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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472
EISSN: 1735-2630
Vol. 12, No. 8, 2015, pp. 2697-2710
Bioline Code: st15253
Full paper language: English
Document type: Research Article
Document available free of charge

International Journal of Environment Science and Technology, Vol. 12, No. 8, 2015, pp. 2697-2710

 en Viability of adding gypsum and calcite for remediation of metal-contaminated soil: laboratory and pilot plant scales
Gonza´lez-Nu´n˜ez, R.; Alba, M. D.; Vidal, M. & Rigol, A.

Abstract

The effect of adding waste materials (gypsum and calcite) for the remediation of a soil contaminated by pyritic minerals was examined. Materials were characterised in terms of their acid neutralisation capacity (ANC), sorption capacity and structural components. Their effect on the contaminant leaching in soil + material mixtures over a wide range of pH was also evaluated. Results at laboratory and pilot plant scales were compared to account for the potential variability in the material efficiency when applied at larger scale. The use of gypsum permitted its valorisation, although calcite was a more effective amendment because its addition led to a greater increase in the pH and acid neutralisation capacity, and thus in the sorption capacity in the resulting soil + material mixture. In the same way, when the combination of gypsum + calcite was added to the soil, it led to an increase in the pH from 2.5 to 6.9 and in the ANC from -86 to 1,513 meq/kg. As a result, the concentration of extractable heavy metals and As was reduced, and they were successfully immobilised both at laboratory and at pilot plant scales. Thus, the use of these materials induced a signifi- cant reduction in the contaminant mobility and permitted the valorisation of waste materials.

Keywords
pHstat leaching test; Gypsum; Calcite; Metal-contaminated soil; Remediation

 
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