US 11,945,739 B2
Testing method for wastewater treatment facility
Toshihisa Gohda, Tokyo (JP)
Assigned to GOHDA WATER TREATMENT TECHNOLOGY CO., INC., Tokyo (JP)
Appl. No. 17/436,292
Filed by GOHDA WATER TREATMENT TECHNOLOGY CO., INC., Tokyo (JP)
PCT Filed Mar. 11, 2019, PCT No. PCT/JP2019/009727
§ 371(c)(1), (2) Date Sep. 3, 2021,
PCT Pub. No. WO2020/183577, PCT Pub. Date Sep. 17, 2020.
Prior Publication US 2022/0177337 A1, Jun. 9, 2022
Int. Cl. C02F 3/00 (2023.01); C02F 3/12 (2023.01); G01N 33/18 (2006.01)
CPC C02F 3/006 (2013.01) [C02F 3/1236 (2013.01); G01N 33/18 (2013.01); C02F 2203/006 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A testing method for testing a state of an aeration tank in a wastewater treatment facility, comprising obtaining a difference between: a sedimentation amount when a given period of time has elapsed after an activated sludge mixed liquid collected from the aeration tank and water having a higher dissolved oxygen concentration than the activated sludge mixed liquid are poured into the same container and mixed together; and a sedimentation amount when a period of time equal to the given period of time has elapsed after the activated sludge mixed liquid collected from the aeration tank and water having a lower dissolved oxygen concentration than the activated sludge mixed liquid are poured into the same container and mixed together.