Investigations into the landfill behaviour of pretreated wastes

Mechanical–biological treatment of municipal solid waste has become popular throughout the UK and other parts of Europe to enable compliance with the Landfill Directive. Pretreatment will have a major influence on the degradation and settlement characteristics of the waste in landfills owing to the changes in the composition and properties of the wastes. This paper presents and compares the results of long term landfill behaviour of the UK and German MBT wastes pretreated to different standards. The gas generating potential, leachate quality and settlement characteristics are highlighted. The results reveal that it is possible to achieve stabilisation of MBT waste within a year and the biogas yield and leachate strength of German MBT waste was significantly reduced compared with the UK MBT waste. The settlement resulting from mechanical creep is more significant than the biodegradation induced settlement in both cases.

► Waste stabilisation was achieved in less than a year under enhanced.
► biodegradation conditions.
► Leaching of TOC and NH4-N is less from the German MBT waste than from the UK MBT waste.
► Secondary settlement due to mechanical creep was more significant than that due to biodegradation.
► The relationship between settlement and biogas volume produced is approximately linear.