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TREATING POLLUTED LAND WITH CARBON DIOXIDE

November 25, 1999

First a granular binder containing products which react with carbon is added to the contaminated soil and then carbon dioxide is pumped into the mixture. The three components rapidly combine to produce a cement that is very stable, and although marginally more expensive is immediately available for development. The land can then be used for housing or for other developments more quickly, thereby reducing overall costs and the need to build on greenfield sites.

The reaction that takes place mimics the natural process which sees a more gradual take up of carbon dioxide. Heavy metal contaminants that can originate from, for example, industrial and other commercial activities form as insoluble salts and are trapped inside the cement. Tests showed that the leaching of contaminants was dramatically reduced, for example, there was a 85-98% reduction in zinc, copper and lead. Similar reductions in cadmium, chromium and mercury have also been observed.

Dr Hills who is based at the Medway University Campus explains: "As a by-product of the process there is also the potential to recycle large quantities of the greenhouse gas, carbon dioxide, rather than release it into the atmosphere."

The process can be used on its own or to complement existing ground treatment techniques. The technology is currently at development stage and a pilot project is planned shortly. An industrial
consortium is being formed to bring the technology to the market and it is hoped that the process will be commercially available in about 12 months.

Greenwich, University of

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