| 摘要 |
A method of closed-loop control of a waste water treatment plant 10 comprises: obtaining a fluid sample from a fluid of the plant; providing the fluid sample to a sealed chamber (106, Fig. 2a) such that the fluid sample incompletely fills the sealed chamber leaving a headspace (104, Fig. 2a); incubating the fluid sample in the sealed chamber; determining a change in pressure in the headspace during said incubating; and controlling a degree of aeration of said waste water treatment plant responsive to the change in pressure. The fluid sample may comprise a sample of influent to the plant or a sample of returned activated sludge in the plant. A control system is also claimed which comprises a culture vessel 100 and a data processor 210. The culture vessel comprises a sealable chamber for culturing a fluid sample and a pressure measurement transducer for measuring a pressure in a headspace of the chamber. The data processor receives pressure data from the pressure measurement transducer, determines at least one parameter relating to the plant from the pressure data and outputs data for controlling a degree of aeration of the plant, dependent on the at least one parameter. |
