Growth stimulation of sulfur oxidizing bacteria for optimization of metal leaching efficiency of fly ash from municipal solid waste incineration |
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| Affiliation: | 1. Department of Microbiology, Institute of Plant Biology, University of Zurich, Zollikerstrasse 107, CH-8008 Zurich, Switzerland;2. Institute of Environmental Sciences, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland;1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;2. Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources, Central South University, Changsha 410083, China;1. Institute of Applied Microbiology, Justus-Liebig University, IFZ, Heinrich-Buff-Ring 26-32, Gießen, Germany;2. Fraunhofer ISC, Fraunhofer Project Group IWKS, Alzenau and Hanau, Germany;1. School of Resources and Environmental Engineering, Shanghai Polytechnic University, Shanghai, P.R. China;2. Shanghai Collaborative Innovation Centre for WEEE Recycling, Shanghai, P.R. China;1. Université Paris-Est, Laboratoire Géomatériaux et Environnement (EA 4508), UPEM, 77454 Marne-la-Vallée, France;2. UNESCO-IHE Institute for Water Education, P.O. Box 3015, 2601 DA Delft, The Netherlands;3. Université de Limoges, Groupement de Recherche Eau Sol Environnement (EA 4330), Faculté des Sciences et Techniques, 123 Avenue A. Thomas, 87060 Limoges Cedex, France;4. University of Wroclaw, Institute of Geological Sciences, Cybulskiego 30, 50-205 Wrocław, Poland;1. Food, Water, Waste Research Group, Faculty of Engineering, University of Nottingham, University Park, Nottingham, NG7 2RD, UK;2. Dipartimento di Scienze del Sistema Terra e Tecnologie per l’Ambiente, National Research Council, ISMAR-CNR, via Piero Gobetti 101, 40129, Bologna, Italy;3. Dipartimento di Scienze Biologiche Geologiche e Ambientali, BiGeA, Alma Mater Studiorum -Università di Bologna, Piazza di Porta San Donato 1, 40126, Bologna, Italy;4. Dipartimento di Chimica \"Giacomo Ciamician\", Alma Mater Studiorum - Università di Bologna, Via Selmi 2, 40126, Bologna, Italy |
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| Abstract: | Sulfur oxidizing bacteria were used to leach metals bound in municipal solid waste incineration fly ash. Pure or mixed cultures of Thiobacilli with or without addition of anoxic sewage sludge were incubated with various amounts of fly ash for several weeks. Co-cultures with Thiobacilli and sewage sludge grew faster than pure cultures of T. thiooxidans or cultures with only sewage sludge as inoculum. The addition of sewage sludge increased the rate of growth of sulfur oxidizing bacteria and simultaneously enhanced the acidification of the suspension. As a result, the time for fly ash processing was reduced by 50%. Thiobacilli were able to grow in the presence of up to 8% (w/v) fly ash. Depending on the amounts of fly ash added, the final pH, and the concentration of sulfuric acid formed, different amounts of metals were leached: over 80% for Cd, Cu, and Zn, 60% for Al and approx. 30% for Fe and Ni (totally, approx. 50% of the heavy metals present in the fly ash) were extracted. |
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