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Laboratory Scale Investigations on Heap (Bio)leaching of Municipal Solid Waste Incineration Bottom Ash

1
VTT Technical Research Centre of Finland Ltd, P.O. Box 1000, FI-02044 Espoo, Finland
2
Fortum Waste Solutions, Kuulojankatu 1, FI-11120 Riihimäki, Finland
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(5), 290; https://doi.org/10.3390/min9050290
Received: 25 March 2019 / Revised: 18 April 2019 / Accepted: 6 May 2019 / Published: 11 May 2019
(This article belongs to the Special Issue Recent Advances in Hydro- and Biohydrometallurgy)
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Abstract

Municipal solid waste incineration bottom ash (MSWI BA) is the main output of the municipal solid waste incineration process, both in mass and volume. It contains some heavy metals that possess market value, but may also limit the utilization of the material. This study illustrates a robust and simple heap leaching method for recovering zinc and copper from MSWI BA. Moreover, the effect of autotrophic and acidophilic bioleaching microorganisms in the system was studied. Leaching yields for zinc and copper varied between 18–53% and 6–44%, respectively. For intensified copper dissolution, aeration and possibly iron oxidizing bacteria caused clear benefits. The MSWI BA was challenging to treat. The main components, iron and aluminum, dissolved easily and unwantedly, decreasing the quality of pregnant leach solution. Moreover, the physical nature and the extreme heterogeneity of the material caused operative requirements for the heap leaching. Nevertheless, with optimized parameters, heap leaching may offer a proper solution for MSWI BA treatment. View Full-Text
Keywords: municipal solid waste incineration; bottom ash; heap leaching; bioleaching municipal solid waste incineration; bottom ash; heap leaching; bioleaching
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Mäkinen, J.; Salo, M.; Soini, J.; Kinnunen, P. Laboratory Scale Investigations on Heap (Bio)leaching of Municipal Solid Waste Incineration Bottom Ash. Minerals 2019, 9, 290.

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