Siting MSW landfills on Lesvos island with a GIS-based methodology.

Department of Environmental Studies, University of the Aegean, Mytilene, Lesvos, Greece.
Waste Management & Research (Impact Factor: 1.11). 07/2003; 21(3):262-77. DOI: 10.1177/0734242X0302100310
Source: PubMed

ABSTRACT The siting of Municipal Solid Waste (MSW) landfills in Greece is a difficult process due to land resource limitations, the country's mountainous, insular and primarily water permeable terrain as well as an exacerbated public opposition (NIMBY syndrome). A GIS-based methodology is presented here with the goal to identify and rank the candidate landfill sites for the entire island of Lesvos. The initial step of the methodology comprises a GIS-based spatial analysis that uses 10 criteria, by excluding all areas unsuitable for any waste disposal activity. The pre-selected areas are then further assessed by fieldwork and candidate landfill sites are determined. The candidate sites are ranked using 19 criteria with predefined weight coefficients on a 0 to 10 grading scale. The weight coefficients are estimated for each criterion using the Analytic Hierarchy Process (AHP), while the grading scheme is based on pre-defined guidelines. An overall suitability index is produced for each candidate site allowing comparison and best case selection. A case study for the island of Lesvos is presented here, in which eight candidate landfill sites were finally selected and ranked. Social factors highly determined the ultimate selection of the site in Lesvos, since the third rather than the first site suggested by the methodology, was finally approved by local authorities.

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    ABSTRACT: The procedure of a multi-criteria decision analysis supported by the geographic information systems was applied to the site selection process of a planning municipal solid waste management practice based on twelve different scenarios. The scenarios included two different decision tree modes and two different weighting models for three different area requirements. The suitability rankings of the suitable sites obtained from the application of the decision procedure for the scenarios were assessed by a factorial experimental design concerning the effect of some external criteria on the final decision of the site selection process. The external criteria used in the factorial experimental design were defined as "Risk perception and approval of stakeholders" and "Visibility". The effects of the presence of these criteria in the decision trees were evaluated in detail. For a quantitative expression of the differentiations observed in the suitability rankings, the ranking data were subjected to ANOVA test after a normalization process. Then the results of these tests were evaluated by Tukey test to measure the effects of external criteria on the final decision. The results of Tukey tests indicated that the involvement of the external criteria into the decision trees produced statistically meaningful differentiations in the suitability rankings. Since the external criteria could cause considerable external costs during the operation of the disposal facilities, the presence of these criteria in the decision tree in addition to the other criteria related to environmental and legislative requisites could prevent subsequent external costs in the first place.
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    ABSTRACT: Site selection of new landfills for municipal solid waste (MSW) disposal is a great concern of urban governments around the world as old landfill sites are being filled-up and demand for new sites is increasing. Finding a suitable MSW disposal site of adequate size meeting all the regulations is a costly endeavor. With the advent of geographic information systems (GIS) and its decision support tools, preliminary screening and prospective site selection can be done effectively with high degree of accuracy. In this paper landfill demand for disposal of MSW of Dhaka, the capital of Bangladesh is assessed by projecting population and waste generation for the period 2007-2025. A spreadsheet modeling is done for the assessment of area requirement for landfill demand using waste generation rate and population growth rate. Several waste management scenarios is considered in assessing of waste generation and landfill demand. For finding suitable landfill sites, a multi-criteria evaluation (MCE) on various raster map layers is done in GIS environment. Various map layers of Dhaka city (1734 km 2) is prepared using standard exclusionary criteria. Map layers are then overlaid and combined using weighted linear combination (WLC) method. In the suitability analysis for weighting of factors a pair-wise comparison method provided by the analytic hierarchy process (AHP) is used which is built-in the GIS environment. Suitable areas further masked out for being small size or discontinuity of land parcel. Finally suitable land parcel is ranked with size in descending order as larger sizes are more suitable than smaller sizes for landfill development. The paper presents three scenarios for available suitable lands by changing relative importance factors.


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May 21, 2014