| 摘要 |
PROBLEM TO BE SOLVED: To increase the efficiency of turbid water treatment by efficiently defoaming bubbles generated from turbid water.SOLUTION: Turbid water W0 is transferred to a second raw water tank 28 through a first raw water tank 26 from a turbid water storage tank 22, and PAC transferred from a PAC (Poly Aluminum Chloride) tank 24 is added to the turbid water in the second raw water tank 28. Further, in a mixing part 32, the turbid water W0 transferred to a precipitation separation tank 34 from the second raw water tank 28 is mixed with treatment water W2 to which a polymer coagulant is added. The turbid water to which the polymer coagulant is added in the mixing part 32 is transferred to the precipitation separation tank 34. The turbid water W0 housed in the precipitation separation tank 34 is coagulated by action of PAC and the polymer coagulant, and a slurry S is precipitated. A defoaming agent having a specific gravity of 1.0 or more and 1.1 or less for defoaming bubbles generated from the turbid water W0 to which the PAC and the polymer coagulant are added in a second step is injected to the turbid water W0. Supernatant water W1 in the precipitation separation tank 34 is discharged through a filtration filter 3404 and a fresh water tank 36. |
