游离亚硝酸暴露对氨氧化菌和亚硝酸盐氧化菌的灭活和适应。
Inactivation and adaptation of ammonia-oxidizing bacteria and nitrite-oxidizing bacteria when exposed to free nitrous acid.
机构信息
National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, PR China.
Advanced Water Management Center, The University of Queensland, St Lucia, QLD 4072, Australia.
出版信息
Bioresour Technol. 2017 Dec;245(Pt A):1266-1270. doi: 10.1016/j.biortech.2017.08.074. Epub 2017 Aug 15.
Inactivation and adaptation of ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB) to free nitrous acid (FNA) was investigated. Batch test results showed that AOB and NOB were inactivated when treated with FNA. After an 85-day operating period, AOB in a continuous pre-denitrification reactor did not adapt to the FNA that was applied to treat some of the return activated sludge. In contrast, NOB did adapt to FNA. NOB activity in the seed sludge was only 11% of the original activity after FNA batch treatment, at 0.75mg HNO-N/L. NOB activity in the pre-denitrification reactor was not affected after being exposed to this FNA level. Nitrosomonas was the dominant AOB before and after long-term FNA treatment. However, dominant NOB changed from Nitrospira to Candidatus Nitrotoga, a novel NOB genus, after long-term FNA treatment. This adaptation of NOB to FNA may be due to the shift in NOB population makeup.
研究了游离亚硝酸（FNA）对氨氧化菌（AOB）和亚硝酸盐氧化菌（NOB）的灭活和适应作用。批式试验结果表明，AOB 和 NOB 受到 FNA 处理时会被灭活。在连续预反硝化反应器运行 85 天后，AOB 没有适应用于处理部分回流活性污泥的 FNA。相比之下，NOB 适应了 FNA。FNA 批量处理后，种子污泥中的 NOB 活性仅为原始活性的 11%，为 0.75mg HNO-N/L。NOB 在预反硝化反应器中的活性在暴露于该 FNA 水平后没有受到影响。在长期 FNA 处理前后，亚硝化单胞菌都是优势 AOB。然而，在长期 FNA 处理后，优势 NOB 从硝化螺旋菌变为新型的 NOB 属——Candidatus Nitrotoga。NOB 对 FNA 的这种适应可能是由于 NOB 种群结构的变化。
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