Removal of Metals and Radionuclides Using Apatite and Other Natural Sorbents

Treatment of waste water for removal of low levels of actinides, particularly plutonium, uranium, and americium, and hazardous metals has been and continues to be a challenge. This study evaluated the use of apatite and other natural materials for use as sorbents to treat water streams containing As, Am, Pu, Se, Tc, and U. Nine sorbents were tested including natural and synthetic apatites, tri-calcium phosphate, bone char, and activated magnetite. The sorption properties were tested in batch studies and in column tests. There was moderate sorption of As, Se, Sr, Cs, and Tc, but very good removal of U and Pu by the phosphate adsorbents. The Am results were inconclusive. The synthetic apatites had higher capacities than the natural apatites from phosphate rock and fish bones.

[1]  W. D. Bostick,et al.  Phosphate-induced metal stabilization: Use of apatite and bone char for the removal of soluble radionuclides in authentic and simulated DOE groundwater , 1999 .

[2]  J. Arey,et al.  Immobilization of Uranium in Contaminated Sediments by Hydroxyapatite Addition. , 1999, Environmental science & technology.

[3]  J. Rouchaud,et al.  Sorption of uranium and other heavy metals on hydroxyapatite , 1995 .

[4]  A Newman,et al.  Ranking pesticides by environmental impact. , 1995, Environmental science & technology.

[5]  F. Schwartz,et al.  Sorption of zn2+ and cd2+ on hydroxyapatite surfaces. , 1994, Environmental science & technology.

[6]  J. A. Ryan,et al.  Effects of NO3-, Cl-, F-, SO42-, and CO32- on Pb2+ Immobilization by Hydroxyapatite. , 1994, Environmental science & technology.

[7]  J. A. Ryan,et al.  In situ lead immobilization by apatite , 1993 .

[8]  S. Morrison,et al.  Extraction of uranium and molybdenum from aqueous solutions: a survey of industrial materials for use in chemical barriers for uranium mill tailings remediation , 1992 .

[9]  L. Pietrelli,et al.  New Separation Chemistry Techniques for Radioactive Waste and Other Specific Applications , 1991 .

[10]  T. Narasaraju,et al.  Some physico-chemical aspects of hydroxylapatite , 1996 .

[11]  M. Fédoroff,et al.  Structural Modification of Calcium Hydroxyapatite Induced by Sorption of Cadmium Ions , 1994 .

[12]  M. Larsen,et al.  Defluoridation of drinking water by co-precipitation with apatite. , 1993, Caries research.

[13]  D. Dixon.  Colour and turbidity removal with reusable magnetite particles—VII: A colloid chemistry study of the effect of inorganic ions on the efficiency of clarification , 1984 .

[14]  Takashi Suzuki,et al.  Synthetic hydroxyapatites employed as inorganic cation-exchangers , 1981 .