Presence of contaminants in wood waste for recycling

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Introduction
The need for a circular economy has gained large importance and is considered one of the top priorities in the Sustainable Development Goals (SDG) formulated by the European Union (EU) (EC, 2015). In this context, material recycling of post-consumer waste is seen as the preferred option to high value discarded items. However, one of the challenges to the circular economy is the presence of impurities within the recyclables. Indeed, impurities could re-enter the product’s life cycle along with the targeted material (risk-cycling). Therefore, information on levels of impurities in recyclable waste fractions is needed to quantify and address the problem. Among recyclable fractions, wood waste occurs in large amounts from applications such as packaging, buildings, construction, demolition, and furniture. The main end of life option for wood waste has historically been incineration, due to its high calorific value. However, cascading the resource’s uses is necessary in order to apply a circular economy approach and extend the product’s life cycle. Therefore, recycling is the preferred treatment option for post-consumer wood waste, which is generally chipped and processed to produce particleboard. Since wood waste is often associated with material and chemical impurities (Edo et al., 2016), investigations are needed to ensure high quality, clean and safe recycling loops.
The aim of this study is to evaluate levels of material and chemical impurities in post-consumer wood waste from a recycling perspective.
Material and Methods
Data on composition of impurities within wood waste come from a sampling campaign from recycling centers in Denmark. Material impurities were investigated, and were found to account up to 22% of the collected material. Concentration levels of selected chemical elements and persistent organic pollutants were analysed. Their concentration appeared to vary according to application use of the waste wood, being generally higher for wood waste from the demolition and the furniture sector. The presence of chemical contaminants was linked to material impurities as well as to treatment of the wood items with preservatives, paints, and finishes. Results were used to investigate the consequences that presence of such impurities have on recycling chain of wood waste.
Results and Conclusions
The presentation will address preliminary findings from presence of material and chemical impurities in the wood waste as a basis to frame the challenge that risk-cycling may constitute to a (almost) closed circular economy.
Original languageEnglish
Publication date2018
Number of pages2
Publication statusPublished - 2018
Event2nd Conference on Life Cycle Assessment of Waste: Integrated Residual Resource Management and Assessment - Borupgaard, Snekkersten, Denmark
Duration: 18 Jun 201822 Jun 2018
Conference number: 2
http://www.wastelca.org/

Conference

Conference2nd Conference on Life Cycle Assessment of Waste
Number2
LocationBorupgaard
CountryDenmark
CitySnekkersten
Period18/06/201822/06/2018
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    Research areas

  • Wood waste management, Global warming potential, Dynamic LCA, Cascading utilization

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