Ogawa Environmental Research Institute Inc.

Kamakura, Japan

Ogawa Environmental Research Institute Inc.

Kamakura, Japan
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Ogawa Environmental Research Institute Inc. | Date: 2017-09-27

[Object] To provide a method for appropriately controlling an aeration volume for activated sludge on which aeration treatment is conducted while DO of an activated sludge mixed liquor in an aeration tank is being adjusted to substantially 0 mg/l (ultralow DO treatment). [Solution](1-0) An aeration volume correlation (G = F(Gr)) between an aeration tank and a measuring device is acquired in advance.(1-1) A sample of activated sludge mixed liquor taken during ultralow DO treatment operation is temporarily intensely aerated in the measuring device and then aeration is stopped.(1-2) Based on temporal changes in the measuring device DO value, an oxygen consumption rate Rr and an equilibrium DO value C1 are calculated.(1-3) An appropriate aeration volume G2* of the testing device is acquired by using an Ea-G relationship formula and the like obtained in advance.(1-4) An appropriate aeration volume Gr2* of the aeration tank is obtained by using the relationship G = F(Gr) obtained in (1-0).

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