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Achieving fast start-up of anammox process by promoting the growth of anammox bacteria with FeS addition
npj Clean Water ( IF 11.4 ) Pub Date : 2020-10-15 , DOI: 10.1038/s41545-020-00088-w
Chunzhen Zou , Beibei Guo , Xuming Zhuang , Liying Ren , Shou-Qing Ni , Shakeel Ahmad , Zhuangming Qiao , Zhaojie Cui , Jinglan Hong

The effects of FeS on nitrogen removal performance and microbial community of anammox process were studied. During the start-up period, the removal efficiencies of nitrite and total nitrogen were significantly improved by FeS. The addition of FeS increased the content of iron ions in the reactor and promoted the synthesis of heme c, which was involved in the formation of various enzymes. Compared with the control, the abundance of anammox bacteria in the FeS reactor was increased by 29%, and the expression level of the nirS gene (encoding cd1 type nitrite reductase containing heme) was nearly doubled. The content of nitrite reductase (ammonia-forming) in the community was increased by 26.4%. The difference in functional bacteria and enzyme contents in the microbial community resulted in a difference in nitrogen removal rate (NRR) between the two reactors. High-throughput results indicated that FeS increased the richness and diversity of microbial community and enhanced the metabolic function of the microbial community. The addition of FeS did not change the dominant position of Ca. Kuenenia in both reactors. But the relative abundance of heterotrophic denitrifying bacteria was reduced with FeS, which may be related to the inhibition effect of S2− produced by FeS.



中文翻译:

通过添加FeS促进厌氧细菌的生长来实现厌氧菌工艺的快速启动

研究了FeS对厌氧氨氧化工艺脱氮性能和微生物群落的影响。在启动期间,FeS显着提高了亚硝酸盐和总氮的去除效率。FeS的添加增加了反应器中铁离子的含量并促进了血红素c的合成,而血红素c参与了各种酶的形成。与对照相比,FeS反应器中的厌氧细菌的丰度提高了29%,nirS基因的表达水平(编码cd 1含血红素的亚型亚硝酸还原酶几乎增加了一倍。社区中亚硝酸还原酶(氨形成)的含量增加了26.4%。微生物群落中功能细菌和酶含量的差异导致两个反应器之间氮去除率(NRR)的差异。高通量结果表明,FeS增加了微生物群落的丰富性和多样性,并增强了微生物群落的代谢功能。FeS的添加不会改变Ca的主导地位两个反应堆中的Kuenenia。但是,FeS降低了异养反硝化细菌的相对丰度,这可能与FeS产生的S 2-的抑制作用有关。

更新日期:2020-10-16
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