Institute of Functional Interfaces

P-RoC - Phosphorus Recovery from Wastewater by Crystallisation of Calcium Phosphate Compounds

  • chair:

    Berg, U. / Knoll, G. / Kaschka, E. / Kreutzer, V. / Weidler, P.G., / Nüesch R. (2007)

  • place:

    J. Res. Sci. & Tech. 4 (2007), 3, 117-122

  • Berg, U. / Knoll, G. / Kaschka, E. / Kreutzer, V. / Weidler, P.G., / Nüesch R. (2007): „P-RoC - Phosphorus Recovery from Wastewater by Crystallisation of Calcium Phosphate Compounds“ In: J. Res. Sci. & Tech. 4 (2007), 3, 117-122

Abstract

The P-RoC process-the phosphorus recovery from wastewater by crystallisation of calcium phosphate-was developed in order to simultaneously remove and recover phosphorus (P) from waste-and process waters by applying calcium silicate hydrate (CSH) compounds. Experiments were performed in fixed bed- and stirred reactors, both in laboratory- and semi-technical scale. Total P (P-tot) contents of the crystallisation products of at least 24 wt-% P-tot were achieved.

X-ray diffraction analysis proved the formation of hydroxylapatite (HAP, Ca-5(PO4)(3)OH) using municipal wastewater and of brushite (CaHPO4*2H(2)O) using industrial process water. Reuse options of the generated products as P-rock substitute and/or fertiliser are conceivable.


 

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