Cooling Tower

Ozone Use In Cooling Tower Water Treatment


The use of ozone in cooling tower treatment has received a vast amount of attention in recent years. 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 products have failed. There are other specific characteristics that give ozone a great amount of appeal to cooling tower users.  

They include:

  • Reduced On-Site Chemical Inventory
  • Tying your operation to a chemical supply chain
  • Ozone is a GREEN product with little or no toxic discharge
  • The conservation of water

 Ozone Benefits for Cooling Towers

  • Safe and easy in use
  • Effective for mussel growth
  • Very effective in removing biofilms
  • Ozone is effective in a wide pH range
  • Destroys all types of micro-organisms instantly
  • Ozone decomposes organic waste through oxidation
  • Ozone is 3,125 times more germicidal than chlorine
  • Reduced permit costs for discharge of treated water to environment
  • Environmentally friendly treatment, facilitating regulatory compliance
  • Very effective against Legionella, due to good biofilm removal capacities
  • Ozone requires no additional disinfectants, micro-organisms cannot get resistant to ozone after prolonged use of ozone
  • Low corrosion rates in the system. Reduces the corrosion rate of metals, including copper heat exchangers, because there are no chlorinated compounds
  • Disinfectant with a high efficiency level (a residual ozone concentration of 0.1 to 0.2t ppm is, in most cases, very effective to keep the cooling tower and the cooling circuit clean)
  • Insignificant buildup of disinfectant or disinfectant byproducts. Ozone does not leave any chemical residues or disinfectants, at the end of its cycle, ozone decomposes again into oxygen

Operational Savings

The use of an ozone system in free cooling towers entails 
in addition to the benefits comprising, represent
significant savings to the levels of:
  • Reduction of water consumption
  • Reduction of consumables
  • Reduction of anti-scaling and anti-corrosion agents
  • Reduced maintenance costs
  • Remove the costs of chemical biocides storage and transport
  • Reduction of energy consumption due to the increased efficiency of the cooling operation

yearly-ozone-savings.pngAccording to a study carried out by the U.S. Department of Energy Federal Technology Alert at the Lockheed Martin Facility’s premises, in Florida, where they compared the operating costs of cooling towers with the traditional (chemical) system and with ozone treatment, we can conclude that annual costs are reduced by one-quarter of the initial value. This represents a reduction from $ 198,168 to $ 57,415 per year, two values that stand out are relative to the operational costs (labor) and the costs with the power consumption.

We were unable to maintain adequate biological control in the small cooling tower at our remote, unmanned power generating facility. We needed a treatment system that could operate daily and reliably to treat the water without any manual over-site. Something that posed minimal dangers to the plant of the environment and had adequate fail-safes built into it. We had reservations about ozone being sufficient to control the bio-fowling, and yet not be corrosive to the system.

The fact that we provided the option to rent or "rent-to-buy" the ozone treatment system allowed us to try it with less risk. Ozone treatment on a daily basis has accomplished more consistently acceptable bacteria counts than any of the other "non-ozone" treated towers.

Read more about Ozone and Water Treatment

Scientific Publications
 Gas Ozone
The Use of Ozone in Cooling Towers
Use of Ozone for Cooling Towers
Performance assessment of oxidants as a biocide for biofouling control in industrial seawater cooling towers
Ozone Treatment for Cooling Towers
Economical Calculations for the use of Ozone in Cooling Towers
Effective and Efficient Ozone Use on Cooling Water Towers
Advances in Water Treatment for Cooling Towers