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Influence of leaching conditions for ecotoxicological classification of ash
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
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2014 (English)In: Waste Management, ISSN 0956-053X, E-ISSN 1879-2456, Vol. 34, no 2, 421-429 p.Article in journal (Refereed) Published
Abstract [en]

The Waste Framework Directive (WFD; 2008/98/EC) states that classification of hazardous ecotoxicological properties of wastes (i.e. criteria H-14), should be based on the Community legislation on chemicals (i.e. CLP Regulation 1272/2008). However, harmonizing the waste and chemical classification may involve drastic changes related to choice of leaching tests as compared to e.g. the current European standard for ecotoxic characterization of waste (CEN 14735). The primary aim of the present study was therefore to evaluate the influence of leaching conditions, i.e. pH (inherent pH (similar to 10), and 7), liquid to solid (L/S) ratio (10 and 1000 L/kg) and particle size (<4 mm, <1 mm, and <0.125 mm), for subsequent chemical analysis- and ecotoxicity testing in relation to classification of municipal waste incineration bottom ash. The hazard potential, based on either comparisons between element levels in leachate and literature toxicity data or ecotoxicity testing of the leachates, was overall significantly higher at low particle size (<0.125 mm) as compared to particle fractions <1 mm and <4 mm, at pH 10 as compared to pH 7, and at L/S 10 as compared to L/S 1000. These results show that the choice of leaching conditions is crucial for H-14 classification of ash and must be carefully considered in deciding on future guidance procedures in Europe.

Place, publisher, year, edition, pages
2014. Vol. 34, no 2, 421-429 p.
Keyword [en]
Ash, Hazardous waste, H-14 classification, Ecotoxicity tests, CLP Regulation, Waste Framework Directive
National Category
Environmental Sciences
URN: urn:nbn:se:su:diva-102269DOI: 10.1016/j.wasman.2013.10.041ISI: 000331497400021OAI: diva2:709003


Available from: 2014-03-31 Created: 2014-03-31 Last updated: 2014-03-31Bibliographically approved

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Stiernström, SaraBreitholtz, Magnus
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