METHOD AND DEVICE FOR FLOCCULATION

PURPOSE:To remarkably reduce the consumption of a flocculant and to remove fine particles by providing an injection pipe for injecting a liq. in a mixing tube and controlling the flow of the liq. mixture of the liq. and contaminated water in the mixing tube and the flow of the liq. in the injection pipe. CONSTITUTION:A dispersion chamber 3 for dispersing contaminated water and one or plural mixing tubes 5 with one end opened to the chamber 3 and the other end to a solid-liq. separation chamber 4 are provided in a liq. feed chamber 1. One or plural injection pipes 6 for injecting the liq. are furnished in the mixing tube 5. The contaminated water is separated into the contaminant fine particles and supernatant liq. by the flocculator. In this case, the flow of the liq. mixture of the liq. and contaminated water in the mixing tube 5 is controlled to 10