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  • FRANÇAIS, page 47
7.1 Maintenance Preliminary sedimentation + aeration
Note: Please find out who is responsible for the maintenan-
ce of small sewage treatment plants in your area.
For maintenance purposes, work and inspections must be
carried out by the service staff at intervals of approx. 6
months (at least twice every year). The plant components in-
side the tank are easy to maintain. The examination results
of the purified sewage are requested by the Lower Water Aut-
hority as proof of the purification performance (operations
diary).
• Inspection of the operations diary for regular entry of the
We recommend to at least carry out the following tasks:
operating times.
• Checking the plant's state of repair, e.g.: accessibility, ven-
tilation, screw connections, hoses.
• Checking the free mobility of the floater.
• Function check of all mechanical, electrical and other plant
parts, in particular of the compressor and ventilation facili-
ties.
• Function check of the alarm function and control for possi-
ble faults or incidents.
• Inspection of the air syphons (clear water, feeding and slud-
ge syphon) for clogging. For this purpose it may be neces-
sary to remove and clean the air syphons. To do so, unlock
the snap closing on the syphon and pull out the grey air
hose. Afterwards open the red locking lever and pull the air
syphon out of the purification tower. Thus, the syphon incl.
the inside hose can be cleaned of any dirt. Afterwards re-
turn the lever into the appropriate position and connect it
correctly.

7. Maintenance

• If an inadequate ventilation pattern makes it necessary to
clean or replace the aerator spark plug, the latter can be re-
moved via the integrated guide rail on the purification tower.
The aerator spark plug is located underneath the outlet pipe
on the bottom of the tank. Pull out the aerator spark plug by
means of the pertinent air hose. When inserting the aerator
spark plug, pay attention that the integrated guide claw is
placed back into the guide rail on the purification tower. The
aerator spark plug must be let down to the bottom of the
tank.
• Performance of general cleaning work such as e.g.: remo-
val of deposits, removal of foreign matter.
• Pay attention that the floating switch is clean and free floa-
ting.
• Setting optimum performance data (see table page 29) e.g.
oxygen supply (~ 2 mg/l), sludge volume (300 - 500 ml/l).
• Determining the sludge level inside the sludge storage and
possibly initiating the sludge removal.
The maintenance that is carried out must be recorded in the
operations diary.
¾
119
Sampling vessel
Clear water syphon
Feed syphon
Sludge syphon
Discharge pipe
Snap closing
Locking lever
Valve block
Floating switch

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