ECN publication
Similarities in the long term leaching behaviour of predominantly inorganic waste, MSWI bottom ash, degraded MSW and bioreactor residues
Sloot, H.A. van der; Rietra, R.P.J.J.; Vroon, R.C.; Scharff, H.; Woelders, J.A.
Published by: Publication date:
ECN 1-7-2001
ECN report number: Document type:
ECN-RX--01-044 Conference Paper
Number of pages: Full text:
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Presented at: 8th International Waste Management and Landfill Symposium, S. Margherita di Pula Cagliari Sardinia, Italy, 1-5 oktober 2001.

There is a strong desire to reduce the need for long term aftercare measures inlandfill operation. This requires more knowledge of the processes within the landfill and the factors influencing leachate quality. New methods have become available through standardisation in CEN TC 292 that provide such more detailed characterisation. In separate studies on different types of landfilled waste, a combination of laboratory leaching tests, lysimeter studies and field scale measurements were carried out. The comparison of these different types of landfilled waste, such as predominantly inorganic waste, partially degraded Municipal Solid Wasted (MSW), municipal solid waste incinerator bottom ash (MSWI BA) and the rest product of degradation of mechanically separated organic waste (MSOR) in a Bioreactor, has revealed that the end point to which all of these 'mixed' materials converge is very much the same in terms of their long term leaching behaviour. The end pH is a neutral pH due to the pH buffering imposed by calcite and the almost non-degradable residual organic matter. The leaching behaviour in all of these 'mixed' materials proves to be dominated for many constituents by dissolved organic carbon (DOC) similar to topsoil?s. The results suggest that DOC measured at neutral pH can be used as a measure to assess the status of degradability by comparing measured DOC release levels to a reference data set. It appears that DOC levels as observed for topsoils can be used as a reference for final storage quality.

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