Ideal for plants with highly polluted waste water

The design of the ejectors for the aeration process corresponds to that of a usual jet ejector. The air to be introduced is compressed in advance. Because of the high oxygen demand of organically polluted waste water and the increasing heights of modern biological waste water treatment plants it is energetically more efficient to pre-compress the air mechanically to the hydrostatic pressure prevailing at the installation point of the ejector and to supply it so to the suction connection. This waiving of a considerable pressure gain in the ejector reduces its necessary motive pressure. At the same time, more favourable mixing ratios (suction flow : motive flow) are achieved.

Körting ejectors are equipped with a non-clogging spiral inside their motive nozzles. The motive jet thus disperses the air already at a low motive pressure in a myriad of fine bubbles which are then mixed vigorously together with the motive flow in the mixing element. This air/water mixture is injected into the aeration tank with a high turbulence. In this way the ejector guarantees optimum oxygen supply and a complete intermixing of the whole tank contents. Even with a high biomass concentration in the waste water it is still possible to attain flow velocities which prevent deposits on the bottom of the aeration tank.