Abstract
Japan’s declining population has caused changes in the amount and characteristics of municipal waste. In order to optimize waste incineration plants as a countermeasure to this problem, we analyzed the performance of the integration of the plants with the Mechanical Biological Treatment (MBT) system. In the integrated system, food waste and sewage sludge from waste incineration plants, sewage treatment plants, and industrial facilities were mixed and fermented to produce methane gas. In this study, we evaluated the environmental and economic performance of the integrated system in four case scenarios. The integrated system is located in Ichihara City in Chiba Prefecture, where the Keiyo Coastal Industrial Zone is located and where petroleum and chemical industries are concentrated. The MBT system in which the heat generated from the incineration of waste was transferred to the Keiyo Coastal Industrial Zone was found to be the best. This method could reduce CO2 emissions by 1341 t-CO2/Y, and the annual cost was the lowest at 1.60 billion yen/Y. However, the results of the sensitivity analysis of the food waste ratio and the piping distance suggested that it may be impossible to obtain appropriate evaluation results without considering the regional characteristics.
Highlights
The population of Japan is declining, and the population gap between rural and urban areas has become a social problem
Maki et al has evaluated the steam supply potential from the waste treatment field to the industrial world, and the results showed the potential of Aichi Prefecture, Japan, in 2021, but this study was an evaluation of Ichihara City, Chiba Prefecture, which was different from Aichi Prefecture, and was considered for the construction of an industrial use model of waste energy in
We evaluated CO2 emissions and the economic efficiency of introducing the Mechanical Biological Treatment (MBT)
Summary
The population of Japan is declining, and the population gap between rural and urban areas has become a social problem. The population is concentrated in big cities such as Tokyo, Nagoya, and Osaka, and the rural population is declining [1]. In March 2019, the Ministry of the Environment’s “Wider area of waste treatment and integration of waste treatment facility to ensure sustainable proper treatment”, presented six methods for widening and integrating waste treatment facilities [2]. This notification established a waste treatment union, stating the necessity to carry out waste treatment in a wide area and promote the integration of waste treatment functions in cooperation with other infrastructures
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