Use of high metal-containing biogas digestates in cereal production – Mobility of chromium and aluminium
| Autor: | Susanne Eich-Greatorex, Tore Krogstad, Trine A. Sogn, Svein Jarle Horn, Ivan Dragičević |
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| Rok vydání: | 2018 |
| Předmět: |
Chromium
Environmental Engineering 020209 energy 02 engineering and technology 010501 environmental sciences Management Monitoring Policy and Law complex mixtures 01 natural sciences Soil Organic waste Aluminium Chromium Metal leaching Biogas Metals Heavy Dissolved organic carbon 0202 electrical engineering electronic engineering information engineering Soil Pollutants Leaching (agriculture) Waste Management and Disposal 0105 earth and related environmental sciences General Medicine Biodegradable waste Manure Biofuels Environmental chemistry Soil water Digestate Environmental science Edible Grain Organic fertilizer Aluminum |
| Zdroj: | Journal of Environmental Management. 217:12-22 |
| ISSN: | 0301-4797 |
| DOI: | 10.1016/j.jenvman.2018.03.090 |
| Popis: | Biogas digestate use as organic fertilizer has been widely promoted in recent years as a part of the global agenda on recycling waste and new sustainable energy production. Although many studies have confirmed positive effects of digestates on soil fertility, there is still lack of information on the potential adverse effects of digestates on natural soil heavy metal content, metal leaching and leaching of other pollutants. We have investigated the release of aluminium (Al) and chromium (Cr) from different soils treated with commercial digestates high in mentioned potentially problematic metals in a field experiment, while a greenhouse and a laboratory column experiment were used to address mobility of these metals in two other scenarios. Results obtained from the field experiment showed an increase in total concentrations for both investigated metals on plots treated with digestates as well as a significant increase of water-soluble Al concentrations. Factors that were found to be mostly affecting the metal mobility were dissolved organic carbon (DOC), pH and type of soil. Metal binding and free metal concentrations were modelled using the WHAM 7.0 software. Results indicated that the use of digestates with high metal content are comparable to use of animal manure with respect to metal leaching. Data obtained through chemical modelling for the samples from the field experiment suggested that an environmental risk from higher metal mobility has to be considered for Al. In the greenhouse experiment, measured concentrations of leached Cr at the end of the growing season were low for all treatments, while the concentration of leached Al from digestates was higher. The high irrigation column leaching experiment showed an increased leaching rate of Cr with addition of digestates. |
| Databáze: | OpenAIRE |
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