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Journal of Environmental Quality Abstract -

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


This article in JEQ

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

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



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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