Sopin Paethong creator Takizawa, S. Chairperson Visvanathan, C. Examination Committee Samorn Muttamara Examination Committee Metropolitan Waterworks Authority (MWA) Scholarship donor text th Bangkok Asian Institute of Technology 1998 monographic eng 93 leaves This research study emphasized mechanical dewatering characteristics and attempted to investigate the use of filter press in Bangken Water Treatment Plant because it was anticipated that in the not-too-distant future the filter press would be considered. Although previous systems are generally not economically feasible for most treatment plants, improvements in technology and adjustments in materials and system costs may make them more attractive in the future. The specific resistance of the conditioned sludge and CST are determined. They are found that the addition of optimum dosage of chemicals improve the filterability of sludge to a high degree, in which the specific resistance of the sludge is decrease from an average of 6.53E+ 11 m/kg to7.48E+10 m/kg. The figure revealed the optimum dosage of Ze Tag 63, anionic polymer to be 0.08% DS sludge. A comparison between combination of chemical conditioners to apply in filter pressing operation indicate that by using anionic polymer with lime in place of cationic would fall in CST value of 10.7 s, however, the cost of lime and anionic polymer might be higher than that of cationic polymer for the same degree of conditioning. A research study submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development Thesis (M.Sc.) - Asian Institute of Technology, 1998 Water Purification Filtration Sewage sludge Drying Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B12746 http://203.159.5.9/ait-thesis/detail.php?q=B12746 011298 20260817162825.0