<br>Ti/RuO2-IrO2阳极电化学氧化堆肥渗滤液生化出水响应面优化及失效机理,Chemosphere

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Ti/RuO2-IrO2阳极电化学氧化堆肥渗滤液生化出水响应面优化及失效机理
Chemosphere ( IF 8.1 ) Pub Date : 2023-04-28 , DOI: 10.1016/j.chemosphere.2023.138777
Xianni Song ₁ , Xu Chen ₂ , Shuchi Zhang ₁ , Donglei Wu ₃

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在这项工作中，通过响应面法（RSM）优化了堆肥渗滤液生化流出物（CLBE）电化学氧化（EO）的电解过程条件。同时，通过加速寿命测试，分别对单一电解质溶液体系（H2SO4 和 NaCl）和实际废水（CLBE）中 Ti/RuO2-IrO2 负极的失效特性进行了比较研究。RSM 优化结果表明，30 min 时 COD 、 NH3–N 和 TN 去除率分别为 50.53%、100% 和 95.61%，理想值为 0.993。同时，对失效前后的电极进行了电化学和材料表征，从而阐明了 Ti/RuO2–IrO2 阳极的失效机制。总的来说，H2SO4 溶液的真正失败归因于涂层溶解和 Ti 基材氧化。相比之下，由于 NaCl 和 CLBE 溶液中的“气泡效应”，电极表现出“明显失效”，并且形成的“有效粗糙度”补偿了由于没有涂层而造成的活性损失。此外，由于电流边缘效应和有机物的存在，Ti 衬底在 CLBE 溶液中发生了额外的溶解。本文以实际废水为研究对象，揭示了其电极失效机理，为后续优化实际电极使用寿命提供了理论依据和参考。

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Ti/RuO2-IrO2 anodic electrochemical oxidation composting leachate biochemical effluent: Response surface optimization and failure mechanism

In this work, the electrolytic process conditions for the electrochemical oxidation (EO) of composting leachate biochemical effluent (CLBE) were optimized via the response surface methodology (RSM). Meanwhile, a comparative study had been done on the failure characteristics of Ti/RuO2–IrO2 anodes in a single electrolyte solution system (H2SO4 and NaCl) and real wastewater (CLBE) by accelerated life tests, respectively. The RSM optimization results showed that the COD, NH3–N and TN removal rates were 50.53%, 100% and 95.61% at 30 min, respectively, with a desirability value of 0.993. In parallel, the electrochemical and material characterizations were carried out on the electrodes before and after failure, by which the failure mechanism of Ti/RuO2–IrO2 anodes was clarified. On the whole, the true failure in the H2SO4 solution was attributed to coating dissolution and Ti substrate oxidation. In contrast, the electrode exhibited “apparent failure” due to the “bubble effect” in both NaCl and CLBE solutions, and the “effective roughness” formed compensated for the loss of activity caused by the absence of the coating. Besides, additional dissolution of the Ti substrate occurred in the CLBE solution due to the current edge effect and the presence of organic matter. This paper takes the actual wastewater as the research object and reveals its electrode failure mechanism, which provides a theoretical basis and reference for the subsequent optimization of the actual electrode service life.

更新日期：2023-04-28

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