Page 98 - Bluebook Sereco english

www.sereco.it

Southern Hemisphere is clockwise (it is however pos- Available on the catalogue there also is the equipment
sible to supply clarifier bridges with direction of rota- necessary for the clarification on rectangular tanks, in
tion different from the standard one). particular backward and forward traveling bridges with
If it is desired to have a more effective removal of the a sludge scraping or suction recovery system on the
floating materials, besides selecting the mobile girder bottom, floating recovery system of scraping type, or
type (the diametric one has double efficiency with settlement systems with chain scrapers.
respect to the radial one), the scum box length might The range of SERECO products also comprises an
be modified or two scum boxes might be installed in a effective dissolved air flotation system (DAF) available
diametric position with respect to the clarifier (further in many sizes and with different characteristics.
efficiency doubling). In any circular type of clarifiers it It is finally possible to prefer lamellar pack clarification
is possible to install the channel cleaning system con- systems, very interesting for their compactness and
sisting of sliding brushes or a rotating brush. Moreover efficiency, much used for the primary or tertiary sedi-
any types of circular clarifier can be provided with cur- mentation processes. They carry out the countercurrent
rent baffles which maximize the sedimentation effi- clarification that, according to the long experience of
ciency with an adequate guide of the fluid threads. SERECO, has proven more effective; this is also con-
The wide range of SERECO products also allows to firmed by the specific technical literature.
select bridges that, rather than the peripheral control, Any models are available in carbon steel protected with
are supplied with wholly central drive. The central drive hot dip galvanization, stainless steel or aluminum.
bridges (even of big size, up to a 60 m diameter) are SERECO has directly experienced and therefore rec-
supported by means of the central slewing ring and ommends the installation of clarifiers having the sur-
driven by a sturdy gear motor connected to the slew- faced parts (such as the mobile girder) in aluminium
ing ring. This way, the clarifier volume is free from any and the underwater parts in stainless steel. To this cri-
mechanical part in motion and makes, for example, the terion, lightness, sturdiness and resistance to corrosion
installation of lamellar packs possible in its inside; fur- will be joined. The higher initial investment will be
thermore the maintenance on the clarifier concrete amortized in a very few years thanks to the reduced
wall, necessary in peripheral drive bridge in correspon- maintenance expenses.
dence of the traction trolleys, is avoided, and it is SERECO, always aiming at the environmental protec-
noticeably reduced the general maintenance due to the tion, at making progresses in the research & develop-
lower quantity of mechanical parts. ment field, also thanks to the minimization of the elec-
As support of the settlement in the chemical-physical tric power consumption of its equipment, is in a posi-
treatment processes, it is possible to select clarifloc- tion to supply, on specific request, clariflocculators, dis-
culators (with central or peripheral control) having, as solved air flotation units or clarifiers fed by solar ener-
an integral part, a turbine of adequate profile or sev- gy with the installation of photovoltaic panels. In fact it
eral electric agitators gate type which allow the mix- is expected that due to its increasing efficiency and life,
ing with reagents, coagulation flocculation and final its lower and lower installation cost, the photovoltaic
clarification processes inside the same tank. In this panel system can be a valid alternative, especially where
units, the dimensions of the central deflector are such the electric power procurement is a problem or in iso-
as to ensure an adequate flocculation time. late places and/or in places far from the city network.