The occurrence and role of Nitrospira in nitrogen removal systems

Mehrani, Mohamad-Javad; Sobotka, Dominika; Kowal, Przemysław; Ciesielski, Sławomir; Mąkinia, Jacek

doi:10.1016/j.biortech.2020.122936

Cited by 129 publications

(44 citation statements)

References 141 publications

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“…Similarly, Diaphorobacter nitroreducens Khan & Hiraishi, 2003, a denitrifying microorganism, is also an example of bacterium that has been previously isolated from activated sludge used in wastewater treatment (Khan & Hiairishi, 2002). Third such microorganism in our studied sample are aerobic, nitrite-oxidizing bacteria of genus Nitrospira which are abundant in various ecosystems such as wastewater treatment plants, freshwater, soils, groundwater and geothermal springs (Mehrani et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

The magic world of whiskey microbiota

Pristavec

Koren

Jeršek

et al. 2020

AAS

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<p>Modern metagenomics techniques in combination with next generation sequencing are increasingly used for research of numerous environments inhabited by diverse microbiota. In the present study we focused on a rather unusual environment for their growth, a forgotten bottle of blended Scotch whiskey. Whiskey is a world-known popular spirit, traditionally produced in a series of steps comprising malting of barley, fermenting the malt to an alcoholic wort, distilling and at least 3-year long maturation in oak casks, followed by filtration. In the process, notably in the fermentation, microorganisms play a crucial role. However, we were primarily interested in potential microbiological and chemical changes that might have taken place over the years while the half-empty whiskey bottle was left open. We found that only a very low number of aerobic mesophilic bacteria survived in it while the ethanol content decreased from 40 % to approximately 30 %. Interestingly, the metagenomics analysis showed there was a large and diverse microbial community present in the forgotten whiskey. Among the most abundant microorganisms were members of human commensal microbiota, some potentially disease-causing and also food spoiling bacteria, in particular genus <em>Pseudomonas</em>. Surprisingly, we even found a non-negligible number of typically environmental bacterial species.</p>

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Section: Discussionmentioning

confidence: 99%

The magic world of whiskey microbiota

Pristavec

Koren

Jeršek

et al. 2020

AAS

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“…However, the point of SRT could not be one major effect on Nitrospira but other factors: DO, temperature, ammonium in uent, pH, HRT, FA. ALR could also be the signi cant factors affecting the competition between Nitrospira and Nitrobacter [9].…”

Section: Nitrogen-cycling Microbial Abundances and Communitiesmentioning

confidence: 99%

“…Temperature at 10-20ºC was reported to be the optimum range for Nitrospira [8] and the temperature at 24-25ºC is favorable for Nitrobacter [7]. FA was an inhibitor of NOB activity [9]. Furthermore, Nitrobacter is more sensitive to FA than Nitrospira [10].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Nitrogen Removal Efficiencies and Microbial Communities of Full-Scale Anaerobic, Anoxic and Aerobic Processes in Municipal Wastewater Treatment Plants having Low and High COD/TN Ratios

Phanwilai

Noophan

et al. 2021

Preprint

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Full-scale anaerobic, anoxic and aerobic (A2O) process is used worldwide for biological nutrient removal (BNR). However, operation parameters for nitrogen removals and information of microbial communities related to nitrogen removal in full-scale A2O wastewater treatment plants (WWTPs) having low and high COD/TN ratios are not available. Based on the analysis of four full-scale A2O WWTPs, it is suggested that maintaining longer SRT of ≥ 30 day and DO of ≥ 0.9±0.2 mg-O2 L-1 is needed to improve nitrogen removal efficiency under low COD/TN ratio (≤ 3.7). On other hand, at high COD/TN ratio (≥ 4.2), DO level of ≥ 2.6 mg-O2 /L and typical SRT of 19‒ 25 days would be suggested. It was confirmed that phosphorus removal efficiency significantly improved under BOD/TP ratio of > 20 for A2O process in these full-scale WWTP. Microbial distribution analysis showed that ammonia-oxidizing archaea (AOA) was abundant under conditions of low DO level, longer SRT, high temperature and low COD/TN ratio (≤ 3.7). Nitrosomonas sp. are mostly found in aerobic tank of full-scale A2O WWTPs. However, abundances of Nitrosomonas sp. are proportional to DO and NH4+ concentrations for WWTPs with high COD/TN ratio. Nitrosospira sp. are only found under operating condition of longer SRT for WWTPs with low COD/TN ratio. Abundances of Nitrobacter sp. are proportional to DO concentration and temperature rather than abundance of Nitrospira sp. Predominance of nosZ-type denitrifiers were found at low COD/TN ratio. Abundance of denitrifiers by using nirS genes was over abundance of denitrifiers by using nirK genes at high COD/TN ratios WWTPs.

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“…The Effect of Bioaugmentation Strategy on the SBR Performance Treating Reject Water and Municipal Wastewater Under Various Temperature Conditions Aleksandra Szaja 1 , Joanna Szulżyk-Cieplak 2* nitrogen. Processes of nitrification and denitrification involve different groups of microorganisms and require different process conditions [Majtacz et al, 2017;Mehrani et The temperature is considered as a main parameter that can effect biological treatment [Metcalf and Eddy 2004]. Its fluctuation results from seasonal variations and industrial wastewater discharge.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Bioaugmentation Strategy on the SBR Performance Treating Reject Water and Municipal Wastewater under Various Temperature Conditions

Szaja¹,

Szulżyk-Cieplak²

2021

J. Ecol. Eng.

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In this study, the effect of bioaugmentation on the sequencing batch reactor (SBR) performance while treating municipal wastewater and reject water under various temperature conditions was examined. Two lab-scale SBRs, each with the active volume of 8 L were used to perform this research. For bioaugmentation, a mixture of wildliving Bacteria and Archaea in a dose 0.25 mL was added to SBR A, while SBR B was a control one. Both reactors were fed with a mixture of wastewater and 13% v/v reject water. During the experiment, 5 phases with different temperature range were distinguished, each one lasted 14 d. The temperatures were investigated in 5°C increments, i.e. 20, 25, 30, 25 and 20°C. The obtained results indicated that in the bioaugmented reactor (SBR A), lower concentrations of NH 4 + -N, TSS, NO 2 --N in effluent were observed as compared to control (SBR B). While for NH 4 + -N, regardless the temperature, the observed differences were statistically significant. Importantly, in both SBRs, the process was carried out in a stable way.

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The occurrence and role of Nitrospira in nitrogen removal systems

Cited by 129 publications

References 141 publications

The magic world of whiskey microbiota

The magic world of whiskey microbiota

Comparison of Nitrogen Removal Efficiencies and Microbial Communities of Full-Scale Anaerobic, Anoxic and Aerobic Processes in Municipal Wastewater Treatment Plants having Low and High COD/TN Ratios

The Effect of Bioaugmentation Strategy on the SBR Performance Treating Reject Water and Municipal Wastewater under Various Temperature Conditions

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