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Hydrothermal carbonisation of sewage sludge: effect of process conditions on product characteristics and methane production

journal contribution
posted on 04.06.2015, 13:57 by Eric Danso-Boateng, Gilbert Shama, Andrew Wheatley, Simon Martin, Richard Holdich
Hydrothermal carbonisation of primary sewage sludge was carried out using a batch reactor. The effect of temperature and reaction time on the characteristics of solid (hydrochar), liquid and gas products, and the conditions leading to optimal hydrochar characteristics were investigated. The amount of carbon retained in hydrochars decreased as temperature and time increased with carbon retentions of 64–77% at 140 and 160 °C, and 50–62% at 180 and 200 °C. Increasing temperature and treatment time increased the energy content of the hydrochar from 17 to 19 MJ/kg but reduced its energy yield from 88% to 68%. Maillard reaction products were identified in the liquid fractions following carbonisations at 180 and 200 °C. Theoretical estimates of the methane yields resulting from the anaerobic digestion of the liquid by-products are also presented and optimal reaction conditions to maximise these identified.

Funding

This research was part of Gates Foundation: “Reinventing the Toilet Challenge”.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Materials

Published in

BIORESOURCE TECHNOLOGY

Volume

177

Pages

318 - 327 (10)

Citation

DANSO-BOATENG, E. ... et al, 2015. Hydrothermal carbonisation of sewage sludge: effect of process conditions on product characteristics and methane production. Bioresource Technology, 177, pp. 318 - 327.

Publisher

© Elsevier Ltd.

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2015

Notes

This article is closed access.

ISSN

0960-8524

Language

en

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