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This article in JEQ

  1. Vol. 8 No. 2, p. 207-210
     
    Received: May 30, 1978


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doi:10.2134/jeq1979.00472425000800020014x

Phosphates in Soils Treated with Sewage Water: IV. Bonding of Phosphate from Sewage Water in Sand Columns Containing Aluminum Hydroxide1

  1. W. H. Van Riemsdijk,
  2. J. Beek and
  3. F. A. M. De Haan2

Abstract

Abstract

The reaction of phosphate (P) with Al(OH)3 can be distinguished by adsorption and a process designated here as long-term reaction. The long-term reaction may remove several times the amount of P removed initially. No long-term reaction of P (0.5 mmol/liter) and Xray amourphous Al(OH)3 was detected at pH 8. To columns of quartz sand mixed with Al(OH)3 domestic sewage water (pH ≅ 8) was added during 10 mo once every 2 weeks. The phosphate retention in these columns was much higher than could be expected from the pure Al(OH)3 system experiments, indicating the occurrence of a long-term reaction. Column segments were analyzed for organic-, (Al + Fe)-, and Ca-P. Negligible Ca-P was formed. Electron microscopy and Xray analysis showed quartz particles, Al-containing particles with no detectable P, and particles containing Al, P, and Ca. Formation of the Al-P-Ca particles contributes to the capacity of soils to store or retain P.

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