电化学氧化工艺对纳滤清液COD降解的研究

Research of the Electrochemical Oxidation on Degrading the COD of Nanofiltration Effluent

电化学氧化工艺在深度处理小分子有机污染物、降低出水COD方面有明显作用。分别探究了电流密度、电解时间对降低纳滤清液化学需氧量(COD)的影响。因直接氧化作用对有机物的断链、分解,高电流密度对COD的降解有更显著的作用,且在电流密度1000 A/m^(2)、进水COD为288 mg/L的前提下,通过控制电解时间,可使出水COD低于100 mg/L、60 mg/L。研究表明,该电化学氧化工艺在深度处理方面具有显著作用。但电解对总氮的含量无明显影响。同时,为了评判该电解工艺的经济性,计算了理论吨水电耗,其结果仅作为小试阶段的参考值。

Electrochemical oxidation plays a special role in disposing of the organic pollutant with lower molecular mass,achieving the decrease of the chemical oxygen demand(COD).In this paper,two primary factors,including the current density and electrolytic time,are researched carefully to reveal their role in the COD degradation of the nanofiltration effluent,respectively.Due to the chain scission of organic pollutant caused by the electric catalysis oxidation,high current density could obviously decreases the COD.Meanwhile,when the original COD is 288 mg/L,the degraded COD can reach to 100 mg/L or 60 mg/L by applying various electrolytic time.However,the electrocatalytic oxidation has barely impact on the total nitrogen content.Based on the experimental period,the power consumption is also calculated to reveal its economical efficiency,which only acts as the reference value.