School of Civil Engineering and Architecture, University of Jinan, Jinan, 250022, China.
School of Civil Engineering and Architecture, University of Jinan, Jinan, 250022, China.
Environ Pollut. 2022 Jan 1;292(Pt A):118357. doi: 10.1016/j.envpol.2021.118357. Epub 2021 Oct 12.
Electric and magnetic fields characterized by high efficiency, low consumption and environment-friendly performance have recently generated interest as a possible measure to enhance the performance of the biological treatment process used to remove refractory organics. Few studies have been carried out to-date regarding the simultaneous application of electric and magnetic fields on biofilm process to degrade diclofenac. In this study, 3DEM-BAF was designed to evaluate the electrio-magnetic superposition effect on diclofenac removal performance, kinetics, community structure and synergistic mechanism. The results show that 3DEM-BAF could significantly increase the average removal rate of diclofenac by 65.30 %, 57.46 %, 9.48 % as compared with that of BAF, 3DM-BAF, 3DE-BAF, respectively. The diclofenac degradation kinetic constants and dehydrogenase activity of 3DEM-BAF were almost 6.72 and 2.53 times higher than those of BAF. Microorganisms of 3DEM-BAF in the Methylophilus and Methyloversatilis genera were distinctively enriched, which was attributed to the screening function of electric field and propagation effect of magnetic field. Moreover, three processes were found to contribute to diclofenac degradation, namely electro-magnetic-adsorption, electro-chemical oxidation and electro-magnetic-biodegradation. Thus, the simultaneous application of electric and magnetic fields on biofilm process was demonstrated to be a promising technique as well as a viable alternative in diclofenac degradation enhancement.
电场和磁场具有高效、低耗和环保的特点，最近作为一种提高生物处理去除难降解有机物性能的可能措施引起了人们的兴趣。迄今为止，关于同时应用电场和磁场对生物膜过程降解双氯芬酸的研究很少。本研究设计了 3DEM-BAF，以评估电-磁叠加效应对双氯芬酸去除性能、动力学、群落结构和协同机制的影响。结果表明，与 BAF、3DM-BAF 和 3DE-BAF 相比，3DEM-BAF 可分别显著提高双氯芬酸的平均去除率 65.30%、57.46%和 9.48%。3DEM-BAF 的双氯芬酸降解动力学常数和脱氢酶活性分别是 BAF 的 6.72 倍和 2.53 倍。3DEM-BAF 中的微生物中，甲基杆菌属和甲基弯菌属明显富集，这归因于电场的筛选功能和磁场的传播效应。此外，发现有三个过程有助于双氯芬酸的降解，即电-磁吸附、电化学氧化和电-磁生物降解。因此，同时应用电场和磁场于生物膜过程被证明是一种很有前途的技术，也是增强双氯芬酸降解的可行替代方法。
