TY - GEN A1 - Simon, Franz-Georg A1 - Biermann, Vera A1 - Csovári, M. A1 - Csicsák, J. T1 - Uranium removal using elemental iron and hydroxyapatite in permeable reactive barriers T2 - Mine Water and the Environment T2 - 8th International Mine Water Association Congress CY - Johannesburg, Republic of South Africa DA - 2003-10-19 PY - 2003 SN - 0-620-31314-5 VL - 8 SP - 43 EP - 55 PB - International Mine Water Association IMWA CY - Johannesburg AN - OPUS4-2776 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Simon, Franz-Georg A1 - Biermann, Vera A1 - Peplinski, Burkhard T1 - Uranium removal from groundwater using hydroxyapatite JF - Applied geochemistry N2 - The present work shows that U can be effectively removed from groundwater using permeable reactive barriers with hydroxyapatite (HAP) as reactive material. The main factor influencing the removal processes is the composition of the groundwater, namely the concentration of Ca and carbonate. Sorption of U onto the HAP surface seems to be the dominant removal process with the possibility of remobilisation. Newly formed U-phosphate minerals were detected by ESEM/EDX and XRD in samples with high U content indicating either a dissolution-precipitation mechanism or sorption onto the apatite surface followed by alteration of the structure. The formed U-phosphate minerals are stable under common groundwater conditions and can be remobilised only at high pH-values and high carbonate concentrations. KW - Uranium KW - Hydroxyapatite KW - Groundwater remediation KW - XRD PY - 2008 DO - https://doi.org/10.1016/j.apgeochem.2008.04.025 SN - 0883-2927 SN - 1872-9134 VL - 23 IS - 8 SP - 2137 EP - 2145 PB - Elsevier Science CY - Amsterdam AN - OPUS4-17798 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - RPRT A1 - Meggyes, Tamás A1 - Debreczeni, Ákos A1 - Reddy, Krishna R. A1 - Karri, Madhusudhana R. A1 - Riddler, Gordon P. A1 - Roehl, Karl Ernst A1 - Czurda, Kurt A1 - Sarsby, Robert W. A1 - Simon, Franz-Georg A1 - Biermann, Vera T1 - Sustainable environmental protection N2 - Permeable reactive barriers (PRBs) offer an alternative as opposed to more cost-intensive active methods for groundwater remediation, e.g. pump-and-treat. Long-term performance of PRBs, however, is crucial for the technology’s success. The paper summarises the results of long-term column experiments with elemental iron (Fe0) and hydroxyapatite (HAP) as reactive materials for the removal of uranium from groundwater. Good removal results have been achieved using elemental iron with possible reaction paths being reductive precipitation and adsorption on to corrosion products of Fe0. T3 - BAM Forschungsberichtreihe - 280 PY - 2007 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-1710 SN - 978-3-9811655-2-4 SN - 0938-5533 VL - 280 SP - 1 EP - 54 PB - Bundesanstalt für Materialforschung und -prüfung (BAM) CY - Berlin AN - OPUS4-171 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Biermann, Vera A1 - Simon, Franz-Georg A1 - Csövári, M. A1 - Csicsák, J. A1 - Földing, G. A1 - Simoncsics, G. ED - Merkel, B. ED - Hasche-Berger, A. T1 - Long-term performance of reactive materials in PRBs for uranium remediation T2 - Uranium in the environment N2 - Elemental iron (Fe0) and hydroxyapatite (HAP) were evaluated as reactive materials in PRBs for uranium remediation. Laboratory experiments were carried out and a pilot-scale reactive barrier with Fe0 was installed in Pécs (Southern Hungary). Results of 2.5 years of operation are reported. The PRB has a considerable influence on groundwater composition: uranium concentrations decrease from 900 µg/l to <10 µg/l, TDS drop from 1,000 mg/l to 500 mg/l. T2 - 4. Uranium Mining and Hydrogeology Congress CY - Freiberg, Germany DA - 2005-09-11 KW - PRBs KW - Permeable Reaktive Wände KW - Grundwassersanierung KW - Uran PY - 2006 SN - 3-540-28363-3 DO - https://doi.org/10.1007/3-540-28367-6_28 SP - 275 EP - 285 PB - Springer CY - Berlin AN - OPUS4-10886 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Simon, Franz-Georg A1 - Biermann, Vera T1 - Groundwater remediation using permeable reactive barriers JF - Land Contamination & Reclamation KW - Groundwater remediation KW - Uranium KW - Permeable reactive barriers PY - 2007 SN - 0967-0513 VL - 15 IS - 1 SP - 31 EP - 39 PB - EPP Publ. CY - Richmond AN - OPUS4-14620 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Simon, Franz-Georg A1 - Biermann, Vera A1 - Segebade, Christian A1 - Hedrich, Martina T1 - Behaviour of uranium in hydroxyapatite-bearing permeable reactive barriers: investigation using 237U as a radioindicator JF - The science of the total environment N2 - 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. KW - Uranium KW - Permeable reactive barriers KW - Radioindicator KW - Hydroxyapatite PY - 2004 DO - https://doi.org/10.1016/j.scitotenv.2004.01.005 SN - 0048-9697 VL - 326 IS - 1-3 SP - 249 EP - 256 PB - Elsevier CY - Amsterdam AN - OPUS4-3741 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Simon, Franz-Georg A1 - Biermann, Vera ED - Roehl, K. T1 - Behaviour of uranium in elemental iron and hydroxyapatite reactive barriers: column experiments T2 - Long-term performance of permeable reactive barriers KW - Groundwater remediation KW - Permeable Reactive Barrier KW - Long-term Performance KW - Elemental Iron KW - Hydroxyapatite PY - 2005 SN - 0-444-51536-4 N1 - Serientitel: Trace metals and other contaminates in the environment – Series title: Trace metals and other contaminates in the environment IS - 7 SP - 77 EP - 109 PB - Elsevier CY - Amsterdam AN - OPUS4-7544 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -