Brine Drying in Droplets and Thin Films



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47th International Conference on Environmental Systems


Research has been conducted on drying of small urine brine samples in form of droplets and thin films. Sessile droplets of brine were dried in an oven on Teflon supports (Teflon film or plate). Thin films of brine were dried using glass Petri dishes in an oven. Small samples such as droplets or thin films have high ratio of surface area to sample volume - the phenomena at the sample surface are important to sample drying. Elevated solutes concentration at the surface leads to formation of solid precipitates and if they form crust at the surface that may hinder the drying process. The brine can also have an addition of inorganic acid and as water is removed, the acid becomes more concentrated and its viscosity increases affecting water diffusion coefficient, thus decreasing rate of water removal. Therefore, the brine droplet or film drying times may be longer than for water or salt solutions. Since urine composition is very complex, molecular and ionic interactions during brine dehydration under elevated temperature may take place affecting the drying process. Urine composition may also vary due to health conditions of the subjects. The results of analytical work were normalized to ratios of quantities of ions as well as urea molecule to compare the analytical results. The samples stickiness was investigated and it was found to be related to the mass decrease during drying. Issues of dehydration rate in time, urea decomposition and formation of solid deposits were addressed. This paper may provide useful information for other processes with thermal treatment of urine and urine brines as well as other complex fluids and their brines.


Richard Wisniewski, NASA Kennedy Space Center (KSC), USA
ICES501: Life Support Systems Engineering and Analysis
The 47th International Conference on Environmental Systems was held in South Carolina, USA on 16 July 2017 through 20 July 2017


Brine, Processing, Drying, Urine