The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875, PR China.
The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875, PR China.
Water Res. 2024 Nov 15;266:122317. doi: 10.1016/j.watres.2024.122317. Epub 2024 Aug 29.
The advanced oxidation process is an efficient technology for the degradation and detoxification of refractory organics to ensure water safety. However, most researches focus on improving pollutant degradation but overlook carbon emission and resource utilization. In this study, a flow-through electrochemical integrated system was constructed to simultaneously realize bisphenol A (BPA) oxidation into small non-toxic organics and CO, and generated CO coupled with nitrate-containing wastewater conversion to urea and ammonia on a porous cathode (Zr-Fe/CN). The synergistic effect between anodic BPA oxidation with cathodic CO and NOreduction improves the electron utilization efficiency and thus increasing the BPA degradation, urea yield rate (UYR) and NH yield rate (NYR) by 13.4 % 18.4 % and 8.3 %, respectively. Furthermore, the flow-through operation mode significantly increased the mass transfer efficiency and quickly carried generated CO from the anode into the cathode to improve CO utilization efficiency. Compared to the parallel plate electrode reactor, the BPA degradation efficiency, UYR and NYR in the flow-through reactor increased from 59.46 % to 84.49 % (the initial concentration of BPA was 40 mg/L), 9.94 mmol hg to 19.55 mmol hg, and 80.31 mmol hg to 106.06 mmol hg within 60 min, respectively. Moreover, the total carbon conversion efficiency (from BPA to urea) increased from 20.2 % to 42.4 % and the total Faraday efficiency (FE) increased from 78.6 % to 96.3 %. This work provides a multi-win strategy of harmless, resource-based and carbon emission reduction for wastewater treatment.
高级氧化工艺是一种降解和解毒难处理有机物以确保水安全的有效技术。然而，大多数研究都集中在提高污染物降解效率上，但忽略了碳排放和资源利用。在这项研究中，构建了一个流通式电化学集成系统，以同时实现双酚 A（BPA）氧化成小的无毒有机物和 CO，并在多孔阴极（Zr-Fe/CN）上生成 CO 与含硝酸盐废水转化为尿素和氨。阳极 BPA 氧化与阴极 CO 和 NO还原的协同作用提高了电子利用效率，从而分别将 BPA 降解、尿素产率（UYR）和氨产率（NYR）提高了 13.4%、18.4%和 8.3%。此外，流通操作模式显著提高了传质效率，并迅速将生成的 CO 从阳极带入阴极，以提高 CO 利用效率。与平行板电极反应器相比，在流通式反应器中，BPA 降解效率、UYR 和 NYR 从 59.46%提高到 84.49%（初始 BPA 浓度为 40mg/L）、9.94mmol hg 提高到 19.55mmol hg 和 80.31mmol hg 提高到 106.06mmol hg，分别在 60 分钟内。此外，总碳转化率（从 BPA 到尿素）从 20.2%提高到 42.4%，总法拉第效率（FE）从 78.6%提高到 96.3%。这项工作为废水处理提供了一种无害、基于资源和减少碳排放的多赢策略。
