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@article{1856237,
author = {Kremser, Klemens and Maltschnig, Melanie and Schön, Herta and Jandric, Aleksander and Gajdošík, Martin and Vaculovič, Tomáš and Kučera, Jiří and Guebitz, Georg M.},
article_number = {May},
doi = {http://dx.doi.org/10.1016/j.wasman.2022.03.025},
keywords = {Biogenic sulfuric acid production; Elemental sulfur-oxidation; Mixed acidophilic bacteria; Heap bioleaching; Metal recovery},
language = {eng},
issn = {0956-053X},
journal = {Waste Management},
title = {Optimized biogenic sulfuric acid production and application in the treatment of waste incineration residues},
url = {https://www.sciencedirect.com/science/article/pii/S0956053X2200160X#!},
volume = {144},
year = {2022}
}
TY - JOUR
ID - 1856237
AU - Kremser, Klemens - Maltschnig, Melanie - Schön, Herta - Jandric, Aleksander - Gajdošík, Martin - Vaculovič, Tomáš - Kučera, Jiří - Guebitz, Georg M.
PY - 2022
TI - Optimized biogenic sulfuric acid production and application in the treatment of waste incineration residues
JF - Waste Management
VL - 144
IS - May
SP - 182-190
EP - 182-190
PB - Elsevier
SN - 0956053X
KW - Biogenic sulfuric acid production
KW - Elemental sulfur-oxidation
KW - Mixed acidophilic bacteria
KW - Heap bioleaching
KW - Metal recovery
UR - https://www.sciencedirect.com/science/article/pii/S0956053X2200160X#!
N2 - The biological leaching of metals from different waste streams by bacteria is intensively investigated to address metal recycling and circular economy goals. However, usually external addition of sulfuric acid is required to maintain the low pH optimum of the bacteria to ensure efficient leaching. Extremely acidophilic Acidithiobacillus spp. producing sulfuric acid and ferric iron have been investigated for several decades in the bioleaching of metal-containing ores. Their application has now been extended to the extraction of metals from artificial ores and other secondary sources. In this study, an optimized process for producing biogenic sulfuric acid from elemental sulfur by two sulfur-oxidizing species, A. thiooxidans and A. caldus and their combinations, was investigated in batch and stirred tank experiments. Using a combined culture of both species, 1.05 M and 1.4 M biogenic sulfuric acid was produced at 30 °C and 6% elemental sulfur in batch and semi continuous modes, respectively. The acid produced was then used to control the pH in a heap bioleaching system in which iron- and sulfur-oxidizing A. ferrooxidans was applied to biologically leach metals from waste incineration residuals. Metals like Cu, Ni, Al, Mn, and Zn were successfully recovered by 99, 93, 84, 77 and 68%, respectively within three weeks of heap bioleaching. Overall, a potential value recovery of incorporated metals >70% could be achieved. This highlights the potential and novelty of applying extremely acidophilic sulfur-oxidizing bacteria for cheap and efficient production of biogenic sulfuric acid and its use in pH control.
ER -
KREMSER, Klemens, Melanie MALTSCHNIG, Herta SCHÖN, Aleksander JANDRIC, Martin GAJDOŠÍK, Tomáš VACULOVIČ, Jiří KUČERA and Georg M. GUEBITZ. Optimized biogenic sulfuric acid production and application in the treatment of waste incineration residues. \textit{Waste Management}. Elsevier, 2022, vol.~144, May, p.~182-190. ISSN~0956-053X. Available from: https://dx.doi.org/10.1016/j.wasman.2022.03.025.
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