| 摘要 |
The invention relates to a treatment plant and a method for controlling such a treatment plant suitable for treatment of waste water. The treatment plant comprises a circulation channel (2) adapted to house a liquid, an aeration arrangement (5) adapted to supply a gas flow Q comprising oxygen to the liquid, at least one flow generating machine (10) arranged in the circulation channel (2) and adapted to generate a liquid flow along the circulation channel (2), and a control unit (11). The method is characterized by the steps of providing a gas flow Q to the liquid by means of the aeration arrangement (5), operating the flow generating machine (10) at an operational speed f to generate a liquid flow, measuring at least one process parameter which, directly or indirectly, provide an indication of the oxygen transfer rate to the liquid in the treatment plant (1), comparing the measured value of said process parameter with a set value, adjusting the oxygen transfer rate to the liquid in the treatment plant (1) if a difference between the measured value of the process parameter and the set value is determined, the oxygen transfer rate of the treatment plant (1) being adjusted by adjusting the gas flow Q provided by the aeration arrangement (5) as well as adjusting the operational speed f of the flow generating machine (10), in order to guide the value of said process parameter towards said set value. |
