Researchers use old CDs to purify sewage




Researchers use old CDs to purify sewage
Researchers have found a destination for old optical discs. Like discarded CDs and DVDs use again in water treatment plants, as substrate for zinc oxide. Taiwanese researchers

Zinc oxide may be under the influence of ultraviolet light serve as photocatalyst, which organic molecules can be broken. The optical discs, such as audio CDs, would thereby serve as a substrate. Zinc oxide for On the surface, the researchers from the National Taiwan University, National Applied Research Laboratories and Research Center for Applied Sciences of zinc oxide nanorods grow showed.

The forest of nano-zinc oxide rods causes the breakdown of organic molecules, such as those of synthetic dyes, under the influence of UV light. Because optical discs are made to turn around quickly they proved suitable as a component in a reactor to purify water. The rapid rotation of the CDs with the zinc oxide formed a thin layer of water, which can then be stagnant water. Purified faster

The reactor test set-up made by the Taiwanese consists of a reactor vessel with a rotating disc with zinc oxide. A pump provides water circulation and a UV lamp for the required light. This prototype was to purify, with 150 milliliters per minute could flow. Music CDs on a pint of water within an hour for 95 percent The reactor would be economical and can be. Deployed small By using different layers to pile CDs can be further increased processing speed, the researchers think.



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