Sewage sludge as a fuel and raw material for phosphorus recovery: Combined process of gasification and P extraction

Waste Management
Katarzyna GorazdaZbigniew Wzorek

Abstract

Increasing problems associated with sewage sludge disposal are observed nowadays. As the thermal conversion of sewage sludge (combustion, co-combustion, gasification and pyrolysis) appears to be the most promising alternative for its management, the solid residues left after gasification were examined. The present study evaluates the potential of this waste as an alternative phosphorus source in the context of phosphorus recovery. The obtained solid gasification residues were characterised (chemical and phase composition, thermal properties, surface properties and technological parameters used for phosphorus raw materials) and compared to commercial phosphate raw materials. It was revealed that gasification residue is a valuable source of phosphorus and microelements, comparable to sewage sludge ash (SSA) considered nowadays as secondary phosphorus raw materials. Chemical properties as well as technological parameters characteristic for natural phosphate ores are different. Solid gasification residue was leached with mineral acids (phosphoric and nitric) according to the patented method of phosphorus recovery - PolFerAsh, developed by Cracow University of Technology. It was revealed that phosphorus can be selectively leached fr...Continue Reading

Citations

Jul 25, 2019·Environmental Science and Pollution Research International·Sebastian Werle, Szymon Sobek
Jun 23, 2021·Environmental Science and Pollution Research International·Yunfeng XuGuangren Qian

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