Abstract
This research aims to evaluate the sustainability of alkali-activated binders for the stabilization/solidification (S/S) of municipal solid waste incineration fly ash (MSWI FA). A detailed environmental assessment of different alkali-activated mixtures was conducted using life cycle assessment (LCA) to identify the factors affecting their environmental burden. Ground granulated blast-furnace slag (GGBS) and metakaolin (MK) were used as the precursors. Results showed that all the alkali-activated blocks fulfilled the requirements for landfill and reuse as fill materials. Adopting alkali activation for S/S of MSWI FA instead of OPC allowed up to 70% reduction of global warming potential. However, in other impact categories such as human toxicity and land use, the alkali mixtures recorded higher values than the mix with OPC (+60–70%), primarily because of the impacts related to the production of chemical activators. The sensitivity analysis demonstrated that alternative production methods for sodium silicate and sodium hydroxide could enormously reduce the impacts related to the alkali solution. When the hydrothermal method for sodium silicate and the ODC method for sodium hydroxide were adopted, a reduction of 71%, 22%, and 24% was recorded in global warming potential, fossil resource scarcity, and human toxicity categories, respectively, compared with the mix with OPC. Therefore, this study sheds light on alkali-activated materials as sustainable S/S alternative to OPC for hazardous waste management to promote carbon neutrality.
Original language | English |
---|---|
Article number | 134963 |
Journal | Journal of Cleaner Production |
Volume | 380 |
DOIs | |
Publication status | Published - 20 Dec 2022 |
Keywords
- Clinker-free treatment
- Hazardous waste management
- Incineration ash
- Low carbon binder
- Supplementary cementitious materials
- Sustainable remediation
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Building and Construction
- General Environmental Science
- Strategy and Management
- Industrial and Manufacturing Engineering