4 Material und Umwelt
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- 4.3 Schadstofftransfer und Umwelttechnologien (238) (entfernen)
Paper des Monats
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Eingeladener Vortrag
- nein (78)
Auslaugung von Stoffen aus Bauteilen kann zu einer Belastung von Boden und Gewässern führen. Das Simulationsmodell COMLEAM (COnstruction Material LEAching Model) wurde eingesetzt, um die Stoffauswaschung besser zu verstehen und das damit verbundene Umweltrisiko besser einschätzen zu können. Emissionsfunktionen sind Bestandteil dieses Modells. Hier werden fünf verschiedenen Funktionen beschrieben, getestet und hinsichtlich ihrer Eignung für Prognosemodelle bewertet.
Tools for the characterization of secondary raw materials - status of leaching test application
(2018)
Leaching tests are used as tools for the assessment of environmental compatibility of granular waste materials with potential for reuse. The presentation gives an overview on available leaching tests, their field of application and relation to legislation. Furthermore robustness testing to elaborate optimized test conditions as well as performance characteristics from validation studies by BAM are addressed.
Tools for the characterization of secondary raw materials - status of leaching test application
(2018)
Leaching tests are used as tools for the assessment of environmental compatibility of granular waste materials with potential for reuse. The presentation gives an overview on available leaching tests, their field of application and relation to legislation. Furthermore robustness testing to elaborate optimized test conditions as well as performance characteristics from validation studies by BAM are addressed.
Tools for the characterization of secondary raw materials - status of leaching test application
(2018)
Leaching tests are used as tools for the assessment of environmental compatibility of granular waste materials with potential for reuse. The presentation gives an overview on available leaching tests, their field of application and relation to legislation. Furthermore robustness testing to elaborate optimized test conditions as well as performance characteristics from validation studies by BAM are addressed.
Im Beitrag wurden erste Ergebnisse eines laufenden UFOPLAN-Vorhabens zu den neuen Kriterien der Verwertungsmöglichkeiten von Bodenmaterialien außerhalb der durchwurzelbaren Bodenschicht nach den §§ 6 bis 8 der Novelle der BBodSchV vorgestellt. Der Schwerpunkt lag auf Untersuchungen der Schadstoffgruppe der PAK. Dabei wurden Probleme der Vergleichbarkeit und Leistungsfähigkeit verschiedener Elutions- und Analyseverfahren der PAK-Analytik diskutiert.
Im Beitrag wurden Ergebnisse von Elutionsuntersuchungen mit PFC kontaminierten Bodenmaterialien vorgestellt. Zum einen waren das Untersuchungen zur Eignung von Säulenversuchen für diese Schadstoffgruppe und zum anderen vergleichende Schüttel- und Säulenversuche für zwei verschiedene Böden mit unterschiedlichen PFC-Kontaminationsquellen.
Im Vortrag werden Auswaschversuche mit Bauprodukten vorgestellt, die dazu dienen sollen, Bauprodukte mit geringer Auswaschung zu erkennen. Zu verschiedenen Bauprodukten (Lacke für Außenanwendungen, Wärmedämmverbundsystemen, Dachziegel und Dachfolien) werden ausgewählte Ergebnisse vorgestellt. Die Eignung der Auswaschverfahren und die Testergebnisse werden bewertet.
Brominated flame retardants have widely been used for more than 50 years and have been frequently detected in environmental samples as surface water and fish. Leaching from construction products was identified as one possible source. The use of substances as e.g. hexabromocyclododecane (HBCCD) was restricted recently due to increasing concern about negative impacts on the environment and human health caused by the persistent, bio accumulative and toxic properties. New polymeric brominated flame retardants have been developed to replace HBCCD in expanded polystyrene (XPS), which is used for insulation of buildings. It is assumed that the release from the polymer is much smaller in comparison to release of small molecules as HBCCD. The release from the polymer may include monomers or small fragments of different size. Thus, a sum parameter is needed. According to Schlummer et al. it is possible to detect brominated molecules using X-ray fluorescence spectroscopy by determination of brome content in XPS extracts. As only small brominated compounds can be extracted it also allows for the differentiation between the two classes of compounds. This method was applied to verify the presence of different kinds of flame retardants in XPS samples and to evaluate the leaching behavior.
Leachiing tests - a useful tool for the environmental impact assessment of construction products?
(2018)
Construction products and waste materials used for construction can be in contact with the environment and may release potential harmful compounds. Information on the total content of these substances in the product is not sufficient to assess its envrionmental impact since it does not consider realistic exposure conditions.The impact of these compounds is often assessed by using the total content in the product. This estimation lacks realistic exposure conditions.
Concerning the pathway to soil and groundwater by contact with rain or seepage water leaching tests, which were developed and standardized by the European Committee for Standardization, are available. While for secondary construction products and waste this investigation of the leaching behaviour is standard procedure and is already part of regulation in Germany (draft ordinance on reuse of mineral waste) and within Europe (landfill directive) the release from primary construction products got in the focus more recently. Several monitoring studies found unexpected high concentrations of substances used as herbicides and fungicides in surface water and stormwater originating from urban areas. As some of these compounds are even banned for the use in agricultural applications in Europe alternative sources as roof materials and façade coatings exposed to rain were suggested. Further field and laboratory tests confirmed construction products as sources of these substances in water.
The aim of this presentation is to show exemplary results of existing leaching methods and underline the strength and weaknesses of the test system with selected examples from our work. We especially draw the attention to the research which is still needed to close the gap between the results of leaching experiments and the subsequent risk assessment of the products.