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CDs can treat the wastewater
CD-ROMs that have become popular in the 90’s are out of date on the background of MP3-files and the iPod . But what to do with unwanted discs? Of course, they may be simply dropped or forgotten, and can find a practical application, such as wastewater.
At the conference, Frontiers in Optics (FiO) 2013 International Optical Society (The Optical Society, OSA), which will be held from 6 to 10 October in Orlando (Florida), a group of researchers from Taiwan will introduce a new wastewater treatment system with CD drive.
Optical disks are cheap, have a wide application and affordability, – says physicist Ping Ding Cai from the National Taiwan University (National Taiwan University, NTU).
Annually produces about 20 billion discs. Using existing disk cleaning water can reduce the amount of waste.
Cai and his colleagues at the National Taiwan University, National Applied Research Laboratories and Research Center of Taiwan used the surface of the optical disc as a platform for growing tiny erect nanopalochek zinc oxide with a thickness of about one-thousandth the width of a human hair.
Zinc oxide – an inexpensive semiconductor serving as a photocatalyst, capable of destroying organic compounds to ultraviolet light, such as wastewater. First photocatalyst was grown on the surface of the optical disk.
nanorods growing on the disk
The cleaning process is faster thanks to the easy flow of light through a thin film of organic contaminants on the surface of a rotating disk. With this method, researchers completely cleared about 30 liters of water. Besides disk system provides a source of ultraviolet radiation and constant circulation of water.
To estimate the rate of photocatalytic reaction of the scientists used a solution of methyl orange dye. As a result, it was found that the new method allows to remove from water pollution than 95 percent. According to the authors of the development, in the present form, the system is able to clear 150 milliliters of waste water per minute.
Rotating disc reactor does not occupy a lot of space and has high efficiency in comparison with other methods photocatalytic purification of waste waters, said Cai. The system can be applied on a small scale for the purification of water contaminated by domestic, industrial and agricultural effluents.
Scientists continue to work on improving the efficiency of the reactor. One possible way is layering placement drives.
Development of a Japanese engineer can purify tap water before drinking levels directly in the bottle.
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Tags: Water , Nanotechnology , Environmental .
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