COD REDUCTION OF PHARMACEUTICAL INDUSTRY WASTE WATER BY ELECTRO OXIDATION PROCESS BY GENERATION OF IN SITU HYPOCHLOROUS ACID

Environmental Engineering

In this present work, to reduction of Chemical Oxygen Demand (COD) is measured by electrochemical oxidation treatment of pharmaceutical waste water which was collect after primary treatment. The influence of the critical parameters of electro-oxidation such as pH (7 to 8.5), Time period (0min to 90 min), Salt concentration (5gm/L to 20 gm/L) and Current voltage (3V to 12V) on the reduction of COD was studied using different electrode. In this treatment process, in-situ production of hypochlorous acid was achieved by the use of sodium chloride solution for chlorine production. The hypochlorous acid was utilized for the oxidation of organic matter present in the wastewater. It was used graphite, iron and copper electrodes with dimension of (5cm x 20cm x 1mm) using a glass reactor with an optimum capacity of 7 L. The electrodes were arranged parallel to each other. The distance between the two electrodes kept 3cm. The maximum reduction of chemical oxygen demand was carried out at high current voltage, high salt concentration of Nacl. The maximum COD was 68.26% at 7 pH , 30 mg/L Nacl concentration, 12V applied voltage and an electrolysis time period of 90 min.

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