Dewatering of agar-agar gels containing sucrose by mechanical compression
2001
Nakakura, H. (Yamaguchi Univ., Ube (Japan). Faculty of Engineering) | Nakatake, T. | Sambuichi, M. | Osasa, K.
The dewatering process of agar-agar gels containing sucrose was experimentally investigated by using a compression-permeability cell. The gels used in the present study were agar-agar bulk gels prepared from agar-agar sols by adding powdered sucrose. The bound water in the gel matrix was quantitatively evaluated by measuring the electrical conductivity of the agar-agar gels containing sucrose. The maximum bound water contents was obtained at the sucrose concentration of c subs = 20wt. %, where the bound water content corresponded to 2.0-fold mass ratio of the dry gel solid. The dewatering process of agar-agar gels containing sucrose by mechanical compression could be reasonably analysed as a cake filtration period followed by a consolidation period. Both average specific filtration resistance a subav and modified consolidation coefficient C sube were well correlated with applied pressure p and viscosity of sucrose solution micro. It is essential to take into account the bound water content in the analysis of the expression process for agar-agar gels containing sucrose.
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