Reducing silica scale on membranes at desalination plants SILICA SCALING ON MEMBRANES IS A MAJOR PROBLEM WHEN WATER HAS HIGH SILICA CONCENTRATION. CHALLENGE: FLUX DECLINE, INCREASE IN PRESSURE DROP AND SALT PASSAGE Silica scaling on membranes used in the desalination process is a major problem if water that passes through a desalination plant has high silica concentration. Scaling causes a flux decline and increases pressure difference and salt passage. Silica scaling happens when the concentration of dissolved silica exceeds the solubility limit at the temperature and pH of solution. This is a major problem at Reverse Osmosis plants where silica concentration in feed water is at elevated range (e.g. 25 ppm) and recovery is high (e.g. more than 80%). At these levels, the silica in con

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