Combining Activated Carbon Adsorption and CO2 Carbonation to Treat Fly Ash Washing Wastewater and Recover High-Purity Calcium Carbonate

Fly ash washing wastewater was carbonated with carbon dioxide (CO2) to remove calcium (Ca) by forming a calcium carbonate (CaCO3) precipitate. An investigation of the factors affecting carbonation showed that Ca removal was highly dependent on the initial pH of the wastewater. The Ca removal was 10%...

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Bibliographic Details
Published in:Water (Basel) 2024-10, Vol.16 (20), p.2896
Main Authors: Chen, Weifang, Chen, Yifan, Wang, Yegui, Zhao, Na
Format: Article
Language:English
Subjects:
Acids
Activated carbon
Adsorption
Alkalinity
Chemical precipitation
Chemicals
Crystallization
Flue gas
Gases
Heavy metals
Morphology
Municipal solid waste
Particle size
Salinity
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Summary:Fly ash washing wastewater was carbonated with carbon dioxide (CO2) to remove calcium (Ca) by forming a calcium carbonate (CaCO3) precipitate. An investigation of the factors affecting carbonation showed that Ca removal was highly dependent on the initial pH of the wastewater. The Ca removal was 10%, 61%, 91% and more than 99% at initial wastewater pH levels of 11.8, 12.0, 12.5 and 13.0, respectively. The optimal conditions for carbonation were initial pH of 13.0, carbonation time of 30 min and CO2 flow rate of 30 mL/min. The Ca concentration in the wastewater decreased to
ISSN:2073-4441
2073-4441
DOI:10.3390/w16202896