Study On Hazardous Waste Logistics Location Routing Problem Model Based On Multi-objective Programming

In the past two decades, human has began to aware of enviromental problem and their activities has affected enviroment. In particular, the risk of hazardous waste transportion and disposal process has attracted the public's eyes. Therefore, in order to reduce the accident consequence, the hazardous waste disposal sites should be located in the less population area. In addition, in order to reduce transportation risk, it needs to select safer route from hazardous waste generation point to disposal facilities. However, the location of hazardous waste disposal facilities may affect the determination of route and even affect the entire transportation risk. Thus, the hazardous waste facilities location and routing are interrelated, it needs to integrate this two aspects. Considered on the above reasons, this paper researches on the combined location and routing problem of hazardous waste logistics(HWLRP), in order to enrich and improve the logistics system theory and methods, and provide a theoritical basis for the government's scientific decision-making.On the basis of the previous related work of hazardous waste location routing problem(HWLRP) and considered the real problem of hazardous waste management, this paper applies multi-objective planning theory, system theory and modern intelligent algorithm, adopts theoretical methodology combined with practical methodology, quantity methodology combined with qualitative methodology, discusses the hazardous waste logistics location routing problem. The contents are divided into three parts.The first part is literature review. Many literature related with the research topic are searched and sorted out, including logistics location-allocation problem, vehicle routing problem, location-routing problem, hazardous waste logistics location-routing problem and hazardous waste risk assessment. The author has mastered the actuality and dynamic of the research and this will be the basement of the following research;The second part is the main part of the thesis. First, it evaluates the risk of hazardous waste logistics, including hazardous waste transportation risk assessment and hazardous waste disposal facility risk assessment, then it gives the total risk formula to calculate the transportation risk and gives an example to verify it. It also proposes the fuzzy comprehensive evaluation method to assess the facility risk. Second, based on the elaboration of integrated logistics management system theory, portfolio optimization theory and related issue of LRP, the author establishes the mathematical model of capacitated, time limited, stochastic and multi-depot location-routing problem, designs a tabu search and ant colony system approach for the problem,and then gives an example to illustrate the application of model and algorithm. At last, considered the characteristics of hazardous waste, it establishes the mathematical model of hazardous waste logistics location-routing problem which is different from location-routing problem, and continues to apply the tabu search and ant colony system algorithm to solve the HWLRP, gives an example to illustrate the model and algorithm's effectiveness.The third part id the conclusion and the prospect of future research. Based on the conclusion of the thesis, the innovation and limitation of the research is pointed out, and the prospect of future research is put forward.All conclusion from the thesis is a valuable supplement for the existing logistics system planning theory and methods. All the models in the thesis can give guidance for the actual environmental protection work, and provide a theoritical basis for the government's scientific decision-making. The research has its theoretical and practice meaning.