In this study, we examined the kinetics and selectivity of chemical oxygen demand (COD) degradation by electrochemically generated reactive oxygen species (RCS) in variable wastewater matrix. According to measurements on reactive oxidants and linear sweep voltammetry, oxidation of organics either via reactive oxygen species or direct electron transfer played a minor role for the active IrO₂ anode. The RCS (mostly free chlorine in bulk solution) exclusively mediated an indirect oxidation with mean current efficiency from 25 to 40%. In batch galvanostatic experiments for single polymeric compounds, the rate of COD reduction showed marginal variations in spite of the large difference in reactivity with the RCS. Eight different wastewater samples were prepared from greywater and urine for potentiostatic experiments. The kinetics of COD degradation in municipal wastewater was observed to more sluggish than in the urinary samples with initial elevations in [COD]. Fractionation of COD into proteins, carbohydrates, and carboxylates could explain the shift in kinetics, in terms of the reactivity with RCS and the ratio of COD to theoretical oxygen demand (ThOD) for each components. The anaerobic biodegradation of the organic matrix greatly improved the subsequent reactivity with RCS, which rationalizes a combination of electrochemical processes with biological pretreatment.

在这项研究中，我们研究了在可变废水基质中通过电化学产生的活性氧物质（RCS）降解化学需氧量（COD）的动力学和选择性。根据对活性氧化剂和线性扫描伏安法的测量，通过活性氧或直接电子转移对有机物的氧化对于活性IrO _2的作用较小。阳极。RCS（主要是本体溶液中的游离氯）专门介导间接氧化，平均电流效率为25％至40％。在单个聚合物的分流恒电流实验中，尽管与RCS的反应性差异很大，但COD的降低率却显示出很小的变化。从灰水和尿液中制备了八种不同的废水样品用于恒电位实验。观察到，城市污水中COD降解的动力学要比最初以[COD]升高的尿液样品更慢。根据与RCS的反应性以及每种成分的COD与理论需氧量（ThOD）的比率，可以将COD分为蛋白质，碳水化合物和羧酸盐来解释动力学变化。