Microbial transformation of uranium in wastes

Conference · Sun Jan 01 00:00:00 EST 1989

OSTI ID:5329930

Francis, A J; Dodge, C J; Gillow, J B; Cline, J E ^[1]

---

1. Brookhaven National Lab., Upton, NY (USA)

Contamination of soils, water, and sediments by radionuclides and toxic metals from the disposal of uranium processing wastes is a major national concern. Although much is known about the physico- chemical aspects of U, we have little information on the effects of aerobic and anaerobic microbial activities on the mobilization or immobilization of U and other toxic metals in mixed wastes. In order to understand the mechanisms of microbial transformations of uranium, we examined a contaminated pond sediment and a sludge sample from the uranium processing facility at Y-12 Plant, Oak Ridge, TN. The uranium concentration in the sediment and sludge samples was 923 and 3080 ug/g dry wt, respectively. In addition to U, the sediment and sludge samples contained high levels of toxic metals such as Cd, Cr, Cu, Hg, Pb, Ni, and Zn. The association of uranium with the various mineral fractions of the sediment and sludge was determined by selective chemical extraction techniques. Uranium was associated to varying degrees with the exchangeable carbonate, iron oxide, organic, and inert fractions in both samples. Initial results in samples amended with carbon and nitrogen indicate immobilization of U due to enhanced indigenous microbial activity under anaerobic conditions. 23 refs., 4 figs., 5 tabs.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5329930
• Report Number(s): BNL-43483; CONF-891120-8; ON: DE90004191; TRN: 90-004414
• Resource Relation: Conference: Migration '89: 2nd international conference on chemistry and migration behavior of actinides and fission products in the geosphere, Monterey, CA (USA), 6-10 Nov 1989
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
RADIOACTIVE WASTES
ENVIRONMENTAL IMPACTS
URANIUM
BIODEGRADATION
ENVIRONMENTAL EXPOSURE
GROUND WATER
MICROORGANISMS
OXIDOREDUCTASES
SOIL CHEMISTRY
ACTINIDES
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
ELEMENTS
ENZYMES
HYDROGEN COMPOUNDS
MATERIALS
METALS
OXYGEN COMPOUNDS
RADIOACTIVE MATERIALS
WASTES
WATER
052001* - Nuclear Fuels- Waste Processing
053000 - Nuclear Fuels- Environmental Aspects