| 摘要 |
PROBLEM TO BE SOLVED: To provide a filtration treatment device capable of purifying a suspended solid (SS) at high filtration efficiency, and performing a stable filtration treatment for an extended period.SOLUTION: There is provided a filter device having at least a first filter chamber and a second filter chamber communicating with the first filter chamber. In the filter device, the first filter chamber and the second filter chamber are filled with a flotation filter medium respectively, and the flotation filter medium is a porous body made of a resin, and a downflow filtration treatment is performed in the first filter chamber, and an upflow filtration treatment is performed in the second filter chamber.SELECTED DRAWING: Figure 1 |
