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|Title: ||Characterization of solid fuel chars recovered from microwave hydrothermal carbonization of human biowaste|
|Authors: ||Afolabi, Oluwasola O.D.|
Sohail (Khan), M.
Thomas, C.L. Paul
|Keywords: ||Faecal biomass|
|Issue Date: ||2017|
|Publisher: ||© Elsevier|
|Citation: ||AFOLABI, O.O.D., SOHAIL (KHAN), M. and THOMAS, C.L.P., 2017. Characterization of solid fuel chars recovered from microwave hydrothermal carbonization of human biowaste. Energy, 134, pp. 74–89.|
|Abstract: ||Microwave hydrothermal carbonization (M-HTC) is reported in this study as a viable sanitation
technology that can reliably overcome the heterogeneous nature of human faecal biowaste (HBW) and realize its intrinsic energy value. Solid chars produced from the M-HTC process at 180°C and 200°C were characterized to further the understanding of the conversion pathways and their
physicochemical, structural and energetic properties. The study revealed solid chars recovered were predominantly via a solid-solid conversion pathway. In terms of yield, more than 50% of solid chars (dry basis) can be recovered using 180°C as a benchmark. Additionally, the carbonized solid chars demonstrated enhanced carbon and energy properties following the M-HTC process:
when compared to unprocessed HBW, the carbon content in the solid chars increased by up to 52%, while the carbon densification factor was greater than 1 in all recovered chars. The calorific values of the chars increased by up to 41.5%, yielding heating values that averaged 25MJ.kg-1.
Thermogravimetric studies further revealed the solid fuel chars exhibited greater reactivity when compared with unprocessed HBW, due to improved porosity. This work strengthens the potential of the M-HTC sanitation technology for mitigating poor sanitation impacts while also recovering energy, which can complement domestic energy demands.|
|Description: ||This paper is in closed access until 4th June 2018.|
|Sponsor: ||The authors wish to thank the Bill & Melinda Gates Foundation for its funding to
Loughborough University, UK, on the ‘Reinvent the Toilet Challenge’ project.|
|Version: ||Accepted for publication|
|Publisher Link: ||https://doi.org/10.1016/j.energy.2017.06.010|
|Appears in Collections:||Closed Access (WEDC)|
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