| 摘要 |
PROBLEM TO BE SOLVED: To provide a filtration method and a filtration device lengthening filtration life by removing suspended solids in processing water before it is captured by filter media. SOLUTION: In the filtration method for carrying out filtration by a filtration device, water in which gas is dissolved under pressure is mixed to raw water, the dissolved gas is released in the filtration device as fine bubbles at the time of carrying out a filtration of raw water to which the gas-dissolving water is mixed, and filtration is carried out while suspended components contained in the raw water deposit on the fine bubbles and is separated and floated up. In the filtration device in which raw water-pouring piping, a filtration material and processing water discharge piping are arranged, a pressurized water manufacture device for manufacturing pressurized water in which gas is dissolved under pressure in water is arranged and pressurized water mixing piping of the device is connected to raw water mixing piping.
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