The purpose of this study was to determine the hardness and silica removal efficiency of conventional lime-soda ash softening of the primary RO concentrate using a novel high rate thickening softener. The softened effluent will be polished by dual media filters prior to a secondary RO treatment, and silica-tolerant electro-dialysis reversal (EDR) in synergy to recover more potable water from the existing RO plant. This study also evaluated solids handling processes that are suitable for lime sludge dewatering and disposal. The expected recovery of this treatment scheme is in the range of 90 to 95 %.
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- Winnie Shih, Ph.D.
- Carollo Engineers, Inc.
- AMTA Annual Meeting, Austin, TX
- California Prop-50 grant, EMWD, Concentrate treatment