RecoPhos: Full-scale fertilizer production from sewage sludge ash |
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| Authors: | Harald Weigand Martin Bertau Wilfried Hübner Fred Bohndick Axel Bruckert |
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| Institution: | 1. Technische Hochschule Mittelhessen - University of Applied Sciences, ZEuUS, 35390 Gießen, Germany;2. Freiberg University of Mining and Technology, Institute of Chemical Technology, 09596 Freiberg, Germany;3. Humboldt Universität zu Berlin, Faculty for Agriculture and Horticulture,10099 Berlin, Germany;4. RecoPhos Consult Gmbh, 39638 Jävenitz, Germany;5. RecoPhos-AVB Tangermünde GmbH, 39590 Tangermünde, Germany |
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| Abstract: | The substitution potential of sewage sludge for German primary phosphate imports has been estimated as 40%. Yet, a marketable option for the full scale recovery has been lacking. This study focuses on a full-scale process for the manufacture of a P-fertilizer from sewage sludge ash (SSA) adapted from the production of Triple Superphosphate. Given (i) conformity of the input with phosphate ores mined from sedimentary deposits, (ii) comparability of the product with a commercially available P-fertilizer regarding contaminant levels, P-fractionation and yield effects, and (iii) compliance of the output with the German Fertilizer Ordinance the RecoPhos P 38 fertilizer was discharged from the waste legislation regime. The fertilizer is currently being produced at a rate of 1000 tonnes per month and sold at a competitive price. |
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