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RecoPhos and Other Thermo-Chemical Processes for the Recovery of Phosphorus from Sewage Sludge

In modern sewage treatment plants (STP), about 90 % of the influent’s phosphorus can be re-moved via chemical and/or biological processes. This entire amount is found in the sludge and, after thermal treatment, also in the ashes. If sewage sludge is mono-incinerated, the resulting ashes represent the sludge matter with the highest possible P-concentration and the smallest mass to be treated respectively.

The RecoPhos process, which will be developed in an EU-funded international research project starting in March 2012 with 10 partners from research, small and middle size as well as multi-national industry, aims to recover phosphorus from sewage sludge and its ashes by a reaction chemically similar to the one used for the industrial production of white phospho-rus and the related thermal phosphoric acid (Woehler-process in an electric arc furnace). As core reactor, the RecoPhos process uses the novel InduCarb retort with its packed bed of large coke pellets heated by induction. During the process, the sludge ash is molten under reducing conditions, and is hence flowing in a thin film over the surface of the bed particles. On its way to the bottom, the phosphates and other components are reduced in the melt film (chemically reacting packed bed). The elemental phosphorus can evaporate from the film quickly without significantly reacting with other components present in the melt, which will mainly decrease the formation of Fe-P alloy, thus making the use of all kinds of sludge ash possible. The Re-coPhos process will produce thermal phosphoric acid, a Ca-Si cement binder and an alloy usa-ble in the steel industry. The energy-intensive RecoPhos process allows the use of alternative heat sources and of industrial wastes as chemical additives.

Copyright:	© Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben
Quelle:	Depotech 2012 (November 2012)
Seiten:	6
Preis:	€ 3,00
Autor:	Matthias Rapf Univ. Prof. Dipl.-Ing. Dr.techn. Harald Raupenstrauch
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