Ozone In Cooling Tower, Mumbai, India
 
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Application of Ozone in Cooling tower :

 
     
  Ozone as a cooling tower biocide is not only environmentally benign, it also brings a significant number of other benefits.  
     
 

The circulating water of cooling tower systems has always been an ideal place for growth of microorganisms. The warm temperature of the water and the addition of nutrients from the scrubbed air flowing through the tower provide a virtual nirvana for all sorts of microbes and algae. In turn, these organisms multiply at fantastic rates. The result is degraded system efficiency due to blockage of flow, shortened equipment life due to corrosion, increased operating cost due to higher pumping power requirements, and the spread of disease or even death.

Ozone as a cooling tower biocide offers a means to this end. It is not only environmentally benign, but ozone use also brings a significant number of other benefits to the cooling tower system operator. Ozone is a practical oxidizing biocide because it is the fastest acting and the most efficient oxidizing agent against all microbiological organisms - when properly applied, ozone will kill all viruses, bacterium, cysts, and algal species. And, any ozone not consumed as a biocide naturally decays to oxygen, making ozonation the preferred choice for biological control of many cooling tower systems.

Field tests have demonstrated that the use of ozone in place of chemical treatment can reduce the need for blowdown, and, in some cases where make-up water and ambient air are relatively clean, can eliminate it. As a result, cost savings accrue from decreased chemical and water use requirements and from a reduction of wastewater volume. There are also environmental benefits as fewer chlorine or chlorinated compounds and other chemicals are discharged. There is also a belief within the industry (and some evidence) that under certain conditions ozone acts as a descaling agent. The premise is that ozone oxidizes the biofilm that serves as a binding agent adhering scale to heat exchange surfaces. When scale buildup on condenser tubes is reduced, higher heat transfer rates are achieved. Increasing the condenser heat transfer rate will reduce the chiller head pressure, which then allows the chiller to operate more efficiently and consume less energy.

Biological growth, scaling, and corrosion are the main maintenance concerns with these cooling towers.

 

Cooling Tower

 
     
 

BENEFITS OF OZONE OVER CONVENTIONAL METHOD

 
     
 
  • Will not load any substance in water unlike chlorine which builds up the TDS till the cooling power is lost.
  • Virtually eliminate the necessity for the blow down.
  • Saves you from the 'who-pollutes-pay tax' which is becoming standard world wide (people are made to pay according to the load they dump even in the permitted drains)
  • Makes the water crystal clear, eliminating all turbidity.
  • Removes all bacteriae, including the dreaded 'Legionella'.
  • Costs almost nothing, once installed. Just a little power…
  • Dissolves the scale and inhibits further scaling, hence improving heat transfer and further saving on chemicals and pollution.
  • Decreases the corrosion by 50% (acts by passivation like chromates which are used as corrosion inhibitors, but dangerous)
  • Removes froth  and  does not generate further froth.
  • Brings the bacteriae count down to below 1000CFU/ml compared to 105 to 107 for chlorine
  • Makes you free from the suppliers of chemicals and maintenance personal as well.
  • Reduced Chemical Usage – Chlorine can substitute for several chemicals in a cooling tower treatment package, reducing and possibly eliminating the use of such chemicals...
  • Increases dramatically Heat Transfer Efficiency.
  • Repays for its capital cost in 6 to 18 months.
  • After this, it adds good money to the bottom line of your clients, balance sheet. . . and yours by their repeated orders.
 
     
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