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6.5 Operation
The Depurbox treatment station is an activated sludge total oxidation treatment system
which becomes fully operative approximately thirty
days after initial start-up. In particular weather conditions (e.g.: intense cold) more time may be required for the bacterial flora to form.
The treatment process is divided into three stages:
1 primary
settlement
2 aeration
3 secondary
settlement
The various stages are governed by the timed operation of the pump at pre-established intervals. Internal aeration is provided by a Venturi-
effect fan powered by a submerged pump which also mixes the incoming wastewater. The treated wastewater leaves the station by gravity
and is not pumped.
For further information
→
sections 10.1, 10.2, 10.3 and 10.11.
7.
Maintenance, service and spare parts
Information for maintenance personnel
Before proceeding with any maintenance operations, check that all the connections (even those that are
potential-free) are voltage-free.
Maintenance operations may only be performed by skilled and qualified people. Use suitable equipment and
protective devices. Observe all accident prevention regulations. If the treatment station must be emptied,
make sure that the drained liquid cannot harm people or damage property.
The pump can be removed from its tank for maintenance or replacement purposes.
Do not lift or carry the pump by its power cable.
Read the pump operating manual.
The pump motor contains non-toxic cooling oil. Any leaks through the mechanical seal may pollute the
pumped liquid.
7.1 Monthly
maintenance
Perform the following maintenance operations at least once a month.
1
Check the external air inlet.
2
Check the pump works correctly.
3
Check the inside of the station.
4
Remove any encrustations and/or deposits inside the tank of the Depurbox BASE (incoming wastewater area,
→
section
10.1.1., part n° 5) and of the primary settler of the Depurbox MAXI and DUO (
→
sections 10.1.2. and 10.1.3, part n° 15).
5
Carefully clean the inspection pits (
→
sections 10.3.2. and 10.3.3, part n° 1).
7.2 Annual maintenance
Perform the following maintenance operations at least once a year.
1
Check the pump works correctly.
2
Have the discharge water analysed (take a sample from the relative pit,
→
section 10.3.2, part n° 3 and section 10.3.3, part
n° 4) in order to measure the quantities of pH, SS, COD, BOD
5
, Ammonia N, Nitric N, Nitrous N, Total P, Total Surface-Active
Agents.
3
Check the inside of the station.
4
Carefully clean the primary settler and dispose of the resulting sludge by purging according to local and/or national waste
disposal regulations, laws and standards. In the Depurbox BASE version, the primary settler is located in the first sector (
→
section 10.9.1, sequence 1-2-3), while in the Depurbox MAXI and DUO versions it is located in the Imhoff tanks (
→
section
10.9.2).
7.3 Two-yearly maintenance
Perform the following maintenance operations at least once every two years.
1
Points 1-4 of yearly maintenance above.
2
Reduce the quantity of sludge in the oxidation chamber and dispose of the resulting sludge by purging according to local
and/or national waste disposal regulations, laws and standards. In the Depurbox BASE version the oxidisation chamber is
located in the second sector (
→
section 10.9.1, sequence 4). In the Depurbox MAXI and DUO versions it is located in the first
sector (
→
section 10.9.3)
Do not remove all the sludge in the chamber as this could cause the treatment station to malfunction. Do
not reduce the level by more than a third with respect to the starting level.
WARNING
WARNING
WARNING
WARNING
WARNING
