电化学氧化耦合铁感应电极激发过硫酸盐氧化处理焦化废水生化出水

Electrochemical oxidation coupling iron plate induction electrode excited persulfate oxidation treatment of coking wastewater biochemical water

采用电化学氧化(EC)耦合铁(IP)感应电极激发过硫酸盐(KPS)氧化处理焦化废水生化出水,在反应器阴、阳极之间等距离嵌入铁板构建电化学双电解反应体系.该体系中,铁板作为感应电极,充当阳极材料的同时兼具有阴极材料的作用,加快过硫酸盐的活化.在电化学氧化耦合铁感应电极激发过硫酸盐(EC/IP/KPS)试验中,分别将电解时间(0-50 min)、电流密度(0-60 mA·cm^-2)和过硫酸钾(KPS)投加量(0-5 mmol·L^-1)作为控制条件,探讨了在不同的影响条件下该电化学反应体系对水中COD、TOC及UV254等有机物污染指标的降解程度.在此基础上,利用SEM、EDS、XRD和XPS等对EC/IP/KPS过程中产生的絮凝物进行了表征,进而推断EC/IP/KPS系统的反应机理.结果表明,在EC/IP/KPS系统中的耦合作用下,当电解时间为30 min、电流密度为30 mA·cm-2、过硫酸钾浓度为2 mmol·L^-1时,COD去除率可达77.0%、TOC去除率为54.0%,UV254值明显降低.此外,还对3种不同的实验过程进行了对比,发现EC/IP/KPS系统的处理效果要明显优于KPS和EC/IP处理体系.

Electrochemical(EC) oxidation coupling iron plate(IP) induction electrode excited persulfate(KPS) oxidation treatment of coking wastewater biochemical water. Electrochemical double electrolytic reaction system was built in the iron plate equidistantly between the reactor cathode and anode. In this system iron plate(IP) as an inductive electrode, acted as an anode material as well as a cathode material, accelerating the activation of persulfate. In an electrochemical oxidation coupled iron plate induction electrode induced persulfate test, electrolysis time(0-50 min), current density(0-60 mA·cm-2) and persulfate(KPS) addition amount(0-5 mmol·L^-1) were used as the control conditions, the degradation degree of organics pollution indexes including COD, TOC and UV254 was discussed under different conditions. On this basis, the flocs produced in the EC/IP/KPS process were characterized by SEM, EDS, XRD and XPS, and the reaction mechanism of the EC/IP/KPS system was inferred. The results showed that when the electrolysis time was 30 min, the current density was 30 mA·cm-2, and the persulfate concentration was 2 mmol·L^-1, the COD removal rate was 77.0%, the TOC removal rate was 54.0% and the UV254 value was reduced significantly under the coupling effect of EC/IP/KPS system. It was found that the processing effect of EC/IP/KPS system was better significantly than that of the PS and EC/IP systems, during the comparison of three different experimental processes.