Method of biologically cleaning polluted water
OwnerBent Tholanderinventor
Life of this patent
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Abstract
A method of biologically cleaning polluted water uses active sludge and at least three zones, where at least one zone operates as a biological treatment zone and at least two zones variably operate as a biological treatment zone and as a clarifying zone. By this method, the polluted water is fed to a zone operating as a permanent biological treatment zone, where a back-mixing is performed during a period between this zone and a zone variably operating as a biological treatment zone and which has operated as a clarifying zone during a previous period. As a result, the drawbacks are overcome which the known T- and V-channel methods are encumbered with.
Claims26
A method of biologically cleaning polluted water by employing active sludge and at least three zones, of which at least one operates as a permanent biological treatment zone and at least two zones variably operate as a biological treatment zone and a clarifying zone, characterised in that (a) the variable zones are connected to the permanent biological treatment zone by means of a one way gate designated in such a way that flow created by the aerators in the variable zones can pass to the permanent biological treatment zone, whereas flow created by the aerators in the permanent biological treatment zone cannot pass to the variable zones;
- (b) the polluted water is constantly fed to a zone operating as a permanent biological treatment zone;
- (c) the aerators in this zone run continuously, and (d) during a period a back-mixing is carried out between said zone operating as a permanent biological treatment zone and a variable zone operating as a biological treatment zone, the latter zone operating as a clarifying zone during a previous period.
Dependencies are inferred from the claim text.