DOI number:10.1016/j.supflu.2016.08.018
Journal:The Journal of Supercritical Fluids
Abstract:Humic acid is a model compound of sewage sludge that occurs as a result of decomposing organic matter in wastewater. In this study, humic acid gasification was performed at variable subcritical and supercritical water temperatures (325–600 °C), feed concentration (10–25 wt%) and reaction time (30–90 min). High H2 yield of 0.79 mol/kg was obtained at 600 °C, 15 wt% humic acid and 75 min without any catalyst. Catalysts such as K2CO3, Ni/Al2O3–SiO2, FeCl3 and ZnCl2 were examined to enhance H2 production and humic acid degradation. While H2 yield increased exponentially with rising FeCl3 loading, Ni/Al2O3–SiO2 and K2CO3 reduced H2 yield due to bimolecular condensation and catalyst deactivation. Maximum yield of H2 (4.09 mol/kg) and total gases (6.20 mol/kg) were obtained with 15 wt% humic acid and 15 wt% FeCl3 at 600 °C and 75 min. Elevated temperatures and high FeCl3loading promoted the degradation of humic acid with higher gas yields and fragmented surface morphology in char residues.
Volume:119
Issue:0
Page Number:130-138
Translation or Not:no
Date of Publication:2017-01-01
Included Journals:SCI
Links to published journals:http://www.sciencedirect.com/science/article/pii/S0896844616302741