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J4  2012, Vol. 46 Issue (3): 503-508    DOI: 10.3785/j.issn.1008-973X.2012.03.019
Bound water measurement methods and moisture distribution within sewage sludge
XIE Hao-hui, MA Hong-lei, CHI Yong, MA Zeng-yi
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
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Relationship between sludge moisture distribution and dewatering performance was studied to achieve effective dewatering of sewage sludge. Five measurement methods, including drying test, filtration test, expression test, sorption isotherms test and dilatometric test were applied to determine the bound water content within a typical sewage sludge sample. Features and applicable conditions of each method were obtained via analysis and comparison of their measurement data and theories. A sludge moisture distribution curve was constructed via analysis of the sludge moisture energy status in dilatometric method, which could be utilized to elucidate the sludge dewatering performance at different moisture contents. The experimental results indicate that the sludge bound water measurement results from five methods are different, and the maximum data of 628% mass fraction of the sludge bound water (bound water/ dry water) measurement result is obtained from filtration test whereas the minimum data of 34% from sorption isotherms test. The dilatometric method is preferable to the other methods due to its rapid operation and easy processing of raw experimental data. When the sludge moisture content (moisture/ dry solid) is larger than 183%, better dewatering performance can be achieved by slightly increasing of the strength of dewatering device.

Published: 01 March 2012
CLC:  X 705  
Cite this article:

XIE Hao-hui, MA Hong-lei, CHI Yong, MA Zeng-yi. Bound water measurement methods and moisture distribution within sewage sludge. J4, 2012, 46(3): 503-508.

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