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首页> 外文期刊>RSC Advances >Evaluation of a novel low-carbon to nitrogen- and temperature-tolerant simultaneously nitrifying–denitrifying bacterium and its use in the treatment of river water
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Evaluation of a novel low-carbon to nitrogen- and temperature-tolerant simultaneously nitrifying–denitrifying bacterium and its use in the treatment of river water

机译：一种新型的低碳耐氮耐温同时硝化反硝化细菌的评价及其在河水处理中的应用

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In this study, a simultaneously heterotrophic nitrifying–aerobic denitrifying bacterium, designated KSND, was newly isolated from a lake wetland. Its removal efficiencies for 160 mg L ~(?1) ammonium, 105 mg L ~(?1) nitrate, and 8.39 mg L ~(?1) nitrite were 86.56%, 74.52%, and 100% in 24 h, with removal rates of 5.77 mg L ~(?1) h ~(?1) for NH _(4) ~(+) –N, 3.26 mg L ~(?1) h ~(?1) for NO _(3) ~(?) –N, and 0.35 mg L ~(?1) h ~(?1) for NO _(2) ~(?) –N. The bacterium retained ～63% of its maximal removal rate at 10 °C and 56% of its maximal removal rate at a carbon to nitrogen (C/N) ratio of 4?:?1, with no nitrite accumulation. Gene-specific PCR indicated the absence of the key genes for nitrification and denitrification, encoding hydroxylamine oxidoreductase and nitrite reductase, respectively, suggesting that KSND achieves effective nitrogen removal by another pathway. KSND was used to treat river wastewater by culturing it in a floating bed bioreactor. Ammonia nitrogen decreased significantly from 8.76 mg L ~(?1) initially to 1.87 mg L ~(?1) in 90 days, with no NO _(3) ~(?) –N or NO _(2) ~(?) –N toxicants, indicating the great potential utility of KSND in future full-scale applications in the treatment of low-C/N wastewater.
机译：在这项研究中，从湖湿地中新分离了同时异养的硝化-需氧反硝化细菌，称为KSND。在去除后的24小时内，其对160 mg L〜（？1）铵，105 mg L〜（？1）硝酸盐和8.39 mg L〜（？1）亚硝酸盐的去除效率分别为86.56％，74.52％和100％。 NH _（4）〜（+）–N为5.77 mg L〜（？1）h〜（？1），NO _（3）〜3.26 mg L〜（？1）h〜（？1） （？）–N，对于NO _（2）〜（？）–N，0.35 mg L〜（？1）h〜（？1）。在10°C时，该细菌的最大去除率保持在〜63％左右，而碳氮比（C / N）为4？：？1时，则保持在最大去除率的56％左右，且无亚硝酸盐积累。基因特异性PCR指示缺少硝化和反硝化的关键基因，分别编码羟胺氧化还原酶和亚硝酸盐还原酶，这表明KSND通过另一种途径实现了有效的氮去除。 KSND通过在浮床生物反应器中培养来处理河流废水。氨氮在90天内从最初的8.76 mg L〜（？1）显着降低至1.87 mg L〜（？1），无NO _（3）〜（？）–N或NO _（2）〜（？） -N毒物，表明KSND在处理低碳/氮废水的未来全面应用中具有巨大的潜力。

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