Heterotrophic nitrification and aerobic denitrification at low nutrient conditions by a newly isolated bacterium, Acinetobacter sp. SYF26

Su, Jun feng; Zhang, Kai; Huang, Tinglin; Wen, Gang; Guo, Lin; Yang, Shao-fei

doi:10.1099/mic.0.000047

Cited by 84 publications

(19 citation statements)

References 29 publications

(29 reference statements)

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“…This result was consistence with the strain of Acinetobacter sp. CN86, in which the nitrate removal rate was lower slightly when the pH increased from 7.0 to 9.0 [ 43 ], but conflicted with another papers which reported that the nitrate reduction occurred under circumneutral pH or weak acidic conditions [ 44 , 45 ]. Compared with the degradation of nitrate, the value of pH arranging from 7.0 to 10.0 had no distinctively effect on total nitrogen removal ability of strain J with the removal percentage about 84.0%.…”

Section: Resultsmentioning

confidence: 99%

Removal of Nitrate in Simulated Water at Low Temperature by a Novel Psychrotrophic and Aerobic Bacterium, Pseudomonas taiwanensis Strain J

Sun

et al. 2018

BioMed Research International

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Low temperatures and high pH generally inhibit the biodenitrification. Thus, it is important to explore the psychrotrophic and alkali-resisting microorganism for degradation of nitrogen. This research was mainly focused on the identification of a psychrotrophic strain and preliminary explored its denitrification characteristics. The new strain J was isolated using the bromothymol blue solid medium and identified as Pseudomonas taiwanensis on the basis of morphology and phospholipid fatty acid as well as 16S rRNA gene sequence analyses, which is further testified to work efficiently for removing nitrate from wastewater at low temperature circumstances. This is the first report that Pseudomonas taiwanensis possessed excellent tolerance to low temperature, with 15°C as its optimum and 5°C as viable. The Pseudomonas taiwanensis showed unusual ability of aerobic denitrification with the nitrate removal efficiencies of 100% at 15°C and 51.61% at 5°C. Single factor experiments showed that the optimal conditions for denitrification were glucose as carbon source, 15°C, shaking speed 150 r/min, C/N 15, pH ≥ 7, and incubation quantity 2.0 × 106 CFU/mL. The nitrate and total nitrogen removal efficiencies were up to 100% and 93.79% at 15°C when glucose is served as carbon source. These results suggested that strain J had aerobic denitrification ability, as well as the notable ability to tolerate the low temperature and high pH.

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Section: Resultsmentioning

confidence: 99%

Removal of Nitrate in Simulated Water at Low Temperature by a Novel Psychrotrophic and Aerobic Bacterium, Pseudomonas taiwanensis Strain J

Sun

et al. 2018

BioMed Research International

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“…The advantages of heterotrophic nitrification are that nitrification and denitrification take place simultaneously at high organic loadings, and this simultaneous nitrification/denitrification helps to avoid acidification of the reactor (Chen and Ni 2011 ; Su et al 2015 ). Many microorganisms isolated from wastewater treatment systems, including Paracoccus denitrificans , Alcaligenes faecalis , Pseudomonas sp., Thauera sp., Rhodoferax ferrireducens , Rhodococcus sp.…”

Section: Resultsmentioning

confidence: 99%

Treatment of Ammonium-Rich Digestate from Methane Fermentation Using Aerobic Granular Sludge

Świątczak

Cydzik‐Kwiatkowska

2018

Water Air Soil Pollut

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Digestate produced by cofermentation of agricultural waste and manure can be difficult to dispose of because its high ammonium content impedes its use in agriculture due to generation of odor and overfertilization. This study investigated the possibility of treating such nitrogen-rich digestate with aerobic granular sludge depending on the nitrogen load in the reactor. At nitrogen loading rate of 1.0 g TN/(L·day), the nitrogen removal efficiency was high (64.9 ± 9.8%), ammonium nitrogen was completely oxidized, and nitrate was the main nitrification product. At nitrogen loading rate of 3.4 g TN/(L·day), ammonium oxidization was still good (93.6 ± 2.0%), but the percentage of partial nitrification was high (over 68%) and nitrogen removal efficiency worsened to 30.2 ± 2.6%. Despite this, the overall amount of nitrogen removed was 0.86 g TN/(L·day) and was over nearly two times higher than at the lower nitrogen loading rate. At both nitrogen loading rates, in the effluent nitrogen in a form of suspended solids predominated. To diminish the overall N loading in the effluent, treatment is therefore recommended enabling removal of solids, e.g., microfiltration, should be applied, or the digestate should be separated into solid and liquid phases, and only the liquid fraction should be subjected to biological treatment. At high N load in aerobic granules, a very versatile community of N-metabolizing microorganisms was present. More than 50% of all bacteria in aerobic granules were able to metabolize nitrogen, and the predominant genera (35%) was Thauera, which indicated that stable ammonium removal was achieved mostly as a result of heterotrophic nitrification.

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“…Unfortunately, many studies do not report the degree of aggregation of cells, for example while reporting so-called “aerobic denitrification” (Takaya et al, 2003, Robertson et al, 1989, Chen et al, 2003; Khardenavis et al, 2007; Su et al, 2015). Diffusion of oxygen towards single bacterial cells is so effective that with the reported cellular respiration rates, a single aerobic cell can never deplete all the oxygen in its immediate surroundings, unless the bulk oxygen concentration is in the low nanomolar range (Schulz & Jørgensen 2001; Stolper et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Impacts of chemical gradients on microbial community structure

et al. 2017

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Succession of redox processes is sometimes assumed to define a basic microbial community structure for ecosystems with oxygen gradients. In this paradigm, aerobic respiration, denitrification, fermentation and sulfate reduction proceed in a thermodynamically determined order, known as the ‘redox tower'. Here, we investigated whether redox sorting of microbial processes explains microbial community structure at low-oxygen concentrations. We subjected a diverse microbial community sampled from a coastal marine sediment to 100 days of tidal cycling in a laboratory chemostat. Oxygen gradients (both in space and time) led to the assembly of a microbial community dominated by populations that each performed aerobic and anaerobic metabolism in parallel. This was shown by metagenomics, transcriptomics, proteomics and stable isotope incubations. Effective oxygen consumption combined with the formation of microaggregates sustained the activity of oxygen-sensitive anaerobic enzymes, leading to braiding of unsorted redox processes, within and between populations. Analyses of available metagenomic data sets indicated that the same ecological strategies might also be successful in some natural ecosystems.

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Heterotrophic nitrification and aerobic denitrification at low nutrient conditions by a newly isolated bacterium, Acinetobacter sp. SYF26

Cited by 84 publications

References 29 publications

Removal of Nitrate in Simulated Water at Low Temperature by a Novel Psychrotrophic and Aerobic Bacterium, Pseudomonas taiwanensis Strain J

Removal of Nitrate in Simulated Water at Low Temperature by a Novel Psychrotrophic and Aerobic Bacterium, Pseudomonas taiwanensis Strain J

Treatment of Ammonium-Rich Digestate from Methane Fermentation Using Aerobic Granular Sludge

Impacts of chemical gradients on microbial community structure

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