PLANT AND CONTROL METHOD FOR AEROBIC TREATMENT Russian patent published in 2018 - IPC C02F3/26 

FIELD: water and air purification technology.

SUBSTANCE: group of inventions relates to a treatment plant and a method for controlling such a treatment plant suitable for treatment of waste water. Treatment plant comprises circulation channel (2) adapted to house a liquid, aeration arrangement (5) adapted to supply a gas flow Q comprising oxygen to the liquid, at least one flow generating machine (10) arranged in circulation channel (2) and adapted to generate a liquid flow along circulation channel (2), and control unit (11). Treatment plant method comprises the steps of providing a gas flow Q to the liquid by means of aeration arrangement (5); operating flow generating machine (10) at 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 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. Wherein the oxygen transfer rate is adjusted by adjusting the gas flow Q provided by aeration arrangement (5) as well as adjusting the operational speed f of flow generating machine (10), in order to guide the value of said process parameter towards said set value.

EFFECT: group of inventions provides the reduced total power consumption when a given oxygen transfer rate is reached or when a given range of the dissolved oxygen level in the liquid is maintained.

14 cl, 2 dwg