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Study of the wood ash stabilization by treatment with CO2 under various conditions

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  • Univerzitetni Program Vodarstvo In Komunalno Inženirstvo
  • Agricultural Science
  • Biology
  • Ecology
  • Geography


Wood ash is a high quality waste that is generated by thermal utilization of fresh and waste wood. The material is too valuable to waste it. Ashes are often found unsuitable for disposal at landfills or for direct application due to their fine powder consistency, high content of soluble substances, unburned carbon fraction or their high alkalinity. With relatively simple procedures they can be processed to a form suitable for utilization or disposal. These processes are: spontaneous or forced carbonization, granulation, preparation of artificial soil or their integration into other complementary waste like compost and sewage sludge. Options of handling wood ashes are represented in this study. At first the treatment of waste wood ashes in Slovenia and Europe has been reviewed. In the experimental part an attempt of stabilization of wood ash by means of spontaneous or forced carbonization has been studied.on two fresh industrial ash samples. End products from the ash sample P2 has quality characteristics that allow its use in various areas. It can be used in forests ecosystems, landfill construction (top covering layers), for covering mine tailings, geotechnical uses or for fertilization in agriculture and improvement of acidic soils, which allows mineral structure and the corresponding pH of these products. The ash sample P1 was more difficult to process. After the carbonatization process some parameters were above limit values. For more environmentally demanding ashes - according to the latest studies - carbonatization taking longer time periods should be implemented using pre-wetted samples to get acceptable product quality characteristics.

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