| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an aeration apparatus capable of more reliably preventing a pipeline from being clogged with sludge.SOLUTION: A water treatment method for treating water to be treated containing organic substances includes: a biological reaction step of treating organic substances in the water to be treated by biological degradation; a flotation step of supplying the water to be treated to a flotation part 20 having a water tank 21 equipped with a bubble supply part 22 having a bubble supply port 22a after the biological reaction step, and separating the water to be treated into concentrated sludge Ps and water to be secondary treated having a reduced sludge concentration by pressure flotation; and a membrane filtration step of membrane filtering the water to be secondary treated. The water to be secondary treated is supplied to the membrane filtration step from a position lower than the bubble supply port.</p> |
