Residual waste analysed in Styria
ARGE Ingenieurgemeinschaft Innovative Umwelttechnik GmbH (IUT) and Saubermacher Dienstleistungs AG (SDAG) were engaged by the Office of the Styrian State Government, A14 Division of Waste Management and Sustainability
to conduct state-wide sorting analysis of residual waste. These were
conducted on the basis of the analysis performed in 1993/94, 1997/1998,
2002/2003 and 2008. A proportion of the costs were borne by ARA Altstoff
Recycling Austria AG.
In order to take into account seasonal variations, the analysis were conducted in three sessions:
- October/November 2012 (preliminary heating period)
- February/March 2013 (heating period)
- July/August 2013 (non-heating period)
For the random sampling plan sub-districts were selected within all the districts in Styria and the individual communities to be sampled were assigned to a rural or urban structure. A total of 104 part samples of about 1.0 m3 each were studied. The random samples were put through a 40 mm screen at a central sorting site in Graz. The oversize material was sorted by hand into 45 fractions. The material that passed through the screen was then put through a 20 mm screen and the 20 to 40 mm fraction was also sorted by hand. For the samples of over 20 mm, the water content, the weight loss on combustion and the calorific value were determined in the laboratory.
The results were subjected to a comprehensive assessment so as to detect any seasonal and structurally determined differences and changes compared with the prior sorting analyses performed. Comparisons were also carried out with separately collected packaging waste and scrap materials so as to be able to judge the efficiency of the separate collection systems. The detailed results yield information for evaluating the effectiveness of waste management measures already in place and provide bases for future decisions.