Capacity
Resin capacity and regeneration interval should be calculated from actual ionic loading.
Industrial water treatment
Demineralisation (DM) Plant Design & Service
Cation, anion and mixed-bed demineralisation systems for applications that require low dissolved-ion and conductivity levels.
Engineering approach
Water chemistry drives resin selection
DM plant sizing and regeneration frequency depend on feed-water analysis, ionic load, silica, alkalinity, flow and the required treated-water conductivity. Resin condition and regeneration chemistry are key to reliable performance.
Process flow
Typical DM process flow
1Raw water
2Cation exchanger
3Degasser / intermediate stage
4Anion exchanger
5Mixed-bed polishing
6Low-conductivity product water
Design & operating considerations
Regeneration
Acid and caustic quantities, contact time and rinse sequence influence exhaustion and product quality.
Instrumentation
Conductivity and, where required, silica or other indicators should be monitored to detect breakthrough.
Pretreatment
Turbidity, iron, organics and hardness can shorten resin life if not properly controlled upstream.
Applications
- Boiler feedwater
- Process water
- Pharmaceutical utilities
- Electronics and high-purity processes
- Laboratory and utility systems
Support
Support includes resin evaluation, regeneration optimisation, conductivity troubleshooting and preventive maintenance.
Final equipment configuration, chemical dosing and operating targets should be based on actual water analysis, plant load and applicable discharge/process requirements.
Technical resource
Detailed engineering guide
The expanded DM manual covers ion-exchange chemistry, operating sequence, regeneration, resin care and troubleshooting.
Open technical guideFrequently asked questions
Why does DM outlet conductivity increase?
Typical causes include exhausted resin, incomplete regeneration, poor rinsing, channeling, flow problems or unsuitable pretreatment.
How often should DM resin be replaced?
There is no single interval. Resin life depends on feed quality, fouling, regeneration conditions, hydraulic loading and maintenance history.
Can a DM plant be designed from TDS alone?
TDS is useful but insufficient. Ion composition, alkalinity, silica, iron, organics and flow are important design inputs.