Author:
Safonov Alexey,Lavrinovich Elena,Emel’yanov Alexander,Boldyrev Kirill,Kuryakov Vladimir,Rodygina Natalia,Zakharova Elena,Novikov Alexander
Abstract
AbstractThe possible role of biogeochemical processes in the transport of colloidal and pseudo-colloidal U, Np, and Pu during bioremediation of radionuclide- and nitrate-contaminated groundwater was investigated. In two laboratory experiments with water samples taken from contaminated aquifers before and post bioremediation, we found that microbial processes could cause clayed, ferruginous, and actinide colloids to coagulate. The main mechanisms are biogenic insoluble ferrous iron species formations (goethite, pyrrhotite, siderite, troilite, and ferrihydrite), the aggregation of clay particles by microbial metabolites, and the immobilization of actinides in the bacterial cells, large polymers, and iron and clayed sediments. This process decreases the risk of colloidal and pseudo-colloidal transport of actinides.
Funder
Ministry of Science and Higher Education of the Russian Federation
Publisher
Springer Science and Business Media LLC
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