Cooling Towers Treatment – EST
EST electrochemical systems are revolutionizing cooling tower
treatment by providing a omprehensive and effective treatment against scaling, corrosion and bio-fouling.
Typically, hazardous chemicals are added to the cooling water to inhibit corrosion of system
components, to retard mineral scaling and to limit bacteria growth.
Corrosion
Scale
Bio-fouling
Corrosion
Scale
Bio-fouling
How does it work?
The EST system connects to the cooling tower basin and circulates water therein. A controlled constant DC current
is applied to the patented titanium nickel oxide anodes, generating the following efects:
Disinfection:
1. An alkaline environment of pH 13 is created next to the
reaction tank’s inner walls creating a strong disinfectant.
2. Near the anodes, 3-7% of the naturally present chlorides
are converted to free chlorine or hypochlorite (OCl-).
The OCl- level is programmable to automatically remain
at ~0.1-0.2ppm, providing additional disinfection
without the risk of corrosion.
3. Additionally, disinfecting radical oxygen, ozone and hydrogen peroxide are produced near the anode.
Scale removal:
The electrical current causes a dissociation of the salts in the water into ions, precipitating the calcium (and other cations) on the reaction tank wall. The EST is capable of precipitating > 30% calcium from the water before it crystallizes into scale, while the remaining calcium is kept
dissolved in the water.
The calcium precipitation percentage is programmable, automated and varies from
project to project.
The EST patented scraper system automatically scrapes and flushes the reaction tank to remove the precipitated scale.
Corrosion control:
The remaining Magnesium ions in the water prevent corrosion
along with controlled operation >2 MPY.
Advantages:
- Cost effective - rapid return of investment
- Solves cooling tower problems stemming from algae, corrosion and scaling
- Reduces maintenance, shut down time and labor cost
- Generates huge water savings
- Chemical free solution –eliminates the need for expensive and harmful chemicals
- Very low life cycle cost and electricity consumption
- Controllable and measurable ensuring consistent quality water
- Small footprint
- Robust and high-quality equipment with few moving parts
- Modular and simple to install or retrofit
- Proven effective in thousands of installations worldwide.
- Environmentally friendly
