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- 2017 (2) (entfernen)
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- Phosphorus (2)
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Eingeladener Vortrag
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Sewage sludge ashes contain high phosphorus (P) mass fractions and can be used as raw material for P-fertilizers. We developed a thermochemical treatment at 900-1000 °C, known as AshDec process. The phosphorus compounds in the ash react with alkali additives (e.g. Na2SO4, K2SO4) to highly plant available calcium alkali phosphates. We investigate the system CaNaPO4-CaKPO4 (e.g. thermodynamic data) and phase reaction mechanisms as well as the optimization of additive input and process parameters for a later use of the treated ashes as P-fertilizers.
Project ASHES – nutrient recycling from the thermo-chemical processing of waste bagasse and straw
(2017)
Recycling of nutrients from residues of thermo-chemical processing of bagasse/sugar cane straw. The project ASHES is a German-Brazilian collaborative research project and is focused on the recycling of nutrients from residues of thermo-chemical processing of by-products of sugar cane industry (bagasse/straw) in Brazil. The challenge of the project is to increase the energy efficiency of thermal conversion (combustion/gasification) and to enable the recycling of process ashes to close material cycles by gaining adequate and competitive fertilizers as well as (functional) fillers in (bio-)polymer compounds. For this purpose, phosphorus salts are recovered from bagasse, straw, filtercake and vinasse with leaching and precipitation. The AshDec process was used to increase the availability of phosphorus for plant uptake in the ashes. Additives like sewage sludge and chicken manure were also tested. Different fertilizer formulations are granulated/pelletized and tested regarding their storage/handling characteristics. The fertilizing effects are evaluated in plant growth tests and compared with common extraction methods and the new promising diffusive gradients in thin films (DGT)-method. The results of the agronomic investigation of various ashes based products should provide targeted and integrated recommendations for the thermal conversion of bagasse/straw to secondary fertilizers in line with the so-called Next Generation fertilizer strategy. ASHES-partners are Fraunhofer UMSICHT (coordinator), Karlsruhe Institute of Technology (KIT), Bundesanstalt für Materialforschung und -prüfung (BAM), Fraunhofer IGB, Forschungszentrum Jülich (FZJ), CUTEC Institute, the Brazilian Center for Research in Energy and Materials (CNPEM), Federal Institute of Goiás (IFG), Laboratório Nacional Agropecuario (LANAGRO) and the Universidade Federal de Goiás (UFG), as well as the companies Tecnaro and Outotec.