(748e) Maximizing Inland Desalination Concentrate Recovery Using Electrodialysis Reversal

Bench and pilot testing confirmed the potential for the proposed process (ozonation, followed by biological filtration, followed by EDR with and without ion exchange softening) to reduce RO concentrate from reclaimed water RO concentrate by 79 to 91%. This reduction is achieved by removing organic compounds and reducing scaling potential. Organic compounds are removed by a two-step process where biodegradable organic compound is increased from 0 to ~20 mg/L by contact with ozone and then removed in a biological filter. Scaling potential is reduced by ion exchange softening. The proposed process reduces the evaporation pond size by up to 91% and improves the water reuse potential and salinity management for inland utilities.