Plant Soil Environ., 2014, 60(12):555-561 | DOI: 10.17221/548/2014-PSE

Phosphate fertilizer value of heat treated sewage sludge ashOriginal Paper

M. Severin1, J. Breuer2, M. Rex3, J. Stemann4, Ch. Adam4, H. Van den Weghe1, M. Kücke5
1 Department of Animal Sciences, Faculty of Agricultural Sciences, Georg-August-University of Göttingen, Göttingen, Germany
2 Reterra Service GmbH, Erftstadt, Germany
3 Assosciation Slag, Duisburg, Germany
4 Federal Institute for Materials Research and Testing, Division 4.4. Thermochemical Residues, Treatment and Resource Recovery, Berlin, Germany
5 Institute of Crop and Soil Science, Julius Kühn-Institute, Braunschweig, Germany

This study focuses on the question whether heat treated sewage sludge ashes are more favourable as fertilizers than untreated sewage sludge ashes (USSA) and whether their fertilization effects are comparable with commercial triple superphosphate (TSP). In a pot experiment, maize was fertilized either with one of three heat treated and Na-, Ca- and Si-compounds amended sewage sludge ashes (two glown phosphates, steel mill slag + sewage sludge ash) or USSA or TSP as control. Fertilization with USSA did not increase the biomass yield and the P uptake of maize in comparison to the P0 treatment (7.25 resp. 8.35 g dry matter/pot). Fertilization with heat treated sewage sludge ashes and TSP resulted in significantly higher yields and plant P uptakes which are on average eight times higher than treatment with USSA and P0 control. Biomass yields and P uptake of maize after fertilization with heat treated sewage sludge ashes are not significantly different from those after TSP fertilization. The main P compound in USSA is Ca3(PO4)2. By heat treatment and amendment with different sodium, calcium, sulphur and silicon containing additives or steel mill converter slag, Ca3(PO4)2 is converted to Ca- and Na-silico-phosphates, which have a higher water solubility than Ca3(PO4)2. This increased solubility is responsible for the high plant availability of this phosphates.

Keywords: P recycling; sustainability; P solubility

Published: December 31, 2014  Show citation

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Severin M, Breuer J, Rex M, Stemann J, Adam C, Van den Weghe H, Kücke M. Phosphate fertilizer value of heat treated sewage sludge ash. Plant Soil Environ. 2014;60(12):555-561. doi: 10.17221/548/2014-PSE.
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