Phosphorus and cadmium availability in soil fertilized with biosolids and ashes
Autor: | Evelina Brännvall, Nils Skoglund, Stasys Čirba, Vladislovas Česlovas Aksamitauskas, Jurate Kumpiene, Martin Wolters |
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Jazyk: | angličtina |
Rok vydání: | 2016 |
Předmět: |
Environmental Engineering
Biosolids Health Toxicology and Mutagenesis 0211 other engineering and technologies Plant Development chemistry.chemical_element Biomass Sewage Combustion Incineration 02 engineering and technology 010501 environmental sciences 01 natural sciences Inorganic Chemistry Phytoavailability Soil Pollutants Environmental Chemistry Fertilizers Sewage sludge 0105 earth and related environmental sciences 021110 strategic defence & security studies Cadmium Oorganisk kemi Soil pore water business.industry Phosphorus Grass Public Health Environmental and Occupational Health General Medicine General Chemistry Plants Pollution Environmental Management chemistry Agronomy Environmental science business Miljöledning Sludge |
Popis: | The recycling of hygienized municipal sewage sludge (biosolids) to soil as the source of phosphorus (P) is generally encouraged. The use of biosolids, however, has some concerns, such as the presence of elevated concentrations of potentially toxic trace elements, and the possible presence of pathogens, hormones and antibiotics. Organic substances are destroyed during combustion whereas trace elements could partly be separated from P in different ash fractions. Biomass combustion waste (ash) can instead be considered as an alternative P source. This study evaluates and compares the impact of biosolids and their combustion residues (ashes), when used as fertilizers, on P and Cd solubility in soil, plant growth and plant uptake of these elements. Biosolids were also amended with K and Ca to improve the composition and properties of P in ashes, and incinerated at either 800 °C or 950 °C. Combustion of biosolids improved the Cd/P ratio in ashes by 2-5 times, compared with the initial biosolids. The low Cd content in ashes (4-9 mg Cd (kg P)(-1)) makes this material a particularly attractive alternative to mineral fertilizers. Significantly higher pore water P (as well as total N) was measured in soils containing biosolids, but plants produced a higher biomass in soil fertilized with ashes. The K and Ca amendments prior to biosolids combustion generally decreased the total Cd in ash, but had little effect on P and Cd uptake and biomass growth. Similarly, the combustion temperature had negligible effect on these factors as well. |
Databáze: | OpenAIRE |
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