期刊
WASTE MANAGEMENT
卷 62, 期 -, 页码 194-203出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2017.02.019
关键词
P-recovery; Low-temperature-conversion; Thermochemical treatment; P-fractionation; P-plant-availability; Sewage sludge
资金
- German Federal Office for Agriculture and Food on basis of a resolution of the German Bundestag in the context of the Federal Program on Organic Farming (Bunde-sprogramm Okologischer Landbau und andere Formen nachhaltiger Landwirtschaft, BOLN) [2811NA022/2811NA023]
Sewage sludge has one of the highest phosphorus (P) recovery potentials of all waste materials. Therefore, P-recycling from sewage sludge could contribute to closing the P-cycle. Recently, various thermal processes for P-recovery have been developed, but there is still a demand for information on the effect of different process parameters (e.g. additives and temperature) on P-speciation and especially on the fertilization performance. In the present study, two common methods (low-temperature conversion at 400-500 degrees C and thermochemical treatment at 950 degrees C) were investigated and combined to produce highly bioavailable P-fertilizers from two different types of sewage sludge based on chemical phosphorus precipitation (Chem-P) and enhanced biological phosphorus removal (Bio-P). The results of P-fractionation, X-ray diffraction analysis, and pot experiments with maize showed that Bio-P sludges attain high P-plant-availability after treatment at low temperatures (400 degrees C). In contrast, Chem-P sludges can adequately be treated at higher temperatures under reductive conditions with sodium additives to form highly bioavailable calcium-sodium-phosphate. Additionally, also highly heavy-metal contaminated sludges can be thermochemically treated at high temperatures to achieve the legal requirements for fertilizers. (C) 2017 Elsevier Ltd. All rights reserved.
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