Construction of IT network of non-utilized materials for local community with material circulatory function

为了实现可持续发展的社会系统，社区必须构建产业间的物质循环网络。在这方面，工业产生的废物被定义为未使用的材料。本研究发展一种在不同产业间建构可再利用材料循环网路的方法。通过工业调查建立了两类数据库。其中一个数据库显示了有关一个主题社区的每个工业公司接收或排放的原材料、产品和废物的信息。第二个数据库界定了能够将废物转化为可再利用材料的转化技术。以这些数据库为基础，通过网络模拟程序对社区的物质流进行了分析，并以爱知县丰桥市为例进行了验证。首先，建立了工业、废物处理公司和废物转化技术的数据库。为了提出一个合理的物流网络实例，本文采用网络模拟器对物流进行了分析，主要分为以下三个步骤。在分析过程中，以区域排放的物质量为指标，对各网络进行了评价。（1）分析了同一行业内各企业之间的物质循环网络。（2）对最优网络进行修正，确定了整个行业的投入产出量。（3）分析了不同行业之间的物质循环网络。最后，提出了一个假设的不同行业之间的最优物质循环网络。使该地区的物质排放量减少到10，899吨原材料，8，666吨产品和2，233吨废物。此外，还对数据库的扩充方法进行了预测和描述。

In order to realize asocial system with sustainable development, it is necessary for local communities to construct inter-industries material circulatory network. In this aspect, wastes evolving from the industries are defined as unused materials. This study develops a methodology of constructing circulatory networks among different industries for reusable materials. Two types of databases are made by means of industrial surveys. One of the databases reveals information about raw materials, products and wastes, received from or emitted to each company of industries in a subject community. The second database defines conversion technologies that enable transformation of wastes into reusable materials. Based on these databases, material flows in the community are analyzed by a network simulator program.In this study, the methodology is tested on application to Toyohashi city in Aichi Prefecture. First of all, the databases of the industries, wastes treatment companies and waste conversion technologies were prepared. In order to propose one example of proper material circulatory network, the material flow, was analyzed by the Network Simulator based on following 3 steps. In this analysis, each network was evaluated in terms of amount of materials that were emitted from the region.i)Analyzing material circulatory networks among companies in the same industry.ii)Correcting the best network, and defining the I-O amounts as whole of the industry.iii)Analyzing material circulatory networks among different industries.As a results, an optimum hypothetical material circulatory network among different industries is proposed, which enable" to reduction of the amount of material emission from the region accounting to 10,899 ton of raw material, 8,666 ton of products, and 2,233 ton of wastes. Moreover, upscale method of the database is also predicted and described.