Zou Rusen, Tang Kai, Hambly Adam C, Chhetri Ravi Kumar, Yang Xiaoyong, Xu Mingyi, Su Yanyan, Andersen Henrik Rasmus, Angelidaki Irini, Zhang Yifeng
Department of Environmental Engineering, Technical University of Denmark, DK-2800 Lyngby, Denmark.
Carlsberg Research Laboratory, Bjerregaardsvej 5, 2500 Valby, Denmark.
J Hazard Mater. 2021 Aug 15;416:125905. doi: 10.1016/j.jhazmat.2021.125905. Epub 2021 Apr 16.
Bio-electro-Fenton is emerging as an alternative technology for the efficient and cost-effective removal of refractory micropollutants. Though promising, there are still several challenges that limit its wide application, including acidic operating conditions (pH at 2-3), the addition of supporting electrolytes (e.g., NaSO), and the issue of iron sludge generation. To address these challenges, a novel hybrid persulfate-photo-bioelectrochemical (PPBEC) system is proposed to remove model micropollutants (carbamazepine and clorfibric acid), from secondary effluent at low persulfate (PS) dosage and neutral pH. The effect of crucial operating parameters on the process was studied, including input voltage, cathodic aeration velocity, and PS dose. Under optimal conditions (0.6 V, 0.005 mL min mL and 1 mM), the PPBEC system achieved approx. 0.56-1.71 times greater micropollutant removal with 93% lower energy consumption when compared to the individual processes (UV/PS and PBEC). The improved performance was attributed to a faster production of sulfate radicals by UV irradiation, hydrogen peroxide activation and single-electron reduction, and hydroxyl radicals generated by UV irradiation. Furthermore, the transformation products of carbamazepine and clorfibric acid were identified and the probable pathways are proposed. Finally, the ecotoxicity of the PPBEC treated effluent was assessed by using Vibrio Fischeri, which exhibited a non-toxic effect.
生物电芬顿作为一种高效且经济高效去除难降解微污染物的替代技术正在兴起。尽管前景广阔，但仍有几个挑战限制了其广泛应用，包括酸性操作条件（pH值为2 - 3）、添加支持电解质（如NaSO）以及铁污泥产生的问题。为应对这些挑战，提出了一种新型的过硫酸盐 - 光 - 生物电化学混合（PPBEC）系统，以在低过硫酸盐（PS）剂量和中性pH条件下去除二级出水中的典型微污染物（卡马西平和氯贝酸）。研究了关键操作参数对该过程的影响，包括输入电压、阴极曝气速度和PS剂量。在最佳条件（0.6 V、0.005 mL min mL和1 mM）下，与单独的工艺（UV/PS和PBEC）相比，PPBEC系统实现了约0.56 - 1.71倍更高的微污染物去除率，且能耗降低了93%。性能的提升归因于通过紫外线照射更快地产生硫酸根自由基、过氧化氢活化和单电子还原，以及紫外线照射产生的羟基自由基。此外，还鉴定了卡马西平和氯贝酸的转化产物并提出了可能的途径。最后，使用费氏弧菌评估了PPBEC处理后出水的生态毒性，结果显示无毒性效应。
