Lecture 10

G biosolids in sludge thickening or a slurry eg

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Unformatted text preview: ension (e.g., biosolids in sludge thickening) or a slurry (e.g., diatomaceous earth). PIERO M. ARMENANTE NJIT Types of Filtration Operations • Cross-flow filtration, in which a septum is responsible for the filtering action (e.g., microscreens); • Depth (or deep-bed) filtration, in which the particles are removed throughout the filter bed or in a significant portion of it (e.g., sand filters); • Cake filtration, in which the particles are removed on the surface of a cake formed by the solids accumulating on a septum (e.g., rotary vacuum filters). PIERO M. ARMENANTE NJIT Classification of Filtration Systems Filtration systems can be classified according to: • type of operation (batch vs. continuous) • direction of fluid flow with respect of filter medium (perpendicular vs. parallel) • type of filter medium (e.g., screen, deep bed, cake) • location within the filter medium where particle deposition occurs • flow rate or pressure control during filtration (e.g., constant pressure drop) PIERO M. ARMENANTE NJIT Filtration Operations • Batch or semicontinuous filtration − Periodical removal of solids is required (e.g., through backwashing) − Pressure across and/or flow rate through filter change with time • Continuous filtration − Solids are continuously removed − Pressure across and/or flow rate through filter are r...
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