Apparatus for cleaning wastewater

#This application is a National Phase of International Application No. PCT/EP2010/003606, which was filed on Jun. 16, 2010, and which claims priority to and the benefit of German Patent Application No. 102009025082.4, filed on Jun. 16, 2009, and the disclosures of which are hereby incorporated herein by reference in their entireties.

#The invention relates to a method and a device for cleaning waste water using aerobic microorganisms.

#There are already known numerous methods and devices for cleaning waste water using aerobic microorganisms. However, as a rule, the known devices have the deficiencies that an intricately constructed apparatus and a corresponding constructional effort is required in order to achieve a satisfactory throughput through the device and, thereby, an economic purification of the waste water.

#Embodiments of the invention are now described with respect to the enclosed drawings in which:

#FIG. 1 shows a schematic section through a device for cleaning waste water,

#FIG. 2 shows a perspective partial view of the device according to FIG. 1 with a partially cut away tank wall of a throughput tank; and

#According to FIG. 1, the device for cleaning waste water comprises a throughput tank 2 having a planar tank bottom 4 and a tank wall 5, through which tank the waste water to be cleaned is led. In operation, the throughput tank 2 is filled with the waste water to be cleaned and with freely movable suspended filler bodies 34 populated with microorganisms.

#Rectangular distribution tubes 6 are welded into the tank bottom 4 so that at least one side of the distributor tubes 6 is in contact with the waste water to be cleaned. Preferably, the distributor tubes 6 are, as seen in FIG. 1, welded into the tank bottom 4 in such a way that two of its side surfaces are in an angle of 45° to the planar tank bottom 4 so that two sides of the distribution tubes 6 are in direct contact with the waste water to be cleaned. In this 45° position, the distributor tubes also act at maximum as mechanical reinforcement of the bottom, and, furthermore, the 45° position of the nozzle surfaces in contact with the water causes an optimal separation and distribution of the gas bubbles exiting the ventilation nozzles 8 into the water. Nozzle openings 8 are provided at the sides of the distribution tubes 6 which are in contact with the waste water to be cleaned. The nozzle openings have the shape of holes or slits, preferably are round bores having a diameter of approximately 3 to 6 millimeter, and they are distributed across the hole length of the distribution tubes 6.

#The distribution tubes 6 are provided with inspection glasses 50 at their face sides. The distribution tubes 6 comprise, on at least one end of the tube, a stub 32 for the supply of oxygen-containing gas, for example air, to the distributor tubes 6. The tank bottom 6 comprises at least one inflow connecting pipe 24 for the waste water to be cleaned.