In a sludge dewatering process using polymer, controlling the polymer dosage is an important factor for upgrading performance and achieving a saving on costs. A new automatic polymer dosage control method has been developed by the authors, which features the use of a streaming current detector or a colloid titrator. These detectors detect the colloidal charge of the filtrate from sludge. The said method was used with actual dehydrators and the following advantages were confirmed.

  • (1) The said method is applicable for various types of dehydrators.

  • (2) The said method is effective even when there are changes in sludge characteristics.

  • (3) The said method is more economical than a conventional solids proportional control method in that less polymer is used.

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