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• W2182049737 abstract "The Waste Treatment and Immobilization Plant (WTP) facilities will generate process streams, which are characterized with relatively high concentrations of solids and non-Newtonian rheology (generally described with a Bingham plastic model). The current flow sheet of the WTP includes the use of pulse jet mixers (PJMs) throughout the plant to provide adequate mixing of the process fluids. The main objective of the experimental program conducted at Florida International University was to investigate gas retention and release properties of selected non-Newtonian fluids relevant to waste streams of the Hanford Tank Waste Treatment, and Immobilization Plant. Bench scale experiments were carried out using mixtures of kaolin-bentonite which define a range in particle size distribution, morphology, zeta potential and yield stress. The experimental program used in-situ generated oxygen generated by decomposing hydrogen peroxide catalyzed by a mixture of ferrous iron and EDTA to provide data about the volumes of retained gas and the release rates from the gelled simulant. A six foot column with diameter of 6 inches was connected to a mass spectrometer to provide high resolution time series of gas release. The retention potential of each simulant and the signature of the released gas (such as total volume, shape, and peak intensity) were determined. Studies conducted to date at SRS (Savannah River Site) and PNNL (Pacific Northwest National Laboratory) have addressed mostly steady state behavior of gas hold up in completely mixed fluids while transient behavior, which is significant for loss of power events, has not been investigated in a systematic manner. Moreover, data reported by Stewart et al [10] reported results from simulants with yield stress of 3, 13 and 30 Pa, however no systematic studies were conducted in the lower range of 0-10 Pa and only one point existed in this range (3 Pa) which does not provide sufficient basis for extrapolation in the lower range Therefore, this experimental program extends experimental studies previously conducted at SRS and PNNL by addressing the transient behavior of gas release, retention and release patterns for mixtures with yield stress lower than 5 Pa. The experimental data were analyzed to provide information about the equilibrium mass of oxygen contained in the gelled simulant and the initial rates of release of retained gas. Additional experiments are planned with mixtures that include antifoaming agents (AFA) and the data will be correlated with the physicochemical and colloidal properties of the simulants (particle size distribution, morphology, zeta potential, yield stress and Bingham consistency) to provide a better understanding of the governing factors for gas retention and release properties of fluids with yield stress parameters in the range of 0-10 Pa." @default.
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• W2182049737 date "2011-01-01" @default.
• W2182049737 modified "2023-09-24" @default.
• W2182049737 title "Gas Retention and Release Experiments with Low Yield Stress Fluids - 11289" @default.
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