Biological waste water purification process and device
AssigneeMesser Griesheim GmbH
InventorsMonica Hermans, Ulrich Hermanns, Sigurd Schlegel, Andreas Stein
Life of this patent
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Abstract
Biological wastewater is purified in a sewage treatment plant having an activation tank of a depth greater than approximately 5 m per meter into which a feed of compressed air is fed. An oxygen-containing gas having an oxygen content is increased with respect to the air or pure oxygen and is fed to the mixed liquor in at least a part of the aerobic tank volume of the activation tank. The oxygen containing gas is fed until the total content of the gas in the mixed liquor based upon saturation value is below 150% before the mixed liquor is fed to a secondary clarification.
Claims10
A process for biological wastewater purification in a sewage treatment plant having an activation tank of a depth greater than approximately 5 m into which a feed of compressed air is fed, whereby separated in space or separated in time from said feed of compressed air an oxygen-containing gas having an oxygen content increased with respect to air, or pure oxygen, is fed continuously or at intervals, to a mixed liquor in at least a part of the aerobic tank volume of the activation tank, characterized in that said oxygen-containing gas is fed until the total content of gas in the mixed liquor, based on the saturation value, is below 150%, before the mixed liquor is fed to a secondary clarification.
Dependencies are inferred from the claim text.