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Old tyres prove successful as kiln fuel, finds EA trial

A trial to use old tyres as fuel for a high-temperature cement kiln has met critical success factors set out by test supervisors the Environment Agency (EA). This means that kiln operator Tarmac Buxton Lime and Cement (Tarmac) can continue to use the tyres as an alternative fuel to coal or coke, while the EA considers the trial results in detail. The kiln, at Tunstead Quarry, near Peak Dale, Buxton, used the equivalent of two million old tyres during the trial. Tarmac said that using tyres in this way reduces the amount of fossil fuels and cuts nitrogen oxides by 15%. Fuels development manager Hasan Bobat added: Its good news for the local environment and for wider society as fossil fuel consumption has been reduced while a beneficial use has been found for a waste which was disposed of in landfills. Used tyre supplier Credential Environmentals director Steve Patterson added: This promises to be an exciting breakthrough for the recycling of used tyres. The trial was carried out in the latter part of 2006 and early 2007, and used state of the art monitoring methods to compare plant emissions when using conventional fuels, coal and petroleum coke, with replacement of up to 50% of heat requirements with tyre chips. A 79-page trial report has been sent to the EA for detailed analysis before it decides whether to give permanent permission for the use of tyre chips at Tunstead. The very high temperatures, long combustion times and excess air in the cement kiln ensure complete combustion of the tyre chips in the process, so there is no black smoke or smell. Image: Tarmac Buxton Lime and Cement fuels development manager Hasan Bobat and Credential Environmentals Tracy Payne pictured alongside the tyre chip conveyor at Tunstead Quarry, near Buxton.

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