Research on the Treatment of Secondary Effluent from Wastewater Treatment Plant by Electrocatalytic Oxidation
In order to determine the effect of electrochemical oxidation on the secondary effluent of urban sewage treatment plant,a batch reactor was used,and COD,ammonia nitrogen and total nitrogen were taken as the main indicators.The removal performance of Ti/RuO2 graphite and Ti/RuO2-IrO2 graphite electrode plates was compared,and the removal mechanism of ammonia nitrogen and COD was analyzed.The results show that when ammonia nitrogen is taken as the removal target,the optimal operating conditions for removing ammonia nitrogen are obtained by orthogonal experiment as follows:current density of 10 mA/cm2,pH = 6.0,plate spacing = 1.0 cm,chloride concentration of 2 000 mg/L,and reaction time of 50 min.More than 90%of ammonia nitrogen is removed in the form of nitrogen.The optimal operating conditions for COD removal are as follows:pH = 7.0,current density of 10 mA/cm2,plate spacing of 1.0 cm,chloride concentration of 1 500 mg/L and reaction time of 50 min.Under the optimized conditions,the removal rate of ammonia nitrogen and COD can reach 99.0%and 41.1%respectively.Three dimensional fluorescence analysis showed that the fluorescence intensity of organic matter in water decreased significantly.
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