School of Civil Engineering, Wuhan University, Wuhan 430072, China.
School of Civil Engineering, Wuhan University, Wuhan 430072, China.
Bioresour Technol. 2021 Feb;322:124570. doi: 10.1016/j.biortech.2020.124570. Epub 2020 Dec 28.
Weak magnetic field (WMF) and aerobic granular sludge (AGS) technology were both robust technologies in wastewater treatments. In this study, the AGS characteristics and nutrient removal performances were all estimated at the load of 20 to 40 mg/L ammonia nitrogen (NH-N) and 0 to 40mT magnetic field. Results showed that 10mT was beneficial for keeping stable structure of granules when increasing NH-N load, accompanied with increasing protein (PN) secretion in EPS. Besides, all the total nitrogen (TN) removal rate under 10mT reached above 90%, while they were all less than 80% under other WMF strength when loading with 40 mg/L NH-N. Moreover, the simultaneous nitrification and denitrification (SND) efficiency could be enhanced by WMF of 10mT. Illumina MiSeq sequencing showed that NH-N load changed the bacterial richness and diversity when the magnetic strength was 10mT. And Candidatus_Competibacter was identified as the main functional genes for effective operation in this system.
弱磁场（WMF）和好氧颗粒污泥（AGS）技术都是废水处理中强大的技术。在这项研究中，在 20 至 40mg/L 氨氮（NH-N）和 0 至 40mT 磁场的负荷下，均评估了 AGS 的特性和养分去除性能。结果表明，在增加 NH-N 负荷时，10mT 有利于保持颗粒的稳定结构，同时 EPS 中蛋白质（PN）分泌增加。此外，在 10mT 下，所有总氮（TN）去除率均高于 90%，而在 NH-N 负荷为 40mg/L 时，其他 WMF 强度下的 TN 去除率均低于 80%。此外，10mT 的 WMF 可以提高同步硝化反硝化（SND）效率。Illumina MiSeq 测序表明，当磁场强度为 10mT 时，NH-N 负荷改变了细菌的丰富度和多样性。并且，在该系统中，被鉴定为主要功能基因的是 Candidatus_Competibacter。
