Title:
Influence of Different Sequences of Washing and Thermochemical Pretreatment on Wood Biomass-derived Fuel for Hydrogen Production
Author(s):
Mulaudzi, L., Iwarere, S.A., Daramola, M.O.
Document(s):
Paper
Poster
Abstract:
In this work, preliminary investigation of washing pretreatment for ash reduction of wood sawdust was conducted using the aqueous phase from hydrothermal carbonisation (HTC) of wood biomass and deionised water as washing agents. HTC was performed at 220 °C for 90 minutes with a solid-to-liquid (S:L) ratio of 1:10; washing was performed at 50 °C for 15, 30, 45, and 60 minutes, with a S:L ratio of 1:10 and an agitation rate of 200 rpm. The results showed no conclusive ash reduction pattern with varying washing time for either washing agent, although ash content of the wood was lowered by washing. Washing had minimal effect on the proximate and ultimate analyses, and higher heating value (HHV) of the solid biomass product. Hydrochar from HTC had the lowest ash content (0.08%) compared to 0.45% of the raw biomass, and a 6.9% increase in HHV compared to raw biomass (19.36 MJ/kg). Washing with HTC aqueous fraction resulted in higher average mass yields (>95%) compared to washing with deionised water (>90%). Compared to the raw washing agents, the pH of effluents from HTC aqueous phase washing was higher and the pH of effluents from water washing was lower for all washing times investigated. Conductivity and total dissolved solids (TDS) of all washing effluents were higher than those of raw washing agents. The most significant changes in pH, conductivity, and TDS were observed with the shortest washing time of 15 minutes for both washing agents, when compared to the raw washing agents.
Keywords:
biomass, hydrogen, thermochemical conversion, pretreatment, hydrochar, washing effluent
Topic:
Biomass Conversion for Bioenergy
Subtopic:
Biomass pre-treatment and production of intermediates
Event:
32nd European Biomass Conference and Exhibition
Session:
4DV.6.4
Pages:
607 - 612
ISBN:
978-88-89407-24-0
Paper DOI:
10.5071/32ndEUBCE2024-4DV.6.4
Price:
FREE
