SLUDGE BIOLOGICAL SYSTEMS (PROLONGED AEREATION)
water waste coming from built-up areas and the biological water coming
from industrial activities can be treated with active sludge depuration
In case of civil waste the depurating
treatment foresees the following steps:
DECANTATION. It takes place in an Imhoff tank in order
to hold floating materials and likely sedimentable bodies to obtain
a partially clarified effluent reducing the polluting load of approximately
30%. The soapy waters are pre-treated in a grease condensing tank.
OXIDATION. It takes place in an oxidation tank where the
civil waste comes into contact with microorganisms that, with oxygen
from blow side pipes, transform the organic substance into stable
matter. The destruction of the polluting loads can get to 98% and
it is closely correlated to the concentration of active sludge in
the tank, to the applied organic load and to the retention time.
DECANTATION. It takes place in the hopper-shaped chamber,
where the sludge goes down to the base of the tank and the purified
water comes out through a small baffle in the sample taking pit
and then discharged to the receiving body. The decantated sludge
is then taken and put into cycle in the oxidation tank.
In case of industrial biological waste
that is treated in active sludge systems, proper pre-treatments are
foreseen. They can change according to the sewage to be treated.
According to the user’s needs the
following systems can be designed and manufactured:
systems, where the oxidation and decantation are made in
only one tank (also monolithic-tank) separated by a divider
||Module systems in
parallel that can be activated at two different moments. For this
reason this type of system is suitable for those users who haven’t
reached the full working capacity of the project but the system
has to work immediately after the installation
with pre-treatment activities and specific equipment according to
the typology of sewage to be treated
Activating and management programs are
elaborated according to the users’individual needs.