Installation And Operating Principle - Graf Oneadvanced Commercial Notice D'installation

3

Installation and operating principle

The wastewater treatment system operates according to the SBR process. A precise description of the
process can be found in the log book.
The system fundamentally consists of one or more preliminary cleaning/compensation tanks and one or
more SBR anks.
The connection for charging between the preliminary cleaning/sludge storage tank and the SBR tank
passes through the end faces at the tops of the tanks. The feed lifter 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 under the action of gravity.
Centre connection between the
preliminary cleaning tanks
Feed lifter
Zulauf / inflow
DN 160
Preliminary cleaning/sludge
Figure 1: Example four-tank system.
The pumping processes are carried out using air lift pumps
(or "mammoth" pumps). The special construction of the lift-
ers ensures that the minimum water level is defined pre-
cisely (see adjacent figure). If the water level drops below
the T-piece, no more water will be extracted.
3 Installation and operating 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 present routing details for the conduits and air
hoses.
Sludge return
DN 110
DN 110
Excess sludge lifter
Sludge return
DN 110
SBR tank
Maximum water
level
Inlet
Operating principle for the feeder
25 / 112
Centre connection between the
SBR tanks
DN 110
DN 110
DN 110
Clear water
lifter
DN 110
DN 110
Pipe aerator
SBR tank
T-piece
Minimum water level
Compressed air
and clear water lifters
DN 160
Ablauf / outflow
DN 160