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In this paper, COD Cr index was adopted as the test item, and the wastewater from the secondary sedimentation tank of a sewage treatment plant selected was treated by the method of "sodium hypochlorite oxidation - activated carbon adsorption - coagulation precipitation". The results showed that the removal rate of COD Cr reached 57.3% by the treatment of "sodium hypochlorite oxidation - activated carbon adsorption - coagulation precipitation". Therefore, this method can improve the removal rate of COD Cr , can make the wastewater discharging standard, and for the project provides data support to better treatment of industrial wastewater. Keywords Secondary settling tank; COD Cr ; Fenton oxidation; Sodium hypochlorite oxidation; Treat reach the standard DOI : 10.7176/CER/11-6-01 Publication date :July 31 st 2019

Study on Treatment of Secondary Sedimentation Wastewater by Sodium Hypochlorite Oxidation, Activated Carbon Adsorption and Coagulation Precipitation