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Ozone Treatment for Cooling Towers

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Cooling towers are fabricated to cool water using evaporation method. These towers are used to remove the heat that is absorbed in the circulating cooling water systems. The cooling towers are mainly used in industries like oil refineries, chemical plants, power plants etc. However, there are some of the problems attached with the cooling tower system. These problems are:

Scale formation and silt accumulation in the system
Corrosion
Organic matter accumalation

In a well installed cooling tower's efficiency can be increased with the use of ozone. Ozone helps in reducing bacterial counts and also minimizes the buildup of biofilm on heat exchanger surfaces. This reduces lot of energy, and maintenance cost and also enhances the efficiency of the system. The ozone treatment does not require any chemical adjustments of the water. Ozone acts as a strong oxidizer, disinfectant, and prevents the building up of scale.

Components of cooling tower ozone treatment system
The components of cooling tower ozone treatment systems are:

Air dryer
Air compressor
Particle filter
Water and oil coalescing filters
Ozone generator
Ozone injectors
Monitoring/control system

Advantages
Following are the advantages of ozone water treatment in cooling towers:

The cost of maintenance the tower and the condenser unit is low.
The storage of chemical storage is eliminated.
Neither there will be algae growth nor there will be biofouling or biological slime.
Scaling on the condenser and the sheets is avoided.
The limited blowdowns result in major water savings.
Using precipitation, removes organic and inorganic material.
The rate of corrosion is reduced that increases the life of the equipments.

Conventional cooling water treatment vis a vis Ozonation
In Conventional water treatment of cooling towers, water is treated by using chemicals involving different types of metal compounds, organics, biocide, pH stabilizers, etc. The water, after few cycles are blown down. However the blown down water is of such a poor quality, that it cannot be recycled or recovered. This will also increase the operational costs. The chemicals on the other hand not only promote corrosion but is also unable to prevent biofilm and scale build-up. Though chemicals act as an effective biocides but the bacteria in the cooling tower develop immunity from this chemicals through mutation. Biofilmss that are created in chemically treated cooling towers also help in protecting bacteria.

However ozonation of the cooling tower results in the killing of bacteria faster as compared to conventional method. Moreover as opposite to conventional method ozonation also do not require any chemical adjustments of the water. Thus ozone acts as an effective disinfectant. They also prevent the growth of scaling and biofilms. Biofouling which is a major problem of the chemical method is absent in ozonation technique. Using ozonation technique the intervals between blowdown is also increased because the cycle time is increased in this method. Moreover, the concentrated chemical residue in the blowdown water is absent that can be easily discharged in the sewer.

Tags:- Cooling Tower Ozone Treatment System, Cooling Towers Ozone Treatment For Wastewater

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