| With the rapid development of urbanization and improvement in living standards of citizens, the demand for a high level of sanitary environment is gathering momentum. As a main subject area of Environmental pollution control, the control of MSW (Municipal solid waste) pollution has been a research concern world around. In the research field of MSW pollution control, lots of researches and research establishments take their research focus on the optimization of MSW transportation and treatment system, which is a complex system engineering containing plenty of technical procedures and management links. It should be take kinds of impact fact such as region features, technical options, socioeconomic conditions and environment concern into consideration when making a sound and reasonable strategy of planning the MSW transportation and treatment. Most of the time, researches willing to focus on the optimization of MSW transportation and treatment system in the city region, which have greatly contributed to the improvement of sanitary environment in the city. In recent years, as MSW pollution mounts up in rural area, some research switched their attention on the treatment of rural MSW. However, for some special region that environmentally sensitive and should deserved more attention, there is little interest from researches on them. What’s more, with the fast development of tourism, the environmental pressure tourist area faced is increasing. Now in this paper, A multi-objective optimization research on the MSW transportation and treatment system in tourist area, especially mountain scenic, is conducted.From various aspects such as waste generation and distribution, transportation and disposal, this research thoroughly analyzed the features of geographic characteristics, social environment in mountain scenic area and the impact them posed on the MSW transportation and treatment system. According to the main structure and defect of general MSW transportation system, the paper constructed and discussed a new type of MSW transportation system in mountain scenic area that based on cableway transportation. A further discuss about the optimization is taken--an nonlinear mathematics model aiming at optimizing the transportation and treatment system was constructed, under a number of constraints from economic, environmental and social aspects. In this model, LCA (Life Cycle Assessment, LCA) was applied to construct a multi-objective multi-step decision-making system for MSW transportation and treatment with the optimization model mentioned before in mountain scenic.The proposed multi-objective multi-step decision-making system was applied in a case study. MSW transportation and treatment system in Huangshan mountain scenic area was chosen as the research target.Firstly, as a valid environmental assessment tool, LCA was used to evaluate the environmental impact of MSW transportation and treatment system in Huangshan mountain scenic, life cycle analysis inventory was established, and environment impact analysis was conducted for each phrase of the system. Secondly, the research result of LCA was taken as an environment reference to help to construct a multi-objective optimization model simulating MSW transportation and treatment system in Huangshan mountain scenic, genetic algorithm was used as model solver, resulting three MSW transportation and treatment schemes according to three different preferences. By analyzing the advantages and disadvantages of the three scheme, an optimized scheme was proposed. In this scheme, there were two types of facilities for MSW collection, namely level-one transportation station and cableway MSW station, the existing of whom indicating a multi-layer level-first transportation model, in the level-second transportation, cableway was used as a new tool for the transportation of the MSW, a total of2transfer station and3cableway station were placed in service in the transfer system. The optimized object values of economic, environmental and social in the proposed scheme that involved cableway were1400.06,298.04,4.94e+07, which was reduced by23.1%,55.8%,19.8%, when compared to the original human transportation system. In addition, the siting and scale of transportation station and cableway MSW station as well as staffing issues were confirmed. Lastly, for the MSW transportation and treatment system optimized, its total environment impact was analyzed, the result of which was used as references to further optimized the system by giving some operational suggestions.The research resultof this paper suggested that, it is reasonable and sound to apply the new model that involved cableway in the transportation of MSW to the mountain scenic area. It also indicated that the multi-object and multi-step decision-making method proposed for the MSW transportation and treatment system in mountain scenic area could act as an effective guideline in the decision making of MSW management in such special area, as well as balancing the interest of economic, environmental and social aspect, whichalso has considerably both theoretical and practical significance to the similar problems. |
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