From hazardous waste incineration (HWI) in rotary kilns ashes are generated as solid residues. In this thesis the effect of limestone addition to HWI-ashes was examined for the elution behaviour of heavy metals after a temperature treatment. Experimental results were compared to theoretic modelling. After treatment at 1200°C, the typical temperature for hazardous waste incineration, a minimum of heavy metal leaching from HWI-ashes was found at CaO-contents between 15 and 20%. On the one hand, lower melting temperatures of the ashes were measured after limestone addition. The melting process may lead to immobilisation of heavy metals in glassy phases of the ash. On the other hand, thermodynamic equilibrium calculations prove the decrease of the solubility of heavy metals as for example zinc, lead and chromium due to a changed chemical speciation. In future a HWI-ash optimised with regard to heavy metal leaching could be disposed off to lower landfilling costs, so that the incineration costs of hazardous waste in rotary kilns may also decrease.
| Identifer | oai:union.ndltd.org:DUETT/oai:DUETT:duett-05252001-095712 |
| Date | 25 May 2001 |
| Creators | Reich, Jens |
| Contributors | Prof. Dr.rer.nat. Jan-Dirk Herbell |
| Publisher | Gerhard-Mercator-Universitaet Duisburg |
| Source Sets | Dissertations and other Documents of the Gerhard-Mercator-University Duisburg |
| Language | German |
| Detected Language | English |
| Type | text |
| Format | text/html, application/pdf |
| Source | http://www.ub.uni-duisburg.de/ETD-db/theses/available/duett-05252001-095712/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. Hiermit erteile ich der Universitaet Duisburg das nicht-ausschliessliche Recht unter den unten angegebenen Bedingungen, meine Dissertation, Staatsexamens- oder Diplomarbeit, meinen Forschungs- oder Projektbericht zu veroeffentlichen und zu archivieren. Ich behalte das Urheberrecht und das Recht das Dokument zu veroeffentlichen und in anderen Arbeiten weiterzuverwenden. |
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