Anammox biofilm system under the stress of Hg(II): Nitrogen removal performance, microbial community dynamic and resistance genes expression

[Display omitted] •AAOB could completely resist Hg(II) in concentrations (≤ 10 mg L−1).•Hg(II) in 20 mg L−1 could lower the TNRE to approximately 55 %.•The secretion of EPS helped AAOB resist the invasion of Hg(II).•Hg(II) induced the amplification of merA, merB, merD and merR. The existence of heav...

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Published inJournal of hazardous materials Vol. 395; p. 122665
Main Authors Chen, Zhao, Zhang, Xiaojing, Ma, Yongpeng, Song, Yali, Li, Yingzhe, Geng, Guanglei, Huang, Yaning
Format Journal Article
LanguageEnglish
Published Netherlands Elsevier B.V 05.08.2020
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Abstract [Display omitted] •AAOB could completely resist Hg(II) in concentrations (≤ 10 mg L−1).•Hg(II) in 20 mg L−1 could lower the TNRE to approximately 55 %.•The secretion of EPS helped AAOB resist the invasion of Hg(II).•Hg(II) induced the amplification of merA, merB, merD and merR. The existence of heavy metals in wastewater has obtained more attention due to its high toxicity and non-degradability. In this study, we investigated the changes of anaerobic ammonium oxidation (Anammox) system under long-term invasion of Hg(Ⅱ). The results indicated that the total nitrogen removal efficiency (TNRE) dropped to around 55 % as Hg(Ⅱ) concentration went up to 20 mg L−1. But the functional bacteria rapidly developed some resistant abilities and maintained a stable TNRE of 65 % till the end of test. The maximum relative expression fold change of merA, merB, merD and merR were 468.8476, 23.7383, 5.0321 and 15.2514 times, respectively. The high positive correlation between the expression abundance of metal resistance genes and the concentrations of Hg(Ⅱ) revealed the resistant mechanisms of microorganisms to heavy metals. Moreover, the protective strategy based on extracellular polymeric substances also contributed to the stability of Anammox system.
AbstractList The existence of heavy metals in wastewater has obtained more attention due to its high toxicity and non-degradability. In this study, we investigated the changes of anaerobic ammonium oxidation (Anammox) system under long-term invasion of Hg(Ⅱ). The results indicated that the total nitrogen removal efficiency (TNRE) dropped to around 55 % as Hg(Ⅱ) concentration went up to 20 mg L-1. But the functional bacteria rapidly developed some resistant abilities and maintained a stable TNRE of 65 % till the end of test. The maximum relative expression fold change of merA, merB, merD and merR were 468.8476, 23.7383, 5.0321 and 15.2514 times, respectively. The high positive correlation between the expression abundance of metal resistance genes and the concentrations of Hg(Ⅱ) revealed the resistant mechanisms of microorganisms to heavy metals. Moreover, the protective strategy based on extracellular polymeric substances also contributed to the stability of Anammox system.The existence of heavy metals in wastewater has obtained more attention due to its high toxicity and non-degradability. In this study, we investigated the changes of anaerobic ammonium oxidation (Anammox) system under long-term invasion of Hg(Ⅱ). The results indicated that the total nitrogen removal efficiency (TNRE) dropped to around 55 % as Hg(Ⅱ) concentration went up to 20 mg L-1. But the functional bacteria rapidly developed some resistant abilities and maintained a stable TNRE of 65 % till the end of test. The maximum relative expression fold change of merA, merB, merD and merR were 468.8476, 23.7383, 5.0321 and 15.2514 times, respectively. The high positive correlation between the expression abundance of metal resistance genes and the concentrations of Hg(Ⅱ) revealed the resistant mechanisms of microorganisms to heavy metals. Moreover, the protective strategy based on extracellular polymeric substances also contributed to the stability of Anammox system.
The existence of heavy metals in wastewater has obtained more attention due to its high toxicity and non-degradability. In this study, we investigated the changes of anaerobic ammonium oxidation (Anammox) system under long-term invasion of Hg(Ⅱ). The results indicated that the total nitrogen removal efficiency (TNRE) dropped to around 55 % as Hg(Ⅱ) concentration went up to 20 mg L . But the functional bacteria rapidly developed some resistant abilities and maintained a stable TNRE of 65 % till the end of test. The maximum relative expression fold change of merA, merB, merD and merR were 468.8476, 23.7383, 5.0321 and 15.2514 times, respectively. The high positive correlation between the expression abundance of metal resistance genes and the concentrations of Hg(Ⅱ) revealed the resistant mechanisms of microorganisms to heavy metals. Moreover, the protective strategy based on extracellular polymeric substances also contributed to the stability of Anammox system.
The existence of heavy metals in wastewater has obtained more attention due to its high toxicity and non-degradability. In this study, we investigated the changes of anaerobic ammonium oxidation (Anammox) system under long-term invasion of Hg(Ⅱ). The results indicated that the total nitrogen removal efficiency (TNRE) dropped to around 55 % as Hg(Ⅱ) concentration went up to 20 mg L⁻¹. But the functional bacteria rapidly developed some resistant abilities and maintained a stable TNRE of 65 % till the end of test. The maximum relative expression fold change of merA, merB, merD and merR were 468.8476, 23.7383, 5.0321 and 15.2514 times, respectively. The high positive correlation between the expression abundance of metal resistance genes and the concentrations of Hg(Ⅱ) revealed the resistant mechanisms of microorganisms to heavy metals. Moreover, the protective strategy based on extracellular polymeric substances also contributed to the stability of Anammox system.
[Display omitted] •AAOB could completely resist Hg(II) in concentrations (≤ 10 mg L−1).•Hg(II) in 20 mg L−1 could lower the TNRE to approximately 55 %.•The secretion of EPS helped AAOB resist the invasion of Hg(II).•Hg(II) induced the amplification of merA, merB, merD and merR. The existence of heavy metals in wastewater has obtained more attention due to its high toxicity and non-degradability. In this study, we investigated the changes of anaerobic ammonium oxidation (Anammox) system under long-term invasion of Hg(Ⅱ). The results indicated that the total nitrogen removal efficiency (TNRE) dropped to around 55 % as Hg(Ⅱ) concentration went up to 20 mg L−1. But the functional bacteria rapidly developed some resistant abilities and maintained a stable TNRE of 65 % till the end of test. The maximum relative expression fold change of merA, merB, merD and merR were 468.8476, 23.7383, 5.0321 and 15.2514 times, respectively. The high positive correlation between the expression abundance of metal resistance genes and the concentrations of Hg(Ⅱ) revealed the resistant mechanisms of microorganisms to heavy metals. Moreover, the protective strategy based on extracellular polymeric substances also contributed to the stability of Anammox system.
ArticleNumber 122665
Author Ma, Yongpeng
Chen, Zhao
Huang, Yaning
Geng, Guanglei
Zhang, Xiaojing
Li, Yingzhe
Song, Yali
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Keywords Resistance
Anammox
Extracellular polymeric substances (EPS)
Hg(II)
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Heavy metals
Language English
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Snippet [Display omitted] •AAOB could completely resist Hg(II) in concentrations (≤ 10 mg L−1).•Hg(II) in 20 mg L−1 could lower the TNRE to approximately 55 %.•The...
The existence of heavy metals in wastewater has obtained more attention due to its high toxicity and non-degradability. In this study, we investigated the...
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SubjectTerms Ammonium Compounds
anaerobic ammonium oxidation
Anaerobiosis
Anammox
bacteria
biofilm
Biofilms
Bioreactors
Denitrification
Extracellular polymeric substances (EPS)
Genes
Heavy metals
Hg(II)
mercury
Mercury - toxicity
metal tolerance
microbial communities
Microbiota
nitrogen
Nitrogen - analysis
Oxidation-Reduction
polymers
Resistance
resistance genes
Sewage
total nitrogen
toxicity
wastewater
Title Anammox biofilm system under the stress of Hg(II): Nitrogen removal performance, microbial community dynamic and resistance genes expression
URI https://dx.doi.org/10.1016/j.jhazmat.2020.122665
https://www.ncbi.nlm.nih.gov/pubmed/32315795
https://www.proquest.com/docview/2393589436
https://www.proquest.com/docview/2439384524
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