Elgressy - Model EST -Cooling Tower Water Treatment System

Typically, hazardous chemicals are added to the cooling water to inhibit corrosion of system components, to retard mineral scaling and to limit bacteria growth.

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:

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.

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.

The remaining Magnesium ions in the water prevent corrosion along with controlled operation >2 MPY.

60% Water Blowdown reduction
100% Chemical reduction
80% Reduction in maintenance

• 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