Abstract
Over recent years, European cities have been questioning their traditional pre-sorting and waste collection practices and looking for new schemes to improve environmental problems generated by waste disposal. This paper presents an integral methodology for four pre-sorting practices that are beginning to be implemented in Spanish cities. A great effort has been made to compile information to be able to estimate a large number of valuation indexes. Based on this information, the methodology is supported by the forecasting of waste generation, the use of GIS techniques, the definition of objectives and their evaluation taking into account legal, social, performance, environmental and economic issues. Special attention is given to environmental impact, for which life cycle assessment methodology is used.
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