SEPARATION OF FINE PARTICLE IN SUSPENSION

PURPOSE:To attain to miniaturize a flocculative precipitation apparatus, by relatively moving a suspension and columnar matter to generate a Karman vortex in the suspension behind the columnar body, and performing flocculation of fine particles in the suspension by a simple addition apparatus. CONSTITUTION:A flocculant (e.g., a high-molecular flocculant) is added to raw water entering through an inlet 1 from a nozzle 2 and columnar matters 4 are set in a flowline formed by flow inhibiting plates 3 at appropriate intervals so as to prepare for the attenuation of a Karman vortex C and to be capable of repeatedly generating the Karman vortex. In this state, flocs are flocculated in the vortex C, densely compacted and rapidly precipitated during the passage of a fluid A through the flowline and the formed sludge is discharged from the sludge withdrawing port 6 provided to the lower part while supernatant treated water is obtained from a fluid outlet 5. When fine particles in raw water are solid particles, the density of formed flocs becomes high and the succeeding dehydrating operation is made favorable.