McKim & Creed provided preliminary design, geotechnical investigations, subsurface utility engineering (SUE) locates, surveying, preliminary design, final design, permitting, programming, and construction phase services for this zero liquid discharge (ZLD) project. The City of Palm Coast owns and operates Water Treatment Plant No. 2 which has a permitted capacity of 6.384 MGD. The plant is classified as a membrane softening facility where nanofiltration membranes are used primarily to reduce hardness. The dissolved solids that are removed by the nanofiltration membranes are consolidated into a process stream called concentrate. The City had selected ZLD as a concentrate management alternative for WTP No. 2 which provides for recovery of concentrate along with beneficial reuse of solids removed from the concentrate stream.
Overall the project: 1) Brings the city into regulatory compliance by eliminating the use of an extended mixing zone, 2) Meets the city’s green initiative goals for water conservation and waste recovery and 3) Produces high-quality drinking water that meets US Environmental Protection Agency and Florida Department of Environmental Protection primary and secondary standards as well as city water quality goals.