Influence of mixture ratio and pH to solidification/stabilization process of hospital solid waste incineration ash in Portland cement
| Autor: | Elżbieta Sobiecka, Blanca Antizar-Ladislao, Andrzej Obraniak |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Environmental Engineering
Municipal solid waste Health Toxicology and Mutagenesis Solidification stabilization Incineration Coal Ash law.invention Granulation Hazardous waste law Metals Heavy Environmental Chemistry Medical Waste Disposal Environmental Restoration and Remediation Cement Construction Materials Chemistry Silicates Spectrophotometry Atomic Metallurgy Public Health Environmental and Occupational Health General Medicine General Chemistry Calcium Compounds Hydrogen-Ion Concentration Pollution Solutions Portland cement Fly ash Gels Water Pollutants Chemical |
| Zdroj: | Chemosphere. 111:18-23 |
| ISSN: | 0045-6535 |
| Popis: | Solidification/stabilization (S/S) is an established utilization technology to treat hazardous wastes. This research explored the influence of pH (3–12) on the immobilization of heavy metals present in five mixtures of hospital solid waste incinerator ash and Portland cement, following two different processes of waste solidification/stabilization (cement hydration and granulation). In general, cement hydration process resulted in more stable products than granulation process. A high ash content in the mixture with Portland cement (60 wt%) resulted in the highest immobilization of Pb 2+ and Cu 2+ , while a low ash content in the mixture (10 wt%) resulted in the lowest leachability of Zn 2+ . When ash and Portland cement was mixed in equal proportions (50 wt%) the highest encapsulation was observed for Ni 2+ , Cd 2+ and Cr 3+ . Neutral and weak alkaline pH values within the range pH = 7–8 resulted in the lowest leachability of the monitored heavy metals. |
| Databáze: | OpenAIRE |
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