LCA and LCC Evaluation of recycling systems of waste plastics

由于塑料在我们的社会中被广泛使用，围绕塑料废物的问题已经成为现代社会废物处理和回收讨论的一个典型和象征性的部分。最紧迫的问题是退出大规模生产、大规模消费、大规模浪费的经济体系，创造一个循环型社会。传统的垃圾处理系统暴露出许多问题，如难以找到焚化炉残留物的最终处置地点，以及如何回收废物的问题。为了解决这类问题，已经开发了一些新技术，包括灰熔化和气化熔化。废塑料资源回收系统的发展，包括高炉反应，焦炉化学原料制备，液化，气化和材料回收。本研究采用生命周期评估法（LCA）和生命周期成本法（LCC）确定环境影响和成本。在2006年，我们选择了用于垃圾焚烧的具有代表性的灰熔化和气化熔化方法，并通过LCA和LCC确定了环境成本和成本。由此可见，无论产生多少废弃物，粉煤灰熔融系统在环境效益和成本上都优于气化熔融系统。2007年，对废塑料资源化利用系统的高炉反应、焦炉化工原料制备、液化、气化、物料回收等几种方法进行了选择，并对其环保量和成本进行了评价。结果表明，气化法是废塑料资源化利用的最佳途径。气化法虽然耗电量很大，但回收了资源。进一步气化法效率高。

Since plastics are used throughout our societies, the issues surrounding plastic waste have become a typical and symbolic part of the discussion on waste treatment and recycling in a modern society. The most pressing issue is to withdraw from a mass production, mass consumption, mass waste economic system and to create a recycling oriented society. Waste disposal system conventionally reveals many problems, like the difficulty of finding final disposal sites for incinerator residues and the issue of how to recycle waste materials. Some new technologies have been developed to solve these kinds of problems, including ash melting and gasification melting. Resource recycling systems of waste plastics have been developed to explain these kinds of issues, including blast furnace reaction, coke-oven chemical raw material preparation, liquefaction, gasification and material recycling. In this study, environmental impact and costs were determined using Life Cycle Assessment (LCA) and Life Cycle Cost (LCC).In 2006, we selected representative methods used for ash melting and gasification melting that are used for waste incineration, and determined the amount of environmental lord and costs by LCA and LCC. As a result, it was clear that ash melting system excelled rather than gasification melting system both environmental mad and costs, regardless of amount of waste.In 2007, we chosen some methods worked for blast furnace reaction, coke-oven chemical raw material preparation, liquefaction, gasification and material recycling which are worked for resource recycling systems of waste plastics, and evaluated the amount of environmental lord and costs. As a result, it was found that gasification method is the best resource recycling system of waste plastics. Although gasification method has very high electricity consumption, this method retrieves the resources. Further gasification method is highly efficient.