2007:04 Hantering av förpackat livsmedelsavfall - Avfall Sverige

DEWASTER ® - Sorting out the problems of mixed waste
Appendix 2: The DEWASTER® process applied to unsorted MSW in Odense, Denmark
In 2003 a project study funded by the Danish electricity company ELSAM and the Danish EPA (Environmental
Protection Agency; Miljøstyrelsen) and NLM Combineering ApS was carried out to determine
whether DEWASTER® system was capable of treating unsorted MSW.
EWOC A/S supplied and operated the DEWASTER® plant used during the project and NLM Combineering
ApS was the project manager. The project was monitored by a steering group consisting of
further representatives of interested parties, including the Technical University of Denmark.
The final report of the project study was published by the Danish EPA in early summer of 2004 as
Environmental Project 932/2004 ”Central sortering af dagrenovation” (”Central sorting of Municipal
Solid Waste”). The report (in Danish with a comprehensive summary in English) is availble at the
EWOC home page (www.ewoc.dk).
The following provides an overwiew of some of the main elements and findings of the Danish EPA
project.
Process design
During the EPA project the DEWASTER® system was used on a total of 400 tonnes of unsorted MSW
from the city of Odense, Denmark. The basic process design employed may be illustrated by the following
diagram.
Receiving bin
MSW
Mass balances
Bag opener
Bulk refuse
Screen
Screen fraction
Magnet
Metal
Desizer®
Oversize
Dewaster®
Reject Biopulp
The mass balances of separated fractions calculated as the average figures for treatment of 400 tonnes
of unsorted MSW was as follows:
Screen fraction
(pre-sorting
reject)
36,9%
Metal
2,1%
Oversize
0,2%
Biopulp
23,0%
Bulk refuse
0,3%
Press reject
37,4%
Please note that the mass balances for the operation of the DEWASTER® process depends largely
on the composition of the MSW treated. Experience shows that due to differences in consumption and
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