According to the invention there is provided a
tertiary effluent treatment process for reducing the
phosphate levels in
effluent. The process comprises the steps of delivering
effluent from a
wastewater treatment
plant to a primary filter, delivering the filtered effluent to a series of two or more
phosphate removal filters, delivering the filtered
phosphate-depleted effluent to a
treated water tank as
treated water, delivering the filtered phosphate-depleted effluent from the
treated water tank to a
discharge tank as treated water; and, discharging the treated water from the
discharge tank as required. Each phosphate removal filter comprises a plurality of
polymer-based beads having nano-particles of
iron oxide coated thereon. The
advantage of using a series of two or more phosphate removal filters is that the process can deliver a final effluent containing specific pre-determined levels of phosphate that may be as low as 0.01 mg / L of effluent, but will in all cases be below 1 mg / L. The series of two or more filters also allow the process to accommodate variations in the phosphate content of the effluent without affecting the level of phosphate in the
discharge, and, the
system can be retro-fit to the end of any type of existing
waste water treatment plant or can be integrated into a new facility.