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This article in JEQ

  1. Vol. 40 No. 6, p. 1835-1843
     
    Received: Mar 14, 2011


    * Corresponding author(s): mclark@scu.edu.au
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doi:10.2134/jeq2011.0090

Removal of Radium from Groundwater Using a Modified Bauxite Refinery Residue

  1. M. W. Clark *,
  2. D. J. Akhurst and
  3. L. Fergusson
  1. Southern Cross Environmental Innovations, School of Environmental Science and Management, Southern Cross Univ., Lismore, NSW 2480, Australia

Abstract

Radium (Ra) removal by an unconventional sorbent, a modified bauxite refinery residue (MBRR), is investigated for a groundwater extracted in Missouri, USA. The MBRR treatment causes substantial reductions of both gross α and combined 226/228Ra activities from 0.955 ± 0.005 and 0.66 ± 0.005 Bq L−1 to below detection limits (0.037 Bq L−1 or 1 pCi L−1). Column breakthrough occurs at 0.555 Bq L−1 for gross α and 0.185 Bq L−1 for combined 226/228Ra (15 and 5 pCi L−1; USEPA's maximum contaminant levels) after 54 and 40 d run time, respectively. At 84 d the MBRR media continues to remove 24.3% of raw water gross α and 39.7% of the combined 226/228Ra. The treatment effluent has an initial pH of 10.9, outside the USEPA guides (6.5–8.5); this may be readily mitigated by posttreatment acid injection, or by raw water blending. The MBRR simultaneously removes other potentially hazardous trace elements (e.g., Cu, Zn, and Fe) to extremely low concentrations. In addition, toxicity characteristic leaching procedure testing of spent MBRR suggests that metals are bound tightly, such that it is nonhazardous, permitting cost-effective disposal to landfill without special confinement or storage. Consequently, MBRR may be utilized as an alternative adsorbent for treating Ra-contaminated groundwater.

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Copyright © 2011. Copyright © by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America, Inc.