Erprobung und Erfolgskontrolle eines Phytoremediations-verfahrens zur Sanierung Sprengstoff-kontaminierter B?den

Zusammenfassung  Die Befunde des in seiner Konzeption in Teil I dargestellten Freilandexperimentes dokumentieren die TNT-Abreicherung und Erholung des Standortes im Laufe der Phytoremediation. Das Monitoring umfasst Erhebungen im Feld (Nitroaromatengehalte in Boden, Sickerwasser und Pflanzen; Erfassung von Bodenorganismen und Streuabbau) und den Einsatz einer Biotestbatterie mit 6 Einzeltests. Die Daten belegen die hohe Heterogenit?t der TNT-Kontamination, eine rasche initiale Abreicherung und eine geringe Verlagerung von Nitroaromaten in Pflanzen und Sickerwasser. Die anf?nglich rasche Transformation des TNT zu Aminodinitrotoluolen l?sst nach 3 Monaten deutlich nach. Mit Hilfe der Biotestbatterie wird die Toxizit?t des Bodens differenziert beurteilbar; die boden-biologischen Befunde lassen Langzeitwirkungen der TNT-Belastung wahrscheinlich werden. Eine Gesamtbeurteilung des Projekts wird im dritten Teil der Artikelserie erfolgen. OnlineFirst: 10. 09. 2001     

Impact of photocatalytic remediation of pollutants on urban air quality

In the recent years, photocatalytic self-cleaning and “depolluting” materials have been suggested as a remediation technology mainly for NO _x and aromatic VOCs in urban areas. A number of products incorporating the aforementioned technology have been made commercially available with the aim to improve urban air quality. These commercial products are based on the photocatalytic properties of a thin layer of TiO₂ at the surface of the material (such as glass, pavement, etc.) or embedded in paints or concrete. The use of TiO₂ photocatalysts as an emerging air pollution control technology has been reported in many locations worldwide. However, up to now, the effectiveness measured in situ and the expected positive impact on air quality of this relatively new technology has only been demonstrated in a limited manner. Assessing and demonstrating the effectiveness of these depolluting techniques in real scale applications aims to create a real added value, in terms of policy making (i.e., implementing air quality strategies) and economics (by providing a demonstration of the actual performance of a new technique).

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Perfluorooctanoic acid and perfluorooctane sulfonate released from a waste water treatment plant in Bavaria, Germany

Purpose

Perfluorooctanoate (PFOA), perfluorooctane sulfonate (PFOS), and precursors and derivatives thereof have been employed as surfactants and anti-adhesives. PFOA and PFOS are environmentally persistent and the discharge of municipal waste waters is one of the principal routes of these compounds into the aquatic environment. In a previous study, the concentrations of PFOA and PFOS in grab samples collected from the waste water treatment plant (WWTP) of Bayreuth, a city of 72,000 inhabitants in Bavaria, Germany, during two periods showed considerable variability. For a better estimate of average mass flows, the surfactants were monitored (five samplings) from 16 March to 18 May 2007. In a second campaign, river water receiving the WWTP effluent was sampled twice a day for five consecutive days.

Methods

Quantitative analysis was done by stable-isotope dilution, pre-cleaning, and pre-concentration by solid-phase extraction, and liquid chromatography followed by electrospray ionization/tandem mass spectrometry.

Results

The mass flows of PFOA and PFOS through the WWTP were determined. PFOA is fully discharged into the river, while about half of PFOS is retained in the sewage sludge. The average daily mass load of the river Roter Main by the WWTP of Bayreuth is about 1.2?±?0.5 g PFOA and 5?±?2 g PFOS, with variations of up to 140% within one day.

Conclusion

Overall, the total annual release to the rivers of Germany may be in the range of several hundred kilograms of PFOA and several tons of PFOS.     

Müllverbrennungs-Schlacke als Baumaterial

In order to determine the possible depreciation of its quality as a building material, solid waste residues from a municipal solid waste incinerator were analysed in a case study for its contents of various organic fractions with special emphasis on fractions which can be utilised by microbes as carbon sources. Furthermore, microbial concentrations in ashes, microbial fermentation and pH dependent viability of soil microbes in extracts of ashes were determined. Results demonstrate a low content of organic fractions in the solid waste, especially of those which can serve as C-sources for soil microbes. Microbial concentrations and rates of fermation in the ash are extremely low. The former is not only limited by the availability of suitable C-sources, but also by the alkaline pH of and the heavy metal concentration in the soil solution. Model calculations confirm that the maximal possible gas formation is extremely low and therefore does not diminish the quality of the incinerator ash as a potential building material.     

Bleiverunreinigung von trinkwasser durch leitungssysteme in Berlin

There are many acute and chronic adverse effects of lead on human beings. This is especially true for infants and children. In Germany, the intake of lead through drinking water is commonly due to metal corrosion of the user’s plumbing. In the last years and decades, many lead pipes in Germany were replaced by pipes made of alternative materials. The aim of this study was to assess the present state of drinking water contamination and the resulting lead exposure in infants, the most sensitive population group. For this purpose, mothers of newborn babies were offered a free examination of their drinking water. After a written declaration of consent had been received, two composite samples collected during the day were obtained from the families. The samples were analyzed for their lead concentration using atomic absorption spectrometry. A total of 2109 samples from house holds in the area of Berlin, Germany were collected. From the first composite samples 5.6% and 7.0% of the second composite samples demonstrated lead concentrations higher than 0.01 mg/l (recommended limit of the WHO). 0.95% of the first composite samples and 1.3% of the second composite samples had concentrations above the limit of the German drinking water regulation (0.04 mg/l). The highest measured lead concentrations is the first and second composite samples were 0.19 and 0.13 mg/l, respectively. By region, the suburbs of Charlottenburg, Neukölln, Schöneberg, Wilmersdorf and Zehlendorf were particularly severley affected with more than 10% and their samples being elevated above 0.01 mg/l.     

Perfluorooctanoic acid and perfluorooctane sulfonate in the sediment of the Roter Main river, Bayreuth, Germany

Perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) are widely distributed in aquatic ecosystems. Their sources are known but few studies about their accumulation potential in river sediments exist. The aim of this study is to assess the concentrations of PFOA and PFOS in sediments in relation to their levels in river water receiving effluent from a waste water treatment plant (WWTP). PFOS accumulates by a factor of about 40 relative to river water, PFOA only up to threefold. In contrast to previous suggestions, in this case the enrichment on sediment is not correlated to the total organic carbon contents.