Cooling Tower Water Treatment

A cooling tower concentrates whatever is in its make-up water. As water evaporates, hardness, silica, chloride and sulphate climb with every cycle of concentration; warm, aerated, nutrient-rich water is also the ideal home for algae, bacteria and Legionella. Left alone, the result is scale on condenser tubes (a 1 mm calcium carbonate layer can cut heat transfer by 10 % or more), corrosion of carbon steel and copper alloys, biofilm that insulates and corrodes, and fouling that blocks fill and nozzles.

Cooling water treatment is the combination of make-up water quality, mechanical filtration, chemical dosing and blowdown control that keeps the system clean at the lowest total cost of water, chemicals and energy. We design it as a system, not as a chemical programme sold by the drum.

1. Make-up water treatmentSoftening, RO or partial RO on make-up raises achievable cycles of concentration and cuts blowdown; iron and silica removal where the source demands.
2. Side-stream filtrationAutomatic multimedia, sand or screen filters treating 3–10 % of recirculation flow continuously — removes airborne dust, corrosion products and biological debris.
3. Scale and corrosion controlPhosphonate, polymer and azole inhibitor programmes dosed proportionally to make-up or blowdown, with pH control where required.
4. Microbiological controlOxidising biocide (chlorine, bromine, chlorine dioxide) on a controlled ORP or timer basis, with non-oxidising biocide shots; Legionella risk assessment and monitoring.
5. Cycles of concentration controlConductivity-based automatic blowdown holds the sweet spot between water waste and scaling risk.
6. Blowdown treatment and recoveryRO or softening on blowdown returns 60–80 % as make-up; reject to ETP or ZLD where discharge is restricted.
7. Monitoring and automationOnline conductivity, pH, ORP, corrosion coupons or probes, flow-proportional dosing, remote alarms and monthly reports.

Process industries

Pharma, chemical, textile and food plants with evaporative cooling for reactors, chillers and compressors.

Power and captive generation

Condenser cooling for thermal and captive power; high-cycles operation with make-up RO.

Data centres and commercial HVAC

Chiller condenser water with strict uptime, Legionella control and water-efficiency targets — see our dedicated data centre water treatment page.

Refineries and petrochemicals

Large open recirculating systems with hydrocarbon leak risk and high corrosion stakes.

Steel, cement and metals

Direct and indirect cooling with high suspended solids; heavy side-stream filtration.

Water audit — make-up analysis, system volume, heat load, current cycles and chemical spend → treatment design and water balance → supply of filtration, dosing and RO skids → commissioning and programme setup → monthly O&M with reports. We also take over and optimise cooling systems already under another vendor's programme.