Microbial evaluation of the viscous heater for commercial applications in faecal sludge treatment
conference contributionposted on 2018-11-13, 09:12 authored by Daniela Peguero, Gary Foutch, J. Smay, Tapuwa M. Sahondo, Lindelani P. Xaba, Tom P. Hayangah, Rebecca Sindall, Chris Buckley, Heather N. Bischel
Risk of infection from human pathogens by contact with untreated faecal sludge (FS) poses a threat to worker health. The aim of this study was to assess the commercial potential of a 1000 L h-1 viscous heater (VH) to minimise this risk as a component of a black soldier fly larvae (BSFL) production pipeline. Changes in source material properties during sludge processing, temperature stability and microbial treatment efficacy were evaluated. Inactivation of heterotrophic bacteria in FS treated in the VH was measured at 60 ℃ and 80 ℃. Approximately 1‑ to 3-log inactivation was observed, independent of residence time. Maintaining temperature stability proved difficult with variable sludge viscosity and manual control of flow rate and engine power. Adding operational controls based on effluent temperature would compensate for variable sludge properties. Preparing FS for treatment in the VH proved challenging due to the small particle size required and the large quantity of detritus present.
The authors would like to extend thanks to The Bill & Melinda Gates Foundation for funding this work.
- Architecture, Building and Civil Engineering
- Water, Engineering and Development Centre (WEDC)
Published inTransformation towards sustainable and resilient WASH services: Proceedings of the 41st WEDC International Conference
Pages? - ? (6)
CitationPEGUERO, D. ... et al, 2018. Microbial evaluation of the viscous heater for commercial applications in faecal sludge treatment. IN: Shaw, R.J. (ed). Transformation towards sustainable and resilient WASH services: Proceedings of the 41st WEDC International Conference, Nakuru, Kenya, 9-13 July 2018, Paper 3016, 6 pp.
Publisher© WEDC, Loughborough University
- VoR (Version of Record)
Publisher statementThis 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/
NotesThis is a conference paper.