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Management of By-Products from IGCC Power Generation

AUTHOR: Lee B. Clarke
DATE: May 1991

This report assesses current developments in the management of by-products from IGCC power generation. The sources of residues and other by-products in the different streams from IGCC processes are summarised. Variations in the chemical, physical, and geotechnical characteristics of the residues are examined with a view to optimising disposal or utilisation.

Legislation and leaching tests used in different countries are compared, and disposal practices discussed. The leaching characteristics of various IGCC residues are examined. Most residues can be classified as non-hazardous wastes under present regulations. Landfill currently provides a simple way of disposing of most gasification residues, but in future dumping may be unacceptable. Possible applications for by-products from IGCC power generation include uses in agriculture, in building and structural materials, as industrial materials, and for materials recovery. Bonded applications, which afford the greatest protection to the environment against leaching of metals, are preferred in some countries.

The successful management of IGCC residues requires detailed understanding of the nature and quantity of the waste products, knowledge of the legislative constraints that control the use and disposal of waste products and their leachates, and optimal disposal and utilisation methods in order to minimise environmental impact.