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Measurement of bound water content in sludge: The use of differential scanning calorimetry (DSC)
Author(s) -
Lee DuuJong,
Lee Sun F.
Publication year - 1995
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.280620408
Subject(s) - bound water , differential scanning calorimetry , water content , freezing point depression , chemistry , materials science , analytical chemistry (journal) , thermodynamics , freezing point , molecule , chromatography , geotechnical engineering , organic chemistry , physics , engineering
The bound water content of original and frozen activated sludge and an inorganic sludge were measured via differential scanning calorimetry (DSC) and drying tests. Original sludge contained a significant level of bound water which was reduced by about 50% after freeze/thaw treatment. A simple thermodynamic interpretation showed that liquid–solid binding strength played an important role in depression of the freezing point of bound water in a sludge. The choice of a threshold temperature in a DSC test was equivalent to definition of a threshold binding strength dividing bound/non‐bound water content. The possible close relationship between the bound water content measured via DSC and the drying test is discussed. The importance for sample uniformity was also examined.