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Utilization of Treated Solid Waste Combustion Residues in Reconstruction and Vertical Air Space Extension of Landfills

In this contribution, the utilization of processed MSWI - combustion residues (i.e. bottom ash & slags) for the reconstruction of landfi lls during vertical expansion of airspace is reported. It is shown, that from 250 kg/tonMSW bottom ash generated during combustion, 6 - 7 % FE-metals, 1 - 2 % NON-FE metals and over 90 % minerals (mainly a mixture of CaO, Al2O3, Fe2O3, and Silicates) can be recovered in a processing plant. Using the so called 'Concrete Stabilized Perimeter Berm' method, where parts of the mineral fraction are mixed with cement, sand and water to form concrete for slope construction during the vertical airspace expansion, slope steepening from 1(V): 3 (H) to 2(V) : 3 (H) with simultaneous increase of landfill height from 30 m-45m can be achieved, resulting in airspace gaining.

Landfill airspace is defined as the space volume on a landfill site which is permitted by authorities for the disposal of waste, in the present case municipal solid waste (MSW). Hence it represents alimited and valuable resource to be sustainably and economically used by proper airspace management. It can be expected, that a landfi ll sooner or later will run out of its design capacity. Comparedto prospection, selection and construction of a new site, a vertical expansion of an existinglandfill, within the original footprint, provides an economical as well as sustainable solution to solve capacity problems in solid waste disposal. Vertical landfill airspace expansion, also calledthe 'piggyback approach� (Law et al. 2013) means constructing a new landfill atop of one that is already closed or scheduled to be closed soon at a previously-permitted site.

Copyright:	© Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben
Quelle:	Depotech 2014 (November 2014)
Seiten:	6
Preis:	€ 3,00
Autor:	Dipl.-Ing. Dr. mont. Renato Sarc Em.o.Univ.-Prof. Dr.-Ing. Karl E. Lorber Dipl.-Ing. Dr.mont MScTox Klaus Werner Wruss Karl Reiselhuber
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