Landfill mining in practice: Dismantling of the old dump Kössen / Austria

This case study presents in its first part a hands-on assessment of the content of a former landfill which was operated between 1920 and 1985 and accepted all municipal waste streams generated in a predominantly rural environment with tourism as a main economic factor. The assessment was performed – according to the principle “let´s replace assumptions by knowledge” – prior to the complete removal of the landfill Content (volume about 50.000 m3).
The second part gives an overview on the excavation and separation works itself which have been triggered by flood events in summer 2013 (Kössen, a small town located on a river emptying into Chiemsee in Bavaria was the municipality mostly affected by this flood in Western Austria).

The former landfill “Auwirtslacke” is located in Kössen, a Tyrolean municipality directlyon the river Kitzbüheler Ache (in Germany: Tiroler Ache) which flows into Chiemsee, a large lake in Bavaria. It was operated for all kinds of municipal solid waste between end of World War I and the mid 1980ies without whichever emission control. As a part of mayor flood protection measures in the area it was decided to remove the entire landfill (volume about 50.000 m3) in order to give the river more space. The excavation works which are followed by screening and sorting the entire landfill Content started in July 2014 and are scheduled to be finished in May/June 2015.

2 Exploration Phase
In order to have a sound estimate on disposal cost before starting the excavation works a complex assessment on the physical landfill content and its composition to be expected was performed, consisting of
• the evaluation of historical data (which turned out as relatively fruitful compared to similar cases)
• interviews with former operating staff and finally
• the digging of trenches – total length about 800 m, distance between trenches 10and 15 m – on the entire surface down to the landfill body´s bottom.



Copyright: © Wasteconsult international
Source: Waste-to-Resources 2015 (Mai 2015)
Pages: 6
Price: € 3,00
Autor: Dipl.-Ing. Martin Steiner

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