Journal article

Publication year: 2017

Pages: 194-203

Journal: Waste Management

Volume number: 62

ISSN: 0956-053X

DOI Link: https://doi.org/10.1016/j.wasman.2017.02.019

Publisher: Elsevier

Abstract: 
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.

Harvard Citation style: Steckenmesser, D., Vogel, C., Adam, C. and Steffens, D. (2017) Effect of various types of thermochemical processing of sewage sludges on phosphorus speciation, solubility, and fertilization performance, Waste Management, 62, pp. 194-203. https://doi.org/10.1016/j.wasman.2017.02.019

APA Citation style: Steckenmesser, D., Vogel, C., Adam, C., & Steffens, D. (2017). Effect of various types of thermochemical processing of sewage sludges on phosphorus speciation, solubility, and fertilization performance. Waste Management. 62, 194-203. https://doi.org/10.1016/j.wasman.2017.02.019