This research delves into the implementation of homogenization techniques through crane operations over an extended period in waste pits at general waste incineration facilities. It focuses on utilization of the stoker method for this scenario. Homogenization, achieved through the agitation or scattering of waste materials within the pits, has emerged as a pivotal factor for ensuring the stabilization of the combustion processes within the furnace. The resultant combustion stability plays a dual role: facilitating a steady flow of main steam for power generation and curbing maintenance expenses.
　Given the intricate challenges associated with conducting prolonged real-world validations within general waste incineration facilities, we opted for a discrete-event system simulation as a substitute for using tangible equipment. This approach serves to confirm the efficacy of homogenization effects.
　The procedures of waste agitation and scattering were meticulously simulated and scrutinized over a 31-day span. The findings unveiled that scattering enabled the controlled introduction of homogenized waste into the furnace, yielding results closely aligned with the established Target calorific value. In contrast, when we compared the crane operations, scattering demanded a greater number of tasks tied to homogenization and waste transfer, aiming to mitigate disparities in elevation. This comparative analysis offered valuable insights into optimizing crane operational efficiency.

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Since the mid-2010s, plastic resource circulation has entered a new phase due to the increase in marine plastics and other factors, with many countries now taking actions to address this issue. In this paper, we compare the responses of two non-EU developed countries, the UK and Japan, from the perspective of EPR (Extended Producer Responsibility). We also discuss the differences and meanings surrounding both of their responses. The research method used classifies the changes seen after the introduction of new policies in both countries, looking into three aspects: physical, financial, and informational. Each of these is then analyzed in four stages: collection, recycling, appropriate treatment, and product design. The results show clear differences between the two countries: The UK has been strengthening producer responsibility through a combination of physical, financial, and informational policy measures. By contrast, Japan has not adopted a financial approach, but focuses on voluntary efforts, with the goal that each actor in the product chain (production, distribution/sales, use, and recycling) will work together to fulfill their respective roles. Future studies are needed to examine the causes behind the different responses between the two, as well as to demonstrate the policy effects.

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