CPC C02F 3/006 (2013.01) [C02F 3/1236 (2013.01); G01N 33/18 (2013.01); C02F 2203/006 (2013.01)] | 18 Claims |
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.
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