| US 7,575,684 B2 | ||
| Waste water treatment apparatus and waste water treatment method | ||
| Kazuyuki Yamasaki, Hiroshima (Japan); and Kazuyuki Sakata, Fukuyama (Japan) | ||
| Assigned to Sharp Kabushiki Kaisha, Osaka (Japan) | ||
| Filed on Sep. 12, 2006, as Appl. No. 11/519,224. | ||
| Claims priority of application No. 2005-363791 (JP), filed on Dec. 16, 2005. | ||
| Prior Publication US 2009/0101573 A1, Apr. 23, 2009 | ||
| Int. Cl. C02F 3/30 (2006.01) | ||
| U.S. Cl. 210—605 [210/623; 210/631; 210/259; 210/903] | 9 Claims |
| 6. A waste water treatment method, comprising the steps of:
introducing waste water containing aminoethanol to a raw water tank, a denitrification tank, a reaeration tank having a semi-anaerobic
section, a contact oxidation tank and a settling tank in sequence;
circulating treatment water by an air-lift pump from the reaeration tank to the denitrification tank; and
mixing biologically treated water and/or sludge generated by biological treatment and mineral sludge containing calcium from
the settling tank in a mineral mixing tank, and returning a resultant mixture to the raw water tank.
|