Behaviour of uranium in hydroxyapatite-bearing permeable reactive barriers: investigation using 237U as a radioindicator

This study was undertaken to investigate the long-term performance of hydroxyapatite (HAP) as reactive material for the removal of uranium in passive groundwater remediation systems. 237U used as a radioindicator enabled tracking the movement of the contamination front through a test column without...

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Bibliographic Details
Published in:The Science of the total environment 2004-06, Vol.326 (1), p.249-256
Main Authors: Simon, Franz-Georg, Biermann, Vera, Segebade, Christian, Hedrich, Martina
Format: Article
Language:English
Subjects:
Applied sciences
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Exact sciences and technology
Groundwaters
Hydroxyapatite
Natural water pollution
Permeable reactive barriers
Pollution
Pollution, environment geology
Radioindicator
Uranium
Water treatment and pollution
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Summary:This study was undertaken to investigate the long-term performance of hydroxyapatite (HAP) as reactive material for the removal of uranium in passive groundwater remediation systems. 237U used as a radioindicator enabled tracking the movement of the contamination front through a test column without taking samples or dismantling the apparatus. The stoichiometric ratio between uranium and HAP was found to be 1:(487±19). Uranium removal by HAP is of pseudo first-order kinetics and the rate constant was measured to be (1.1±0.1)×10 −3 s −1. HAP can sorb more than 2900 mg/kg uranium. Possible reaction pathways of uranium and HAP are discussed. The data obtained enable the calculation of ideal lifetime for permeable reactive barriers (PRB) using HAP for uranium removal neglecting hydrological factors that may impair the function of PRBs.
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2004.01.005