Temporal changes in arsenic and lead pools in a contaminated sediment amended with biochar pyrolyzed at different temperatures
| Autor: | Matheus Bortolanza Soares, Felipe Hipólito dos Santos, Luís Reynaldo Ferracciú Alleoni |
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| Rok vydání: | 2022 |
| Předmět: |
Environmental Engineering
Health Toxicology and Mutagenesis chemistry.chemical_element Arsenic Soil chemistry.chemical_compound Nitric acid Biochar Soil Pollutants Environmental Chemistry Organic matter chemistry.chemical_classification REMEDIAÇÃO DO SOLO Temperature Public Health Environmental and Occupational Health Sediment General Medicine General Chemistry Contamination Pollution Lead chemistry Charcoal Environmental chemistry Soil water Pyrolysis |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | Globally, tons of soils and sediments are experiencing degradation due to the presence of high concentrations of potentially toxic elements (PTEs), such as arsenic (As) and lead (Pb), in areas in the vicinity of metal mining activities. The addition of biochar to contaminated sediments is a promising in situ remediation approach, and the effects of pyrolysis temperature and biochar aging are important factors for the immobilization and fate of PTEs. In this study, we evaluated the temporal changes in pools of As and Pb in sediment amended with biochars produced from sugarcane (Saccharum officinarum) pyrolyzed at 350 (BC350), 550 (BC550), and 750 °C (BC750). Biochars were aged by natural process (without additional acid or heat), and changes in As and Pb pools were evaluated every 45 days until completing 180 days of incubation. Changes in the As and Pb pools were extracted with water (bioavailable), magnesium chloride (exchangeable), nitric acid (active geochemical fraction), and exchangeable Mehlich-3 (associated with organic matter). As and Pb available contents have increased over time. BC750 was more effective in reducing the bioavailable and exchangeable As contents, while BC550 and BC350 were more effective in reducing the contents of bioavailable and exchangeable Pb. |
| Databáze: | OpenAIRE |
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