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Van den Weghe, H.
- Phosphate Fertilizer Value of Heat Treated Sewage Sludge Ash
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Authors
Affiliations
1 Department of Animal Sciences, Georg-August-University of Goettingen, Goettingen, DE
2 Reterra Service GmbH, Erftstadt, DE
3 Assosciation Slag, Duisburg, DE
4 Federal Institute for Materials Research and Testing, Division 4.4. Thermochemical Residues, Treatment and Resource Recovery, Berlin, DE
5 Department of Animal Sciences, Faculty of Agricultural Sciences, Georg-August-University of Goettingen, Goettingen, DE
6 Institute of Crop and Soil Science, Julius Kuehn-Institute, Braunschweig, DE
1 Department of Animal Sciences, Georg-August-University of Goettingen, Goettingen, DE
2 Reterra Service GmbH, Erftstadt, DE
3 Assosciation Slag, Duisburg, DE
4 Federal Institute for Materials Research and Testing, Division 4.4. Thermochemical Residues, Treatment and Resource Recovery, Berlin, DE
5 Department of Animal Sciences, Faculty of Agricultural Sciences, Georg-August-University of Goettingen, Goettingen, DE
6 Institute of Crop and Soil Science, Julius Kuehn-Institute, Braunschweig, DE
Source
Plant, Soil and Environment, Vol 60, No 12 (2014), Pagination: 555–561Abstract
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.Full Text
References
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