Institute of Functional Interfaces

Is Phosphorus Recovery from Waste Water Feasible ?

  • chair:

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

  • place: Env. Tech. (2007), 28, 166-172

  • Date: 2007
  • Berg, U. / Knoll, G. / Kaschka, E. / Weidler, P.G. /  Nüesch, R. (2007): β€žIs Phosphorus Recovery from Waste Water Feasible ?β€œ. In:  Env. Tech. (2007), 28, 166-172

Abstract

Phosphorus (P) recovery from waste water must become a predominant goal of all countries to face the limited resources of this essential nutrient. The induced crystallisation of calcium phosphates straight from the waste water phase applying tobermorite-rich calcium silicate hydrate compounds (CSH) from the construction industry as the trigger material has proved to be a suitable method.

Laboratory and semi-technical scale experiments were carried out in fixed bed, stirred reactor and expanded bed mode. P-loads of the crystallisation substrates of up to 13 wt-% total P (P-tot) (30 wt-% P2O5) were achieved. Recycling options of the generated products, both as substitute for phosphate rock in the phosphate industry and as a new fertiliser in agriculture, were demonstrated.

Indicative operating and investment costs were estimated for conversion of conventional waste water treatment plants (WWTP) designed for nutrient removal and P-precipitation with iron and aluminium reagents to the proposed new crystallisation technology for simultaneous P-removal and P-recovery.


 

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