Title:
汚水処理方法および装置
Document Type and Number:
Japanese Patent JP6939724
Kind Code:
B2
Abstract:
To provide a sewage treatment method and apparatus that can efficiently and inexpensively remove nitrogen from wastewater with smaller equipment, to solve the "circulation line" shortcomings of a conventional circulating nitrification and denitrification method.SOLUTION: The above-described problem is solved by providing a sewage treatment apparatus, including an anoxic tank, a microaerobic tank, an aerobic tank, and a sedimentation basin installed in a subsequent stage, in which the aerobic tank stores a microorganism-immobilized carrier supporting nitrifying bacteria, and the problem is solved by providing a sewage treatment method, including: returning at least a part of a sludge extracted from the sedimentation basin to the anoxic tank, in which a dissolved oxygen concentration in the microaerobic tank is equal to or less than a dissolved oxygen concentration in the aerobic tank, and the dissolved oxygen concentration in the aerobic tank is 1.0 mg/L or more and 3.0 mg/L or less without returning nitrifying liquid from the aerobic tank to the anoxic tank.SELECTED DRAWING: Figure 1
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Inventors:
Takeshi Yamakawa
Saito Isao
Nobuyoshi Goto
Aizumi Sato
Baba Kei
Saito Isao
Nobuyoshi Goto
Aizumi Sato
Baba Kei
Application Number:
JP2018131233A
Publication Date:
September 22, 2021
Filing Date:
July 11, 2018
Export Citation:
Assignee:
JFE Engineering Corporation
International Classes:
C02F3/30; C02F3/08; C02F3/12; C02F3/34
Domestic Patent References:
| JP2000279992A | ||||
| JP2000279993A | ||||
| JP2000015288A | ||||
| JP2017177105A | ||||
| JP2017013014A | ||||
| JP8323393A |
Foreign References:
| CN103922472A |
Attorney, Agent or Firm:
Masahiro Tanaka