| 摘要 |
PROBLEM TO BE SOLVED: To provide a water treatment method capable of suppressing the rise of a transmembrane pressure difference without damaging activity of sludge even if a water soluble polymer is added to treated water processed by activated sludge treatment.SOLUTION: A water treatment method comprises separating treated water added with a water soluble polymer and processed by activated sludge treatment into solid and liquid by a separation membrane, wherein addition of the water soluble polymer is performed during stopping solid-liquid separation. It is preferable to use at least one polymer of a cationic polymer and an amphoteric polymer. |
