Weak magnetic field: A powerful strategy to enhance partial nitrification

Wang, Zhibin; Liu, Xiaolin; Ni, Shou-Qing; Zhang, Jian; Zhang, Xu; Ahmad, Hafiz Adeel; Gao, Baoyu

doi:10.1016/j.watres.2017.04.058

Cited by 96 publications

(30 citation statements)

References 43 publications

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“…The obviously higher expression of cell motility in HN coupled to that of signal transduction, which agreed with previous report. 24 This further supported microbial response to ammonia by behaviors or movements. Unexpectedly, in HN only the expression of energy metabolism was depressed, but other pathways had higher expressions compared to that in LN ( Fig.…”

Section: Discussionmentioning

confidence: 68%

Ammonia determines transcriptional profile of microorganisms in anaerobic digestion

Zhang

Peng

et al. 2018

Brazilian Journal of Microbiology

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Anaerobic digestion is important for the management of livestock manure with high ammonia level. Although ammonia effects on anaerobic digestion have been comprehensively studied, the molecular mechanism underlying ammonia inhibition still remains elusive. In this study, based on metatranscriptomic analysis, the transcriptional profile of microbial community in anaerobic digestion under low (1500 mg L−1) and high NH4+ (5000 mg L−1) concentrations, respectively, were revealed. The results showed that high NH4+ concentrations significantly inhibited methane production but facilitated the accumulations of volatile fatty acids. The expression of methanogenic pathway was significantly inhibited by high NH4+ concentration but most of the other pathways were not significantly affected. Furthermore, the expressions of methanogenic genes which encode acetyl-CoA decarbonylase and methyl-coenzyme M reductase were significantly inhibited by high NH4+ concentration. The inhibition of the co-expressions of the genes which encode acetyl-CoA decarbonylase was observed. Some genes involved in the pathways of aminoacyl-tRNA biosynthesis and ribosome were highly expressed under high NH4+ concentration. Consequently, the ammonia inhibition on anaerobic digestion mainly focused on methanogenic process by suppressing the expressions of genes which encode acetyl-CoA decarbonylase and methyl-coenzyme M reductase. This study improved the accuracy and depth of understanding ammonia inhibition on anaerobic digestion.

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Section: Discussionmentioning

confidence: 68%

Ammonia determines transcriptional profile of microorganisms in anaerobic digestion

Zhang

Peng

et al. 2018

Brazilian Journal of Microbiology

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“…PCoA was performed on the weighted UniFrac phylogenetic distance matrices using R statistical software ( http://www.r-project.org/ ) to visualize differences in microbial community compositions. The two-sided Chi-square test with DP, asymptotic with CC CI method, and fdr multiple test correction were conducted to identify significant differences between bacterial relative abundances in samples before and after foaming using STAMP software 54 .…”

Section: Methodsmentioning

confidence: 99%

Investigation of foaming causes in three mesophilic food waste digesters: reactor performance and microbial analysis

Zhao

et al. 2017

Sci Rep

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Foaming negatively affects anaerobic digestion of food waste (FW). To identify the causes of foaming, reactor performance and microbial community dynamics were investigated in three mesophilic digesters treating FW. The digesters were operated under different modes, and foaming was induced with several methods. Proliferation of specific bacteria and accumulation of surface active materials may be the main causes of foaming. Volatile fatty acids (VFAs) and total ammonia nitrogen (TAN) accumulated in these reactors before foaming, which may have contributed to foam formation by decreasing the surface tension of sludge and increasing foam stability. The relative abundance of acid-producing bacteria (Petrimonas, Fastidiosipila, etc.) and ammonia producers (Proteiniphilum, Gelria, Aminobacterium, etc.) significantly increased after foaming, which explained the rapid accumulation of VFAs and NH4 + after foaming. In addition, the proportions of microbial genera known to contribute to foam formation and stabilization significantly increased in foaming samples, including bacteria containing mycolic acid in cell walls (Actinomyces, Corynebacterium, etc.) and those capable of producing biosurfactants (Corynebacterium, Lactobacillus, 060F05-B-SD-P93, etc.). These findings improve the understanding of foaming mechanisms in FW digesters and provide a theoretical basis for further research on effective suppression and early warning of foaming.

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“…But the ultimate application of these technologies is oriented to the aquatic ecosystem, although not at present. Nevertheless, the mechanisms of how WMF and low-frequency EMF influence on living systems are seldom discussed as well as no commonly accepted models regarding to the biological effect [7,45,64,68,71,80]. Therefore, it is of great significance to explore whether WMF affects the doseresponse relationship of environmental pollutants and its toxic effects.…”

Section: Introductionmentioning

confidence: 99%

The weak magnetic field (WMF) enhances the stimulation of polymyxin B sulfate (POL) on Vibrio qinghaiensis sp.-Q67

Wang

et al. 2020

Environ Sci Eur

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Background: The weak magnetic field (WMF) can enhance the ability to remove target pollutants in wastewater, which drives us to consider whether WMF could give rise to the hormesis or not. In our previous study, it was found that polymyxin B sulfate (POL) can induce weak hormesis on Vibrio qinghaiensis sp.-Q67 (Q67). To this end, we set up four different WMF treatments during Q67 culture and POL exposure process, having no WMF in all cases (NW), adding WMF all the time (AW), exerting WMF only during the bacterial culture (BW), and exerting WMF only in POL exposure period (EW). Results: It was shown that the concentration-response curves (CRCs) of POL in four WMF treatments at the exposure times of 6, 9, and 12 h are non-monotonic hormetic curves where the maximum stimulative effects (E min) of POL in BW and EW are obviously larger than those in AW and NW. The maximum E min is 26.8% occurring in EW and 20.7% in BW at 6 h, while the max E min is 14.6% in NW at 9 h, it means that stimulations of POL in BW and EW are earlier and stronger than those in NW. These findings first indicated that WMF can enhance the hormesis of POL. Conclusions: This study showed that WMF as a key factor may influence the maximum stimulation effect of hormesis. The characteristic of biphasic (hormetic effect) challenges the traditional classical threshold model that is close to chemical risk assessment. But the mechanism of hormesis even now is inconclusive. WMF as a novelty and neglected factor has the potential to support the further development of hormesis mechanism.

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Weak magnetic field: A powerful strategy to enhance partial nitrification

Cited by 96 publications

References 43 publications

Ammonia determines transcriptional profile of microorganisms in anaerobic digestion

Ammonia determines transcriptional profile of microorganisms in anaerobic digestion

Investigation of foaming causes in three mesophilic food waste digesters: reactor performance and microbial analysis

The weak magnetic field (WMF) enhances the stimulation of polymyxin B sulfate (POL) on Vibrio qinghaiensis sp.-Q67

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