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This article in JEQ

  1. Vol. 41 No. 3, p. 647-653
     
    Received: Apr 8, 2011
    Published: May, 2012


    * Corresponding author(s): saege@biology.sdu.dk
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doi:10.2134/jeq2011.0134

Crushed Concrete as a Phosphate Binding Material: A Potential New Management Tool

  1. Sara Egemose *a,
  2. Melanie J. Sønderupa,
  3. Malde V. Beinthina,
  4. Kasper Reitzela,
  5. Carl Christian Hoffmannb and
  6. Mogens R. Flindta
  1. a Institute of Biology, Univ. of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark
    b Institute of Bioscience, Aarhus Univ., Vejlsøvej 25, DK-8600 Silkeborg, Denmark. Assigned to Associate Editor Ray Bryant

Abstract

To avoid eutrophication of receiving waters, effective methods to remove P in urban and agricultural runoff are needed. Crushed concrete may be an effective filter material to remove dissolved and particulate P. Five types of crushed concrete were tested in the laboratory to evaluate the retention capacity of dissolved P. All types removed P very effectively (5.1–19.6 g P kg−1 concrete), while the possible release of bound P varied between 0.4 and 4.6%. The retention rate was positively related to a decreasing concrete grain size due to an increasing surface area for binding. The P retention was also related to a marked increase in pH (up to pH 12), and the highest retention was observed when pH was high. Under these circumstances, column experiments showed outlet P concentrations <0.0075 mg P L−1. Furthermore, experiments revealed that release of heavy metals is of no importance for the treated water. We demonstrate that crushed concrete can be an effective tool to remove P in urban and agricultural runoff as filter material in sedimentation/infiltration ponds provided that pH in the treated water is neutralized or the water is diluted before outlet to avoid undesired effects caused by the high pH.

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Copyright © 2012. Copyright © by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America, Inc.