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PWNT SIX - Suspended Ion Exchange for Organics Removal
SIX® is a suspended ion exchange process, developed by PWNT as an alternative to coagulation for organics removal. It is suitable for treating surface waters to remove dissolved organics. The system uses an efficient resin contacting, separation and regeneration system, with brine used up to five times which helps reduce waste streams.
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- Efficient removal of organics (60-90%)
- High UV transmission achieved (>90%)
- No iron or aluminium based sludge
- Compatibility with a variety of commercially-available resins to achieve a wide range of required water quality
targets, allowing flexibility to meet different conditions - Very minimal chemical requirement – the only major chemical requirement is salt (sodium chloride) for regeneration
- Resin is recycled with low resin attrition and loss, thus low additional resin is needed over time
- Short resin contact times, implying no risk of resin blinding and biofouling
- Full-scale resin service life > five years
- Other anions, such as sulfate and nitrate, are also removed
- Possible regeneration with sodium bicarbonate