Lenntech <!-- PLUGIN:LANGUAGE:water_treatment_and_purification --> Lenntech <!-- PLUGIN:LANGUAGE:water_treatment_and_purification -->

Seawater Desalination : Polishing Steps for Demi water production

Polishing Steps for Demi / Ultra pure Water


Ion exchange
Mixed Bed
Electrodyalisis (EDI)

Quality RO-water Demi-water Pure Water Ultra pure water
Conductivity 10-100 uS/cm 1-10 uS/cm 1-0.1 uS/cm 0.1-0.0555 uS/cm
Resistivity 0.1-0.01 MOhm 0.1-1 MOhm 1-10 MOhm 10-18 MOhm
Polishing step after 1st pass SWRO desalination process 2nd pass BWRO or SWRO (high temperature and salinity) 2nd-pass RO + strong Ion exchange resins 2nd-pass RO
+ strong Ion exchange resins + Mixed Bed resin
2nd-pass RO
+ strong Ion exchange resins
+ EDI or Mixed Bed Nuclear grade resin

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