| A
complete line of packaged systems is
available ranging from small, manually operated, to large, fully automatic systems with
remote control and data logging.
Since ozone is an unstable oxygen molecule that
cannot be stored or shipped, it must be generated on-site at the point of use. Problems
associated with the ordering, shipping, handling, storing, record logging, and effluent
disposal of standard water treatment chemicals are thus eliminated. The discharge water
from an ozonated cooling tower is guaranteed to comply with all current U.S. EPA
regulations.
Bacteria present in cooling tower water intensifies scaling by forming a bio-slime
layer that acts as a bonding agent for scale deposits. Because ozone is a very strong
biocide it destroys the bacteria, leaving the scale deposits free to be removed by the
velocity of the water through the pipeline.
Years ago, the chromate/zinc inhibitor was one of the best inhibitors on the market to
protect metal surfaces from corrosion in a cooling tower. Today, ozone is attaining the
same recognition by providing the same or better corrosion protection than the old
chromate/zinc inhibitor. Ozone provides a protective oxide coating on the metal surfaces
within the condenser loop.
Ozone reduces operating costs by:
- Reducing makeup water to the cooling tower by permitting
more cycles between blowdowns.
- Eliminating the cost and problems in ordering, shipping,
handling, storage, and disposal of regular chemicals.
- Reducing power consumption by keeping the chiller heat
transfer efficiency high through cleaner condenser tubes.
Ozone systems must be sized
individually.
Our
application
specialists
are
ready
to
review
and
utilize
your
existing
equipment
(such
as
aeration
towers,
pumps,
filters
and
buildings)
to
be
fitted
for
the
new
purpose.
In
order
to
do
so
most
efficiently,
please
complete
and
return
a
Project
Form
designed
for
your
project.
Manual and fully automatic systems are available. The
reason for selecting either one can be purely economical — usually, the breaking
point is 1,000 BTU tons.
A. MANUAL SYSTEMS
The manual systems require almost the same level of attention as the systems with
chemical feed. In manual systems OZONE simply replaces biocides, with the following
advantages:
- eliminates the use of chemicals except for pH balancing.
- ends discharge liabilities and chemical storage record
keeping.
- destroys all types of microorganisms.
- minimizes condenser fouling.
- decomposes organic waste by oxidation.
- prevents calcium carbonate scaling.
- removes existing calcium carbonate scale by destroying the
biomass glue bonding agent.
- reduces the corrosion rate of metals, including copper heat
exchangers.
- prevents delignification of wood frame towers.
- reduces water consumption by maintaining higher cycles of
concentration in the cooling tower.
- saves on energy costs by increasing the heat transfer
efficiency of the chiller.
The operation is easy:
1. Start with full ozone production to achieve the fastest initial cleanup.
2. When the water and all surfaces are clean, and all fallen scale has been removed,
read the corrosion coupons. If the corrosion rate is high, use a PDP or ORP test to
measure ozone residual. Record the corrosion, ozone residual, ambient temperature, pH,
into your logbook. Reduce the ozone production by 20%.
3. Repeat once a week, until you obtain a pattern that is characteristic for your
specific climatic conditions, cooling tower design, and makeup water characteristics.
Often the cooling towers already have automatic blow down installed — the new
ozone treatment will not interfere. Elevated ambient temperatures require more ozone. If
the tower was off-duty for a long time, or neglected, about one liter of hydrogen peroxide
will dramatically speed up the initial cleanup without adding any chemicals to the
discharge.
Manual systems are more suitable for towers of up to 1,000 tons BTU (3,500 gal/min),
where the additional cost of $10,000 to $17,000 US for a fully automatic system may not be
justified. As a result, the corrosion rate and number of cycles may not be as optimized as
with an automatic system — yet ozone will still provide the great advantages as
listed above.
B. AUTOMATIC SYSTEMS
In automatic systems the corrosion, dissolved ozone,
pH, conductivity, and AC current are measured in 0.5 second periods, and the ozone dosage
is adjusted automatically. Data logging is also automatic, and easy to access from any
telephone line via proprietary software. By precisely following the optimal pattern, the
corrosion rate is very low in the first year, and almost below detectable level in the
years following. The heat exchangers are usually 10 times more expensive than an automatic
ozone system of matching size.
The automatic system will extend the life span of the heat exchanger, and of other
metal surfaces, by at least a factor of 10. Usually the initial investment for an
ozonation system will return in just six months! A written report under a maintenance
program will be available to the end user, showing the actual prorated savings on monthly
bases. The phone line access also provides data for preventive maintenance, and security
purposes.
The automatic system also allows for a more accurate blow down. The discharge water is
very clean, and safe for accidental drinking.
C. MAKEUP WATER SYSTEMS
The makeup water should always meet the drinking water quality standards. In other
words, a cooling tower is not a dumpsite for sewer or otherwise bad water. Ozonation
systems are available to treat makeup water to drinking water quality standards. Ozone is
also very suitable to treat surface water sources. Surface waters are mostly very soft,
thus ideal for use in cooling towers. We will calculate the proper makeup system based on
your raw water test results.
O3 Water Systems' Application Specialists are ready to review your cooling
tower and utilize an ozone system for best efficiency.
In
order
to
do
so
most
efficiently,
please
complete
and
return
a
Project
Form
designed
for
your
project.
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