Life Cycle Assessment of Hydrogen Recovery System from General Waste Incineration Bottom Ash

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  • 一般廃棄物焼却灰からの水素回収システムに関するライフサイクルアセスメント

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<p>It is known that in waste treatment, hydrogen gas is generated by the reaction of metallic Al contained in incineration ash and water under high alkaline conditions. A life cycle assessment (LCA) of a hydrogen gas recovery system was conducted with the aim of recovering and effectively utilizing this hydrogen gas. Specifically, the life cycle cost (LCC) and LC-CO2 emissions of the hydrogen gas recovery system were evaluated for the western Fukuoka City waste incineration plant, the functional unit of hydrogen gas was 1Nm3, and the system boundary was from the hydrogen generation stage to the storage and transportation stages. The LCC was calculated for several cases based on the use application and the amount of hydrogen generated per ton of incinerated ash. The unit cost of hydrogen production was higher than the market price in the case of fuel cell use and synthetic methane use with a hydrogen production rate of 11.4 m3/t-ash per ton of incinerated ash, but was lower than the market price when the hydrogen production efficiency increased to 50 m3/t-ash. LC-CO2 was lower than that of the case using water electrolysis hydrogen derived from green hydrogen under the same conditions.</p>

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