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Research topics

Biological sulphur recovery, bioleaching

Research unit

Bio- and Circular Economy Research Group

Research fields

Biological recovery, biomining, bioremediation


Tampere University

Research career

2019- Doctoral Researcher (biological sulphur production), Tampere University

2018-2019 Project Researcher (biological sulphur production from industrial stream),Tampere University of Technology

2017-2018 Research Assistant (thesis work on biological iron-oxidation), Tampere University of Technology

2014 Thesis Researcher (bioremediation of heavy metals), Ostfalia University of Applied Sciences, Germany

Selected publications

Hajdu-Rahkama, R., Puhakka, J.A. (2022). High tolerance of chemolithoautotrophic sulphur oxidizing bacteria towards pulp and paper mill wastewaters and their organic constituents supporting sulphur recovery in alkaline conditions. Chemical Engineering Journal, 137972. DOI: 10.1016/j.cej.2022.137972

Määttä, L., Hajdu-Rahkama, R., Oinonen, C., & Puhakka, J. A. (2022). Effects of metal extraction liquors from electric vehicle battery materials production on iron and sulfur oxidation by heap bioleaching microorganisms. Minerals Engineering, 178, 107409. DOI: 10.1016/j.mineng.2022.107409

Hajdu-Rahkama, R., Özkaya, B., Lakaniemi, A. M., & Puhakka, J. A. (2021). Potential of biological sulphur recovery from thiosulphate by haloalkaliphilic Thioalkalivibrio denitrificans. Environmental Technology, 1-39, DOI: 10.1080/09593330.2021.1985620

D’Aquino, A., Hajdu-Rahkama, R., & Puhakka, J. A. (2021). Elemental sulphur production from thiosulphate under haloalkaline conditions in a Thioalkalivibrio versutus amended fluidized bed bioreactor. Biochemical Engineering Journal, 108062. DOI: 10.1016/j.bej.2021.108062

Mahmood, M., Taki, S., Nakai, S., Gotoh, T., Nishijima, W., Umehara, A., ... & Puhakka, J. A. (2021). Increase in sedimentary organic carbon with a change from hypoxic to oxic conditions. Marine Pollution Bulletin, 168, 112397. DOI: 10.1016/j.marpolbul.2021.112397

Hajdu-Rahkama, R., Özkaya, B., Lakaniemi, A. M., & Puhakka, J. A. (2020). Kinetics and modelling of thiosulphate biotransformations by haloalkaliphilic Thioalkalivibrio versutus. Chemical Engineering Journal, 401, 126047. DOI: 10.1016/j.cej.2020.126047

Hajdu-Rahkama, R., Ahoranta, S., Lakaniemi, A. M., & Puhakka, J. A. (2019). Effects of elevated pressures on the activity of acidophilic bioleaching microorganisms. Biochemical Engineering Journal, 150, 107286. DOI: 10.1016/j.bej.2019.107286