Specific Denitrifying and Dissimilatory Nitrate Reduction to Ammonium Bacteria Assisted the Recovery of Anammox Community From Nitrite Inhibition

• DOI: 10.3389/fmicb.2021.781156
• Publication Date: 2022-01-20T07:33:09Z
• Authors: Xuejiao Qiao; Liyu Zhang; Zhiguang Qiu; Li Wang; Yang Wu; Chunfang Deng; Jia Su; Xue Zhang; Yuexing Wang; Bing Li; Lijie Zhou; Anthony Y. W. Ma; Wei-Qin Zhuang; Ke Yu
• Keywords: Anammox

The anaerobic ammonium oxidation (anammox) by autotrophic ammonia-oxidizing bacteria (AnAOB) is a biological process used to remove reactive nitrogen from wastewater. It has been repeatedly reported that elevated nitrite concentrations can severely inhibit the growth of AnAOB, which renders anammox challenging for industrial-scale applications. Both denitrifying (DN) and dissimilatory nitrate reduction (DNRA) potentially consume excess in an system prevent its inhibitory effect on AnAOB. However, metabolic interactions among DN, DNRA, AnAOB under conditions remain be elucidated at resolutions. In this study, laboratory-scale bioreactor was conduct investigation microbial shift functional DNRA during long-term inhibition eventual self-recovery episode. relative abundance first decreased due high concentration, lowered system's removal efficiency, but then recovered automatically without any external interference. Based variations genomes inhibition, adaptation, recovery periods, we found DN could divided into three niche groups: type I (types Ia Ib) includes mainly II III include primarily bacteria. Type outcompeted other adaptation respectively. They were recognized as potential scavengers concentrations, contributing stabilizing concentration system. These findings shed light engineering solutions maintain robust efficient process.