The New Kermit H Lewin WTP will Improve Reliability, Resiliency, and Energy Efficiency for Lower Florida Keys

Agenda History Project Overview & Design Upgrades Reliability Environmental Resiliency Energy Efficiency Conclusions Robert Dean Water Treatment Facility, (FKAA) Florida City Delivers ~20-MGD of potable water to 77,000 customers In emergency situations, FKAA operates two Seawater RO plants Marathon Stock Island Marathon SWRO Stock Island SWRO History Kermit H Lewin Water Treatment Plant In 2004: Forced to replace membranes Proprietary membranes leave WTP vulnerable to pricing & availability risks Since 1997: New Building Codes → wind loads & impact related forces associated with a 200-mph wind speed New FEMA flood maps & County building standards Maintenance costs and significant downtime related to the diesel driven RO pumps Project Overview New Kermit H Lewin Water Treatment Plant FKAA has determined that the fortification & expansion of the KHL WTP is necessary Addresses multiple risks, including: Supply interruption caused by damage, failure, or leaks at either the main WTP or along the 180-miles of high-pressure pipe Contamination of groundwater supply near main WTP Severe drought or a major storm event Design Upgrades Reliable Environmental Energy Capacity & Resiliency Efficiency Equipment Reliable Equipment RO Membranes Existing membranes are hollow fiber membranes Continued use will result in drawbacks  Sensitive to pH  Single source supplier  Lower recovery rate Replace existing membranes with standard spiral wound membranes  Available from multiple suppliers Reliable Equipment RO Feed Pumps and Energy Recovery Replace existing pumps & turbines with high-efficiency axial piston pump and isobaric technology  Common for island-based seawater RO plants  HPPs sized to ROP flow  ERDs sized equal to ROC flow Credit: Danfoss Energy Efficiency Parameter Units Existing System New System Total Production Capacity MGD 2 Number of Trains No. 4 Total HP HP 2,860 2, Energy per MGD Capacity HP/MGD 1,430 4851 Specific Energy kWh/kgal 25.6 8. Note 1: Calculated using Danfoss iSave selection tool Energy Efficiency Energy required to produce 4-mgd of permeate using new technology is less than the energy required to generate 2-mgd using existing technology Specific energy consumption of the new system is ~33% of the existing system Significant increase in efficiency gained by employing state of the art membrane, pumping, and energy recovery technology Conclusions Compared to technology installed as part of the 1980 upgrades, the energy required to power the desalination process for the new WTP is reduced by ~66 percent by using high efficiency APPs and isobaric ERDs These upgrades will ensure that the KHL WTP will function as a reliable source of emergency water for the Lower Keys long into the future.