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Open AccessArticle

Measurement and Modelling of Moisture Sorption Isotherm and Heat of Sorption of Fresh Feces

1
Department of Civil Engineering, University of Victoria, Victoria, BC V8P 5C2, Canada
2
Centre for Affordable Water and Sanitation Technology, Calgary Alberta, AB T2H 2L8, Canada
*
Author to whom correspondence should be addressed.
Water 2020, 12(2), 323; https://doi.org/10.3390/w12020323
Received: 31 December 2019 / Revised: 18 January 2020 / Accepted: 19 January 2020 / Published: 22 January 2020
(This article belongs to the Section Wastewater Treatment and Reuse)
The drying (or dewatering) of fresh feces and fecal sludge is a productive step in the management of sanitation, waste treatment, and resource recovery services. An improved understanding of fresh feces and fecal sludge drying would contribute to the development and deployment of fecal sludge management services. However, there is a lack of available literature on the fundamental drying characteristics of fresh feces. In response to this gap, this work shares experimental results for equilibrium moisture content of fresh feces at different water activity levels (aw) and proposes the use of the Guggenheim, Anderson, and de Boer (GAB) model for predicting aw, calculating the heat of sorption, and estimating the corresponding energy requirements for drying of fresh feces. This is the first time this work has been done with fresh feces. The total heat of evaporation was significant up to a moisture content of about 0.2 kg water per kg dry solids. In addition to informing drying process design, the sorption isotherm can be used to predict microbial activity, which could improve the management of feces and fecal sludge from a public health perspective. These data in turn will be used to promote access to dignified, safe, and sustainable sanitation. View Full-Text
Keywords: desiccation; drying; fecal sludge; fresh feces; heat of sorption; moisture sorption isotherms; sanitation desiccation; drying; fecal sludge; fresh feces; heat of sorption; moisture sorption isotherms; sanitation
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Remington, C.; Bourgault, C.; Dorea, C.C. Measurement and Modelling of Moisture Sorption Isotherm and Heat of Sorption of Fresh Feces. Water 2020, 12, 323.

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