjc-21&linkId=ceafcc80bcad6b6754ee97a0c7ceea53 ''Water treatment, page 148, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR '']