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Chemical Oxygen Demand (COD) Reduction of Pharmaceutical Wastewater by Chemical Coagulation and Electro-Fenton Oxidation Process

Shima Goodarzi*, Shams Khorramabadi, Mohammad Amin Karami

The pharmaceutical wastewater mostly contains high levels of organic matter. In order to produce a suitable wastewater for discharge into the municipal sewage, chemical and electrochemical methods, have been studied. The aim of this study was to evaluate the efficiency of chemical coagulation/Electro Fenton combination process in COD reduction of pharmaceutical wastewater. The effect of PAC (aluminum chloride) concentration 25-300 mg/L and pH of 3-7-10 were investigated. The effluent of chemical coagulation stage was transferred to the Electro Fenton stage. Also the effect of H₂O₂ concentration 100 - 4000 mg/L, contact time of 15-120 min, voltage of 10-30 v and pH of 3-7-10 were investigated. The results showed that the highest removal rate COD was 93.5% in the optimal conditions at coagulant dose 200 mg/L and pH of 7 for the coagulation process, and at concentration of 100 mg/L 100 hydrogen peroxide, the voltage of 20, pH of 3 and contact time of 30 minutes for the Electro Fenton process. The results showed that chemical and electrochemical processes are effective methods for treatment of pharmaceutical wastewater. It is generally concluded that combined of processes are more effective than coagulation process alone in removal organic compounds from pharmaceutical wastewater.