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https://www.readbyqxmd.com/read/28732405/increased-n2o-emission-by-inhibited-plant-growth-in-the-co2-leaked-soil-environment-simulation-of-co2-leakage-from-carbon-capture-and-storage-ccs-site
#1
You Jin Kim, Wenmei He, Daegeun Ko, Haegeun Chung, Gayoung Yoo
Atmospheric carbon dioxide (CO2) concentrations is continuing to increase due to anthropogenic activity, and geological CO2 storage via carbon capture and storage (CCS) technology can be an effective way to mitigate global warming due to CO2 emission. However, the possibility of CO2 leakage from reservoirs and pipelines exists, and such leakage could negatively affect organisms in the soil environment. Therefore, to determine the impacts of geological CO2 leakage on plant and soil processes, we conducted a greenhouse study in which plants and soils were exposed to high levels of soil CO2...
July 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28731479/marine-archaeal-dynamics-and-interactions-with-the-microbial-community-over-5-years-from-surface-to-seafloor
#2
Alma E Parada, Jed A Fuhrman
Marine archaea are critical contributors to global carbon and nitrogen redox cycles, but their temporal variability and microbial associations across the water column are poorly known. We evaluated seasonal variability of free living (0.2-1 μm size fraction) Thaumarchaea Marine Group I (MGI) and Euryarchaea Marine Group II (MGII) communities and their associations with the microbial community from surface to seafloor (890 m) over 5 years by 16S rRNA V4-V5 gene sequencing. MGI and MGII communities demonstrated distinct compositions at different depths, and seasonality at all depths...
July 21, 2017: ISME Journal
https://www.readbyqxmd.com/read/28730358/hydrogeochemical-characterization-and-groundwater-quality-assessment-in-intruded-coastal-brine-aquifers-laizhou-bay-china
#3
Xiaoying Zhang, Jinjie Miao, Bill X Hu, Hongwei Liu, Hanxiong Zhang, Zhen Ma
The aquifer in the coastal area of the Laizhou Bay is affected by salinization processes related to intense groundwater exploitation for brine resource and for agriculture irrigation during the last three decades. As a result, the dynamic balances among freshwater, brine, and seawater have been disturbed and the quality of groundwater has deteriorated. To fully understand the groundwater chemical distribution and evolution in the regional aquifers, hydrogeochemical and isotopic studies have been conducted based on the water samples from 102 observation wells...
July 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28728975/continuous-nitrogen-removal-by-a-single-stage-reactor-packed-with-ring-laced-string-medium
#4
Masahiro Tatara, Shu Ishikawa, Yoshiyuki Ueno
The efficiency of nitrogen removal by a partial-nitritation/anammox (PNA) reaction was investigated using a packed-bed reactor in which ring-laced strings were used as the supporting medium. A stable population of PNA microorganisms was established from typical activated sludge, after less than two months of acclimation in the packed-bed reactor, by applying a high nitrogen-loading rate (NLR: 0.53 kg/m(3)/d) and short hydraulic retention time (HRT: 1.8 h). The stability of reactor performance was confirmed in industrial wastewater (IW), demonstrating a nitrogen removal efficiency (NRE) of greater than 77% during 260 days of continuous operation, between 0...
July 17, 2017: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/28726704/simultaneous-heterotrophic-nitrification-and-aerobic-denitrification-at-high-concentrations-of-nacl-and-ammonia-nitrogen-by-halomonas-bacteria
#5
Te Wang, Jian Li, Ling Hua Zhang, Ying Yu, Yi Min Zhu
To improve the efficiency of simultaneous heterotrophic nitrification and aerobic denitrification (SND) at high concentrations of NaCl and ammonia nitrogen (NH4(+)-N), we investigated the SND characteristics of Halomonas bacteria with the ability to synthesize the compatible solute ectoine. Halomonas sp. strain B01, which was isolated, screened and identified in this study, could simultaneously remove nitrogen (N) by SND and synthesize ectoine under high NaCl conditions. Gene cloning and sequencing analysis indicated that this bacterial genome contains ammonia monooxygenase (amoA) and nitrate reductase (narH) genes...
July 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28726693/nitrogen-removal-in-a-shallow-maturation-pond-with-sludge-accumulated-during-10-years-of-operation-in-brazil
#6
V A J Rodrigues, E F A Mac Conell, D F C Dias, M von Sperling, J C de Araújo, J L Vasel
Accumulated sludge in polishing (maturation) ponds reduces the hydraulic retention time (smaller useful volume), and this could potentially lead to a decrease in performance. However, settled biomass, present in the sediments, can contribute to nitrogen removal by different mechanisms such as nitrification and denitrification. This study investigated the influence of the bottom sludge present in a shallow maturation pond treating the effluent from an anaerobic reactor on the nitrification and denitrification processes...
July 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28724105/nitrifying-kinetics-and-the-persistence-of-nitrite-in-the-seine-river-france
#7
M Raimonet, T Cazier, V Rocher, A M Laverman
Although a higher oxidation rate for nitrite than for ammonia generally prevents nitrite accumulation in oxic waters, nitrite concentrations in the Seine River (1-31 μM) exceed European norms. We investigated the kinetics of in situ ammonia- and nitrite-oxidizing communities in river water and wastewater treatment plant (WWTP) effluents to determine the role of pelagic nitrification in the origin and persistence of nitrite downstream of Paris. The main source of nitrite is the major Parisian WWTP, and its persistence, up to tens of kilometers downstream of the plant, is explained by low ammonia and nitrite oxidation rates and high river flow...
May 2017: Journal of Environmental Quality
https://www.readbyqxmd.com/read/28724099/use-of-%C3%AE-15-n-and-%C3%AE-18-o-values-for-nitrate-source-identification-under-irrigated-crops-a-cautionary-vadose-zone-tale
#8
Shawn E Loo, M Cathryn Ryan, Bernie J Zebarth, Shawn H Kuchta, Denise Neilsen, Bernhard Mayer
Source nitrogen (N) identification of leachate or groundwater nitrate is complicated by N source mixing and N and oxygen (O) isotope fractionation caused by microbial N transformations. This experiment examined the δN and δO values in leachate collected over 1 yr at 55 cm below raspberry ( L.) plots receiving either synthetic fertilizer (FT) or poultry manure (MT). The large ranges of δN (FT: -2.4 to +8.7‰, MT: +1.6 to +9.6‰) and δO (FT: -9.9 to -0.3‰, MT: -10.9 to +1.7‰) values in leachate collected under crop rows prohibited the reliable identification of the applied N sources on individual sampling dates...
May 2017: Journal of Environmental Quality
https://www.readbyqxmd.com/read/28718056/aeration-control-strategies-to-stimulate-simultaneous-nitrification-denitrification-via-nitrite-during-the-formation-of-aerobic-granular-sludge
#9
Thomas Dobbeleers, Jolien D'aes, Solange Miele, Michel Caluwé, Veerle Akkermans, Dominique Daens, Luc Geuens, Jan Dries
In this study, a sequencing batch reactor (SBR), treating synthetic wastewater (COD/N = 5), was operated in two stages. During stage I, an aeration control strategy based on oxygen uptake rate (OUR) was applied, to accomplish nitrogen removal via nitrite >80%. In stage II, the development of aerobic granular sludge (AGS) was examined while two aeration control strategies (OUR and pH slope) maintained the nitrite pathway and optimized the simultaneous nitrification-denitrification (SND) performance. Stimulation of slow-growing organisms, (denitrifying) polyphosphate-accumulating organisms (D)PAO and (denitrifying) glycogen-accumulating organisms (D)GAO leads to full granulation (at day 200, SVI10 = 47...
July 17, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28718022/identifying-nitrate-sources-and-transformations-in-taizi-river-basin-northeast-china
#10
Yanli Li, Yanfen Li, Tongqian Zhao, Wei Sun, Zirui Yang
The nitrate (NO3(-)) pollution of aquatic systems in Northeast China is a severe problem. To identify NO3(-) sources and transformations in different zones with different land uses in the Taizi River Basin, ion-exchange methods were utilized to determine the concentrations and isotopic compositions (δ(15)N and δ(18)O) of NO3(-) and chloride (Cl(-)). Results showed that Cl(-) concentrations ranged from 2.7 to 73.4 mg/L. Cl(-) concentrations were the highest in zone 8 and the lowest in zone 1. NO3(-) concentrations ranged from 0...
July 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28716941/cryptic-oxygen-cycling-in-anoxic-marine-zones
#11
Emilio Garcia-Robledo, Cory C Padilla, Montserrat Aldunate, Frank J Stewart, Osvaldo Ulloa, Aurélien Paulmier, Gerald Gregori, Niels Peter Revsbech
Oxygen availability drives changes in microbial diversity and biogeochemical cycling between the aerobic surface layer and the anaerobic core in nitrite-rich anoxic marine zones (AMZs), which constitute huge oxygen-depleted regions in the tropical oceans. The current paradigm is that primary production and nitrification within the oxic surface layer fuel anaerobic processes in the anoxic core of AMZs, where 30-50% of global marine nitrogen loss takes place. Here we demonstrate that oxygenic photosynthesis in the secondary chlorophyll maximum (SCM) releases significant amounts of O2 to the otherwise anoxic environment...
July 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28716929/nitric-oxide-is-an-obligate-bacterial-nitrification-intermediate-produced-by-hydroxylamine-oxidoreductase
#12
Jonathan D Caranto, Kyle M Lancaster
Ammonia (NH3)-oxidizing bacteria (AOB) emit substantial amounts of nitric oxide (NO) and nitrous oxide (N2O), both of which contribute to the harmful environmental side effects of large-scale agriculture. The currently accepted model for AOB metabolism involves NH3 oxidation to nitrite (NO2(-)) via a single obligate intermediate, hydroxylamine (NH2OH). Within this model, the multiheme enzyme hydroxylamine oxidoreductase (HAO) catalyzes the four-electron oxidation of NH2OH to NO2(-) We provide evidence that HAO oxidizes NH2OH by only three electrons to NO under both anaerobic and aerobic conditions...
July 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28716629/characterization-of-novel-bacillus-strain-n31-from-mariculture-water-capable-of-halophilic-heterotrophic-nitrification-aerobic-denitrification
#13
Fei Huang, Luqing Pan, Na Lv, Xianming Tang
The development of an intensive aquaculture industry has been accompanied by increasing environmental impacts, especially nitrogen pollution. In this study, a novel halophilic bacterium capable of heterotrophic nitrification and aerobic denitrification was isolated from mariculture water and identified as Bacillus litoralis N31. The efficiency of ammonium, nitrite and nitrate removal by N31 were 86.3%, 89.3% and 89.4%, respectively, after a 48-h cultivation in sole N-source medium with initial nitrogen approximately 20 mg/L...
July 14, 2017: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/28716411/genetic-mitigation-strategies-to-tackle-agricultural-ghg-emissions-the-case-for-biological-nitrification-inhibition-technology
#14
REVIEW
G V Subbarao, J Arango, K Masahiro, A M Hooper, T Yoshihashi, Y Ando, K Nakahara, S Deshpande, I Ortiz-Monasterio, M Ishitani, M Peters, N Chirinda, L Wollenberg, J C Lata, B Gerard, S Tobita, I M Rao, H J Braun, V Kommerell, J Tohme, M Iwanaga
Accelerated soil-nitrifier activity and rapid nitrification are the cause of declining nitrogen-use efficiency (NUE) and enhanced nitrous oxide (N2O) emissions from farming. Biological nitrification inhibition (BNI) is the ability of certain plant roots to suppress soil-nitrifier activity, through production and release of nitrification inhibitors. The power of phytochemicals with BNI-function needs to be harnessed to control soil-nitrifier activity and improve nitrogen-cycling in agricultural systems. Transformative biological technologies designed for genetic mitigation are needed, so that BNI-enabled crop-livestock and cropping systems can rein in soil-nitrifier activity, to help reduce greenhouse gas (GHG) emissions and globally make farming nitrogen efficient and less harmful to environment...
September 2017: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/28715697/development-of-simultaneous-nitrification-denitrification-snd-in-biofilm-reactors-with-partially-coupled-a-novel-biodegradable-carrier-for-nitrogen-rich-water-purification
#15
Jing Zhao, Lijuan Feng, Guangfeng Yang, Jincheng Dai, Jun Mu
Development of simultaneous nitrification-denitrification (SND) is a promising approach for nitrogen-rich water purification. Coupling biofilm reactors with novel biodegradable carrier of Pumelo Peel (PP) and various conventional plastic fillers (polyurethane filler, SPR-1 suspension filler, TA-II elastic filler and sphere filler) were examined to achieve SND in this study. Results represented that partially coupled with PP could achieve highly efficient SND. Optimal performance appealed in a bioreactor of coupling PP and SPR-1filler with ammonia and total nitrogen removal efficiencies of 96...
June 26, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28715138/microbial-functional-diversity-covaries-with-permafrost-thaw-induced-environmental-heterogeneity-in-tundra-soil
#16
Mengting M Yuan, Jin Zhang, Kai Xue, Liyou Wu, Ye Deng, Jie Deng, Lauren Hale, Xishu Zhou, Zhili He, Yunfeng Yang, Joy D Van Nostrand, Edward A G Schuur, Konstantinos T Konstantinidis, C Ryan Penton, James R Cole, James M Tiedje, Yiqi Luo, Jizhong Zhou
Permafrost soil in high latitude tundra is one of the largest terrestrial carbon (C) stocks and is highly sensitive to climate warming. Understanding microbial responses to warming induced environmental changes are critical to evaluating their influences on soil biogeochemical cycles. In this study, a functional gene array (i.e. GeoChip 4.2) was used to analyze the functional capacities of soil microbial communities collected from a naturally degrading permafrost region in Central Alaska. Varied thaw history was reported to be the main driver of soil and plant differences across a gradient of minimally, moderately and extensively thawed sites...
July 17, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28715112/effects-of-free-air-carbon-dioxide-enrichment-face-on-nitrogen-assimilation-and-growth-of-winter-wheat-under-nitrate-and-ammonium-fertilization
#17
Markus Dier, Rieke Meinen, Martin Erbs, Lena Kollhorst, Christin-Kirsty Baillie, David Kaufholdt, Martin Kücke, Hans-Joachim Weigel, Christian Zörb, Robert Hänsch, Remy Manderscheid
A two year Free Air CO2 Enrichment (FACE) experiment was conducted with winter wheat. It was investigated whether elevated atmospheric CO2 concentrations (e[CO2 ]) inhibit nitrate assimilation and whether better growth and nitrogen acquisition under e[CO2 ] can be achieved with an ammonium based fertilization as it was observed in hydroponic culture with wheat. Under e[CO2 ] a decrease of nitrate assimilation has been discussed as the cause for observed declines in protein concentration in C3 cereals. Wheat was grown under ambient [CO2 ] and e[CO2 ] (600 ppm) with three levels (deficiency, optimal and excessive) of nitrate based fertilization (calcium ammonium nitrate; CAN) or with optimal ammonium based fertilization...
July 17, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28711297/the-nitrogen-removal-performance-and-microbial-communities-in-a-two-stage-deep-sequencing-constructed-wetland-for-advanced-treatment-of-secondary-effluent
#18
Shuang He, Yingmu Wang, Chuansong Li, Yancheng Li, Jian Zhou
The advanced treatment of secondary effluent was conducted in a two-stage deep sequencing constructed wetland (DSCW) which comprised a denitrification chamber (W1) and a nitrification chamber (W2). The results showed that a superior NO3(-)-N removal rate was observed in W1 with a C/N ratio of 6.5, and a high NH4(+)-N removal rate was obtained when the W2 was operated with 6-h duration of idle. In the long-term operation for 45days, the two-stage DSCW pilot system achieved high and stable removal of TN, NH4(+)-N and NO3(-)-N, which were 92...
June 29, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28710998/the-potential-multiple-mechanisms-and-microbial-communities-in-simultaneous-nitrification-and-denitrification-process-treating-high-carbon-and-nitrogen-concentration-saline-wastewater
#19
Jiale Wang, Benzhou Gong, Yingmu Wang, Yuhui Wen, Jian Zhou, Qiang He
A simultaneous nitrification and denitrification (SND) process in sequencing batch biofilm reactor (SBBR) was established to treat high carbon and nitrogen saline wastewater in this study. Acetate, glucose and an organic mixture were applied as organic sources in three SBBRs, achieving average total nitrogen removal efficiency of 97.15%, 63.94% and 94.99% during 120days' operation, respectively. The underlying nitrogen removal mechanisms were investigated by 16S rRNA sequencing and batch tests. Results showed different carbon sources had great impact on microbial communities, and led to different nitrogen removal mechanism...
June 26, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28710983/seasonal-variation-of-bacterial-community-in-biological-aerated-filter-for-ammonia-removal-in-drinking-water-treatment
#20
Hongyuan Liu, Liying Zhu, Xiaohe Tian, Yeshi Yin
Biological aerated filter (BAF) is widely used in wastewater treatment plants (WWTPs) and shows potential application of micropolluted drinking water sources with a higher NH4(+)-N removal efficiency during short warm seasons. Here we adopted a pilot lava-based BAF setup as a pretreatment unit of drinking water treatment plant (DWTP) and achieved a great performance of ammonia removal over a two-year operation using natural river water. We respectively observed 92.62% of NH4(+)-N removal efficiency, 97.88% of NO2(-)-N removal efficiency in summer, and 77...
July 10, 2017: Water Research
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