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Fly ash with high sulphate and chloride content: solidification and stabilisation using hydraulic lime
Pietro Ubbrìaco1, Paolo Bruno, Angela Traini
1Dipartimento di Ingegneria Civile e Ambientale, Politecnico di Bari, Via Orabona 4, 70125 Bari, Italy. p.ubbriaco@poliba.it
Annali Di Chimica
|November 1, 2002
Summary
This study shows that lime-pozzolan binders effectively solidify Municipal Solid Waste (MSW) fly ash, immobilizing heavy metals and pollutants. Pollutant leaching significantly decreases over time, making it a viable waste treatment method.
Area of Science:
- Environmental Science
- Geochemistry
- Materials Science
Background:
- Municipal Solid Waste (MSW) fly ash often contains high levels of pollutants like heavy metals, chlorides, and sulfates.
- Effective treatment methods are needed to mitigate the environmental risks associated with fly ash disposal.
Purpose of the Study:
- To investigate the solidification and stabilization of MSW fly ash using a lime-pozzolan binder.
- To assess the long-term effectiveness of this treatment in immobilizing pollutants.
Main Methods:
- Two MSW fly ash samples with high pollutant content were treated with a lime-pozzolan binder.
- The hydration process and the development of hydrate phases in the mixtures were studied.
- Pollutant release into leachants was monitored over a curing period.
Main Results:
- The lime-pozzolan binder effectively formed stable hydrate phases.
- Numerous pollutants, including heavy metals, were successfully stabilized within the hardened pastes.
- A significant reduction in pollutant leaching was observed, which improved with extended curing times.
Conclusions:
- Solidification/stabilization using lime-pozzolan binders is an effective method for treating MSW fly ash.
- This treatment immobilizes hazardous components, reducing the risk of environmental contamination.
- The efficacy of pollutant stabilization increases with the curing duration of the treated material.