Optimized biogenic sulfuric acid production and application in the treatment of waste incineration residues

Investor logo

Warning

This publication doesn't include Faculty of Medicine. It includes Faculty of Science. Official publication website can be found on muni.cz.

Authors

KREMSER Klemens MALTSCHNIG Melanie SCHÖN Herta JANDRIC Aleksander GAJDOŠÍK Martin VACULOVIČ Tomáš KUČERA Jiří GUEBITZ Georg M.

Year of publication 2022
Type Article in Periodical
Magazine / Source Waste Management
MU Faculty or unit

Faculty of Science

Citation
Web https://www.sciencedirect.com/science/article/pii/S0956053X2200160X#!
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
Description 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.
Related projects:

You are running an old browser version. We recommend updating your browser to its latest version.

More info