In this paper, the findings to understand the effectiveness of laboratory geotube dewatering tests with additives for the dredged sludge taken from the base of the Golden Horn, Istanbul are presented. The dredge sludge used in this study has an extremely high water content. All the tests are performed by using two different cationic and anionic additives to enhance the dewatering, which provided the efficiency of the effect of types and amounts of selected additives on dewatering efficiency of Golden Horn dredged sludge. For this research, a dosage amount of 1.5 kg per ton is used as flocculants solution preparation with distilled water. Moreover, twelve homogeneous sludge-polymer admixtures are prepared by adding 0.1, 0.25, and 0.50% polymers (anionic and cationic) by weight of the dredged material for these tests. The results obtained from the tests on Golden Horn dredged sludge indicate that the use of flocculants increases the retention capacity of geotubes and more specifically that the chemical cationic polymers is more appropriate for Golden Horn dredged sludge rather than the anionic polymers.
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