How a Sewage Treatment Plant Cleans Water
From dirty water to clean water
0:55 · 720p · With AI narration and captions. This sample was made with the same system as this service.
Narration (full text)
Click a time to play from that scene.
How Sewage Plants Work
Let's follow sewage from our homes as it is cleaned at a treatment plant.
Screen and Grit Chamber
First, screens remove large debris, and a grit chamber lets sand settle out.
Primary Settling Tank
In the primary settling tank, the water flows slowly, so fine dirt settles out as sludge.
Aeration Tank
In the aeration tank, air is blown in, and microbes called activated sludge eat and break down the dirt dissolved in the water.
Final Settling Tank
In the final settling tank, clumps of microbes sink, leaving clean water on top. Some of the settled sludge is sent back to the aeration tank.
Disinfect and Release
Finally, the water is disinfected with chlorine or similar, then released into rivers or the sea. The removed sludge is dewatered, then burned or reused.
Remove, Digest, Disinfect
By removing debris and sludge, letting microbes eat the dirt, and disinfecting it, sewage becomes clean water.
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