Wednesday, June 5, 2013

Recycling Old Tires- What's Being Done

Recycled tires used for bicycle parking


Recycling is defined as the process of re-using waste materials or used products, and turning them into new products. The most commonly-recycled materials include plastic, glass, metal, textiles, and different electronic components. However, would it be possible to recycle old or used car tires? Here’s a look at the right methods for recycling old motor vehicle tires.

Used Car Tires Was Once A Recycling Nightmare


Years ago, most people changed their old tires, and simply put the used ones into a road side ditch or abandoned parking lot. Back then, old tires were considered a recycling nightmare, because there were no available options for recovering or re-using them.

Although there were a few companies that were willing to take your old tires, these were simply burned in an open pit. The burning of tires however is environmentally-unsafe, because cadmium, lead, arsenic, mercury, chromium and other toxic substances are released in to the air when these are burned. The burning of car tires also leads to a host of cardiac and respiratory problems for those who inhale the fumes.

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How Used Car Tires Are Recycled Today


chairs made for bicycle tires
With the advent of more advanced technology, old tires can now safely be disposed and recycled. It’s estimated that around 1.3 billion tires are sold each year worldwide. While before only ten percent of discarded tires were actually recycled today more than eighty percent of used tires today now make their way into a recycling facility.

Hundreds of different applications have now been developed for recycling and re-using used car components and materials. It’s estimated that 1 in 4 of the used tires today are re-treaded, and used again in another motor vehicle somewhere else. Many of the used tires today are also ground up, chopped, and used as a base for gravel roads, and as a sand and gravel substitute in road construction activities. Some used tires are also chopped up and mixed as part of the surface for indoor tennis courts or indoor sports playing fields.

Pyrolisis- A New Method For Recycling Used Tires


a drawing of a pyrolysis plant
While the improper disposal or burning of used car tires has not yet completely disappeared, the disposal and recycling of these items has improved. A new process called pyrolisis, is an eco-friendly technique that uses a special mechanism for heating old tires, in a closed and oxygen-free environment. Recently, an electro-magnetic pyrolisis process was also introduced, which helps churn out metal, gas, carbon and artificial oil by-products. Through pyrolisis, a recycled automobile tire now is able to yield one kilogram of steel, four kilograms of carbon, four liters of oil, and 850 liters of reusable combustible gas.

Used vehicle tires can now be recycled in many ways. In some areas, steel mills use old tires as a carbon source, effectively replacing coal and other sources for powering their machines. Used tires are now also used as barriers for rainwater runoff control, erosion control, road collision barriers, and wave-action barriers which protect ports and coastal areas.

For 22 images of what other people have done with  their used tires

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Process of Pyrolysis (video)


Published on Jan 8, 2013
This video is made available as part of the biofuels education projects funded by the National Science Foundation and the U.S. Department of Agriculture.

The animation illustrate the process of fast pyrolysis which takes the bio-oil as example of the final product. It includes pretreatment, pyrolysis reaction, char collection, quench system, and bio-oil storage.




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