Advanced Water Management Centre, The University of Queensland, St Lucia 4072, Queensland, Australia.
Water Sci Technol. 2011;63(2):345-51. doi: 10.2166/wst.2011.062.
Enhanced biological phosphorus removal (EBPR) normally occurs together with nitrogen removal in wastewater treatment plants (WWTPs). In recent years, efforts have been devoted to remove nitrogen via the nitrite pathway (oxidation of ammonia to nitrite and reduction of nitrite to nitrogen gas without going through nitrate), reducing the requirement for carbon and oxygen in the plant. However nitrite and free nitrous acid (FNA), the protonated species of nitrite, have been shown to cause EBPR deterioration under certain concentrations. This study provides a direct comparison between the different levels of FNA inhibition in the aerobic processes of polyphosphate accumulating organisms (PAOs) and glycogen accumulating organisms (GAOs) by reviewing the studies published in this area. Also, new data is presented assessing the FNA effect on the anaerobic metabolism of these two groups of bacteria. Overall, FNA has shown inhibitory effects on most of the processes involved in the metabolism of PAOs and GAOs. However, the inhibition-initiation levels are different between different processes and, even more importantly between the two groups. In general, PAOs appear to be more affected than GAOs at the same level of FNA, thus giving GAOs competitive advantage over PAOs in EBPR systems when nitrite is present.
强化生物除磷 (EBPR) 通常与废水处理厂 (WWTP) 中的氮去除同时发生。近年来，人们一直致力于通过亚硝酸盐途径去除氮（将氨氧化为亚硝酸盐，然后将亚硝酸盐还原为氮气，而不经过硝酸盐），从而减少工厂对碳和氧的需求。然而，亚硝酸盐和游离亚硝酸 (FNA)，即亚硝酸盐的质子化形式，已被证明在某些浓度下会导致 EBPR 恶化。本研究通过回顾该领域发表的研究，直接比较了聚磷菌 (PAO) 和糖原积累菌 (GAO) 好氧过程中不同水平的 FNA 抑制作用。此外，还提出了新的数据来评估 FNA 对这两组细菌厌氧代谢的影响。总的来说，FNA 对 PAO 和 GAO 代谢过程中的大多数过程都表现出抑制作用。然而，在不同的过程之间，甚至在两组之间，抑制起始水平是不同的。一般来说，在相同的 FNA 水平下，PAO 似乎比 GAO 受到的影响更大，因此当亚硝酸存在时，GAO 在 EBPR 系统中比 PAO 具有竞争优势。
