Ternary expression stage in biological sludge dewatering

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)905-914
Journal / PublicationWater Research
Volume32
Issue number3
Publication statusPublished - 1 Mar 1998
Externally publishedYes

Abstract

The expression characteristics of original and freeze/thaw conditioned waste activated sludges were experimentally evaluated. Results in this study indicate that the first two stages of expression (primary and secondary consolidation) are similar to those of a particulate system, on which the model analysis by Shirato et al. (1974) is applicable. In the final phase of the expression of biological sludge, however, an unexpected constant-rate consolidation period, termed herein the ternary consolidation period, is observed. A modified combined Terzaghi-Voigt rheological model is proposed to describe the relation between void ratio and compressive pressure of the sludge cake. Whereas the resulting governing equation is solved analytically and the model parameters are found by regression analysis. The ternary consolidation is speculated to arise from the erosion of strongly bound moisture from the biological particles.

Research Area(s)

  • Activated sludges, Expression, Freeze/thaw treatment, Modeling, Ternary consolidation

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.

Citation Format(s)

Ternary expression stage in biological sludge dewatering. / Chang, I. L.; Lee, D. J.
In: Water Research, Vol. 32, No. 3, 01.03.1998, p. 905-914.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review