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Abstract
Re-use of phosphorus (P) from waste streams used for bioenergy conversion is desirable in order to reduce dependence on non-renewable P resources. Two different ash materials from low-temperature biomass gasification of wheat straw and sewage sludge, respectively, were investigated with regard to their P bioavailability. A set of pot experiments with spring barley was carried out to compare the ash P fertiliser value with mineral P fertiliser and the sewage sludge feedstock. An indirect radioactive labelling approach with 33P was used to determine the amount of P taken up from the fertiliser materials.
Depending on the dosage applied, straw gasification ash had a fertiliser effect comparable to mineral P. However, P uptake from the ash was generally lower than uptake from equivalent amounts of mineral P, and the calculated relative effectiveness was 44 % after six weeks of plant growth. In contrast, low- temperature gasification of Fe-rich sewage sludge reduced its P fertiliser value to practically zero. The results suggest that ashes from low-temperature gasification could be developed into alternative P fertilisers, however since their P bioavailability varies strongly depending on the feedstock used, a greater emphasis on feedstock composition is required.
Depending on the dosage applied, straw gasification ash had a fertiliser effect comparable to mineral P. However, P uptake from the ash was generally lower than uptake from equivalent amounts of mineral P, and the calculated relative effectiveness was 44 % after six weeks of plant growth. In contrast, low- temperature gasification of Fe-rich sewage sludge reduced its P fertiliser value to practically zero. The results suggest that ashes from low-temperature gasification could be developed into alternative P fertilisers, however since their P bioavailability varies strongly depending on the feedstock used, a greater emphasis on feedstock composition is required.
Bidragets oversatte titel | Phosphorus bioavailability in straw and sewage sludge ashes from low-temperature biomass gasification |
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Originalsprog | Engelsk |
Tidsskrift | Soil Use and Management |
Vol/bind | 34 |
Udgave nummer | 1 |
Sider (fra-til) | 9-17 |
ISSN | 0266-0032 |
DOI | |
Status | Udgivet - 2018 |
Emneord
- forgasning
- aske
- gødning
- Fosfor
- Spildevandsslam
Projekter
- 2 Afsluttet
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INSURANCE: Combined soil carbon sequestration and crop nutrient supply using thermal conversion technology residuals
01/04/2013 → 31/03/2016
Projekter: Projekt › Forskning
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Fuel-Flexible, Efficient and Sustainable Low Temperature Gasification
01/04/2012 → 01/09/2016
Projekter: Projekt › Forskning