Liu Sitong, Yang Fenglin, Meng Fangang, Chen Huihui, Gong Zheng
Key Laboratory of Industrial Ecology and Environmental Engineering, MOE, School of Environmental and Biological Science and Technology, Dalian University of Technology, Dalian 116024, PR China.
J Biotechnol. 2008 Nov 25;138(3-4):96-102. doi: 10.1016/j.jbiotec.2008.08.002. Epub 2008 Aug 20.
Anaerobic ammonium oxidation (anammox) process has been becoming a promising technology for the removal of nitrogenous contaminants from wastewater. In short-term batch tests, we observed the anaerobic ammonium oxidizing activity of anammox consortium increased as the magnetic field varied in the range of 16.8-95.0mT. A maximum 50% increase was obtained at the value of 75.0mT. In order to study long-term effect of magnetic field on anammox consortium, an anammox reactor with magnetic field of 60.0mT was operated in laboratory-scale. The results demonstrated that a significant 30% increase in maximum nitrogen removal rate and an approximate 1/4 saving in cultivation time were achieved by using the magnetic system. Microbiological composition analysis showed that bacterial diversity in the reactor decreased under magnetic-exposed condition. Nevertheless, some strains belonging to Planctomycetales were highly enriched. These findings indicated that the magnetic field was useful and reliable for fast start-up of anammox process since it was proved as a simple and convenient approach to enhance anaerobic ammonium oxidizing activity.
厌氧氨氧化（anammox）工艺已成为一种从废水中去除含氮污染物的有前景的技术。在短期批次试验中，我们观察到随着磁场在16.8 - 95.0mT范围内变化，厌氧氨氧化菌团的厌氧氨氧化活性增加。在75.0mT时获得了高达50%的最大增幅。为了研究磁场对厌氧氨氧化菌团的长期影响，在实验室规模下运行了一个磁场强度为60.0mT的厌氧氨氧化反应器。结果表明，使用磁系统可使最大氮去除率显著提高30%，培养时间节省约四分之一。微生物组成分析表明，在磁场暴露条件下，反应器中的细菌多样性降低。然而，一些属于浮霉菌目的菌株高度富集。这些发现表明，磁场对于厌氧氨氧化工艺的快速启动是有用且可靠的，因为它被证明是一种增强厌氧氨氧化活性的简单便捷方法。
