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    Rheological Characteristics of Municipal Thickened Excess Activated Sludge (TEAS): Impacts of pH, Temperature, Solid Concentration and Polymer Dose

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    Access Status
    Open access
    Authors
    Hong, Eugene
    Yeneneh, Anteneh
    Kayaalp, A.
    Sen, Tushar
    Ang, Ha
    Kayaalp, M.
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Hong, E. and Yeneneh, A. and Kayaalp, A. and Sen, T. and Ang, H. and Kayaalp, M. 2016. Rheological characteristics of municipal thickened excess activated sludge (TEAS): impacts of pH, temperature, solid concentration and polymer dose. Research on Chemical Intermediates. 42 (8): pp. 6567-6585.
    Source Title
    Research on Chemical Intermediates
    DOI
    10.1007/s11164-016-2482-2
    School
    Department of Chemical Engineering
    Remarks

    The final publication is available at Springer via http://doi.org/10.1007/s11164-016-2482-2

    URI
    http://hdl.handle.net/20.500.11937/44017
    Collection
    • Curtin Research Publications
    Abstract

    Rheological characterization of sludge is known to be an essential tool to optimize flow, mixing and other process parameters in wastewater treatment plants. This study deals with the characterization of thickened excess activated sludge in comparison to raw primary sludge and excess activated sludge. The effects of key parameters (total solid concentration, temperature, and pH) on the rheology and flow behavior of thickened excess activated sludge were studied. The rheological investigations were carried out for total solid concentration range of 0.9–3.7 %w/w, temperature range of 23–55 °C, and pH range of 3.6–10.0. Different rheological model equations were fitted to the experimental data. The model equations with better fitting were used to calculate the yield stress, apparent, zero-rate, infinite-rate viscosities, flow consistency index, and flow index. The decrease in concentration from 3.7 to 3.1 %w/w resulted in a drastic reduction of yield stress from 27.6 to 11.0 Pa, while a further reduction of yield stress to 1.3 Pa was observed as solid concentration was reduced to 1.3 %w/w. The viscosity at higher shear rate (>600 s−1) decreased from 0.05 Pa·s down to 0.008 Pa·s when the total solid concentration was reduced from 3.7 to 0.9 %. Yield stress decreased from 20.1 Pa down to 8.3 Pa for the Bingham plastic model when the temperature was raised from 25 to 55 °C. Activation energy and viscosity also showed decreasing trends with increasing temperature. Yield stress of thickened excess activated sludge increased from a value of 6.0 Pa to 8.3 Pa when the pH was increased from 3.6 to 10.0. The effect of polymer dose on the rheological behavior of the thickening of excess activated sludge was also investigated, and the optimum polymer dosage for enhanced thickener performance was determined to be 1.3 kg/ton DS.

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