What Should We Do With Old Tires?
Posted on April 30, 2009
Filed Under Uncategorized
Over 1.5 billion tires around the world are wearing each year. Only 300 million – in the United States…
In fact, most of the tires are being dumped in landfills, polluting the environment and the most important is that they are accumulating each year, since living organisms are not able to destroy the rubber.
Meanwhile, the tire is composed of up to 60% rubber, 25% metal and up to 15% of cord - expensive materials and, in general, retaining their original properties for a long time.
Therefore, experts have long been dealing with recycling of tires. The easiest way is to use them as the «tire fuel» -to burn them in power plants, steam boilers etc.
But there is a weak point - tires emit a very toxic substance when burning. A more expensive way of recycling tires is grinding, ie, transforming them into a crumb or powder for further use in the useful products manufacturing.
Even more expensive way is tire freezing in liquid nitrogen, so the rubber becomes fragile as glass and easy to cut (as it being done, for example, in Japan).
In Germany, for example, worn tires disposal is prohibited by law. Germans have to visit repair shops, which are required to pick up this rubber and provide further recycling.
After some processing they’re used as «pillows» for the new roads.
Former tires provide great flexibility to the road canvas, stability and some sound absorbing functions. They also reinforce the banks of reservoirs, dams, slopes and quarries. But in general, the problem of recycling «automotive footwear» remains unsolved.
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