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KWR – Towards Zero Liquid Discharge

Last updated 989 days ago by Albert Verver


NL GUTS Group of Users of Technology for Separation in the Netherlands


20131203 KWR Water Recycle Research Institute – Mrs. Sara Salvador Cob – Towards Zero Liquid Discharge by Combining Crystallization, Ion Exchange, Nanofiltration and Reverse Osmosis

KWR develops a process for ZLD at a high water recovery rate from different (waste)water sources. The process entails cation exchange to reduce scaling potential on NF and RO, NF to increase the recovery of RO at acceptable permeability.

Silica precipitation on the membranes was resolved. The ion exchange regenerate and the RO concentrate (2% of feed flow) were further concentrated with Eutectic Freeze Crystallization, including several washing steps, generating a very pure water stream and good quality NaCl and NaHCO3 salts. The total result is 99,9% water recovery and 0,1% waste. www.kwrwater.nl


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