Wastewater treatment under low dissolved oxygen (DO) conditions is promising for its low energy consumption. However, the removal process of some organic micropollutants, such as triclosan (TCS), could be inhibited under anaerobic conditions. So, it is worth investigating the TCS removal performance at low-oxygen condition. In this study, simultaneous nitrification and denitrification (SND) process, with DO ranging from 0.30 to 0.80 mg L-1, was chosen to investigate. Results showed that the water quality of the effluent was deteriorated after TCS addition at the beginning, with removal efficiency of NH4+-N dropped from almost 100 ± 0.70 to 88.30 ± 0.98% and COD decreased from 95.15 ± 1.55 to 65.81 ± 2.42 %. However, the performance recovered from the 3rd day and almost stabilized on the 14th day with the removal efficiencies of NH4+-N were over 98.00 ± 0.60 %, and COD was above 94.00 ± 1.70 % in effluent. Besides, TCS removal efficiencies were more than 93.00 %, and the contributions for TCS removal by the water effluent, sludge sorption, and other effects including biodegradation were 6.46 ± 2.25, 16.27 ± 3.30, and 77.27 ± 4.45 %, respectively. Although the results of absolute abundances of related genes showed no difference (P > 0.05), Illumina MiSeq sequencing analysis presented the variation of microbial community after TCS addition, in which T-45 had the highest Shannon and Simpson diversity index, followed by T-0 and T-2. Relative abundances of alpha and beta-Proteobacteria, which were related to TCS biodegradation, were increased. Compared with Bacteroidetes in T-0, the abundance of Bacteroidetes took up more than 15.6 % in T-45, which should play a more important role under low-oxygen conditions with TCS addition.

译文

低溶解氧 (DO) 条件下的废水处理因其低能耗而很有希望。然而,在厌氧条件下,某些有机微污染物 (例如三氯生 (TCS)) 的去除过程可能会受到抑制。因此,值得研究低氧条件下TCS的去除性能。在这项研究中,选择了同时硝化和反硝化 (SND) 过程,其DO L-1为0.30至0.80 mg。结果表明,开始添加TCS后,出水水质恶化,NH4-N的去除效率从几乎100 ± 0.70降至88.30 ± 0.98%,COD从95.15 ± 1.55降至65.81 ± 2.42%。然而,性能从第3天恢复,并在第14天几乎稳定,NH4-N的去除效率超过98.00 ± 0.60%,废水中的COD高于94.00 ± 1.70%。此外,TCS去除效率超过93.00%,出水,污泥吸附和包括生物降解在内的其他作用对TCS去除的贡献分别为6.46 ± 2.25,16.27 ± 3.30和77.27 ± 4.45%。尽管相关基因的绝对丰度结果无差异 (P> 0.05),但Illumina MiSeq测序分析显示了添加TCS后微生物群落的变异,其中T-45的Shannon和Simpson多样性指数最高,其次是T-0和T-2。与TCS生物降解有关的 α 和 β-变形菌的相对丰度增加。与T-0中的拟杆菌相比,拟杆菌在T-45中的丰度超过15.6%,在低氧条件下添加TCS应发挥更重要的作用。

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