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    Settling characteristics of fractal aggregates

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    Author
    Simmons, Shawn Emerson
    Date
    1999
    Advisor
    Wiesner, Mark R.
    Degree
    Master of Science
    Abstract
    The settling velocity of aggregates found in engineered water and wastewater treatment facilities are usually assumed to follow Stokes' law. These particles, however, are typically porous and may be fractal in nature. As a result, they have very different sedimentation characteristics. This study focuses on the comparison of several techniques used to characterize the settling properties of fractal aggregates. Aggregates made of latex particles destabilized using calcium nitrate were formed in the laboratory. Settling velocity and size were then determined for each floc using latex particles ranging 0.03 mum, 0.05 mum, and 2.65 mum in diameter. Light scattering techniques were used to calculate the fractal dimension of the aggregates. Fractal dimension ranged from 1.6 to 2.3 in the experiments. A settling column was constructed to analyze actual settling velocities of flocs. Observed settling velocities of these flocs were consistently higher than those predicted using Stokes' law (which assumes an impermeable sphere).
    Keyword
    Environmental engineering
    Citation
    Simmons, Shawn Emerson. "Settling characteristics of fractal aggregates." (1999) Master’s Thesis, Rice University. https://hdl.handle.net/1911/17379.
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    • Rice University Electronic Theses and Dissertations [13409]

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    Managed by the Digital Scholarship Services at Fondren Library, Rice University
    Physical Address: 6100 Main Street, Houston, Texas 77005
    Mailing Address: MS-44, P.O.BOX 1892, Houston, Texas 77251-1892
    Site Map