Abstract Inorganic nitrogen and Cr (VI) often co-exist in wastewater and have been a major threat to ecological equilibrium and public health. In this work, we successfully isolated Pseudomonas aeruginosa LX from activated sludge, which was capable of simultaneously degrading ammonia and reducing Cr (VI). Single factor experiments showed that strain LX exhibited efficient ability to remove inorganic nitrogen and it possessed efficient nitrogen removal ability in presence of multiple nitrogen sources. A possible pathway of ammonia removal for strain LX was proposed and was as follows: NH4+-N → NH2OH → NO2−-N → NO3−-N → NO2−-N → NO → N2O → N2. Moreover, more than 80% of 100 mg L-1 NH4+-N could be removed at 30 mg L-1 Cr (VI) and properly increasing ammonia concentration could promote the reduction of Cr (VI). Additionally, immobilized strain LX could degrade ammonia and reduce Cr (VI) to Cr (Ⅲ) well in sequencing batch reactor (SBR). Therefore, strain LX was a suitable candidate to simultaneously remove Cr (VI) and ammonia nitrogen.

中文翻译：

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铜绿假单胞菌LX同时去除废水中的氨和六价铬

摘要 无机氮和六价铬在废水中经常共存，对生态平衡和公众健康构成重大威胁。在这项工作中，我们成功地从活性污泥中分离出铜绿假单胞菌LX，它能够同时降解氨和减少Cr（VI）。单因素实验表明，LX菌株表现出高效的无机氮去除能力，在多种氮源存在下具有高效的除氮能力。提出了菌株LX去除氨的可能途径，如下：NH4+-N→NH2OH→NO2--N→NO3--N→NO2--N→NO→N2O→N2。此外，30 mg L-1 Cr (VI) 可去除100 mg L-1 NH4+-N 80%以上，适当增加氨浓度可促进Cr (VI) 的还原。此外，固定化菌株LX在序批式反应器（SBR）中能很好地降解氨并将Cr（VI）还原为Cr（Ⅲ）。因此，菌株 LX 是同时去除 Cr (VI) 和氨氮的合适候选者。