Recovery of RO Membrane Performance through Direct Osmosis-High Salinity Membrane Cleaning Process
By Harold Standfield et al.
The water treatment plant at Ameren Energy Resourcesﾒ Newton Energy Center was constructed and commissioned in 1997. The plant consists of membrane filtration (MF) followed by reverse osmosis (RO) treatment. The overall system is designed to provide the power plant with up to 300 gallons per minute (gpm) of high-purity water for use in the steam generator/turbine systems. The overall quality specification from the water treatment plant is for the purified water to have a minimum resistivity of >17 megohm-cm, with dissolved silica and sodium concentration <5 parts per billion (ppb) (micrograms per liter [ﾵg/L]). The water plant treats raw water from Newton Lake, a manmade cooling water lake. The lake water has low salinity, about 200 parts per million (ppm) (milligrams per liter [mg/L]) of total dissolved solids (TDS), total hardness of 90 ppm (mg/L), alkalinity of 80 ppm (mg/L), and dissolved silica below 2 ppm (mg/L). The raw water periodically contains around 4 ppm (mg/L) of dissolved total organic carbon (TOC), and 15 ppm (mg/L) of total suspended solids (TSS).
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