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ECN publication
Prediction of the leaching behaviour of waste mixtures by chemical speciation modelling based on a limited set of key parameters
Published by: Publication date:
ECN 1-10-2005
ECN report number: Document type:
ECN-RX--05-164 Conference Paper
Number of pages: Full text:
14 Download PDF  

Presented at: Sardinia 2005, Tenth International waste management and landfill symposium, Sardinia, Italy, 3-7 oktober 2005.

In previous work on a predominantly inorganic waste landfill, carried out in the framework of developing sustainable landfill concepts, detailed information on the leaching behaviour of the wastes submitted for landfilling was obtained. Chemical speciation modelling of the eluate composition obtained from testing the waste mix in a laboratory column leaching test (0.0005 m3) and of the leachates obtained from the lysimeter (1.5 m3) and field scale studies (12,000 m3 pilot cell) on the same waste mix with ORCHESTRA embedded in the database/expert system LeachXS, is showing a rather good agreement between modelling results on major, minor and trace elements and actual measurement. A limited set of input parameters consisting of element availabilities, relevant parameters for sub-models on adsorption to iron oxides, clay, particulate and dissolved organic matter and a selective set of minerals provides a revealing partitioning between dissolved and particulate phases. Apart from describing the release behaviour in the pH dependence-leaching test adequately, this information is most relevant for assessing changes in each of release controlling properties (element availabilities, amount of sorptive surfaces and redox). This type of modelling allows prediction of changes in leachate quality as a result of waste input as this may cause a change in element availability and quantity of sorptive surfaces. A few of such possible changes have been modelled. This type of modelling provides the potential for development of more sophisticated acceptance criteria as well as possibilities to assess the level of aftercare measures needed at the time of landfill closure.

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