电极材料对双池电化学降解靛蓝废水的影响

Effect of different electrode materials on electrochemical degradation of indigo wastewater in double cell

为探讨电极材料对双池电化学降解靛蓝废水的影响,选取不锈钢和石墨作为阴/阳极电极材料,分析FeCl_3和NaCl质量浓度、电解时间和电压对脱色率的影响。测量了在最佳脱色效率条件下COD和BOD值,评价废水可生化性。结果表明,采用阳极区单独对废水进行降解,阴/阳电极材料同为不锈钢时脱色效率最好,脱色率达到99.01%,COD去除率为63.40%,B/C值为2.7。极差分析表明,NaCl质量浓度对脱色影响最为显著;采用阴/阳极区同时进行降解,阴极电极为不锈钢、阳极电极为石墨时,脱色效率最佳,脱色率为98.71%,阳极废水COD去除率为57.41%,B/C值为2.7,阴极区废水COD去除率为88.81%,B/C值高达7.1。FeCl_3质量浓度对阴极废水脱色影响最为显著,电压对阳极区废水脱色影响更显著。

In order to investigate the effect of electrode materials on the electrochemical degradation of indigo wastewater by double cell, stainless steel and graphite are selected as the electrode materials, respectively. The orthogonal experiments are designed to explore the concentrations of FeCh and NaCl, electrolysis time and voltage on decolorization rate. The decolorization efficiency and the effect of each factor are analyzed by means of mean and range, and the COD and BOD values are measured under the optimal decolorization efficiency to evaluate the biodegradability of wastewater. The results show that the wastewater is degraded in the anode zone with stain less steel as the cathode anode electrode material, the decolorization efficiency is the best, reaching 99.01%, the COD removal rate is 63.40%, and the B/C value is 2.7. Range analysis shows that NaCl concentration has the most significant effect on decolorization. When the wastewater is degraded in both the cathode and anode zone at the same time, stainless steel as the cathode electrode and graphite as the anode electrode, the decolorization efficiency is the best, which is 98.71%. The COD removal rate of the anode wastewater is 57.41%, and the B/C value is 2.7, and the values for the cathode are 88.81% and 7.1, respectively. The range analysis indicates that FeCh concentration has the most significant effect on the decolorization of cathode wastewater, while the effect of voltage on the decolorization of anode wastewater is more significant.