Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Water Res. 2018 Mar 1;130:291-299. doi: 10.1016/j.watres.2017.12.005. Epub 2017 Dec 5.
Due to highly recalcitrant and toxicological nature of pyridine, the conventional anaerobic bioprocess is often limited by low removal rate and poor process stability. In this study, an electricity-assisted anaerobic system was developed in order to enhance biodegradation of pyridine from wastewater. The results showed that the performance and stability of the anaerobic reactor was remarkably improved for pyridine biodegradation with the applied direct current of 0.3 mA, where the efficiencies of pyridine and total organic carbon removal as well as NH-N formation were as high as 100.0%, 96.1 ± 1.2% and 60.1 ± 2.1% respectively. The compact biofilm due to electrical stimulation as well as the microaerobic environment in the bioanode might promote pyridine bio-mineralization in the anaerobic reactor. Moreover, the species related to pyridine biodegradation (Desulfovibrio, Dokdonella, Hydrogenophaga, and Paracoccus) were enriched in the anodic biofilm, which would be another reason for better reactor performance. This study demonstrated that electrical stimulation would be a potential alternative for the enhancement of pyridine removal from wastewater in anaerobic systems.
由于吡啶具有很强的抗降解性和毒性，传统的厌氧生物处理过程通常受到去除率低和工艺稳定性差的限制。在这项研究中，开发了一种电辅助厌氧系统，以增强废水中吡啶的生物降解能力。结果表明，在施加 0.3 mA 直流电的情况下，厌氧反应器的性能和稳定性得到了显著提高，吡啶和总有机碳的去除效率以及 NH-N 的生成效率分别高达 100.0%、96.1±1.2%和 60.1±2.1%。电刺激形成的致密生物膜以及生物阳极中的微氧环境可能促进了吡啶在厌氧反应器中的生物矿化。此外，与吡啶生物降解相关的物种（脱硫弧菌、Dokdonella、噬氢菌和副球菌）在阳极生物膜中得到了富集，这也是反应器性能更好的另一个原因。本研究表明，电刺激可能是增强厌氧系统中废水中吡啶去除的一种有潜力的替代方法。
