Installation And Operating Principle - Graf KLARO Easy 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 operating logbook accompanying the switch cabinet of the wastewater
treatment system.
The system fundamentally consists of a preliminary cleaning/compensation tank and a SBR basin (four-
tank systems each include two preliminary cleaning/compensation tanks and two SBR basins).
The connection for feeding between the preliminary cleaning/sludge storage tank and the SBR basin
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 on an incline.
Preliminary cleaning/sludge
storage tank
Feed lifter
Figure 4: Two-tank system with mini tank dome, without sampler.
Aeration of the SBR basin is carried out using disc diffusers.
The pumping processes are carried out using air lift pumps
(or "mammoth" pumps). The special construction of the lifter
ensures that the minimum water level is defined precisely
(see adjacent diagram). If the water level drops below the T-
piece, no more water will be extracted. When installing the
lifter, make sure that the T-piece is installed at the height of
the minimum water level. A table of water levels can be
found in sections 8 and 9.
3. Installation and operating principle
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SBR basin
Disc diffuser
Maximum water
level
Inlet
Operating principle for the feed and clear water lifter
Clear water
Excess sludge
lifter
lifter
Outlet
T-piece
Minimum water
level
Compressed air
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