Geochemical simulation of the stabilization process of vanadium-contaminated soil remediated with calcium oxide and ferrous sulfate
| Autor: | Nuo Liu, Jianguo Jiang, Aikelaimu Aihemaiti, Quan Zou, Jiwei Liu, Yuchen Gao, De’an Li |
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| Rok vydání: | 2019 |
| Předmět: |
China
Health Toxicology and Mutagenesis Inorganic chemistry 0211 other engineering and technologies Vanadium chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 01 natural sciences Ferrous Soil chemistry.chemical_compound Ferrihydrite Soil pH Soil Pollutants Computer Simulation Ferrous Compounds Sulfate Calcium oxide Environmental Restoration and Remediation 0105 earth and related environmental sciences 021110 strategic defence & security studies Soil organic matter Public Health Environmental and Occupational Health Oxides General Medicine Calcium Compounds Models Theoretical Pollution Soil contamination chemistry Adsorption Software |
| Zdroj: | Ecotoxicology and Environmental Safety. 174:498-505 |
| ISSN: | 0147-6513 |
| Popis: | Vanadium (V)-contaminated soil poses health risks to plants, animals, and humans via both direct exposure and through the food chain. Stabilization treatment of metal-contaminated soil can chemically convert metal contaminants into less soluble, mobile, and toxic forms. However, the stabilization mechanisms of V-contaminated soil have not been thoroughly investigated. Therefore, we performed geochemical modeling of V-contaminated soil stabilized with the common binders calcium oxide (CaO) and ferrous sulfate (FeSO4), as well as their mixture, using Visual MINTEQ software. The results were validated and exhibited good agreement with experimental results. For CaO, the formation of Ca2V2O7(s) and Ca3(VO4)2·4H2O(s) under mild and strong alkaline conditions (pH = 8.0–11.5 and 11.5–12.5), respectively, were predicted as the main immobilization routes. For FeSO4, there appeared to be three reaction routes, corresponding to approaches A, B, and C, during the stabilization process. In the simulation, approach C (adsorption of V(V) onto ferrihydrite) was undervalued, whereas approaches A (formation of Fe(VO3)2(s)) and B (reduction of V(V) into V(IV) to form V2O4(s) or adsorb onto soil organic matter) were overvalued. Among the three approaches, approach C had a dominant role and exhibited good agreement with the experimental results. Additionally, soil pH and the saturation index of precipitation had major roles in the stabilization process. The optimal pH ranges for the stabilization of V-contaminated soil using CaO and FeSO4 were pH = 9.5–12.5 and pH = 4.0–5.0, respectively. |
| Databáze: | OpenAIRE |
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