Abstract
In this work, effect of process parameters on hydrothermal gasification (HTG) of biogas digestate are
thermodynamically investigated using a Matlab-based code, which is capable of modelling the effects of the
feedstock’s inorganic contents and elements. The effects of temperature (400-600 oC), pressure (250-300 bar),
and feed concentration (10-40 wt%) towards the producer gas yield and composition are evaluated while
considering the influence of inorganic components in the feedstock. The result shows that temperature and feed
concentration play significant roles in determining producer gas composition and yield, whereas pressure only
has little influence. Hydrogen production is favored by higher temperature, lower pressure, and lower feed
concentration. It was also observed that the presence of inorganic components in the feedstock reduces the
production of CO2, while H2 and CH4 is increased. The result of this study is essential in the future development
of biogas digestate HTG.
thermodynamically investigated using a Matlab-based code, which is capable of modelling the effects of the
feedstock’s inorganic contents and elements. The effects of temperature (400-600 oC), pressure (250-300 bar),
and feed concentration (10-40 wt%) towards the producer gas yield and composition are evaluated while
considering the influence of inorganic components in the feedstock. The result shows that temperature and feed
concentration play significant roles in determining producer gas composition and yield, whereas pressure only
has little influence. Hydrogen production is favored by higher temperature, lower pressure, and lower feed
concentration. It was also observed that the presence of inorganic components in the feedstock reduces the
production of CO2, while H2 and CH4 is increased. The result of this study is essential in the future development
of biogas digestate HTG.