TY - CONF A1 - Herzel, Hannes T1 - R-Rhenania – Modifiziertes Rhenania Phosphat aus der Klärschlammverbrennung mit thermochemischen Aufschluss N2 - Der Betreiber der Klärschlammverbrennungsanlage Altenstadt (Emter GmbH) integriert einen thermochemischen Prozessschritt in die vorhandene Monoverbrennung und erweitert die Anlage entsprechend, um einen Ausgangsstoff für die Düngemittelproduktion zu erzeugen und damit zur Phosphatrückgewinnung gemäß Klärschlammverordnung (AbfKlärV) beizutragen. Die Umrüstung der Anlage fand im ersten Halbjahr 2024 statt und seit Sommer 2024 steht eine Kapazität für die jährliche Produktion von 15.000 Tonnen schadstoffarmen R-Rhenania Phosphat mit hochwirksamen Phosphatverbindungen zur Verfügung. Diese Demonstrationsanlage wird durch ein wissenschaftliches Monitoring im vom BMFTR geförderte Projekt R-Rhenania (2020-2026) mit u.a. Ökobilanzierungen, Gefäß- und Feldversuche begleitet. Der Projektpartner sePura plant den produzierten Dünger vollständig regional in Bayern zu verwerten T2 - DPP Forum CY - Frankfurt am Main, Germany DA - 08.10.2025 KW - Phosphor KW - Recycling KW - CaNaPO4 KW - Pflanzenversuche KW - Klärschlamm KW - Additiv PY - 2025 AN - OPUS4-64711 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Raniro, H.R. A1 - Teles, A.P. A1 - Pavinato, P.S. A1 - Adam, Christian T1 - Phosphorus solubility and dynamics in a tropical soil under sources derived from wastewater and sewage sludge N2 - Conventional phosphate fertilizers are usually highly water-soluble and rapidly solubilize when moistened by the soil solution. However, if this solubilization is not in alignment with plants demand, P can react with the soil colloidal phase, becoming less available over time. This is more pronounced in acidic, oxidic tropical soils, with high P adsorption capacity, reducing the efficiency of P fertilization. Furthermore, these fertilizers are derived from phosphate rock, a non-renewable resource, generating an environmental impact. To assess these concerns, waste-recycled P sources (struvite, hazenite and AshDec®) were studied for their potential of reducing P Fixation by the soil and improving the agronomic efficiency of the P fertilization. In our work, we compared the solubilization dynamics of struvite, hazenite, AshDec® to triple superphosphate (TSP) in a sandy clay loam Ferralsol, as well as their effect on solution pH and on soil P pools (labile, moderately-labile and non-labile) via an incubation experiment. Leaching columns containing 50 g of soil with surface application of 100 mg per column (mg col􀀀 1) of P from each selected fertilizer and one control (nil-P) were evaluated for 60 days. Daily leachate samples from the column were analyzed for P content and pH. Soil was stratified in the end and submitted to P fractionation. All results were analyzed considering p < 0.05. Our findings showed that TSP and struvite promoted an acid P release reaction (reaching pHs of 4.3 and 5.5 respectively), while AshDec® and hazenite reaction was alkaline (reaching pHs of 8.4 and 8.5 respectively). Furthermore, TSP promoted the highest P release among all sources in 60 days (52.8 mg col􀀀 1) and showed rapid release dynamic in the beginning, while struvite and hazenite showed late release dynamics and lower total leached P (29.7 and 15.5 mg col􀀀 1 P respectively). In contrast, no P-release was detected in the leachate of the AshDec® over the whole trial period. Struvite promoted the highest soil labile P concentration (7938 mg kg􀀀 1), followed by hazenite (5877 mg kg􀀀 1) and AshDec® (4468 mg kg􀀀 1), all higher than TSP (3821 mg kg􀀀 1), while AshDec® showed high moderately-labile P (9214 mg kg􀀀 1), reaffirming its delayed release potential. KW - Phosphate dynamics KW - Struvite KW - Wastewater KW - Sewage sludge ash KW - CaNaPO4 KW - P speciation PY - 2022 DO - https://doi.org/10.1016/j.jenvman.2021.113984 VL - 302 IS - Part A SP - 113984 PB - Elsevier Ltd. AN - OPUS4-53600 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -