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3. Construction and functional principle
The wastewater treatment system works according to the SBR process. A precise description of the pro-
cess can be found in the operating logbook.
The system fundamentally consists of a preliminary cleaning/compensation tank and one or more SBR
tanks.
The feed connection between the preliminary cleaning/sludge storage tank and the SBR tank is at the
front, at the top of the tanks. The feed lift pump is attached directly to the connecting pipe.
The sludge return is attached to the dome shafts. It passes into the preliminary cleaning/sludge storage
tank on an incline.
Mid-connection between
preliminary cleaning tanks
Feed lift pump
Zulauf / inflow
DN 160
Preliminary cleaning/sludge
Figure 1:
Example of a four-tank system.
The pumping processes are carried out using air lift pumps
(or "mammoth" pumps) The special construction of the lifters
ensures that the minimum water level is defined precisely
(see adjacent figure) If the water level drops below the T-
piece, no more water will be pumped out of the tank.
3. Construction and functional principle
DN 110
DN 110
DN 110
DN 110
Preliminary cleaning/sludge
Detailed technical drawings of the systems are available from Otto Graf
GmbH and are applicable for assembly and installation.
These drawings also contain details on the installation of the empty con-
duits and the air hoses.
Sludge recirculation
DN 110
DN 110
Sludge recirculation
DN 110
SBR tank
maximum water
/
Mid-connection between
the SBR tanks
DN 110
DN 110
Excess sludge lifter
DN 110
DN 110
Pipe diffuser
SBR tank
level
minimum water
inflow
compressed air
Operating principle for the feeder
and clear water lifters
DN 160
DN 110
Clear water
lifter
Ablauf / outflow
DN 160
T-piece
level
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