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Article

Inventory of MSWI Fly Ash in Switzerland: Heavy Metal Recovery Potential and Their Properties for Acid Leaching

1
Institute of Geological Sciences, University of Bern, 3012 Bern, Switzerland
2
Zentrum für Nachhaltige Abfall-und Ressourcennutzung ZAR, 8340 Hinwil, Switzerland
*
Author to whom correspondence should be addressed.
Processes 2020, 8(12), 1668; https://doi.org/10.3390/pr8121668
Received: 30 November 2020 / Revised: 14 December 2020 / Accepted: 15 December 2020 / Published: 17 December 2020
(This article belongs to the Special Issue Advanced Technology of Waste Treatment)
From the year 2021 on, heavy metals from Swiss municipal solid waste incineration (MSWI) fly ash (FA) must be recovered before landfilling. This is predominantly performed by acid leaching. As a basis for the development of defined recovery rates and for the implementation of the recovery process, the authorities and plant operators need information on the geochemical properties of FA. This study provides extended chemical and mineralogical characterization of all FA produced in 29 MSWI plants in Switzerland. Acid neutralizing capacity (ANC) and metallic aluminum (Al0) were additionally analyzed to estimate the effort for acid leaching. Results show that all FA samples are composed of similar constituents, but their content varies due to differences in waste input and incineration conditions. Based on their geochemical properties, the ashes could be divided into four types describing the leachability: very good (6 FA), good (10 FA), moderate (5 FA), and poor leaching potential (8 FA). Due to the large differences it is suggested that the required recovery rates are adjusted to the leaching potential. The quantity of heavy metals recoverable by acid leaching was estimated to be 2420 t/y Zn, 530 t/y Pb, 66 t/y Cu and 22 t/y Cd. View Full-Text
Keywords: MSWI fly ash; properties of fly ash; acid leaching; heavy metal recovery MSWI fly ash; properties of fly ash; acid leaching; heavy metal recovery
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MDPI and ACS Style

Zucha, W.; Weibel, G.; Wolffers, M.; Eggenberger, U. Inventory of MSWI Fly Ash in Switzerland: Heavy Metal Recovery Potential and Their Properties for Acid Leaching. Processes 2020, 8, 1668. https://doi.org/10.3390/pr8121668

AMA Style

Zucha W, Weibel G, Wolffers M, Eggenberger U. Inventory of MSWI Fly Ash in Switzerland: Heavy Metal Recovery Potential and Their Properties for Acid Leaching. Processes. 2020; 8(12):1668. https://doi.org/10.3390/pr8121668

Chicago/Turabian Style

Zucha, Wolfgang, Gisela Weibel, Mirjam Wolffers, and Urs Eggenberger. 2020. "Inventory of MSWI Fly Ash in Switzerland: Heavy Metal Recovery Potential and Their Properties for Acid Leaching" Processes 8, no. 12: 1668. https://doi.org/10.3390/pr8121668

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