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Organisationseinheit der BAM
- 4 Material und Umwelt (442)
- 4.4 Thermochemische Reststoffbehandlung und Wertstoffrückgewinnung (95)
- 4.1 Biologische Materialschädigung und Referenzorganismen (91)
- 4.3 Schadstofftransfer und Umwelttechnologien (81)
- 4.2 Material-Mikrobiom Wechselwirkungen (77)
- 4.5 Kunst- und Kulturgutanalyse (66)
- 4.0 Abteilungsleitung und andere (46)
- 6 Materialchemie (30)
- 1 Analytische Chemie; Referenzmaterialien (27)
- 6.1 Oberflächen- und Dünnschichtanalyse (16)
Per- and polyfluoroalkyl substances (PFAS) have been used extensively in the past because of their inert chemical character and resistance to degradation by environmental influences. Since the beginning of their commercial use, PFAS have been widely exposed to the environment by application of PFAS in consumer products or as foaming agent in firefighting foams, thus several cases of contaminated soils sites have been reported. Since the number of known PFAS already exceeds 4700, their characterization and direct analysis is challenging given the current available techniques. Here, we introduce the novel fluorine (F) K-edge X-ray absorption near-edge structure (XANES) spectroscopy as a tool to analyze PFAS and inorganic fluorine compounds in contaminated soils and sewage sludges. While F K-edge bulk-XANES spectroscopy provide us information on the overall fluorine bonding in a sample micro X-ray fluorescence (XRF) in combination with F K-edge micro-XANES spectroscopy can also detect minor fluorine compounds and PFAS hotspots in investigated soils and sludges. Additionally, we used the combustion ion chromatography (CIC) to analyze the total amount of all PFAS as a sum parameter (extractable organic fluoride: EOF) in soils and sewage sludges. During combustion in the CIC, the PFAS in the sample get destroyed at temperatures of approx. 1000 °C and converted in inorganic fluorides that subsequently gets quantified by ion chromatography. Thus, for the first time we successfully combined F K-edge XANES spectroscopy and CIC as analytical tools to detect and quantify PFAS contaminants in soils and sewage sludges.
Rock-EATING FUNGI - Genetic Dive into the Biology of the Microcolonial Black Fungus Knufia petricola
(2021)
Microcolonial black fungi are a group of ascomycetes that exhibit high stress tolerance, yeast‑like growth and constitutive melanin formation. They dominate a range of hostile natural and man‑made environments, from desert rocks and salterns to dishwashers, roofs and solar panels. Due to their slow growth and a lack of genetic tools, the underlying mechanisms of black fungi’s phenotypic traits have remained largely unexplored. We chose to address this gap by genetically engineering the rock‑inhabiting fungus Knufia petricola (Eurotiomycetes, Chaetothyriales), a species that exhibits all characteristics of black fungi. The state‑of‑the‑art genetic toolkit, together with the annotated genome sequence of strain A95, firmly established K. petricola as a model for exploring microcolonial black fungi.
Antimon (Sb) wird in Industrieprodukten hauptsächlich als Flammschutzmittel in Kunststoff verwendet. Aufgrund solcher Zusätze in Kunststoffen landet etwa die Hälfte von Sb am Ende der Lebensdauer in der Verbrennung fester Siedlungsabfälle und folglich in relevanten Mengen in der erzeugten Bodenasche. Bei Kontakt mit Wasser ist die anfängliche Auslaugbarkeit gering, da Antimonat mit Ca2+ schwerlösliche Verbindungen bilden. Nach der Carnonatisierung der Verbrennungsasche (IBA) während der fortschreitenden Alterung nimmt der pH-Wert in den Sickerwasser ab. Mit abnehmender Ca-Konzentration im Eluat ändert sich das Lösungsgleichgewicht und Antimonate lösen sich auf.
In Deutschland ist beabsichtigt, Sb in IBA mit der geplanten Umsetzung der sogenannten Mantelverordnung (MantelVO, die Bestimmungen zur Verwertung von Mineralabfällen enthält) in naher Zukunft zu regulieren. Die im Entwurf festgelegten Grenzwerte können für IBA kritisch sein und stellen daher ein Risiko für die Verwendung der Mineralfraktion von IBA in den gut etablierten Recyclingwegen dar.
Geokunststoffe werden im Wasserbau häufig eingesetzt, beispielsweise bei Maßnahmen für den Küstenschutz oder in Ballastschichten für Windenergieanlagen. Eine zunehmende Anwendung von Geokunststoffen wird aufgrund der Ausweitung der Offshore-Windenergieerzeugung und des Schutzes auf steigende Wasserspiegel und extremere Wetterbedingungen infolge des Klimawandels beobachtet. Die Anwendung von Geokunststoffen in Wasserbauprojekten bietet zwar verschiedene wirtschaftliche und technische Vorteile, wurde jedoch kürzlich in Frage gestellt, da sich diese Materialien während ihrer Lebensdauer verschlechtern und langfristig gefährliche Auswirkungen auf die aquatische Umwelt haben können, insbesondere als Ursprung von Kunststoffabfällen oder als Quelle / Senke für Chemikalien wie Weichmacher und Stabilisatoren, die bei der Herstellung von Geokunststoffen verwendet werden, um deren Leistung zu verbessern. Der Vortrag geht auf diese Bedenken ein.
A brief perspective of BAM on nanocarriers is presented including examples with special emphasis on the characterization of such materials and underlying challenges. In this respect, also ongoing activities at BAM on different types of core/shell nanomaterials and related systems are briefly summarized.
Formaldehyde is considered as carcinogenic and is emitted from particleboards and plywood used in toy manufacturing. Currently, the flask method is frequently used in Europe for market surveillance purposes to assess formaldehyde release from toys, but its concordance to levels measured in emission test chambers is poor. Surveillance laboratories are unable to afford laborious and expensive emission chamber testing to comply with a new amendment of the European Toy Directive; they need an alternative method that can provide reliable results. Therefore, the application of miniaturised emission test chambers was tested. Comparisons between a 1 m3 emission test chamber and 44 mL microchambers with two particleboards over 28 days and between a 24 L desiccator chamber and the microchambers with three puzzle samples over 10 days resulted in a correlation coefficient r2 of 0.834 for formaldehyde at steady state. The correlation between the results obtained in microchambers vs. flask showed a high variability over 10 samples (r2: 0.145), thereby demonstrating the error-proneness of the flask method in comparison to methods carried out under ambient parameters. An exposure assessment was also performed for three toy puzzles: indoor formaldehyde concentrations caused by puzzles were not negligible (up to 8 μg/m3), especially when more conservative exposure scenarios were considered.
Test chamber measurements are an important tool to improve indoor air quality and occupational safety. Test chamber measurements are possible for a wide range of materials, products and technologies. Determination of concerning contaminants is important to ensure good indoor air quality. The detection of concerning contaminants depends on the approriate sampling and analysis.
Recycled fertilizers produced using processes for the recovery of phosphate from residual materials such as wastewater, sewage sludge and sewage sludge ashes show very good bioavailability, but it is still a product largely unknown to the market. The aim of CLOOP is therefore to document the properties and effects of such fertilizers through chemical, mineralogical and ecological analyses as well as analytical method development and pot and field plant growth trials.
Outotec focused on 3 points in CLOOP: Experimental campaigns, process simulations as well as economic analyses with focus on the AshDec process, respectively the design of a large-scale AshDec plant for phosphorus recovery. The laboratory scale trials as well as the semi-industrial scale campaign provided valuable insights into the operating parameters of the process and the plant. As a result, for example, the temperature range could be significantly lowered, and the additive addition reduced by approx. 20 %. They have further shown that the AshDec process is not susceptible to operating fluctuations and that the product can be consistently produced at high quality. With the selection of suitable operating parameters, heavy metals (As, Pb, Cd, (Zn)) can be removed. Within the campaign, about 1.5 t of fertilizer for the plant trials in CLOOP could be produced. An AshDec plant process was digitally created in simulation software, allowing valuable process parameters to be simulated at various operating parameters. On this basis, a full-scale plant was designed. The data obtained in the project were used for a detailed economic analysis including a sensitivity analysis. It was possible to show under which conditions this plant can be operated economically.
At BAM, the AshDec fertilizer was synthesized with different additives and then applied to plant experiments at Uni Bonn. The goal hereby was to check differences in plant uptake. Because of the promising results of AshDec synthesized with sodium-carbonate and because this AshDec version does not require special off gas treatment for sulfur recovery (compared to AshDec synthesized with sodium-sulfate), all project partners agreed on continuing working with this AshDec variation. It was then used as a raw P-source for formulating it into NPK-fertilizers, by granulation with ammonium-sulfate and straw ash as potassium source. These recycling fertilizers were applied to plant- and field experiments by project partners in Brazil (University of Sao Paulo) and Australia (University of Queensland). Furthermore, in leaching experiments, the solubility of phosphorus in AshDec was compared to triple super phosphate. The experiments were carried out on soils with a varying phosphorus buffering index. Results show, that the phosphorus form in AshDec is way less soluble in water. This indicates that AshDec has the potential for a so-called next generation fertilizer – a fertilizer which’s nutrients remain in the soil and supply the plant according to its needs. At the moment, this behavior gets examined more in depth in lysimeter experiments in cooperation with University of Technology Berlin.
The focus of KWB is the Life Cycle Assessment (LCA) of different NextGen fertilizers to evaluate the entire process chain from recovery to fertilizer application. The NextGen fertilizer is credited by the amount of plant available nutrients in the product, which replace nutrients from conventional fertilizer. The LCA covers N-struvite precipitation from municipal wastewater, K-struvite precipitation from industrial wastewater and the AshDec-product from sewage sludge. The LCA task is almost complete. It could be shown that struvite precipitation has comprehensive environmental benefits, mainly since positive side effects occur in sewage sludge treatment (e.g. reduced sludge volume). In principle, the energetic and ecological profile of the AshDec process compared to direct use of sewage sludge ash cannot be assessed as being generally beneficial or negative. Regarding the global warming potential, the Ashdec process shows that the expenses (e.g. energy, chemicals) cannot be covered by the P fertilizer credit. In contrast, the impact categories “terrestrial acidification potential”, and “freshwater eutrophication potential” show positive results as the credits for conventional fertilizer are higher than the burdens for the process.
At University Bonn, the standardized pot experiments were conducted with several AshDec variations, using ryegrass, soybean, and spinach on a slightly acidic sandy soil and an organic-free standard substrate. P-uptake and biomass production of different AshDec variations were generally like those of triple super phosphate and struvite, and clearly outperformed untreated sewage sludge ash and rock phosphate. Field trials in Australia and Brazil with sugarcane on acidic soils are still ongoing and results are expected by the end of 2021.
Das Jahr 2020 war vor allen Dingen von der Pandemie geprägt, die alle Bereiche des Lebens und Arbeitens beeinflusst hat und immer noch beeinflusst. Dies hat sich auch auf verschiedene Maßnahmen im Zusammenhang mit zugelassenen Produkten ausgewirkt. In diesem Zusammenhang sollen die Punkte kurz aufgeführt werden. Des Weiteren soll aufgezeigt werden, wie bei der Bearbeitung der Richtlinien, der Zulassungstätigkeit und Beurteilung der Produkte an der BAM und im Fachbeirat vorgegangen wird. Darüber hinaus soll noch einmal kurz auf die Entlassung aus der Nachsorgephase eingegangen werden. Am Ende sollen verschiedene aktuelle Fragestellungen des Fachbeirat aufgezeigt werden.