9
4 DESLUDGING
When do you need to pump out the plant?
Desludging is required to remove accumulated solids when one or more of the following conditions
are present:
Biological treatment performance is severely deteriorated due to excessive amounts of oil or
chemicals which interfere with the bacterial activity.
Excessive scum or sludge builds up in the sedimentation chamber.
Abnormal rise of the water level
Excessive scum builds up in the anaerobic filtration chamber and large amounts of solids flow
into the aerobic contact filtration chamber.
Sludge layer at the bottom of the anaerobic filtration chamber builds up to reach the bottom of
the filtration media and the sludge flows into the next chamber.
Excessive suspended solids are observed in the aerobic contact filtration chamber and the
symptoms do not improve even after performing a sludge transfer.
Desludging Procedures
Step 1.
Turn off all electrical components.
Step 2.
Clean the inlet and outlet pipe.
Step 3.
Transfer suspended solids in the aerobic chamber and scum / sludge in the storage
chamber to the sedimentation chamber.
Step 4.
Remove scum and sediment build-up on the filtration media in the anaerobic filtration
chamber.
IMPORTANT!
If sludge in the sedimentation chamber is pumped out before scum / sediment on the
media is removed, scum is drawn into the filtration media as the water level drops.
Outflow openings
