Environ Technol. 2014 May-Jun;35(9-12):1358-66. doi: 10.1080/09593330.2013.868529.
Nitrogen monoxide (NO) and nitrogen dioxide referred as NOx are one of the most important air pollutants in the atmosphere. Biological NOx removal technologies have been developing to reach a cost-effective control method for upcoming stringent NOx emission standards. The BioDeNOx system was seen as a promising biological NOx control technology which is composed of two reactors, one for absorbing of NO in an aqueous Fe(II)EDTA2- solution and the other for subsequent reduction to N2 gas in a biological reactor by the denitrification process. In this study, instead of two discrete reactors, only one jet-loop bioreactor (JLBR) was utilized as both absorption and denitrification unit and no chelate-forming chemicals were added. In other words, the advantage of better mass transfer conditions of jet bioreactor was used instead of Fe(II)EDTA2-. The process was named as Jet-BioDeNOx. The JLBR was operated for the removal of NOx from air streams containing 500-3000 ppm NOx and the results showed that the removal efficiency was between 81% and 94%. The air to liquid flow ratio (Q(G)/Q(RAS)) varied in the range of 0.07-0.12. Mathematical modelling of the system demonstrated that the removal efficiency strongly depends on this ratio. The high mass transfer conditions prevailed in the reactor provided a competitive advantage on removing NO gas without any requirement of chelating chemicals.
一氧化氮（NO）和二氧化氮被称为氮氧化物（NOx），是大气中最重要的空气污染物之一。为了达到即将出台的严格的氮氧化物排放标准，生物脱氮技术一直在发展，以寻求一种具有成本效益的控制方法。BioDeNOx 系统被视为一种很有前途的生物氮氧化物控制技术，它由两个反应器组成，一个用于在含有 Fe(II)EDTA2-的水溶液中吸收 NO，另一个用于在生物反应器中通过反硝化过程将其还原为 N2 气体。在本研究中，采用了一个射流环生物反应器（JLBR）替代两个独立的反应器，同时作为吸收和反硝化单元，且不添加螯合形成化学物质。换句话说，利用射流生物反应器更好的传质条件代替了 Fe(II)EDTA2-。该过程被命名为 Jet-BioDeNOx。JLBR 用于从含有 500-3000ppmNOx 的气流中去除氮氧化物，结果表明去除效率在 81%-94%之间。气液比（Q(G)/Q(RAS))在 0.07-0.12 之间变化。系统的数学模型表明，去除效率强烈依赖于这个比值。反应器中存在的高传质条件为去除 NO 气体提供了竞争优势，而无需使用螯合化学物质。
