germ-free circulating water with the latest generation of green
concentration of hardness salts and corrosion products in the
circulating water of cooling towers inevitably rises during operation.
These pollutants build up sediments and deposits on tank bottom and
pipelines, and scalings on mechanical or sensorical parts disturbing
Additionally, any open system is contaminated with microorganisms such
as bacteria and algae from the environment, who reproduce and prosper
especially in system sections where they find their favored
temperature, and with anorganic deposits working as 'primer' they build
up persistent biofilms. The harsh biocidal chemicals commonly used for
fighting biological contamination unfortunately also generate heavy
corrosion in the system. On the other hand, without an effective
control of microorganisms, health hazards occur not only for the staff
directly involved with the cooling system - see this film
piece of the 3Sat series 'nano' first released 18.07.2014
about cooling system contamination.
solution: oxidative water treatment (AOP,
advanced oxidation processes)!
is a highly porous permanent filter granulate with an active
AOP-coating, which acts oxidizing and catalytic with all substances
entrained in the water.
AOP means that even solutes such as the heavy metals lead, copper and
zinc, as well as iron, manganese, arsenic, etc. are converted into
solids. In addition, all microorganisms such as bacteria, algae and
fungi, are eliminated by the strong oxidizing effect of the surface
coating. With a filtration fineness of 2-3 microns (compared to about
50 microns with filter sand), these impurities are filtered as well as
all other suspended matter, and very high filtration rates of 95-99%
are achieved over the entire pH range.
The oxidizing effect of the material is refreshed in each backwashing
by adding PROTABS OXY in the rinse water, thus remaining unspoiled
throughout the whole service life of the filter granulate.
Cooling water must be composed in such a way as to prevent interference
of heat transmission in the cooling aggregates by deposits (e.g. algae,
limescale, corrosion products).
The green way to clean circuit water:
operating costs of a cooling water circuit system mainly result from
The chemicals commonly used for stabilisation contain environmentally
harmful ingredients such as phosphonate, molybdate, chromate, nitrite,
orthophosphate, and are subject to regulatory observation because they
are forwarded into the wastewater with the periodical blowdown. If
these substances access the permitted daily load of dangerous
wastewater ingredients, the operator of the cooling system rapidly is
confronted with enormous extra costs. Furthermore, cooling systems by
now are considered as one main source of infections with legionella, a
genus of bacteria causing heavy pneumonia when inhaled.
something good for your environment, and save up to 30% operation costs!
The water in the sump of the cooling tower is pumped through
several times a day, thereby being cleaned of particulate matter and
turbidity, and bacteria carried with the water flow are destroyed.
Because the AOP technique in operation always removes metal ions too,
the corrosion velocity is lowered. Fresh water consumption and
wastewater volume are reduced, and less chemicals are required.
Together with the periodical backwashing of the filter, which cleans
and refreshes the FOM material, a blowdown of the system is carried out
(for display please set the mouse cursor above the illustration on the
right). By appliance of a bag filter, the pollutants are restrained
from reaching the sewage system, thus providing for compliance with
indirect discharge ordinance limits.
more good for your environment. Abolish environmentally harmful
chemicals and save up to 60% operation costs!
The fresh water used for filling up the system is lead through
a SCALIMEX scale protection filter,
which with its catalytic material takes forward the natural
crystallisation of water hardness. The micro crystals built on the
surface of the catalyst and released into the flowing water can be left
there without causing any trouble, because they can no longer build up
crusts and scalings on surfaces.
Additionally, the fresh water is treated with PROTABS Clean & Safe.
PROTABS C&S contain the latest and most advanced polymer
deposits and biological degradable Tolyltriazole as corrosion
inhibitor. Furthermore, it releases one of the best, fastestworking,
non-oxidizing bactericides that can even control microorganisms
existing in the pipelines, and completely decomposes during reaction
without leaving any residues.
This way, a common softener, salting the system with sodium, is made
redundant just as the use of environmentally harmful common biocides
and corrosion inhibitors.
detailed information on layout and dimensioning of FOM filters visit
our page Technical