BARRIER OXIDATION DITCH HAVING INCREASED FLOW EFFICIENCY AND OXYGEN TRANSFER EFFICIENCY

摘要

ABSTRACT OF THE DISCLOSUREAn improved barrier oxidation ditch is provided whichhas an inclined duct for the induced flow, whereby energy in thedammed-up momentum is more efficiently released. This induced-flow duct is inclined at 30° to 60° to the horizontal, preferably45°, and is disposed upstream of, downstream of, or alongside ofthe circulator/aerator in the intake channel. The induced-flowduct is preferably rectangular in cross-section and may have itsdownstream wall formed by the barrier if it is downstream of thecirculator/aerator. It is connected at its lower end to the dis-charge duct to initiate a combined-flow portion thereof. Anin-channel clarifier, disposed in the discharge channel so thatits upstream wall is the barrier and its solid bottom is theceiling of the combined-flow portion of the discharge duct,provides prolonged bubble retention time at maximum hydraulicpressure, whereby the efficiency of oxygen transfer is increased.