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Evaluering av jordmånsbildande askbehandlingsprocess (EJA): förstudie
2005 (Swedish)Report (Other academic)Alternative title
Evaluation of an accelerated mineralization processfor ashes : feasibility study (English)
Abstract [en]

In Japan, expenses for landfilling yield about 400 US$ per t of ash, which gives an incentive to reduce the amount of landfilled ash. At NIES (National Institute for Environmental Studies) in Tsukuba, Japan, the AMT process (Accelerated Mineralization Technology) was developed aiming at the treatment of ashes and production of soil-like material for reuse. The objective of the project EJA was to evaluate the AMT process on the basis of available information and the possibilities the process could offer with respect to the conditions present in Sweden.With support of researchers at NIES, available literature including unpublished manuscripts on the AMT process was compiled, translated and evaluated. During treatment, the ashes are washed, aged and mixed with up to 5 weight-% of biodegradable organic matter. The material is stabilized at landfill. During up to several decades, metals are demobilized through a combination of three mechanisms, viz. carbonation, clay formation, and humification. Also persistent organic pollutants (POP) are demobilized due to humification products or they are degraded anaerobically. When the treatment is completed, the reuse of the material is envisaged.Due to the long treatment period, the AMT method might not be favored by ash producers in Sweden. In the future, landfill companies could be interested in the technology, since they are experienced to handle waste at long sight. This, however, requires that the legislation does not pose any hindrance for the implementation of the method, e.g. regarding the requirement to add organic matter to the ash. Above all, it remains several years of research on the AMT process to fully understand and evaluate the underlying biological and chemical processes as well as their interaction.

Abstract [sv]

Deponeringskostnaderna i Japan motsvarar ca. 400 US$ per ton aska, vilket ger ekonomiska incitament att minska mängden deponerad aska. Vid NIES (National Institute for Environmental Studies) i Tsukuba, Japan, utvecklades den s.k. AMTprocessen) i Tsukuba, Japan, utvecklades den s.k. AMTprocessen (Accelerated Mineralization Technology) som syftar till att behandla askor och producera ett jordmånsliknande material till återanvändning. Målet med projektet EJA var en värdering av denna AMT-process, utgående från den information som finns tillgänglig idag, och de möjligheter som den skulle kunna erbjuda för de svenska förhållandena.Med hjälp av forskare vid NIES sammanställdes, översattes och värderades befintlig litteratur samt opublicerade manuskript om AMT-processen. Behandlingen innebär att askor tvättas, åldras och blandas med upp till 5 vikt-% komposterbart organiskt avfall. Materialet stabiliseras på deponi. Under upp till flera decennier fastläggs metaller genom en kombination av tre mekanismer: karbonatisering, bildning av leror och humifiering. Även svårnedbrytbara organiska föroreningar, som t.ex dioxiner, skall fastläggas genom humifieringsprodukter eller de skall brytas ned genom anaeroba processer. Efter fullbordad behandling skall materialet återanvändas.Den långa behandlingstiden gör AMT-metoden dock oattraktiv för askproducenter i Sverige. På sikt skulle det däremot kunna finnas intresse hos deponeringsföretag, som har erfarenhet att disponera avfall i större tidrymd. Vilket dock förutsätter att den rådande lagstiftningen inte lägger några hinder för metoden, t.ex. vad gäller nödvändigheten att blanda askan med organiskt material. Dessutom kvarstår flera års forskningsarbete om AMT-processen för att förstå och bedöma de underliggande biologiska och kemiska processer och deras samspel i sin helhet.

Place, publisher, year, edition, pages
Stockholm: Värmeforsk , 2005. , 68 p.
Series
Värmeforsk, ISSN 0282-3772 ; 913
National Category
Other Environmental Engineering
Research subject
Waste Science and Technology
Identifiers
URN: urn:nbn:se:ltu:diva-23861Local ID: 8b737bb0-9b4d-11db-8975-000ea68e967bOAI: oai:DiVA.org:ltu-23861DiVA: diva2:996911
Note
Godkänd; 2005; 20070103 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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