Dewatering of sludge of pulp and paper mill is investigated by the use of various organic and inorganic polymers in the present study. During the study it was found that cationic polymers areefficient in dewatering due to the negative nature of sludge. Nonionic and anionic polymers are relatively less effective. Inorganic polymers are effective in water release only at very high doses which is not cost efficient treatment. The best dewatering rate is achieved when cationic polymer (1kg/T) and Poly Aluminum Chloride (3kg/T) are used in combination whereas amongst cationic polymer, the best is C7115 followed by C5115 and C3115.

Keywords: Sludge; Cationic; Anionic; Dewatering; Polymer.