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Reverse osmosis plant have at their heart a membrane that if damaged reduces output, increases costs and gives poor water quality so it is important to keep it clean and operating efficiently.
Most reverse osmosis membranes are formed from hollow fibre or thin film composite sheets with the membrane allowing passage of pure water and rejecting the dissolved solids contained in the water.
As water passes along the membrane surface the solids concentration increases and some sparingly soluble salts start to exceed their solubility and precipitate. When precipitated onto the membrane surface this causes fouling that may reduce output and increase product water conductivity. The worst of these solids being calcium carbonate and calcium sulphate and so the prevention of their precipitation is vital if the membrane is to function efficiently.
The traditional way to prevent this was to "de-alkalise" the water using sulphuric acid to prevent calcium carbonate precipitation. However the acid is hazardous increases the sulphates and increases the corrosivity of the water on both sides of the membrane. Reducing the recovery rate of the reverse osmosis plant eliminated calcium sulphate but this reduces the efficiency of the plant and hence increases costs.
THERMOCHEM CORPORATION PVT LTD