| 摘要 |
PURPOSE:To enable long-term stable treatment by avoiding the lowering of capacity due to the adhesion of scale in a reverse osmosis membrane apparatus. CONSTITUTION:Purifying treatment due to aerobic bacteria is applied to org. waste water and the treated water is filtered by an ultrafiltration membrane and the water transmitted through the ultrafiltration membrane is subjected to reverse osmosis membrane treatment to obtain highly treated water. In this method, the aeration amount to org. waste water during purifying treatment due to aerobic bacteria is controlled on the basis of the pH value of the treated water to continuously subject acidic treated water to ultrafiltration. |
