Trash ash from incinerators can be used to generate clean hydrogen gas while becoming a building material.
April 29, 2026
Original Paper
Treatment of Municipal Solid Waste Incineration Bottom Ash using Cement for Integrated Recovery of Hydrogen and Production of Supplementary Cementitious Material
SSRN · 6664864
The Takeaway
Incinerating municipal waste leaves behind a bottom ash that usually ends up in landfills. This new treatment uses low-cost cement to process the ash and trigger the release of hydrogen gas. The process not only captures a high-value clean energy source but also stabilizes the ash for use in construction. The resulting material is a viable replacement for traditional cement, reducing the carbon footprint of building projects. This approach turns a waste stream into a dual-purpose resource for energy and infrastructure.
From the abstract
Municipal solid waste incineration (MSWI) bottom ash (MBA) represents both a disposal challenge and a potential resource for sustainable construction materials, especially as a supplementary cementitious material (SCM). However, the conventional use of MBA in cement-based materials is hindered by its high metallic aluminum content, which reacts in alkaline environments to release hydrogen gas and causes volumetric instability (e.g., expansion and cracking). This study introduces an innovative, s