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AssigneeAxel Johnson Engineering AB
InventorsStefan Hother, Gerhard Probst, Klaus Rocznik, Bernd Striegel
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The present invention relates to an apparatus and a process for biological wastewater purification. According to the invention an activation tank (10) is provided in which, with feed of a catalyst, wastewater constituents are degraded by degradation means (11), for example microorganisms, suspended in the wastewater. In the activation tank (10) is disposed at least one lamellae pack (50) in or on which the degradation means (11) suspended in the wastewater are separated out by sedimentation to fall as thickened sedimentation means sludge (11′) to the bottom region (15) of the activation tank (10). In the said bottom region (15) of the activation tank (10) is provided forced recirculation (20, 22) of the degradation means, which takes up the thickened degradation means sludge (11′) and recirculates it as suspended degradation means (11) back to the activation tank (10).
Apparatus for biological wastewater purification comprising:
Apparatus for biological wastewater purification according to one of the preceding claims, characterized in that, in addition, a secondary sedimentation tank (30) which is operationally connected to the activation tank (10;
Apparatus for biological wastewater purification according to one of the preceding claims, characterized in that the said forced recirculation of degradation means (20, 22) comprises a transport means (20) and a bottom scraper (22) which interact operationally firstly to collect the thickened degradation means sludge which has collected in the bottom region (15) of the activation tank (10;
Apparatus for biological wastewater purification according to one of the preceding claims, characterized in that the said bottom region (15) extends to below at least one lamellae pack (50) and comprises a bottom piece which is inclined in relation to the wastewater surface for forced recirculation of degradation means, the inclination of which bottom piece reinforces the recycling of the thickened degradation means sludge.
Process for biological wastewater purification which comprises the following steps:
Dependencies are inferred from the claim text.