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EUBCE 2024 - Antonello TANGREDI - Phosphorus Conversion Pathways During Hydrothermal Liquefaction of Sewage Sludge Digestate

Phosphorus Conversion Pathways During Hydrothermal Liquefaction of Sewage Sludge Digestate

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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

Moderator portrait

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.

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Co-authors:

A. Tangredi, Aix Marseille Univ, CNRS, Centrale Marseille, M2P2, Marseille, FRANCE
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