Bio-mining of Lanthanides from Red Mud by Green Microalgae

0508264 - BÚ 2020 RIV CH eng J - Journal Article
Čížková, M. - Mezricky, D. - Rucki, M. - Tóth, T. M. - Náhlík, V. - Lanta, Vojtěch - Bišová, K. - Zachleder, V. - Vítová, M.
Bio-mining of Lanthanides from Red Mud by Green Microalgae.
Molecules. Roč. 24, č. 7 (2019), č. článku 1356. E-ISSN 1420-3049
Institutional support: RVO:67985939
Keywords : red mud * lanthanides * microalgae
OECD category: Microbiology
Impact factor: 3.267, year: 2019
Method of publishing: Open access

Red mud is a by-product of alumina production containing lanthanides. Growth of green microalgae on red mud and the intracellular accumulation of lanthanides was tested. The best growing species was Desmodesmus quadricauda (2.71 cell number doublings/day), which accumulated lanthanides to the highest level (27.3 mg/kg/day), if compared with Chlamydomonas reinhardtii and Parachlorella kessleri (2.50, 2.37 cell number doublings and 24.5, 12.5 mg/kg per day, respectively). With increasing concentrations of red mud, the growth rate decreased (2.71, 2.62, 2.43 cell number doublings/day) due to increased shadowing of cells by undissolved red mud particles. The accumulated lanthanide content, however, increased in the most efficient alga Desmodesmus quadricauda within 2 days from zero in red-mud free culture to 12.4, 39.0, 54.5 mg/kg of dry mass at red mud concentrations of 0.03, 0.05 and 0.1%, respectively. Red mud alleviated the metal starvation caused by cultivation in incomplete nutrient medium without added microelements. Moreover, the proportion of lanthanides in algae grown in red mud were about 250, 138, 117% higher than in culture grown in complete nutrient medium at red mud concentrations of 0.03, 0.05, 0.1%. Thus, green algae are prospective vehicles for bio-mining or bio-leaching of lanthanides from red mud.
Permanent Link: http://hdl.handle.net/11104/0299222