It’s a pretty long process, involving physical, chemical and even biological processes. First, sewage is ‘settled’ – heavy solids sink to the bottom, while fats and grease rise to the top. These are all removed. The remaining liquid is decontaminated using microorganisms. Some water is used for irrigation/agricultural purposes, and this is all the filter it needs. Water meant for streams, rivers, etc. can undergo further filtration, called microfiltration.
Sewage first gets sent though a series of filters that remove all solids and large bacteria particles from the water. Next, water gets pushed though a membrane that only allows water molecules to pass through. This process is called reverse osmosis.
Lastly, hydrogen peroxide gets added to the water, and then ultraviolet light zaps the water. The light + peroxide disinfects the water and removes most microscopic particles that may have escaped the reverse osmosis. The result is purfied water.
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