Effect of Chelated Iron on Nitrogen Removal Efficiency and Microbial Community Structure in the Anaerobic Ferric Ammonium Oxidation

被引：2
作者：
Liao H.-Y. [1 ,2 ]
Song C. [1 ]
Wan L.-Y. [1 ,2 ]
Shi S.-P. [1 ,2 ]
Wang X.-Z. [1 ]
机构：
[1] Research Center for Process and Prevention of Water Pollution, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing
[2] University of Chinese Academy of Sciences, Beijing
来源：
Huanjing Kexue/Environmental Science | 2021年 / 42卷 / 09期
关键词：
Anaerobic ferric ammonium oxidation (FEAMMOX); Co-occurrence network; Community structure; Denitrification; Function prediction; Keystone species;
D O I：
10.13227/j.hjkx.202012216
中图分类号：
学科分类号：
摘要：
In order to understand the characteristics and interactions of the microbial community during the anaerobic ferric ammonium oxidation (FEAMMOX) process, this study investigated the effects of various forms of chelated iron on nitrogen removal efficiency and microbial community structure. After 77 days of reactor operation, the removal efficiency of total nitrogen was 83.32% for the ferric humate group, 43.67% for the ferric citrate group, 55.07% for the ferric sodium ethylene diamine tetraacetate group, and 12.65% for the ferric ammonium triacetate group. After the experiment, the abundance of denitrifying bacteria Comamonadaceae in ferric humate group was 17.57%, the abundance of Clostridium in ferric citrate group was 47.70%; and the abundance of denitrifying bacteria Thermomonas in the ferric sodium ethylene diamine tetraacetate group was 20.11%. This indicates that ferric humate is a more effective electron acceptor for the FEAMMOX process. The result of function prediction shows that the iron, sulfur, and nitrogen cycles are all closely related, with iron and sulfur metabolism playing an important role in nitrogen removal. In the humate group, iron respiration and the nitrogen cycle are more strongly correlated than other groups. Co-occurrence network analysis showed that the keystone species in the FEAMMOX process is Tessaracoccus. © 2021, Science Press. All right reserved.
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页码：4366 / 4373
页数：7
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