The utilization of halophilic bioresources is limited due to a lack of isolation and characterization work. A halophilic bacterium strain SND-01 of Exiguobacterium mexicanum was isolated in this study, which is the first report on its novel function in heterotrophic nitrification-aerobic denitrification (HN-AD). The strain SND-01 is slightly halophilic, surviving at 0 up to 9% (w/v) salinity. When utilizing ammonium, nitrate or nitrite as the sole nitrogen source in aerobic conditions, the isolated strain showed the maximum nitrogen removal rate of 2.24 ± 0.14 mg/(L·h), 3.63 ± 0.21 mg/(L·h) and 2.30 ± 0.23 mg/(L·h), respectively. Functional genes and key enzymes involved in heterotrophic-aerobic nitrogen transformations were characterized, establishing the pathway of HN-AD. The nitrogen removal via HN-AD is dependent on the C/N ratio, salinity and temperature. The halophilic Exiguobacterium mexicanum strain SND-01 shows a significant potential in biotreatment of saline wastewater in an easy and cost-effective way.

由于缺乏隔离和表征工作，嗜盐生物资源的利用受到限制。墨西哥州杆菌的嗜盐细菌菌株SND-01在这项研究中是分离的，这是其在异养硝化-好氧反硝化（HN-AD）中的新功能的首次报道。SND-01菌株略微嗜盐，可在0盐度下存活至9％（w / v）。当在有氧条件下使用铵盐，硝酸盐或亚硝酸盐作为唯一的氮源时，分离出的菌株显示出最大脱氮率分别为2.24±0.14 mg /（L·h），3.63±0.21 mg /（L·h）和2.30±分别为0.23mg /（L·h）。表征了异养-好氧氮转化的功能基因和关键酶，建立了HN-AD的途径。通过HN-AD脱氮取决于C / N比，盐度和温度。嗜盐杆菌墨西哥州杆菌 SND-01菌株以简单且经济高效的方式在盐水生物处理中显示出巨大的潜力。