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Ion exchange systems

Ion Exchange Systems

To produce pure boiler feedwater, alternatively to a reverse osmosis (RO) system, an ion exchange system can be used comprising of cation and anion vessels and a mixed bed for final polishing. Steel pressure vessels filled with ion exchanger resins absorb all salt components (cations and anions) from the feed water. The ion exchanger resins need to be regenerated using strong acidic and caustic solutions.

Keyfacts Application


Production of pure boiler feedwater


2 Applications (1. Conductivity after Cation Exchanger, 2. Conductivity after Anion Exchanger)

Measured Parameter


Key Requirements

Measuring in low pH and neutral pH water

Measuring in Cation free and demineralized Water

Application Description

Specific conductivity and cation conductivity needs to be measured after each vessel. To reduce overall cost and downtime for regeneration, these measurements are mandatory to run the system effectively.

Requirements of Application

Amount of chemicals used and production of wastewater can be minimized by optimized control.

Why Knick?
Knick’s conductivity sensor SE604, recommended for this application, is the only sensor with removable outer electrodes for easy cleaning and handling. SI/SF (System Integrators/System Fabricators) and plant manufacturers appreciate our reliable, sophisticated and accurate solutions.

Matching Products

Related Industries and Applications

In power plants, water is used in many processes with completely different requirements, e.g. for steam generation, cooling and flue gas cleaning.
Measuring of pH, dissolved oxygen and conductivity as the essential parameters in boiler feed water circuits. The challenge of this application is the low ion concentration.
Cooling towers are used in a range of industrial sectors for diverting process heat from cooling circuits. Mineral deposits and corrosion reduce efficiency and lead to the premature wear of system components.
Since steam generator functions are critical to applications and their downtime or replacement is extremely cost intensive, it is important to avoid damage due to wear...
Measuring of pH in pre-Scrubber, in neutralization and in lime scrubber within the flue gas desulfurization process in power plants.
Measuring of pH, dissolved oxygen and conductivity in boiler feed water, steam and condensate in combined cycle gas turbine in power plants.
Measuring of pH, dissolved oxygen and ORP in different applications while Water Treatment process of Power Plants’ Wastewater.
Reverse osmosis systems are used in a wide range of industrial applications for water treatment. The main application is industrial seawater desalination.

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