Room: Poster Area
Date: Tuesday, 25 June 2024
Time: 17:30 - 18:30 CEST
Session code 6BV.10
Processes for bio-based chemicals and materials 2
Phosphorus Conversion Pathways During Hydrothermal Liquefaction of Sewage Sludge Digestate
Short Introductive summary
Sewage sludge represents a renewable source of nutrients such as nitrogen (N), potassium (K), and phosphorus (P). A critical analysis of 60 studies that have investigated P recovery from sewage sludge by hydrothermal processes has allowed to assess the effect of process parameters such as temperature, residence time and addition of additives on P conversion pathways. In this work, liquefaction of SS digestate is realized at different conditions to investigate the effect of different process parameters on P speciation and on the hydrothermal by-product’s characteristics. SS digestate was collected from a wastewater treatment plant from a large size community in South of France. Results show that temperature is the most influential parameter for P speciation and repartition: the increase in temperature appears to promote the increase in solid P recovery yield, the mineralization of organic P, and the conversion of non-apatitic P into apatitic P. These results will allow to identify the most suitable liquefaction process conditions to recover by-products rich in Ca phosphate that can be valorized as fertilizers.
Presenter
Antonello TANGREDI
Aix Marseille Universitè, FRANCE
Presenter's biography
I began my studies at the Polytechnic University of Turin in Chemical Engineering. In 2019, I joined a double degree program with École des Mines in France. In 2022, I began my PhD at M2P2 in Marseille, focusing on phosphorus recovery from sewage sludge digestate.
Biographies and Short introductive summaries are supplied directly by presenters and are published here unedited
Co-authors:
C. Barca, Aix Marseille Univ, CNRS, Centrale Marseille, M2P2, Marseille, FRANCE
J.-H. Ferrasse, Aix Marseille Univ, CNRS, Centrale Marseille, M2P2, Marseille, FRANCE
O. Boutin, Aix Marseille Univ, CNRS, Centrale Marseille, M2P2, Marseille, FRANCE
Session reference: 6BV.10.3