Ahrenfeldt, Jesper

Grønlund, Mette

Hauggaard-Nielsen, Henrik

Jakobsen, Iver

Jensen, Lars Stoumann

Müller-Stöver, Dorette Sophie

English

The return of residual products from bioenergy generation to soils is a step towards closing nutrient cycles, which is especially important for nutrients produced from non-renewable resources such as phosphorus (P). Low-temperature gasification is an innovative process efficiently generating energy from different biomass fuels, such as agricultural residues and waste streams, and at the same time producing a biochar product potentially valuable for soil amendment. In pot experiments, different residual products originating from low-temperature gasification were tested for their P-fertilizing potential with spring barley as a test crop. Biochar resulting from gasification of pure wheat straw showed the best P fertilizer value, however, because of the low P content, extremely high amounts had to be applied when crop P demand should be met, which came along with an over-fertilization of potassium (K). Gasification of pure sewage sludge with a high Fe and Al content practically eliminated its P fertilizer value, while co-gasification of sludge lower in Fe and Al together with wheat straw resulted in a biochar product with only somewhat reduced P availability and improved P/K ratio for fertilization purposes. Operationally defined P pools in soil obtained by sequential chemical extraction of the biochar-amended soils could be related to the observations made in the pot experiments. The results emphasize the potential of combining different feedstocks for thermal conversion processes when aiming at improving the usability of the residual products.The return of residual products from bioenergy generation to soils is a step towards closing nutrient cycles, which is especially important for nutrients produced from non-renewable resources such as phosphorus (P). Low-temperature gasification is an innovative process efficiently generating energy from different biomass fuels, such as agricultural residues and waste streams, and at the same time producing a biochar product potentially valuable for soil amendment. In pot experiments, different residual products originating from low-temperature gasification were tested for their P-fertilizing potential with spring barley as a test crop. Biochar resulting from gasification of pure wheat straw showed the best P fertilizer value, however, because of the low P content, extremely high amounts had to be applied when crop P demand should be met, which came along with an over-fertilization of potassium (K). Gasification of pure sewage sludge with a high Fe and Al content practically eliminated its P fertilizer value, while co-gasification of sludge lower in Fe and Al together with wheat straw resulted in a biochar product with only somewhat reduced P availability and improved P/K ratio for fertilization purposes. Operationally defined P pools in soil obtained by sequential chemical extraction of the biochar-amended soils could be related to the observations made in the pot experiments. The results emphasize the potential of combining different feedstocks for thermal conversion processes when aiming at improving the usability of the residual product

Roskilde Universitet

RoskildeUniversityReturn of phosphorus in agricultural residues and urban sewage sludge to soil usingbiochar from low-temperature gasification as fertilizer productMüller-Stöver, Dorette Sophie; Jensen, Lars Stoumann; Grønlund, Mette; Jakobsen, Iver;Hauggaard-Nielsen, Henrik; Ahrenfeldt, JesperPublication date:2015Document VersionEarly version, also known as pre-printCitation for published version (APA):Müller-Stöver, D. S., Jensen, L. S., Grønlund, M., Jakobsen, I., Hauggaard-Nielsen, H., & Ahrenfeldt, J. (2015).Return of phosphorus in agricultural residues and urban sewage sludge to soil using biochar from low-temperature gasification as fertilizer product. Abstract from Joint International Biochar Symposium 2015,Geisenheim, Germany.General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright ownersand it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.            • Users may download and print one copy of any publication from the public portal for the purpose of private study or research.            • You may not further distribute the material or use it for any profit-making activity or commercial gain.            • You may freely distribute the URL identifying the publication in the public portal.Take down policyIf you believe that this document breaches copyright please contact rucforsk@ruc.dk providing details, and we will remove access to thework immediately and investigate your claim.Download date: 26. Dec. 2021Return of phosphorus in agricultural residues and urban sewage sludge to soil using biochar from low-temperature gasification as fertilizer product Dorette Müller-Stöver1, Lars Stoumann Jensen1, Mette Grønlund1, Iver Jakobsen1, Jesper Ahrenfeldt2 and Henrik Hauggaard-Nielsen3 1 University of Copenhagen, Department of Plant & Environmental Sciences, Frederiksberg, Denmark; 2 Technical University of Denmark, Department of Chemical and Biochemical Engineering, Kgs. Lyngby, Denmark 3Roskilde University, Department of Environmental, Social and Spatial Change, Roskilde, Denmark; *corresponding author: dsst@plen.ku.dk  Abstract The return of residual products from bioenergy generation to soils is a step towards closing nutrient cycles, which is especially important for nutrients produced from non-renewable resources such as phosphorus (P). Low-temperature gasification is an innovative process efficiently generating energy from different biomass fuels, such as agricultural residues and waste streams, and at the same time producing a biochar product potentially valuable for soil amendment. In pot experiments, different residual products originating from low-temperature gasification were tested for their P-fertilizing potential with spring barley as a test crop. Biochar resulting from gasification of pure wheat straw showed the best P fertilizer value, however, because of the low P content, extremely high amounts had to be applied when crop P demand should be met, which came along with an over-fertilization of potassium (K). Gasification of pure sewage sludge with a high Fe and Al content practically eliminated its P fertilizer value, while co-gasification of sludge lower in Fe and Al together with wheat straw resulted in a biochar product with only somewhat reduced P availability and improved P/K ratio for fertilization purposes. Operationally defined P pools in soil obtained by sequential chemical extraction of the biochar-amended soils could be related to the observations made in the pot experiments. The results emphasize the potential of combining different feedstocks for thermal conversion processes when aiming at improving the usability of the residual products.  Preferred: Poster presentation Kommenterede [hnie1]: Eneste kommentar er at hygiejniseringen er udeladt, og det syntes jeg er ærgeligt. Det peger fremad, viser nye muligheder som bør undersøges nærmere – det kann måske give dig nogle gode kontakter til fremtidige ansøgninger?! 

Return of phosphorus in agricultural residues and urban sewage sludge to soil using biochar from low-temperature gasification as fertilizer product

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Return of phosphorus in agricultural residues and urban sewage sludge to soil using biochar from low-temperature gasification as fertilizer product

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