This paper describes a water management study conducted in the arid southwestern U.S. to evaluate treatment options for a high salinity RO reject that is produced as a waste stream from high purity water production within an electronics facility. Increasing RO reject flows, coupled with a fixed volume within existing solar evaporation ponds for concentrate disposal, required the development of new approaches to reducing overall reject flows. Furthermore, water supply limitations required the treatment and reuse of the clean water recovered from the reject. Technologies considered in the development of reject treatment and reuse schemes for this study included precipitative softening using lime, caustic soda and soda ash followed by conventional and novel solids clarification processes; tubular and hollow fiber micro- and ultra-filtration, nanofiltration (NF), electrodialysis reversal (EDR) and various configurations of RO (brackish and seawater spiral wound, high efficiency RO [HERO?], and disc tube); thermally and electrically-driven evaporation; and passive and enhanced solar evaporation ponds.
This presentation is available to AMTA Members only.
- Jim C. Lozier, PE
- CH2M HILL, Inc.
- AMTA/AWWA Membrane Technology Conference, San Antonio, TX
- AMTA/AWWA Membrane Technology Conference
- concentrate, water reuse, reverse osmosis