Hydroxylamine addition enhances fast recovery of anammox activity suffering Cr(VI) inhibition

Feng, Fan; Tang, Xi; Qu, Caiyan; Lu, Xuan; Liu, Zhigong; Tang, Jianguo; Tang, Chong–Jian; Chai, Liyuan

doi:10.1016/j.biortech.2021.124920

Cited by 28 publications

(4 citation statements)

References 31 publications

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“…It is interesting that the accumulation of HA caused by the presence HO-1 bacteria triggered autoaggregation, autolysis, and biofilm formation by the V4 strain. Several recent studies suggested the importance of HA as a critical nitrogen metabolite in microbial interactions within microbial communities and engineered systems (Feng et al, 2021;Liu et al, 2021;Soler-Jofra et al, 2021;Zhao et al, 2021). However, the precise role of HA was poorly defined in these studies.…”

Section: Discussionmentioning

confidence: 99%

Alcaligenes ammonioxydans HO-1 antagonizes Bacillus velezensis via hydroxylamine-triggered population response

et al. 2022

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Antagonism is a common behavior seen between microbes in nature. Alcaligenes ammonioxydans HO-1 converts ammonia to nitrogen under aerobic conditions, which leads to the accumulation of extracellular hydroxylamine (HA), providing pronounced growth advantages against many bacterial genera, including Bacillus velezensis V4. In contrast, a mutant variant of A. ammonioxydans, strain 2-29, that cannot produce HA fails to antagonize other bacteria. In this article, we demonstrate that cell-free supernatants derived from the antagonistic HO-1 strain were sufficient to reproduce the antagonistic behavior and the efficiency of this inhibition correlated strongly with the HA content of the supernatant. Furthermore, reintroducing the capacity to produce HA to the 2-29 strain or supplementing bacterial co-cultures with HA restored antagonistic behavior. The HA-mediated antagonism was dose-dependent and affected by the temperature, but not by pH. HA caused a decline in biomass, cell aggregation, and hydrolysis of the cell wall in exponentially growing B. velezensis bulk cultures. Analysis of differential gene expression identified a series of genes modulating multicellular behavior in B. velezensis. Genes involved in motility, chemotaxis, sporulation, polypeptide synthesis, and non-ribosomal peptide synthesis were all significantly downregulated in the presence of HA, whereas autolysis-related genes showed upregulation. Taken together, these findings indicate that HA affects the population response of coexisting strains and also suggest that A. ammonioxydans HO-1 antagonize other bacteria by producing extracellular HA that, in turn, acts as a signaling molecule.

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Section: Discussionmentioning

confidence: 99%

Alcaligenes ammonioxydans HO-1 antagonizes Bacillus velezensis via hydroxylamine-triggered population response

et al. 2022

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“…Previous studies have confirmed extracellular Cr(VI) reduction in the Anammox system. 8,137 Anammox is an alkali-producing process, and thus, the precipitation of Cr(III) is intensified. 129 Additionally, EPS adsorption of Anammox biomass can protect cells from Cr entrance effectively and further lower Cr(III) concentrations.…”

Section: Mechanism Of Pyrite Alleviating Cr(vi)mentioning

confidence: 99%

How Pyrite Interacts with Anammox: Mechanisms and Application

Feng

Liu

et al. 2022

ACS EST Water

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Anaerobic ammonium oxidation (Anammox) is a promising biotechnology involving the nitrogen removal process owing to its benefits, such as high efficiency and low cost. However, problems are faced during its application, including long cell doubling time, sensitivity to environmental factors, and generation of nitrate as a byproduct. With the ability to promote bacterial growth and reduce the nitrate byproduct, pyrite (FeS2) has remarkable potential in enhancing the Anammox process. It will also expand the nitrogen removal pathway by coupling with the iron–nitrogen–sulfur cycle. Few pioneering studies on using pyrite for Anammox enhancement have been published recently, and critical information has yet to be summarized. This Review provides a comprehensive and systematic overview of the role of pyrite in the Anammox process. It offers the possibility of coupling pyrite with Anammox to achieve a more efficient nitrogen removal.

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“…This affects the nitrite‐oxidizing community and leads to NO 2 − accumulation (Li, Yan, et al, 2019; Soler‐Jofra et al, 2021). Feng et al (2021) and Wang et al (2020) observed the inhibition of the NOB community with the addition of NH 2 OH doses during the treatment of domestic wastewater, while nitrification was achieved efficiently, with a greater abundance of AOB than NOB.…”

Section: Practical Applications Of Key‐intermediate Metabolites For A...mentioning

confidence: 99%

“…This affects the nitrite-oxidizing community and leads to NO 2 À accumulation (Li, Yan, et al, 2019;Soler-Jofra et al, 2021). Feng et al (2021) and Wang et al (2020) observed the inhibition of the NOB community with the addition of NH 2 OH doses during the treatment of domestic wastewater, while nitrification was achieved efficiently, with a greater abundance of AOB than NOB. As a substrate or intermediate, NH 2 OH is a hot topic in the study of processes related to the N cycle (Soler-Jofra et al, 2020) once it can affect the community diversity and specific activity.…”

Section: Practical Applications Of Key-intermediate Metabolites For A...mentioning

confidence: 99%

Key enzymes involved in anammox‐based processes for wastewater treatment: An applied overview

Venturin

Rodrigues

Bonassa

et al. 2022

Water Environment Research

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Hydroxylamine addition enhances fast recovery of anammox activity suffering Cr(VI) inhibition

Cited by 28 publications

References 31 publications

Alcaligenes ammonioxydans HO-1 antagonizes Bacillus velezensis via hydroxylamine-triggered population response

Alcaligenes ammonioxydans HO-1 antagonizes Bacillus velezensis via hydroxylamine-triggered population response

How Pyrite Interacts with Anammox: Mechanisms and Application

Key enzymes involved in anammox‐based processes for wastewater treatment: An applied overview

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