(613f) Fate of Inorganics during Hydrothermal Carbonization of High Ash Fraction of Air Classified Biomass
The goal of this study was to reduce the AAEMs+P from the high ash fraction of air classified forest residues (AC-FR) using Hydrothermal Carbonization (HTC) because HTC has been proven effective for leaching monovalent and divalent cations as well as halides. Therefore, high ash fractions of AC-FR was subjected to HTC at temperatures of 180-260 °C. Solid hydrochars were characterized with induced coupled plasma (ICP), ultra violet visible spectroscopy (UVVIS), ultimate analysis, proximate analysis, and scanning electron microscopy-electron dispersive X-ray spectroscopy (SEM-EDS). Meanwhile, HTC process liquids were characterized ICP and UVVIS in order to perform mass balance of AAEMs+P. The results showed that AAEMs have leached from solid to liquid and a higher HTC temperature increases the leaching. It was also observed that higher HTC temperature reduces elemental carbon and oxygen from solid. Therefore, the overall ash content of hydrochar remains similar at higher HTC temperatures, despite of an overall reduction of AAEMs from solid.