NEW CONCEPT FOR LANDFILL DISPOSAL OF MUNICIPAL SOLID WASTE INCINERATION RESIDUES

The major environmental concerns in relation to the short- and long-term impact of landfilling of municipal solid waste incineration (MSWI) residues are connected with the risk of leaching and subsequent release of potentially harmful substances, particularly inorganic salts and metals trace elements, into the environment (soil, water, air). Landfill solid residues disposal of fired coal power plants have to deal with the same risks regarding the leaching. Suitable solutions to minimise disposal leaching were developed, and presently the dense slurry technology was developed. The final product of this modern technology is the 'ash rock' resulted from the cementation chemical reactions of the calcium compounds contained in solid residues from coal incineration. Landfill disposal created by this way offers best conditions for avoiding the leaching to environment of the harmful elements contained in fired coal solid residues. Also an improved disposal stability and aftercare period of disposal are relevant. In order to find a novel, possible solution for the MSWI ash disposal, a combination with the dense slurry technology, applied on fired coal residues, is proposed. Based on this aspect, it would be possible to combine those 2 types of residues with dense slurry technology, to create new compounds similar with ash rock. The present study relates to research and analyse results accomplished on a small scale, using laboratory facilities in order to create a novel type of ash rock encapsulating the MSWI solid residues into dense slurry resulted from solid fossil fuel combustion. Concluding remarks in reference to the main factors of influence are expressed as well. The presented solution is totally new and might open a wide range of interest of the industrial waste incinerating industry.