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Optimization Routes for the Bioleaching of MSWI Fly and Bottom Ashes Using Microorganisms Collected from a Natural System

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Abstract

This paper presents a route for the treatment of MSWI fly (FA) and bottom ashes (BA) using microorganisms to critically assess whether bioleaching is within reach of effective industrial application. The leaching of metals from BA and FA was investigated in a controlled laboratory environment using a culture isolated from a natural system where the dominant strains are acidophilic bacteria, mainly Acidothiobacillus thiooxidans and Acidothiobacillus ferrooxidans. The community of microorganisms (mostly acidophilic, S- and Fe-oxidizing bacteria) was collected directly from overflows and ponds at the sediment–water interface of a natural system near a post-mining site. Pre-cultivation was done in 250 mL flasks followed by the adaptation to the different substrates (both FA and BA). The effect of different material pre-treatment and elemental sulphur concentrations were evaluated for both BA and FA, at a starting pH of 4. The bioleaching of BA and FA substrates experienced good yields of metal extraction with an optimum duration of two weeks. The results showed that more than 90% Zn, Cu, and 10% Pb are removed from FA; while 100% Cu, 80% Zn and 20% Pb are removed from BA samples. Batch experiments with regenerating ion-exchange resins did not perform well for metal recovery, but could serve as a valuable decontamination step. The techniques used here with FA and BA can be used for urban mining purposes (e.g. ashes and other meal-rich anthropogenic wastes), but also low-grade ores in the mining industry, contributing to resource recovery or decontamination agendas.

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Acknowledgement

The financial support by United Kingdom Natural Environment Research Council (NERC: NE/K015648/1), Resource Recovery from Waste programme (NE/L014211/1) is acknowledged. The Royal Society fellowship 2016 (Accademia Nazionale dei Lincei) and the SIMP-2016 research grant (Società Italiana di Mineralogia e Petrografia) to V.F. sustained this joint research. Chemical analyses were greatly assisted by Bob Knight and Michael Thompson. Thanks to Mark Anderson, Kim Rosewell and Elena Lucca for laboratory assistance.

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Authors and Affiliations

  1. Dipartimento di Scienze Biologiche Geologiche e Ambientali, BiGeA, Università di Bologna, Piazza di Porta San Donato 1, 40126, Bologna, Italy

    V. Funari & E. Dinelli

  2. Istituto di Scienze Marine, Consiglio Nazionale delle Ricerche, ISMAR-CNR, via Gobetti 101, 40129, Bologna, Italy

    V. Funari & M. Rovere

  3. Food, Water, Waste Research Group, Faculty of Engineering, University of Nottingham, University Park, Nottingham, NG7 2RD, UK

    H. I. Gomes

  4. Dipartimento di Farmacia e Biotecnologie, FaBiT, Università di Bologna, Via Irnerio 42, 40126, Bologna, Italy

    M. Cappelletti & S. Fedi

  5. Department of Geography, Geology and Environment, University of Hull, Cottingham Road, Hull, HU6 7RX, UK

    H. I. Gomes, M. Rogerson & W. M. Mayes

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  1. V. Funari
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  2. H. I. Gomes
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  3. M. Cappelletti
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  4. S. Fedi
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  5. E. Dinelli
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  6. M. Rogerson
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  7. W. M. Mayes
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  8. M. Rovere
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Correspondence to V. Funari.

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Funari, V., Gomes, H.I., Cappelletti, M. et al. Optimization Routes for the Bioleaching of MSWI Fly and Bottom Ashes Using Microorganisms Collected from a Natural System. Waste Biomass Valor 10, 3833–3842 (2019). https://doi.org/10.1007/s12649-019-00688-9

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