Effects of mineral amendments on trace elements leaching from pre-treated marine sediment after simulated rainfall events
| Autor: | Giovanni Libralato, A. Volpi Ghirardini, Mehwish Taneez, Charlotte Hurel |
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| Přispěvatelé: | Hurel, C, Taneez, M, Volpi Ghirardini, A, Libralato, Giovanni |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Geologic Sediments
Settore MED/42 - Igiene Generale e Applicata Health Toxicology and Mutagenesis Rain 0211 other engineering and technologies 02 engineering and technology 010501 environmental sciences Toxicology 01 natural sciences Geologic Sediment Soil Dredged marine sediment Aluminum Oxide Leachate Dredged marine sediments Mineral amendments Red mud Stabilization Trace elements Pollution media_common Cadmium General Medicine Hydrogen-Ion Concentration Health Environmental chemistry Trace element Environmental Pollutants Geology Settore BIO/07 - Ecologia Gypsum media_common.quotation_subject Mineralogy chemistry.chemical_element engineering.material Mineral amendment Calcium Sulfate Metals Heavy Toxicology and Mutagenesis Seawater Environmental Pollutant 0105 earth and related environmental sciences 021110 strategic defence & security studies Trace Elements Bauxite chemistry engineering Leaching (metallurgy) |
| Popis: | Bauxite extraction by-products (red mud) were used to evaluate their potential ability to stabilize trace elements from dredged and aerated/humidified marine sediment. The investigated by-products were: bauxaline(®)(BX) that is a press-filtered red mud; bauxsol™(BS) that is a press-filtered red mud previously washed with excess of seawater, and gypsum neutralized bauxaline(®) (GBX). These materials were separately mixed to dredged composted sediment sample considering 5% and 20% sediment: stabilizer ratios. For pilot experiments, rainfall events were regularly simulated for 3 months. Concentrations of As, Mo, Cd, Cr, Zn, Cu, and Ni were analyzed in collected leachates as well as toxicity. Results showed that Cd, Mo, Zn, and Cu were efficiently stabilized in the solid matrix when 20% of BX, BS, and GBX was applied. Consequently, toxicity of leachates was lower than for the untreated sediment, meaning that contaminants mobility was reduced. A 5% GBX was also efficient for Mo, Zn and Cu stabilization. In all scenarios, As stabilization was not improved. Compared to all other monitored elements, Mo mobility seemed to depend upon temperature-humidity conditions during pilot experiments suggesting the need of further investigations. |
| Databáze: | OpenAIRE |
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