In the prevention and control of
legionnaires disease (legionella) causing microbes, ozone has taken an
eminent roll. The specific characteristics of the disinfectant make sure
ozone gets the job done where others fail.
Biofilm in the piping can
protect legionella from most of the disinfectants.
solution for this problem is the use of ozone disinfection for
new and existing cooling towers.
A biofilm is a layer of
microorganisms contained in a matrix (slime layer), which forms on surfaces
in contact with water. Incorporation of pathogens in biofilms can protect
the pathogens from concentrations of biocides that would otherwise kill or
inhibit those organisms freely suspended in water.
Biofilms provide a safe haven for
organisms like listeria, E. coli and legionella where they can reproduce to
levels where contamination of products passing through that water becomes
||Heat exchanger fouling with conventional biocide treatment program
||Heat exchanger after switching to ozone treatment
Attn: Government of Canada does not recognize the fact that ozone destroys all bacteria, viruses, etc. and could be used as a sole disinfectant in swimming pools, cooling towers and similar water treatment applications.
Therefore any claims on this website about ozone disinfecting properties cannot be used or be accepted in any such applications in Canada.
Use of ozone as a sole disinfectant for bottling water and food disinfection purposes is allowed in Canada and is approved by Canadian Health Agencies.
Evaporative water cooling towers for power generation, industrial,
refrigeration and HVAC markets throughout the world.
We also focus on cooling
tower water treatment, because - amongst other bacteria - Legionella
is still a problem in cooling towers.
Ozone in cooling
Ozone is a strong disinfectant and an interesting alternative for the
chemical biocides in cooling tower water treatment. The use of ozone in
cooling towers has some great advantages. Ozone also has its
limitations, which when kept in mind during the design phase, should not
The advantages of
Safe and easy in use
produced on-site and requires no storage of dangerous chemicals
Ozone requires no additional disinfectants
cocktail of disinfectants necessary. Micro-organism can not get
resistant to ozone after prolonged use of ozone
High efficiency as disinfectant. A residual ozone concentration of 0.1
to 0.2 ppm is in most cases very effective in keeping the cooling
tower and the cooling circuit clean.
Very effective in removing biofilms
Higher efficiency of heat exchangers due to reduced biofilm formation
to good biofilm
removal capacities very effective against
chlorinated compounds. Very low corrosion rates in the system.
persistent chemicals or disinfectants in bleed. Ozone breaks down to
some cases ozone can replace disinfectants and also dispergents and
many cases a higher concentration factor is possible
Lower operational costs and in many cases a lower overall costs
Ozone is effective in a wide pH range
Also effective for mussel growth
In the design of a
proper ozone disinfected
cooling tower, one needs to take care of the following points
Suppletion water with high hardness and / or high COD levels is less
suitable for ozone based cooling towers
Retention time in the system. The half time of ozone is normally less
than 10 minutes in cooling systems. To assure an adequate residual
ozone concentration it is necessary to start with an adequate begin
Dead spots. Because
ozone depletes to oxygen, spots with little circulation have to be
Temperature. The solubility of ozone and the half life time of ozone
decreases at higher temperatures. This limits the temperature of the
cooling water in which ozone can be used. This limit is in most cases
around the 45°C.
materials used in the cooling tower need to be ozone resistant.
Contact us at Office@AbsoluteOzone.com
for Cooling Tower Ozone Injection schematic