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Recovery of Phosphorus from Sewage Sludge Ashes with the RecoPhos Process

Recycling of phosphorus from sewage sludge provides a sustainable solution for the production of this fi nite resource essential for human nutrition. The RecoPhos process uses the innovative InduCarb-reactor design in which the ashes from sludge incineration plants are molten and trickle down an inductively heated packed bed of carbon. The reactions taking place inside the reactor for production of high quality phosphorus are based on the same principle as the well known Woehler process. In the RecoPhos research project (receiving funding from the European Union) the process is developed using modelling and lab scale experiments.

Phosphorus is an essential element for all forms of life and its exploitable deposits are getting scarce quickly. This and also the fact that phosphate mining and refining has severe side effects on the environment, like enormous land use; and the production of vast amounts of dangerous wastes, will make it inevitable in the near future to recycle phosphorus from every suitable P-containing waste. Sewage sludge is considered to be one of the most important alternative phosphorussources, as in this sludge all of the phosphorus discharged by humans is concentrated and can, if properly collected and treated, be recycled completely. Its inorganic dry matter (= ash content) has a phosphate content of 30 up to 70 % of the content of phosphate concentrates produced from natural phosphate rocks. The principle of the RecoPhos process is the fractioned extraction of phosphorus and heavy metals from sewage sludge and its ash at high temperatures under reducing conditions. The RecoPhos process transforms a problematic waste into several streams of secondary raw materials, leaving behind a minimum of solid waste. The aim of the planned RecoPhos project is to develop a completely new P-recycling process, which can avoid several of the known chemical-technical problems that are still limiting the possible success of Phosphorus Recycling.

Copyright:	© Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben
Quelle:	Depotech 2014 (November 2014)
Seiten:	24
Preis:	€ 10,00
Autor:	Dipl.-Ing. Andreas Schönberg Dr. mont. Dipl.-Ing. Hannes Kern Univ. Prof. Dipl.-Ing. Dr.techn. Harald Raupenstrauch
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