| 摘要 |
<p>PURPOSE:To make it possible to control automatically dissolved oxygen and to operate stably by measuring dissolved oxygen in a biotreatment water tank by means of a dissolved oxygen meter, converting the measured value to an electric signal by means of a signal convertor and controlling the number of rotation of a blower based on the signal value through a control instrument. CONSTITUTION:Air is fed into a biotreatment water tank 1 of a waste water treating apparatus through an air scattering device 2 by means of a blower 3. In this case, a dissolved oxygen meter 6 measures dissolved oxygen in the biotreatment water tank 1. In addition, a signal convertor 7 converts the measured value of the dissolved oxygen meter 6 to an electric signal. Furthermore, a rotation control instrument 8 controls the number of rotation of the blower 3 by the electric signal from the signal convertor 7. As the result, it is possible to control automatically dissolved oxygen and to operate stably and therefore, it is possible to keep performance of the waste water treating apparatus based on biotreatment.</p> |
