Landfill
Until a few years ago the most common method of disposing of waste tyres was to dump them in landfills.
But this is not very desirable neither for environmental nor economic reasons.
First of all the ELTs decompose very slowly in nature, secondly they pose a fire risk as well as a health risk (e.g. potential malaria threat due to mosquito nesting). Thirdly they take up a lot of space, which is uneconomic.
In addition, landfilling leads to the loss of a resource that could have been used much more efficiently.