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Title: Comparative evaluation of conventional and microwave hydrothermal carbonization of human biowaste for value recovery
Authors: Afolabi, Oluwasola O.D.
Sohail (Khan), M.
Keywords: Bioenergy
Conventional heating
Hydrothermal carbonization
Sewage sludge
Issue Date: 2017
Publisher: © IWA Publishing
Citation: AFOLABI, O.O.D. and SOHAIL (KHAN), M., 2017. Comparative evaluation of conventional and microwave hydrothermal carbonization of human biowaste for value recovery. Water Science and Technology, 75(12), pp.2852-2863.
Abstract: This paper compares conventional and microwave hydrothermal carbonization (HTC) of human biowaste (HBW) at 160 WC, 180 WC and 200 WC as a potential technology to recover valuable carbonaceous solid fuel char and organic-rich liquor. Also discussed are the influence of HTC heating methods and temperature on HBW processing conversion into solid fuel char, i.e. yield and post-HTC management, i.e. dewaterability rates, particle size distribution and the carbon and energy properties of solid fuel char. While HTC temperatures influenced all parameters investigated, especially yield and properties of end products recovered, heating source effects were noticeable on dewatering rates, char particle sizes and HBW processing/end product recovery rate and, by extension, energy consumed. The microwave process was found to be more efficient for dewatering processed HBW and for char recovery, consuming half the energy used by the conventional HTC method despite the similarity in yields, carbon and energy properties of the recovered char. However, both processes reliably overcame the heterogeneity of HBW, converting them into non-foul end products, which were easily dewatered at <3 seconds/g total solids (TS) (c.f. 50.3 seconds/g TS for a raw sample) to recover energy-densified chars of ≈17 MJ/kg calorific value and up to 1.4 g/l of ammonia concentration in recovered liquor.
Description: This paper was accepted for publication in the journal Water Science and Technology and the definitive published version is available at http://dx.doi.org/10.2166/wst.2017.164
Sponsor: The authors would like to thank The Bill & Melinda Gates Foundations for funding Loughborough University, UK, on the ‘Reinvent the Toilet Challenge’ project.
Version: Accepted for publication
DOI: 10.2166/wst.2017.164
URI: https://dspace.lboro.ac.uk/2134/24660
Publisher Link: http://dx.doi.org/10.2166/wst.2017.164
ISSN: 0273-1223
Appears in Collections:Published Articles (Architecture, Building and Civil Engineering)

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