EUBCE 2024 - Carolina OCHOA MARTINEZ - Influence of Temperature and Time on Nutrients Transformation During Hydrothermal Treatment of Pig Manure

Influence of Temperature and Time on Nutrients Transformation During Hydrothermal Treatment of Pig Manure

Short Introductive summary

This study investigates the nutrients transformation in the process streams obtained from Hydrothermal Treatment (HTT) of PM. A series of 10 experiments were performed according to a design of experiments using a Central Composite Design (CCD) were developed in a batch reactor in steel of 0.2 L volume to evaluate the relative significance and interactions between reaction temperature (120 - 180 °C) and time (30 - 80 min) on P recovery yield and P speciation in solid and liquid product. The aim of this study was to concentrate the nutrient fraction in the solid phase, enabling its valorization as an alternative nutrient source. The results showed that temperature was the most influential parameter controlling P transformation and migration during HTT of PM. Total P increased from 14.5 mg P/g in raw PM to 15.29- 26.29 mg/g in solid products. Most of the initial P was transformed into AIP, as a stable form of P. P fractions were influenced by metal’s interaction during HTT. Overall, the results of this study provide information on the transformation, migration, and speciation of PM manure during hydrothermal treatment and the role of temperature and time.

C. Ochoa Martinez, Aix Marseiille University, Marseille, FRANCE
C. Barca, Aix Marseiille University, Marseille, FRANCE
O. Boutin, Aix Marseiille University, Marseille, FRANCE
J.H Ferrasse, Aix Marseiille University, Marseille, FRANCE