Abstract
This paper sheds light on the increase in generation of non-metallic mineral wastes and the decrease in demand for construction by investigating the material flow resulting from and the economic influence of changes in the supply and demand for wastes, focusing on the period from the near future to 2030. We predict the amount of final disposal of non-metallic mineral wastes and its influence on industries in the future under the assumption of two scenarios—zero emission and business-as-usual—using linear programming and input–output techniques developed for non-metallic mineral materials. We conclude that zero emission can be achieved at the cost of a 3.76% decrease in the value added of industries related to non-metallic mineral wastes. Otherwise, the final disposal might increase 13 times the size of 2005’s disposal. Considering the empirical results, we discuss an effective policy for non-metallic mineral waste management from the viewpoints of material flow and economic influence.
Highlights
Rubble, slag, and sludge, referred to as non-metallic mineral wastes, are frequently recycled as alternate materials for natural non-metallic mineral resources such as dirt, crushed stone, sand, and clay
Concrete waste and asphalt generated from demolishing structures and repairing roads, respectively, are non-metallic mineral wastes derived from the demolition of existing stock
The demand has begun to decrease due to the saturation of social infrastructures. This phenomenon leads to the collapse of the balance of supply and demand in nonmetallic mineral wastes, which increases the amount of final disposal
Summary
Slag, and sludge, referred to as non-metallic mineral wastes, are frequently recycled as alternate materials for natural non-metallic mineral resources such as dirt, crushed stone, sand, and clay. On the supply side, considering the generation of non-metallic mineral wastes in the future in Japan, it is expected that concrete waste will continuously and drastically increase. This phenomenon leads to the collapse of the balance of supply and demand in nonmetallic mineral wastes, which increases the amount of final disposal While this phenomenon has already been detected in Japan, there is a high possibility that other Asian countries, which have achieved high economic growth, will face a similar one in the future. Based on the circumstances described above, this paper, considering the case of Japan, investigates the material flow resulting from and the economic influence of the changes in supply and demand for non-metallic mineral wastes, focusing on the period from the near future to 2030.
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