Monitored Natural Konzepte (MNA) bei Altablagerungen mit Ammoniumemissionen

Natürliche Abbau- und Rückhalteprozesse (Natural Attenuation, NA) können die Ausbreitung von Schadstoffen in Grundwasserleitern verlangsamen oder zum Stillstand bringen. Aufmerksam auf dieses Phänomen wurde man durch Beobachtungen, dass bei einer erheblichen
Anzahl von Altlasten im Grundwasser Schadstofffahnen von geringerem Ausmaß als erwartet beobachtet werden.

Vielfach gibt es in diesem Zusammenhang auch Hinweise, dass die Schadstoffausbreitung im Grundwasserleiter zum Stillstand gekommen ist, d. h., dass sich eine stationäre Schadstofffahne ausgebildet hat. Es liegt in diesen Fällen ein begrenzter Grundwasserschaden vor, der sich nicht weiter ausbreitet. Bei Vorliegen entsprechender Voraussetzungen, wie z. B. eine stationäre Schadstofffahne mit einer relativ geringen Ausdehnung, ist es erwägenswert zu prüfen, ob die Möglichkeit besteht, auf eine herkömmliche Altlastensanierung zu verzichten. Die damit verbundene Kostenreduzierung kann erheblich sein und insbesondere auch eine Fokussierung der begrenzten finanziellen Mittel auf wirklich brisante Fälle ermöglichen.
 
Abstract: Natural attenuation and reduction processes (Natural Attenuation, NA) can slow down of pollutants in aquifers or stop the spreading. Ammonium, which is to be observed frequently as a groundwater contamination of former deposits, can be classified as microbiologically good degradably and from there in principle for MNA concepts very well suitably.
 
Keywords: Natural Attenuation, waste site, ammonium, investigation

Schlagworte: Natual Attenution, Hausmülldeponie, Ammonium, Erkundung



Copyright: © Bayerisches Landesamt für Umwelt
Quelle: 5. Bodenschutztage Marktredwitz 2008 (Oktober 2008)
Seiten: 6
Preis: € 0,00
Autor: Dr.-Ing Wolfgang Kohler

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