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Denitrifying bacteria

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https://www.readbyqxmd.com/read/28634714/microbial-community-shift-in-a-suspended-stuffing-biological-reactor-with-pre-attached-aerobic-denitrifier
#1
Cong Du, Chongwei Cui, Shan Qiu, Shanwen Xu, Shengnan Shi, Thangavel Sangeetha, Fang Ma
Bioaugmentation is substantially determined by pre-attached communities in biological stuffing systems. However, the inevitable changes of microbial community shift occurred between pre-attached microorganisms on stuffing material and other existing communities in wastewater. Targeting at nitrogen removal in aerobic denitrification reactors, biological augmentation was built by polyurethane supporting material and aerobic denitrification bacteria of Pseudomonas stutzeri strains were primarily colonized. The total nitrogen removal reached a high efficiency of 77 ± 6%, resulting from a relative high nitrate removal (90%) and a low nitrite production of 24 mg l(-1)...
July 2017: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28634638/co-existence-of-anaerobic-ammonium-oxidation-bacteria-and-denitrifying-anaerobic-methane-oxidation-bacteria-in-sewage-sludge-community-diversity-and-seasonal-dynamics
#2
Sai Xu, Wenjing Lu, Muhammad Farooq Mustafa, Luis Miguel Caicedo, Hanwen Guo, Xindi Fu, Hongtao Wang
Anaerobic ammonium oxidation (ANAMMOX) and denitrifying anaerobic methane oxidation (DAMO) have been recently discovered as relevant processes in the carbon and nitrogen cycles of wastewater treatment plants. In this study, the seasonal dynamics of ANAMMOX and DAMO bacterial community structures and their abundance in sewage sludge collected from wastewater treatment plants were analysed. Results indicated that ANAMMOX and DAMO bacteria co-existed in sewage sludge in different seasons and their abundance was positively correlated (P < 0...
June 20, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28628989/pollutant-removal-and-microorganism-evolution-of-activated-sludge-under-ofloxacin-selection-pressure
#3
Qiang Kong, Xiao He, Yu Feng, Ming-Sheng Miao, Qian Wang, Yuan-da Du, Fei Xu
An activated sludge sequencing batch reactor (SBR) was fed with synthetic wastewater containing ofloxacin (OFL) for 52days to study the overall performance of the SBR, the characteristics of extracellular polymeric substances (EPS) and the bacterial community shift. Removal efficiencies of chemical oxygen demand, ammonia nitrogen, phosphorus and OFL were maintained at 90%, 96%, 80% and 65%, respectively. The EPS contents increased with increasing OFL concentration because more EPS was secreted to protect cells from OFL damage...
June 14, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28593806/a-nitrogen-removal-system-to-limit-water-exchange-for-recirculating-freshwater-aquarium-using-dhs-usb-reactor
#4
Nur Adlin, Norihisa Matsuura, Yuki Ohta, Yuga Hirakata, Shinya Maki, Masashi Hatamoto, Takashi Yamaguchi
This study proposes a biological nitrogen removal system for freshwater aquaria consisting of a down-flow hanging sponge (DHS) and an up-flow sludge blanket (USB). DHS-USB systems can perform nitrification and denitrification simultaneously, reducing ammonia (NH3) and nitrate (NO3(-)) toxicity in the water. The performance of the system was evaluated using on-site fresh water aquaria at ambient temperature (23-34°C) over 192 days. NH3 and nitrite (NO2(-)) were maintained at a detection limit of 0.01 mg N L(-1) and NO3(-) was maintained below 10 mg N L(-1), despite limited water exchange...
June 13, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28562229/effect-of-chromium-vi-on-the-multiple-nitrogen-removal-pathways-and-microbial-community-of-aerobic-granular-sludge
#5
Xiao-Ying Zheng, Dan Lu, Ming-Yang Wang, Wei Chen, Gan Zhou, Yuan Zhang
The frequent appearance of Cr(VI) significantly impacts the microbial metabolism in wastewater. In this study, long-term effects of Cr(VI) on microbial community, nitrogen removal pathways and mechanism of aerobic granular sludge (AGS) were investigated. AGS had strong resistance ability to 1.0 mg/L Cr(VI). 3.0 mg/L Cr(VI) increased the heterotrophic-specific ammonia uptake rate (HSAUR) and heterotrophic-specific nitrate uptake rate (HSNUR) transiently, whereas 5.0 mg/L Cr(VI) sharply decreased the specific ammonia uptake rate (SAUR), specific nitrate uptake rate (SNUR) and simultaneous nitrification denitrification rate (SNDR)...
June 12, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28556299/use-of-oxygen-isotopes-to-differentiate-between-nitrous-oxide-produced-by-fungi-or-bacteria-during-denitrification
#6
Lena Rohe, Reinhard Well, Dominika Lewicka-Szczebak
RATIONALE: Fungal denitrifiers can contribute substantially to N2 O emissions from arable soil and show a distinct site preference for N2 O (SP(N2 O)). This study sought to identify another process-specific isotopic tool to improve precise identification of N2 O of fungal origin by mass spectrometric analysis of the N2 O produced. METHODS: Three pure bacterial and three fungal species were incubated under denitrifying conditions in treatments with natural abundance and stable isotope labelling to analyse the N2 O produced...
May 27, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28554256/integration-of-methane-removal-in-aerobic-anammox-based-granular-sludge-reactors
#7
Celia M Castro-Barros, Long T Ho, Mari K H Winkler, Eveline I P Volcke
Combined partial nitritation-anaerobic ammonium oxidation (anammox) processes have been widely applied for nitrogen removal from anaerobic digestion reject water. However, such streams also contain dissolved methane that can escape to the atmosphere, hence contributing to global warming. This study investigates the possibility of integrating methane removal in aerobic anammox-based granular sludge reactors, through modelling and simulation. Methane removal could be established through aerobic methane-oxidizing bacteria (MOB), denitrifying anaerobic methane-oxidizing bacteria (damoB, NO2(-) + CH4à N2 + CO2), and/or archaea (damoA, NO3(-) + CH4à NO2(-) + CO2)...
June 8, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28544987/a-high-efficiency-denitrification-bioreactor-for-the-treatment-of-acrylonitrile-wastewater-using-waterborne-polyurethane-immobilized-activated-sludge
#8
Honghong Dong, Wei Wang, Zhaozheng Song, Hao Dong, Jianfeng Wang, Shanshan Sun, Zhongzhi Zhang, Ming Ke, Zhenjia Zhang, Wei-Min Wu, Guangqing Zhang, Jie Ma
The performance of a laboratory-scale, high-efficiency denitrification bioreactor (15L) using activated sludge immobilized by waterborne polyurethane in treating acrylonitrile wastewater with high concentration of nitrate nitrogen (249mg/L) was investigated. The bioreactor was operated at 30°C for 220days. Batch denitrification experiments showed that the optimal operation parameters were C/NO3(-)-N molar ratio of 2.0 using sodium acetate as electron donor and carrier filling rate of 20% (V/V) in the bioreactor...
September 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28540925/microorganisms-and-ocean-global-change
#9
REVIEW
David A Hutchins, Feixue Fu
The prokaryotic and eukaryotic microorganisms that drive the pelagic ocean's biogeochemical cycles are currently facing an unprecedented set of comprehensive anthropogenic changes. Nearly every important control on marine microbial physiology is currently in flux, including seawater pH, pCO2, temperature, redox chemistry, irradiance and nutrient availability. Here, we examine how microorganisms with key roles in the ocean carbon and nitrogen cycles may respond to these changes in the Earth's largest ecosystem...
May 25, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28534126/optimization-of-continuous-flow-solid-phase-denitrification-via-coupling-carriers-in-enhancing-simultaneous-removal-of-nitrogen-and-organics-for-agricultural-runoff-purification
#10
Yi Lu, Xiaoqing Zhang, Lijuan Feng, Guangfeng Yang, Zhou Zheng, Junzhi Liu, Jun Mu
Coupling of biodegradable corncob and plastic carrier was optimized in continuous-flow solid-phase denitrification systems for enhancing simultaneously removal of nitrogen and organics in agricultural runoff. In compared with preposition of plastic carriers and mixed distribution method, it was demonstrated that the preposition of corncobs simultaneously enhanced nitrate (6.64 ± 1.35 mg L(-1) day (-1)) and organics removal (6.33 ± 1.44 mg L(-1) day(-1)) at a hydraulic retention time (HRT) of 6 h...
May 22, 2017: Biodegradation
https://www.readbyqxmd.com/read/28533063/photosynthetic-bacteria-based-membrane-bioreactor-as-post-treatment-of-an-anaerobic-membrane-bioreactor-effluent
#11
E González, O Díaz, I Ruigómez, C R de Vera, L E Rodríguez-Gómez, J Rodríguez-Sevilla, L Vera
Anaerobic membrane bioreactors have attracted increasing interest in the field of wastewater treatment. However, significant amounts of organic matter, nitrogen and sulphide in the effluent may limit its reuse. A photosynthetic bacteria-based membrane bioreactor is proposed for the further treatment of this effluent. A pilot-scale unit was run outdoor for over 900h to assess the process performance at short hydraulic retention time. After an initial biomass development, simultaneous removal of soluble organic matter and nitrogen was achieved (65% and 39%, respectively)...
September 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28531853/methane-production-in-an-anaerobic-osmotic-membrane-bioreactor-using-forward-osmosis-effect-of-reverse-salt-flux
#12
Sheng Li, Youngjin Kim, Sherub Phuntsho, Laura Chekli, Ho Kyong Shon, TorOve Leiknes, Noreddine Ghaffour
This study investigated the impact of reverse salt flux (RSF) on microbe community and bio-methane production in a simulated fertilizer driven FO-AnMBR system using KCl, KNO3 and KH2PO4 as draw solutes. Results showed that KH2PO4 exhibited the lowest RSF in terms of molar concentration 19.1mM/(m(2).h), while for KCl and KNO3 it was 32.2 and 120.8mM/(m(2).h), respectively. Interestingly, bio-methane production displayed an opposite order with KH2PO4, followed by KCl and KNO3. Pyrosequencing results revealed the presence of different bacterial communities among the tested fertilizers...
September 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28517029/carbon-driven-enrichment-of-the-crucial-nitrate-reducing-bacteria-in-limed-peat-soil-microcosms
#13
Ying Zhu, Xiaoyuan Zhang, Xiaogang Wu, Guanzhou Chen, Lars R Bakken, Liping Zhao, Åsa Frostegård, Xiaojun Zhang
Bacteria of Dechloromonas were recognized as potential functional important denitrifiers in a long term shell sand amended peat soil. Different microcosms in a solid matrix and slurry systems with the addition of carbon and nitrogen sources, e.g., clover leaves, glutamate, and nitrate, were established. The bacterial community structures were analyzed by pyrosequencing of the 16S rRNA gene to select the conditions for enriching bacteria of Dechloromonas. The results showed that a relatively even bacterial community in the initial soil shifted to communities dominated by a few types of nitrate reducing bacteria after the incubation, which strongly responded to the carbon substrates addition and consumption...
May 18, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28507540/microbial-population-dynamics-and-ecosystem-functions-of-anoxic-aerobic-granular-sludge-in-sequencing-batch-reactors-operated-at-different-organic-loading-rates
#14
Enikö Szabó, Raquel Liébana, Malte Hermansson, Oskar Modin, Frank Persson, Britt-Marie Wilén
The granular sludge process is an effective, low-footprint alternative to conventional activated sludge wastewater treatment. The architecture of the microbial granules allows the co-existence of different functional groups, e.g., nitrifying and denitrifying communities, which permits compact reactor design. However, little is known about the factors influencing community assembly in granular sludge, such as the effects of reactor operation strategies and influent wastewater composition. Here, we analyze the development of the microbiomes in parallel laboratory-scale anoxic/aerobic granular sludge reactors operated at low (0...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28500915/a-comparison-of-denitrifying-bacterial-community-structures-and-abundance-in-acidic-soils-between-natural-forest-and-re-vegetated-forest-of-nanling-nature-reserve-in-southern-china
#15
Han Meng, Ruonan Wu, Yong-Feng Wang, Ji-Dong Gu
Denitrification plays a key role in converting reactive nitrogen species to dinitrogen gas back into the atmosphere to maintain the equilibrium of nitrogen cycling in ecosystems. In this study, functional genes of nirK and nosZ were used to detect the community structure and abundance of denitrifying microorganisms in acidic forest soils in southern China. Three sets of factors were considered for a comparison among 5 forests, including forest types (natural vs. re-vegetated), depths (surface layer vs. lower layer) and seasons (winter vs...
May 10, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28487680/diversity-of-metabolically-active-bacteria-in-water-flooded-high-temperature-heavy-oil-reservoir
#16
Tamara N Nazina, Natalya M Shestakova, Ekaterina M Semenova, Alena V Korshunova, Nadezda K Kostrukova, Tatiana P Tourova, Liu Min, Qingxian Feng, Andrey B Poltaraus
The goal of this work was to study the overall genomic diversity of microorganisms of the Dagang high-temperature oilfield (PRC) and to characterize the metabolically active fraction of these populations. At this water-flooded oilfield, the microbial community of formation water from the near-bottom zone of an injection well where the most active microbial processes of oil degradation occur was investigated using molecular, cultural, radiotracer, and physicochemical techniques. The samples of microbial DNA and RNA from back-flushed water were used to obtain the clone libraries for the 16S rRNA gene and cDNA of 16S rRNA, respectively...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28484811/cultivation-of-denitrifying-anaerobic-methane-oxidizing-microorganisms-in-a-continuous-flow-sponge-bioreactor
#17
Masashi Hatamoto, Takafumi Sato, Sho Nemoto, Takashi Yamaguchi
Anaerobic treatment of sewage has many advantages; however, the effluent contains high levels of dissolved methane. In this study, we investigated the use of a closed-type downflow hanging sponge (DHS) reactor for application of the denitrifying anaerobic methane oxidation (DAMO) reaction for nitrogen and dissolved methane removal. When using nitrate, the DAMO reaction achieved a denitrification rate of 84.4 g N m(-3) day(-1), which is close to that required for practical application of denitrification to anaerobic sewage treatment...
May 8, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28473806/sinks-and-sources-of-intracellular-nitrate-in-gromiids
#18
Signe Høgslund, Tomas Cedhagen, Samuel S Bowser, Nils Risgaard-Petersen
A substantial nitrate pool is stored within living cells in various benthic marine environments. The fate of this bioavailable nitrogen differs according to the organisms managing the intracellular nitrate (ICN). While some light has been shed on the nitrate carried by diatoms and foraminiferans, no study has so far followed the nitrate kept by gromiids. Gromiids are large protists and their ICN concentration can exceed 1000x the ambient nitrate concentration. In the present study we investigated gromiids from diverse habitats and showed that they contained nitrate at concentrations ranging from 1 to 370 mM...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28465208/complete-genome-sequence-of-the-thermophilic-bacterium-geobacillus-subterraneus-kctc-3922-t-as-a-potential-denitrifier
#19
Yong-Jik Lee, Min-Kyu Park, Gun-Seok Park, Sang-Jae Lee, Sang Jun Lee, Bradley Seokhan Kim, Jae-Ho Shin, Dong-Woo Lee
Denitrification is a crucial process for the global nitrogen cycle through the reduction of nitrates by heterotrophic bacteria. Denitrifying microorganisms play an important role in eliminating fixed nitrogen pollutants from the ecosystem, concomitant with N2O emission. Although many microbial denitrifiers have been identified, little is known about the denitrifying ability of the genus Geobacillus. Here, we report the first complete genome sequences of Geobacillus subterraneus KCTC 3922(T), isolated from Liaohe oil field in China, and G...
April 29, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28463771/enhancing-denitrification-using-a-novel-in-situ-membrane-biofilm-reactor-ismbfr
#20
Yonghong Wu, Yizhou Li, Aura Ontiveros-Valencia, Luis Ordaz-Díaz, Junzhuo Liu, Chen Zhou, Bruce E Rittmann
The insufficient supply of electron donor in surface water contaminated with nitrate leads to its incomplete reduction in natural or constructed wetlands. Although the addition of organic matter (represented as chemical oxygen demand, COD) can stimulate N removal by denitrification, direct supplementation of COD creates unacceptable risks to effluent quality. An alternative for stimulating denitrification is supplying hydrogen gas (H2) as an inorganic electron donor. We evaluate an innovative means to do H2-based denitrification of surface waters in a wetland setting: the in-situ membrane biofilm reactor (isMBfR), in which H2 is delivered to a biofilm of denitrifying bacteria on demand based on the presence of nitrate...
April 25, 2017: Water Research
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