9:41 "Over 1 billion people live in deserts," so this technology is greatly needed.
Riyad 1:47 pumps desalinated seawater 400 miles across the desert to supply the city, so water is a valuable resource.
A transformed 2:22 toxic waste stream is now a biological water-treatment garden complex 8:00 designed to treat 45 million gallons of water a day, 8:14 getting rid of 89% of fecal coliforms. (By contrast, potable water requires removing more like 99.999% of them.)
3:55 Over 21 hours, water is aerated and then flows through engineered "biocells" including rocks with a biofilm of plants, algae, and microorganisms to purify it.
Eventually 5:55 this recycled wastewater is used for farm irrigation downstream.
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