A novel strain AL-6, which was identified as Acinetobacter baumannii, presented an efficient ability to remove ammonium. Nitrogen balance indicates that 55.8% of the initial NH₄⁺–N was ultimately converted to N₂ through heterotrophic nitrification and aerobic denitrification, while 30.6% was contributed to assimilation. More interestingly, efficient ammonium removal could be achieved in the presence of Cr(VI) of 0–10 mg L⁻¹ by strain AL-6. Meanwhile, Cr(VI) reduction was observed. The Cr(VI) was mainly reduced to less toxic Cr(III) by strain AL-6 in the culture, while a small part of Cr(VI) might be accumulated in bacterial cells in the formation of Cr(III). The optimal conditions for ammonium removal as well as Cr(VI) reduction was pH of 7 and C/N ratio of 10–15. This study provided a potential prospect for the treatment of Cr(VI)-containing ammonium wastewater.

被鉴定为鲍曼不动杆菌的新型AL-6菌株具有去除铵的有效能力。氮平衡表明，最初的NH ₄ ⁺ -N的55.8％通过异养硝化和好氧反硝化最终转化为N ₂，而30.6％的氮被吸收。更有趣的是，在Cr（VI）为0–10 mg L ^-1的情况下，可以实现有效的铵去除 通过AL-6菌株。同时，观察到Cr（VI）还原。在培养物中，AL-6菌株将Cr（VI）主要还原为毒性较小的Cr（III），而一小部分Cr（VI）可能会在细菌细胞中积累，形成Cr（III）。去除铵和还原Cr（VI）的最佳条件是pH值为7，C / N比为10-15。这项研究为处理含六价铬的铵废水提供了潜在的前景。