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Denitrifying bacteria

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https://www.readbyqxmd.com/read/28343055/effects-of-porous-carrier-size-on-biofilm-development-microbial-distribution-and-nitrogen-removal-in-microaerobic-bioreactors
#1
Muhammad Ahmad, Sitong Liu, Nasir Mahmood, Asif Mahmood, Muhammad Ali, Maosheng Zheng, Jinren Ni
In this study, effects of porous carrier's size (polyurethane-based) on microbial characteristics were systematically investigated in addition to nitrogen removal performance in six microaerobic bioreactors. Among different sized carriers (50, 30, 20, 15,10, 5mm), 15mm carrier showed highest nitrogen removal (98%) due to optimal micro-environments created for aerobic nitrifiers in outer layer (0-7mm), nitrifiers and denitrifiers in middle layer (7-10mm) and anaerobic denitrifiers in inner layer (10-15mm). Candidatus brocadia, a dominant anammox bacteria, was solely concentrated close to centroid (0-70μm) and strongly co-aggregated with other bacterial communities in the middle layer of the carrier...
March 15, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28334274/interactive-effects-of-multiple-climate-change-factors-on-ammonia-oxidizers-and-denitrifiers-in-a-temperate-steppe
#2
Cuijing Zhang, Jupei Shen, Yifei Sun, Juntao Wang, Limei Zhang, Zhongling Yang, Hongyan Han, Shiqiang Wan, Jizheng He
Global climate change could have profound effects on belowground microbial communities and subsequently affect soil biogeochemical processes. The interactive effects of multiple co-occurring climate change factors on microbially-mediated processes are not well understood. A four-factorial field experiment with elevated CO2, watering, nitrogen (N) addition and night warming was conducted in a temperate steppe of northern China. Real-time polymerase chain reaction and terminal-restriction fragment length polymorphism, combined with clone library techniques were applied to examine the effects of those climate change factors on N-related microbial abundance and community composition...
March 15, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28330107/population-dynamics-of-soil-bacteria-in-some-areas-of-midnapore-coastal-belt-west-bengal-india
#3
Syed Afrin Azmi, Soumendranath Chatterjee
In this present study the population dynamics of the soil bacteria of some coastal villages, namely Padima, Jatimati, Chanpabani, Palsandapur, Bhagibaharampur, Duttapur, Gangadharpur, Gobindabasan, Somaibasan of Digha, West Bengal, India, was determined. In these villages the aerobic heterotrophic, Gram-negative, spore-forming, starch-hydrolyzing, Pseudomonas, nitrate-reducing, denitrifying, asymbiotic N2 fixing, nitrifying, phosphate-solubilizing bacterial populations ranged from 1.22 to 2.67 × 10(6), 0...
June 2016: 3 Biotech
https://www.readbyqxmd.com/read/28326437/steady-state-oxygen-isotope-effects-of-n2o-production-in-paracoccus-denitrificans
#4
Carol Barford, Joseph Montoya, Mark Altabet, Ralph Mitchell
Knowledge of isotopic discrimination, or fractionation, by denitrifying bacteria can benefit agricultural fertilizer management, wastewater treatment, and other applications. However, the complexity of N transformation pathways in the environment and the sensitivity of denitrification to environmental conditions warrant better isotopic distinction between denitrification and other processes, especially for oxygen isotopes. Here, we present a dataset of δ(18)O measurements in continuous culture of Paracoccus denitrificans...
March 21, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28324256/legacy-effects-of-simulated-short-term-climate-change-on-ammonia-oxidisers-denitrifiers-and-nitrous-oxide-emissions-in-an-acid-soil
#5
Xiaoya Xu, Xiaorui Liu, Yong Li, Yu Ran, Yapeng Liu, Qichun Zhang, Zheng Li, Yan He, Jianming Xu, Hongjie Di
Although the effect of simulated climate change on nitrous oxide (N2O) emissions and on associated microbial communities has been reported, it is not well understood if these effects are short-lived or long-lasting. Here, we conducted a field study to determine the interactive effects of simulated warmer and drier conditions on nitrifier and denitrifier communities and N2O emissions in an acidic soil and the longevity of the effects. A warmer (+2.3 °C) and drier climate (-7.4% soil moisture content) was created with greenhouses...
March 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28321487/benzene-degradation-in-a-denitrifying-biofilm-reactor-activity-and-microbial-community-composition
#6
Marcelle J van der Waals, Siavash Atashgahi, Ulisses Nunes da Rocha, Bas M van der Zaan, Hauke Smidt, Jan Gerritse
Benzene is an aromatic compound and harmful for the environment. Biodegradation of benzene can reduce the toxicological risk after accidental or controlled release of this chemical in the environment. In this study, we further characterized an anaerobic continuous biofilm culture grown for more than 14 years on benzene with nitrate as electron acceptor. We determined steady state degradation rates, microbial community composition dynamics in the biofilm, and the initial anaerobic benzene degradation reactions...
March 20, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28316045/nitrogen-removal-and-microbial-community-shift-in-an-aerobic-denitrification-reactor-bioaugmented-with-a-pseudomonas-strain-for-coal-based-ethylene-glycol-industry-wastewater-treatment
#7
Cong Du, Chong-Wei Cui, Shan Qiu, Sheng-Nan Shi, Ang Li, Fang Ma
An aerobic denitrification system, initially bioaugmented with Pseudomonas strain T13, was established to treat coal-based ethylene glycol industry wastewater, which contained 3219 ± 86 mg/L total nitrogen (TN) and 1978 ± 14 mg/L NO3(-)-N. In the current study, a stable denitrification efficiency of 53.7 ± 4.7% and nitrite removal efficiency of 40.1 ± 2.7% were achieved at different diluted influent concentrations. Toxicity evaluation showed that a lower toxicity of effluent was achieved when industry wastewater was treated by stuffing biofilm communities compared to suspended communities...
March 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28299401/sodium-lauryl-ether-sulfate-sles-degradation-by-nitrate-reducing-bacteria
#8
Ana M S Paulo, Rozelin Aydin, Mauricio R Dimitrov, Harm Vreeling, Ana J Cavaleiro, Pedro A García-Encina, Alfons J M Stams, Caroline M Plugge
The surfactant sodium lauryl ether sulfate (SLES) is widely used in the composition of detergents and frequently ends up in wastewater treatment plants (WWTPs). While aerobic SLES degradation is well studied, little is known about the fate of this compound in anoxic environments, such as denitrification tanks of WWTPs, nor about the bacteria involved in the anoxic biodegradation. Here, we used SLES as sole carbon and energy source, at concentrations ranging from 50 to 1000 mg L(-1), to enrich and isolate nitrate-reducing bacteria from activated sludge of a WWTP with the anaerobic-anoxic-oxic (A(2)/O) concept...
March 15, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28296352/the-role-of-inoculum-and-reactor-configuration-for-microbial-community-composition-and-dynamics-in-mainstream-partial-nitritation-anammox-reactors
#9
Shelesh Agrawal, Søren M Karst, Eva M Gilbert, Harald Horn, Per H Nielsen, Susanne Lackner
Implementation of partial nitritation anammox (PNA) in the mainstream (municipal wastewater treatment) is still under investigation. Microbial community structure and reactor type can influence the performance of PNA reactor; yet, little is known about the role of the community composition of the inoculum and the reactor configuration under mainstream conditions. Therefore, this study investigated the community structure of inocula of different origin and their consecutive community dynamics in four different lab-scale PNA reactors with 16S rRNA gene amplicon sequencing...
March 10, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28281565/changes-in-land-use-driven-by-urbanization-impact-nitrogen-cycling-and-the-microbial-community-composition-in-soils
#10
Haitao Wang, Christopher W Marshall, Minying Cheng, Huijuan Xu, Hu Li, Xiaoru Yang, Tianling Zheng
Transition of populations from rural to urban living causes landscape changes and alters the functionality of soil ecosystems. It is unclear how this urbanization disturbs the microbial ecology of soils and how the disruption influences nitrogen cycling. In this study, microbial communities in turfgrass-grown soils from urban and suburban areas around Xiamen City were compared to microbial communities in the soils from rural farmlands. The potential N2O emissions, potential denitrification activity, and abundances of denitrifiers were higher in the rural farmland soils compared with the turfgrass soils...
March 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28249188/impact-of-electro-stimulation-on-denitrifying-bacterial-growth-and-analysis-of-bacterial-growth-kinetics-using-a-modified-gompertz-model-in-a-bio-electrochemical-denitrification-reactor
#11
Hengyuan Liu, Nan Chen, Chuanping Feng, Shuang Tong, Rui Li
This study aimed to investigate the effect of electro-stimulation on denitrifying bacterial growth in a bio-electrochemical reactor, and the growth were modeled using modified Gompertz model under different current densities at three C/Ns. It was found that the similar optimum current density of 250mA/m(2) was obtained at C/N=0.75, 1.00 and 1.25, correspondingly the maximum nitrate removal efficiencies were 98.0%, 99.2% and 99.9%. Moreover, ATP content and cell membrane permeability of denitrifying bacteria were significantly increased at optimum current density...
February 20, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28238639/enhanced-performance-of-denitrifying-sulfide-removal-process-at-high-carbon-to-nitrogen-ratios-under-micro-aerobic-condition
#12
Chuan Chen, Ruo-Chen Zhang, Xi-Jun Xu, Ning Fang, Ai-Jie Wang, Nan-Qi Ren, Duu-Jong Lee
The success of denitrifying sulfide removal (DSR) processes, which simultaneously degrade sulfide, nitrate and organic carbon in the same reactor, counts on synergetic growths of autotrophic and heterotrophic denitrifiers. Feeding wastewaters at high C/N ratio would stimulate overgrowth of heterotrophic bacteria in the DSR reactor so deteriorating the growth of autotrophic denitrifiers. The DSR tests at C/N=1.26:1, 2:1 or 3:1 and S/N =5:6 or 5:8 under anaerobic (control) or micro-aerobic conditions were conducted...
February 11, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28235661/hollow-fiber-membrane-bioreactor-affects-microbial-community-and-morphology-of-the-damo-and-anammox-co-culture-system
#13
Liang Fu, Jing Ding, Yong-Ze Lu, Zhao-Wei Ding, Ya-Nan Bai, Raymond J Zeng
Denitrifying anaerobic methane oxidation (DAMO) and Anammox co-culture system was investigated in hollow fiber membrane bioreactor (HfMBR) for the change of microbial community morphology and proportion. NO3(-)-N and NH4(+)-N removal rates reached 85.33 and 37.95mg/L/d on 193d. The inoculum microorganisms were flocs and the proportion of DAMO archaea, DAMO bacteria and Anammox bacteria was 11.0, 24.2 and 0.4%, respectively, but it changed to 74.3, 11.8, 5.6% in HfMBR, respectively. Interestingly, microorganisms formed biofilms on fibers surface and the biofilms included two layers: inner layer was thin and dominated by DAMO bacteria and Anammox bacteria; while the outer layer was thick made up of granules with 100-200μm diameter and dominated by DAMO archaea...
February 14, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28214907/a-pilot-study-of-bacterial-regrowth-in-water-pipelines
#14
Laura Mancini, Stefania Marcheggiani, Cinzia Grasso, Cristina Romanelli, Antonio Mistretta, Marina Marranzano
Bacterial regrowth in water distribution systems results in deterioration of bacteriological quality of drinking water, as well as accelerated corrosion of the pipelines. The aim of the present study was to analyze the phenomena of colonization and bacterial regrowth in source water and in the water distribution systems of three distribution networks in the province of Catania (Sicily, Italy). The BART™ (Biological Activity Reaction Test) method was used, which is also capable of determining the potential aggressiveness of microbial species in water...
November 2016: Igiene e Sanità Pubblica
https://www.readbyqxmd.com/read/28194258/complete-genome-sequence-of-pseudomonas-stutzeri-strain-rch2-isolated-from-a-hexavalent-chromium-cr-vi-contaminated-site
#15
Romy Chakraborty, Hannah Woo, Paramvir Dehal, Robert Walker, Marcin Zemla, Manfred Auer, Lynne A Goodwin, Alexey Kazakov, Pavel Novichkov, Adam P Arkin, Terry C Hazen
Hexavalent Chromium [Cr(VI)] is a widespread contaminant found in soil, sediment, and ground water in several DOE sites, including Hanford 100 H area. In order to stimulate microbially mediated reduction of Cr(VI) at this site, a poly-lactate hydrogen release compound was injected into the chromium contaminated aquifer. Targeted enrichment of dominant nitrate-reducing bacteria post injection resulted in the isolation of Pseudomonas stutzeri strain RCH2. P. stutzeri strain RCH2 was isolated using acetate as the electron donor and is a complete denitrifier...
2017: Standards in Genomic Sciences
https://www.readbyqxmd.com/read/28192724/enhancing-ammonium-oxidizing-bacteria-activity-was-key-to-single-stage-partial-nitrification-anammox-system-treating-low-strength-sewage-under-intermittent-aeration-condition
#16
Yuanyuan Miao, Liang Zhang, Baikun Li, Qian Zhang, Simeng Wang, Yongzhen Peng
Intermittent aeration and bio-augmentation were integrated to enhance single-stage partial nitrification-anammox (SPN/A) stability over 235-day operational period treating low-strength sewage. The effect of bio-augmentation sludge (with different abundances of ammonium oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB)) was determined. Partial nitrification sludge based bio-augmentation increased the total nitrogen (TN) removal efficiency from 29.1% to 70%, followed by the nitrification sludge (from 38...
May 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28192347/predicting-n2o-emissions-from-nitrifying-and-denitrifying-biofilms-a-modeling-study
#17
Fabrizio Sabba, Cristian Picioreanu, Joshua P Boltz, Robert Nerenberg
Wastewater treatment plants can be significant sources of nitrous oxide (N2O), a potent greenhouse gas. While our understanding of N2O emissions from suspended-growth processes has advanced significantly, less is known about emissions from biofilm processes. Biofilms may behave differently due to their substrate gradients and microbial stratification. In this study, we used mathematical modeling to explore the mechanisms of N2O emissions from nitrifying and denitrifying biofilms. Our ammonia-oxidizing bacteria biofilm model suggests that N2O emissions from biofilm can be significantly greater than from suspended-growth systems...
February 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28187386/simultaneous-domestic-wastewater-and-nitrate-sewage-treatment-by-denitrifying-ammonium-oxidation-deamox-in-sequencing-batch-reactor
#18
Rui Du, Shenbin Cao, Baikun Li, Shuying Wang, Yongzhen Peng
A novel DEAMOX system was developed for nitrogen removal from domestic wastewater and nitrate (NO3(-)-N) sewage in sequencing batch reactor (SBR). High nitrite (NO2(-)-N) was produced from NO3(-)-N reduction in partial-denitrification process, which served as electron acceptor for anammox and was removed with ammonia (NH4(+)-N) in domestic wastewater simultaneously. A 500-days operation demonstrated that the efficient and stable nitrogen removal performance could be achieved by DEAMOX. The total nitrogen (TN) removal efficiency was as high as 95...
May 2017: Chemosphere
https://www.readbyqxmd.com/read/28185734/arsenic-behavior-in-different-biogeochemical-zonations-approximately-along-the-groundwater-flow-path-in-datong-basin-northern-china
#19
Junwen Zhang, Teng Ma, Liang Feng, Yani Yan, Olusegun K Abass, Zhiqiang Wang, Huawei Cai
Studies have shown that arsenic is desorbed/released into groundwater as a result of bacterial reduction of As(V) and Fe(III). However, bacterial activities like sulfate reduction process can also reduce the content of arsenic in groundwater. In this study, we examined the effects of different biogeochemical processes (e.g. NO3(-) and SO4(2-) reduction) on arsenic, by investigating the chemical characteristics and bacterial community structure of groundwater in the Datong Basin, northern China. Along the groundwater flow path, arsenic concentration increased from <1 to 947...
April 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28168315/nitrogen-source-effects-on-the-denitrifying-anaerobic-methane-oxidation-culture-and-anaerobic-ammonium-oxidation-bacteria-enrichment-process
#20
Liang Fu, Jing Ding, Yong-Ze Lu, Zhao-Wei Ding, Raymond J Zeng
The co-culture system of denitrifying anaerobic methane oxidation (DAMO) and anaerobic ammonium oxidation (Anammox) has a potential application in wastewater treatment plant. This study explored the effects of permutation and combination of nitrate, nitrite, and ammonium on the culture enrichment from freshwater sediments. The co-existence of NO3(-), NO2(-), and NH4(+) shortened the enrichment time from 75 to 30 days and achieved a total nitrogen removal rate of 106.5 mg/L/day on day 132. Even though ammonium addition led to Anammox bacteria increase and a higher nitrogen removal rate, DAMO bacteria still dominated in different reactors with the highest proportion of 64...
February 6, 2017: Applied Microbiology and Biotechnology
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