Aeration tank efficiency measuring apparatus and a power control system using the same.

Oxygen concentration in the aeration tank efficiency measuring apparatus includes a vacuum pump for feeding the by-product gas (off-gas) in the captured aeration tank in the gas collection device to the inside, the by-product gas and the atmosphere carried by the vacuum pump (ambient air) in accordance with the invention, the carbon dioxide concentration, temperature, humidity, and calculates a sensor module for measuring the pressure, collection and storage control unit for the measured data from the sensor module, on the basis of the data stored in the control unit in the arithmetic unit and the arithmetic unit for calculating the oxygen transfer efficiency of the aeration tank, It includes a display for outputting the oxygen transfer efficiency values.