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Initial feasibility assessment of potential applications for valorisation of shredder fines: A Swedish case study on gate requirements and legislative conditions
Linköping University, Department of Management and Engineering, Environmental Technology and Management. Linköping University, Faculty of Science & Engineering. (Resource 2.0)ORCID iD: 0000-0002-4810-2319
Linköping University, Department of Management and Engineering, Environmental Technology and Management. Linköping University, Faculty of Science & Engineering. (Resource 2.0)
Linköping University, Department of Management and Engineering, Environmental Technology and Management. Linköping University, Faculty of Science & Engineering. (Industrial and Urban Symbiosis)ORCID iD: 0000-0003-0157-6573
Linköping University, Department of Management and Engineering, Business Administration. Linköping University, Faculty of Arts and Sciences.ORCID iD: 0000-0002-2787-8417
2018 (English)Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

Shredder fines is a residue of the shredding industry and is currently landfilled or used as landfill cover in Sweden. Throughout the time, the heterogeneity and small particle size have rendered resource recovery and recycling of it challenging. In spite of that, European policies envisioning circular economy, in concomitance with stringent resource recovery requirements and increased landfill taxes are challenging the current disposal practices of the shredding industry. As an attempt to address this issue, the present study has developed a systematic approach for performing an initial assessment of the feasibility of several selected mainstream applications for valorisation of shredder fines.

First, sampling of shredder fines from a major shredding plant was obtained twice a week over a 10 weeks period. The main focus of the sampling program was to encompass the variation in the material’s physical and chemical composition. The two samples from each week were then mixed and divided into six subsamples. That is, one original fraction and five size fractions; ZA (7.10-5.00 mm), ZB (5.00-3.35 mm), ZC (3.35-2.00 mm), ZD (2.00-0.25 mm), and ZE (0.25-0.063 mm). These sub-samples were subsequently sent for laboratory analysis for characterisation of contaminants, potentially valuable metals and energy recovery related properties. Second, three potential main stream applications for shredder fines were identified based on existing research on similar industrial residues (e.g. municipal waste incineration bottom ash) and current practices of the Swedish shredding industry. The selected applications are; Smelting for copper, Energy recovery in cement kilns and municipal solid waste incinerators, and Substitution of aggregates in concrete making and road construction. Third, the gate requirements of potential users and legislative requirements with regards to the identified applications were established, and the characteristics of shredder fines were benchmarked against them.

As far as copper smelting is concerned, the presence of high concentrations of lead and chromium is the biggest challenge. Otherwise, the fractions; ZA, ZB, and ZD show some potential due to manageable concentrations of arsenic, cadmium, and mercury. Concerning energy recovery, the calorific value apparently narrows down the options to municipal waste incinerators. There, the chlorine concentration only allows utilisation of the ZC fraction whereas heavy metal concentrations are too high with regards to all the fractions. With regards to the use as substitute material in construction, legislative requirements in Sweden for total content and leachate content of metals are too strict for shredder fines.

In conclusion, the benchmarking reveals the need for prior upgrading of shredder fines with respect to the different applications. Thus, integrated upgrading processes that could handle the complexity of the material in terms of contaminants and valuable recoverables is needed in order to achieve holistic valorisation of the material.

Place, publisher, year, edition, pages
2018.
Keywords [en]
Shredder fines, Feasibility, Circular economy
National Category
Other Engineering and Technologies not elsewhere specified
Identifiers
URN: urn:nbn:se:liu:diva-153272OAI: oai:DiVA.org:liu-153272DiVA, id: diva2:1269080
Conference
ISWA 2018 World Congress, Kuala Lumpur, Malaysia, 22-24 October, 2018
Available from: 2018-12-07 Created: 2018-12-07 Last updated: 2018-12-13Bibliographically approved

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Gunaratne, TharakaKrook, JoakimEklund, MatsAndersson, Hans

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