公开(公告)号：US20040134856A1

公开(公告)日：2004-07-15

申请号：US10739078

申请日：2003-12-19

Applicant: Kuraray Co., Ltd.

Inventor： Hiroaki Fujii ,  Tsutomu Miura ,  Goro Kobayashi ,  Yasuhiro Baba

IPC: C02F001/44

CPC classification number: C02F3/1221 ,  B01D61/145 ,  C02F1/444 ,  C02F3/085 ,  C02F3/1268 ,  C02F11/06 ,  C02F11/121 ,  Y02W10/15

Abstract: A method of treatment of waste water includes a sludge flocculating step of obtaining a supernatant liquid by flocculating within a flocculation tank 4 the sludge having been treated within an activated sludge aeration tank 3 where the waste water and an activated sludge are brought into contact with each other in an aerobic condition, a sludge concentration retaining step of retaining a concentration of a sludge within the activated sludge aeration tank 3 at a predetermined value by returning portion of a sludge within the flocculation tank 4 to the activated sludge aeration tank 3, an excessive sludge complete oxidation step of maintaining an excessive sludge, which is the sludge supplied from the flocculation tank 4, but exclusive of that portion of the sludge returned from the flocculation tank 4, in a complete oxidation state in which a speed of propagation of the sludge and a speed of self-oxidation of the sludge within the complete oxidation tank 5 are held in equilibrium with each other; and an excessive sludge filtration step of filtering a waste water containing the sludge within the complete oxidation tank 5, through a separation membrane 6 having a pore size not larger than 5 nullm to thereby discharge a resultant filtrate in a quantity corresponding to an amount of a water component in the complete oxidation tank 5 increased.

Abstract translation: 污水处理方法包括污泥絮凝工序，通过在絮凝槽4内絮凝得到上清液，所述污泥在活性污泥曝气池3内处理过的污泥，废水和活性污泥与各自接触 其他在需氧条件下，通过将絮凝槽4内的污泥的一部分返回到活性污泥曝气池3，将活性污泥曝气池3内的污泥浓度保持在规定值的污泥浓缩保持工序，过量 污泥完全氧化步骤，其保持过滤污泥，其是从絮凝罐4供应的污泥，但不包括从絮凝罐4返回的部分污泥，其处于完全氧化状态，其中污泥的传播速度 并且整个氧化池5内的污泥的自氧化速度与e保持平衡 ach其他 以及过滤污泥过滤步骤，通过孔径不大于5um的分离膜6过滤含有污泥的废水在完全氧化槽5内，从而将所得滤液以对应于 完整氧化池5中的水分增加。