Abstract
The liming of waste is supposed to stop biodegradation and reduce the impacts of landfilling activity. The efficiency of liming was tested both in laboratory conditions and in field- scale conditions. The leachates of reconstituted waste in lysimeters in laboratory conditions were followed during forty weeks, and two field-scale lysimeters filled with raw waste were followed during two years. The results show that lime does not stop the biodegradation of raw waste and the leachates produced by the limed waste exhibit the same microbiological and physico-chemical characteristics as the leachates produced by the reference waste. Nevertheless, when lime is applied to waste with a granulometry under two centimetres, the biodegradation is stopped as long as the alka linization is effective. The conclusion is that the liming pro cess in the case of raw waste is not appropriate and can only be used in the case of industrial crushed or organic waste with a granulometry of under few centimetres in diameter.
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