9
Operation manual
ACO Clara
3.7
Mechanical pretreatment
The mechanical pretreatment is divided into two chambers using a partiti-
on with holes. The first is open to the inlet pipe. Here solids are deposi-
ted and the substances floating on the water surface are trapped. The
pretreated water from the second chamber is pumped by the air-lift
pump for raw sewage water (Pos. 9) to the activation tank, while the
pumped volume is controlled by the backflow box (Pos. 15) at the mouth
of the air-lift pump. The air-lift pump for raw sewage water is protected
against getting blocked by these solid impurities by a scum board.
During operation the buffer tank is gradually
filled up, so that the content of this tank has
to be removed if needed; see Chapter 6.4.11.
Buffer area
The waste water is accumulated in the sedimentation tank during hydrau-
lic peaks in the daily peak period and is pumped gradually to the biologi-
cal part. This ensures that its load is uniformly distributed, which helps to
achieve the excellent purification qualities of the whole plant.
The pretreated water from the second chamber is continuously pumped
by the air-lift pump for raw sewage water (Pos. 9) to the activation tank.
With a higher flow rate through the air-lift pump a part of the water is
returned by overflow to the buffer tank.
Storage accommodation
The air-lift pump that pumps the surplus sludge from the activation tank
during desludging (reduction of activated sludge concentration) is open
to the first chamber. The surplus sludge forms sediment here. With a full
biological load the storage accommodation will be filled up within 100-
150 days.
3.8
Activation tank
The aeration elements (Pos. 8) are placed in the activation tank. These
elements ensure micro-bubble aeration. They are placed in such a way as
to ensure the ideal agitation of the whole space of the activation tank.
The aeration elements are placed on a distribution main which is fixed to
the bottom of the activation tank. Air supply from air distributor (Pos. 13)
is provided by flexible hose.
The activation tank is interconnected with the final sedimentation tank by
the connecting pipe.
The air-lift pump for the pumping of surplus sludge (Pos. 11) leads from
the activation tank to the first chamber of pretreatment.
3.9
Final sedimentation tank
The activated sludge flows through the stilling cylinder into the final sedi-
mentation tank, where the activated sludge is separated from the treated
water by the effect of gravity. The treated water then flows away over
the outlet object (Pos. 14) of the plant by overflow to the outlet pipe
(Pos. 2) and the sedimented activated sludge is pumped from the sludge
sump by the air-lift pump for return sludge (Pos. 10) back to the activati-
on tank.
3.10
Ventilation pipe
It is designed for an air outlet, supplied for the activation and driving of
the air-lift pumps, outside the tank. The outlet of the ventilation pipe (Pos.
3) DN 100 is blocked off with a cap from the factory. For plant ventilati-
on, see Chapter 5.3. The ventilation pipe is marked VENTILATION.
Summary of Contents for ClarA 19-38
Page 1: ...Waste water treatment plant ACO ClarA 19 38 24 48 30 60 38 76 48 96 60 100 Operation manual ...
Page 28: ...28 Operation manual ACO Clara F2 F1 OFF O 0 OFF A C D B ...
Page 32: ...32 Operation manual ACO Clara p VACUUM p PRESSURE OFF O 0 OFF A C 1 C 2 B ...
Page 33: ...33 Operation manual ACO Clara No D H XXXXX F D 1 D 2 E ...
Page 36: ...36 Operation manual ACO Clara PRESSURE p p VACUUM OFF O 0 OFF A C 1 C 2 B ...
