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Effect of small scale solids migration in filter cakes during filtration of wastewater solids suspensions

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Upward curved (concave) filtration plots of the inverse filtrate flux as a function of filtrate volume have been investigated using a laboratory-scale filtration device and different wastewater solids suspensions stored anaerobically in the laboratory. Using an empirical approach in which a polynomial expression of arbitrary order was applied for regression analysis on filtration data it was shown that a parabolic expression was able to fit adequately all concave filtration plots. Turbidity measurements on supernatant and filtrate evidenced that the concave behavior of the filtration plots could be explained by migration of small-scale solids into the filter cake pores (blinding). The coefficients of the derived parabolic equation characterized the resistance attributed to blinding, basic cake filtration, and the filter medium, respectively. Based on the coefficients of the derived parabolic equation, a physically comprehensible parameter for characterizing the influence of blinding on filtration was defined.
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Document Type: Research Article

Publication date: 1995-01-01

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  • Water Environment Research (WER) is published monthly, including an annual Literature Review. A subscription to WER includes access to the latest content back to 1992, as well as access to fast track articles. An individual subscription is valid for 12 months from month of purchase.

    Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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