Ti/SnO_2-Sb阳极-空气阴极电催化降解染料废水

为解决电化学法处理高盐染料废水存在的能耗大、成本高等问题,分别采用溶胶-凝胶法和辊压法制备Ti/SnO_2-Sb阳极和空气阴极,构建了Ti/SnO_2-Sb阳极-空气阴极双极体系(TSSA-ADC)。甲基橙(MO)作为高盐染料废水的典型污染物,考察了电流强度、MO浓度、电解液浓度和初始p H对TSSA-ADC体系和TSSA单阳极体系降解MO的影响。结果表明:与TSSA单阳极体系相比,TSSA-ADC体系具有更好的抗有机负荷冲击、抗盐分冲击、抗酸碱波动能力,能够维护酸碱平衡防止硬度离子结垢。最佳反应条件为电流强度为0.030 A,电解液浓度为3%,MO浓度为100 mg/L,初始pH=6。以MO去除率达到98%为基准,TSSA-ADC体系比TSSA体系可节能74.26%。

TREATMENT OF COMPREHENSIVE WASTEWATER FROM PRINTED CIRCUIT BOARD BY IRON CARBON CATALYTIC INTERNAL ELECTROLYSIS COMBINED WITH A/O PROCESS

According to the characteristics of low pH,high content of Cu,Ni and ammonia nitrogen of printed circuit board integrated wastewater,the wastewater treatment was carried out by using iron carbon catalytic internal electrolysis combined with A/O process.Under the optimum conditions,the removal rate of total copper in the first stage catalytic internal electrolysis was 99.6％,which reduced from 179.7mg/L to 0.71 mg/L,and the removal rate of total nickel was 62.7％,which reduced from 0.83 mg/L to 0.31 mg/L.The removal rate of total copper in the second stage catalytic internal electrolysis was 96.3％,which reduced to 0.026 mg/L,and the removal rate of total nickel was 92.6％,which reduced to 0.023 mg/L.The removal rate of COD and TP of two stage iron carbon internal electrolysis was 53.3％ and 91.2％.The final effluent after the A/O system treatment was:ρ (COD) ＜ 44 mg/L,ρ (TP) ＜ 0.21 mg/L,ρ (TN) ＜ 14 mg/L,ρ (NH4+-N)＜ 1.6 mg/L,ρ(total copper) ＜ 0.02 mg/L,ρ(total nickel) ＜ 0.016 mg/L,meeting the firststandard of GB 18918-2002"Discharge of Pollutants for Municipal Wastewater Treatment Plant".