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Reduction of Chemical Oxygen Demand of Industrial Reverse Osmosis (RO) Reject Water by Hydrogen Peroxide Treatment

Akhil Chandra Kar


Reverse osmosis (RO) technology is now applied in many industrial water treatment processes for producing low saline water which are required for demineralized water production for boiler operation of thermal power generation plant, metallurgy and many others. The RO reject water having high salinity are mostly rich in sodium, potassium, calcium, magnesium, and other metal salts of chloride, sulphate, sulphite, nitrate, nitrite, silica (SiO2), carbonate, bicarbonate, hydroxide and many other trace metal salts which contribute to high chemical oxygen demand (COD). The RO reject water could not be discharged directly to river or sea due to high COD as it would be fatal for aquatic organisms and create a threat for their existence and also rupture the ecological balances. This research work shows that the high COD value of RO reject water can be reduced up to the required limit by treatment of hydrogen peroxide (H2O2) in the RO reject water discharge line. The high COD value can be controlled up to the required limit as per environmental legislation by optimum dosing of H2O2 which is safe for aquatic species.



Chemical oxygen demand (COD), reverse osmosis (RO), hydrogen peroxide (H2O2), aquatic organisms

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