| 摘要 |
of the Invention In a method of dewatering sludge wastes discharged from a factory such as pulp factory, sludge wastes are first dewatered by a preliminary dewatering device such as a pre-thickener of a rotary screen type, a sludge discharged from the preliminary dewatering device is then supplied to a main dewatering device such as a screw press. Waste liquids discharged from the preliminary and main dewatering devices are supplied to an agglutinating reaction tank together with a macromolecular agglutinating reagent and agglutinated substances in the agglutinating reaction tank are treated by the main dewatering device. The agglutinated substances formed on the bottom surface of the agglutinating reaction tank may be treated by a different main dewatering device than said main dewatering device. A necessary amount of the macromolecular agglutinating reagent to he supplied to the agglutinating reaction tank can be reduced, while the dewatering efficiency is not deteriorated.
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