The Collier County North County Regional Water Treatment Plant (NCRWTP) is a 20-mgd facility including a 12-mgd nanofiltration (NF) system and an 8-mgd brackish water reverse osmosis (BWRO) system. The existing BWRO system treats the Upper Floridan Aquifer Wells. Soon after the RO system installation in 1999, four of the new Floridan wells were discovered to produce high salinity, 20,000 mg/L total dissolved solids (TDS), while the remaining wells produced 3,000 to 4,000 mg/L TDS. The high salinity wells have remained out of service despite their high capacity and represent millions of dollars of infrastructure that is currently sitting dormant. The County therefore began exploring additional treatment options to use these wells and initiated a variable TDS study to determine the most cost-effective way to treat the current 4,000 mg/L average RO feed TDS to the maximum 20,000 mg/L TDS of the high-salinity wells. The variable TDS study started with a condition assessment of the existing BWRO system and then developed multiple treatment options that could meet the County’s goals with minimal impact to operations. Primary options included modifying the existing RO trains and installing new high-TDS conventional RO trains. The study created high level design criteria for feasible options that was used in developing comparative costing including understanding the cost sensitivity of adjusting the feed TDS range.
This presentation is available to AMTA Members only.
- Yue Hu
- AMTA/AWWA Membrane Technology Conference, West Palm Beach, FL
- AMTA/AWWA Membrane Technology Conference
- NF, BWRO, RO