摘要

       高盐度是工业废水的一个共同特征，然而，关于盐度对含盐废水处理过程中抗生素抗性基因 (ARG) 和整体细菌群落的影响知之甚少。在这项研究中，三个反应器在不同盐度下运行 120 天，以研究 ARG 和微生物群落的动态。结果表明，当盐度从0增加到4%时，反应器的脱氮效率从85%下降到20%，而在4%的盐度下，仍然可以实现95%的有机物去除。有趣的是，发现在添加氯化钠的反应器中，ARGs（尤其是 sul2、tetG 和 amrB）的相对丰度下降了近 50%。相关性分析表明，在反应器的废水处理过程中，一些细菌操作分类单元与 ARGs 高度相关，表明高盐度可能会抑制一些携带 ARGs 的细菌的生长，并可能用作减少废水中 ARGs 的潜在方法处理系统。

       High salinity is a common feature of industrial wastewater, however, little is known about the impact of salinity on antibiotic resistance genes (ARGs) and overall bacteria communities in saline wastewater treatment processes. In this study, three reactors were operated for 120 days under different salinities to investigate the dynamics of ARGs and microbial communities. The results showed that the nitrogen removal efficiency of the reactors decreased from 85% to 20% when the salinity was increased from zero to 4%, while 95% organic matter removal could still be achieved at 4% salinity. Interestingly, it was found that the relative abundance of ARGs (especially sul2, tetG and amrB) dropped by almost 50% in the reactor added with sodium chloride. Correlation analysis showed that some bacterial operational taxonomic units were highly associated with the ARGs during wastewater treatment processes in the reactors, suggesting that high salinity may inhibit the growth of some bacteria carrying ARGs and may be used as a potential approach for ARG reduction in the wastewater treatment systems.

https://www.sciencedirect.com/science/article/abs/pii/S1385894718300846