Rheological modelling of fresh human faeces

• Published in: Journal of water, sanitation, and hygiene for development Vol. 4; no. 3; pp. 484 - 489
• Main Authors: WOOLLEY, S. M, BUCKLEY, C. A, POCOCK, J, FOUTCH, G. L
• Format: Journal Article
• Language: English
• Published: London International Water Association 01.01.2014; IWA Publishing
• Subjects: Applied sciences; Computational fluid dynamics; Computer applications; Constants; Data processing; Design standards; Dynamics; Exact sciences and technology; Faeces; Feces; Fluid dynamics; Fluids; Human performance; Hydrodynamics; Literature reviews; Materials selection; Mechanical stimuli; Modelling; Moisture content; Other wastewaters; Pollution; Properties; Rheological properties; Rheology; Shear stress; Viscosity; Wastewaters; Water treatment and pollution; Blackwater; Rheology; Waste treatment; Mechanical properties; Shear strength; Sustainable development; Herschel-Bulkley; Waste management; Domestic waste water; Upgrading; Waste reuse; Water content; human stool; Feces; Resource management; Power law; moisture content
• ISSN: 2043-9083; 2408-9362
• DOI: 10.2166/washdev.2014.088

An analysis of viscosity data from sets of raw data on the shear rheological properties of fresh human faeces was performed to generate model constants that can be used for the design of faecal treatment processes. The models selected are standard choices in computational fluid dynamics software for shear-thinning fluids. Initial screening for model selection was based on a literature review of similarly viscous materials. Results showed reasonable agreement with Power Law (PL). PL model parameters were proposed for fresh human faeces and correlated against sample properties. A PL model for shear stress as a function of moisture content was proposed.