Reactive, Sparingly Soluble Calcined Magnesia, Tailor-Made as the Reactive Material for Heavy Metal Removal from Contaminated Groundwater Using Permeable Reactive Barrier

Author:

Fedoročková AlenaORCID,Raschman Pavel,Sučik Gabriel,Švandová Mária,Doráková Agnesa

Abstract

A laboratory method was designed and verified that allows for the testing of alkaline, magnesite-based reactive materials for permeable reactive barriers (PRBs) to remove heavy metals from contaminated groundwater. It was found that caustic calcined magnesia (CCM) with high reactivity and low solubility to remove Cu2+, Zn2+, Ni2+, and Mn2+ cations from mixed aqueous solutions can be prepared by calcination at a suitable temperature and residence time. Regarding the solubility of both the reactive material itself and the precipitates formed, the CCM should contain just a limited content of lime. One way is the calcination of a ferroan magnesite at temperatures above 1000 °C. However, the decrease in pH is accompanied by lower efficiency, attributed to the solid-phase reactions of free lime. A different way is the calcination of magnesite under the conditions when CaCO3 is not thermally decomposed. The virtually complete removal of the heavy metals from the model solution was achieved using the CCM characterised by the fraction of carbonates decomposed of approximately 80% and with the highest specific surface area. CCM calcined at higher temperatures could also be used, but this would be associated with higher consumption of crude magnesite. Under the conditions considered in the present work, the product obtained by the calcination at 750 °C for 3 h appeared to be optimal. The full heavy metal removal was observed in this case using less magnesite, and, moreover, at a lower temperature (resulting, therefore, in a lower consumption of energy for the calcination and material handling).

Funder

The Scientific Grant Agency of the Ministry of Education of the Slovak Republic and the Slovak Academy of Sciences

Publisher

MDPI AG

Subject

Geology,Geotechnical Engineering and Engineering Geology

Reference42 articles.

1. Kate Bronstein National Network of Environmental Management Studies Fellow for U.S. Environmental Protection Agency Office of Solid Waste and Emergency Response Office of Superfund Remediation and Technology Innovation, Washington, DC, August 2005https://clu-in.org/download/studentpapers/bronsteinprbpaper.pdf/

2. Permeable reactive barrier for groundwater remediation

3. Removal of heavy metal ions from wastewaters: A review

4. Acid mine drainage remediation options: a review

5. Removal of heavy metals using chemicals precipitation;Barbooti;Eng. Tech. J.,2011

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