Effect of ageing on the availability of heavy metals in soils amended with compost and biochar: evaluation of changes in soil and amendment properties
| Autor: | A. Venegas, Anna Rigol, Miquel Vidal |
|---|---|
| Přispěvatelé: | Universitat de Barcelona |
| Rok vydání: | 2016 |
| Předmět: |
Time Factors
Environmental remediation Health Toxicology and Mutagenesis Soil pollution 0211 other engineering and technologies Amendment 02 engineering and technology 010501 environmental sciences engineering.material Wastewater Contaminació dels sòls Solid Waste 01 natural sciences complex mixtures Soil Compostos orgànics Metals Heavy Biochar Organic compounds Environmental Chemistry Soil Pollutants natural sciences 0105 earth and related environmental sciences Pollutant 021110 strategic defence & security studies Metalls pesants Compost Chemistry fungi food and beverages Sorption General Medicine Pollution Soil conditioner Agronomy Heavy metals Spain Environmental chemistry Charcoal Soil water engineering bacteria Adsorption |
| Zdroj: | Dipòsit Digital de la UB Universidad de Barcelona Recercat. Dipósit de la Recerca de Catalunya instname |
| Popis: | Remediation strategies using soil amendments should consider the time dependence of metal availability to identify amendments that can sustainably reduce available pollutant concentrations over time. Drying-wetting cycles were applied on amendments, soils and soil + amendment mixtures, to mimic ageing at field level and investigate its effect on extractable Cd, Cu, Ni, Pb and Zn concentrations from three contaminated soils. The amendments investigated were municipal waste organic compost and biochars. The amendments, soils and mixtures were characterised by their physicochemical properties at different ageing times. The amendments were also characterised in terms of sorption capacity for Cd and Cu. The sorption capacity and the physicochemical properties of the amendments remained constant over the period examined. When mixed with the soils, amendments, especially the compost, immediately reduced the extractable metals in the soils with low pH and acid neutralisation capacity, due to the increase in pH and buffering capacity of the mixtures. The amendments had a relatively minor impact on the metal availability concentrations for the soil with substantially high acid neutralisation capacity. The most important changes in extractable metal concentrations were observed at the beginning of the experiments, ageing having a minor effect on metal concentrations when compared with the initial effect of amendments. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|