TY - JOUR A1 - Adam, Christian A1 - Peplinski, Burkhard A1 - Michaelis, Matthias A1 - Kley, Gerd A1 - Simon, Franz-Georg T1 - Thermochemical treatment of sewage sludge ashes for phosphorus recovery T2 - Waste management N2 - Phosphorus (P) is an essential element for all living organisms and cannot be replaced. Municipal sewage sludge is a carrier of phosphorus, but also contains organic pollutants and heavy metals. A two-step thermal treatment is suggested, including mono-incineration of sewage sludge and subsequent thermochemical treatment of the ashes. Organic pollutants are completely destroyed by mono-incineration. The resulting sewage sludge ashes contain P, but also heavy metals. P in the ashes exhibits low bioavailability, a disadvantage in farming. Therefore, in a second thermochemical step, P is transferred into mineral phases available for plants, and heavy metals are removed as well. The thermochemical treatment was investigated in a laboratory-scale rotary furnace by treating seven different sewage sludge ashes under systematic variation of operational parameters. Heavy metal removal and the increase of the P-bioavailability were the focus of the investigation. The present experimental study shows that these objectives have been achieved with the proposed process. The P-bioavailability was significantly increased due to the formation of new mineral phases such as chlorapatite, farringtonite and stanfieldite during thermochemical treatment. PB - Pergamon Press CY - New York, NY KW - P-recovery KW - Sewage sludge ash KW - Thermochemical treatment KW - Mineral phases KW - X-ray diffraction PY - 2009 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/18605 AN - OPUS4-18605 SN - 0956-053X VL - 29 IS - 3 SP - 1122 EP - 1128 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany