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https://www.readbyqxmd.com/read/28433911/enhanced-nitrogen-removal-by-membrane-aerated-nitritation-anammox-in-a-bioelectrochemical-system
#1
Yuli Yang, Xiaojin Li, Xiaoli Yang, Zhen He
A bioelectrochemical system (BES) containing membrane-aerated nitritation-anammox in its cathode has been developed for enhancing nitrogen removal. Long-term performance and microbial community structure were investigated. The BES using loop operation and external voltage achieved the highest total nitrogen removal efficiency of 94.8±7.7%, and COD removal of 98.2±3.3% at hydraulic retention time of 60h and the lumen pressure of 10psi. The energy consumption of the system was 0.90kWhkgN(-1) or 0.38kWhkg COD(-1)...
April 9, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28426987/a-review-on-nitrous-oxide-n2o-emissions-during-biological-nutrient-removal-from-municipal-wastewater-and-sludge-reject-water
#2
REVIEW
Theoni Maria Massara, Simos Malamis, Albert Guisasola, Juan Antonio Baeza, Constantinos Noutsopoulos, Evina Katsou
Nitrous oxide (N2O) is an important pollutant which is emitted during the biological nutrient removal (BNR) processes of wastewater treatment. Since it has a greenhouse effect which is 265 times higher than carbon dioxide, even relatively small amounts can result in a significant carbon footprint. Biological nitrogen (N) removal conventionally occurs with nitrification/denitrification, yet also through advanced processes such as nitritation/denitritation and completely autotrophic N-removal. The microbial pathways leading to the N2O emission include hydroxylamine oxidation and nitrifier denitrification, both activated by ammonia oxidizing bacteria, and heterotrophic denitrification...
April 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28419436/ammonia-oxidizer-populations-vary-with-nitrogen-cycling-across-a-tropical-montane-mean-annual-temperature-gradient
#3
S Pierre, I Hewson, J P Sparks, C M Litton, C Giardina, P M Groffman, T J Fahey
Functional gene approaches have been used to better understand the roles of microbes in driving forest soil nitrogen (N) cycling rates and bioavailability. Ammonia oxidation is a rate limiting step in nitrification, and is a key area for understanding environmental constraints on N availability in forests. We studied how increasing temperature affects the role of ammonia oxidizing archaea (AOA) and bacteria (AOB) in soil N cycling and availability by using a highly constrained natural mean annual temperature (MAT) elevation gradient in a tropical montane wet forest...
April 18, 2017: Ecology
https://www.readbyqxmd.com/read/28410439/responses-of-bacterial-communities-to-cuo-nanoparticles-in-activated-sludge-system
#4
Xiaohui Wang, Jing Li, Rui Liu, Reti Hai, Dexun Zou, Xiaobiao Zhu, Nan Luo
The main objectives of this study were to investigate the influence of copper oxide nanoparticles (CuO NPs) on wastewater nutrient removal, bacterial community and molecular ecological network in activated sludge. The results showed that long-term exposure to 1 mg/L CuO NPs induced an increase of effluent concentrations of ammonia and total phosphorus, which was consistent with the inhibition of enzyme activities of ammonia monooxygenase, nitrite oxidoreductase, exopolyphosphatase and polyphosphate in the presence of CuO NPs...
April 14, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28402397/convergence-and-contrast-in-the-community-structure-of-bacteria-fungi-and-archaea-along-a-tropical-elevation-climate-gradient
#5
Kabir G Peay, Christian von Sperber, Emily Cardarelli, Hirokazu Toju, Christopher A Francis, Oliver A Chadwick, Peter M Vitousek
Changes in species richness along climatological gradients have been instrumental in developing theories about the general drivers of biodiversity. Previous studies on microbial communities along climate gradients on mountainsides have revealed positive, negative and neutral richness trends. We examined changes in richness and composition of Fungi, Bacteria and Archaea in soil along a 50-1000 m elevation, 280-3280 mm/yr precipitation gradient in Hawai'i. Soil properties and their drivers are exceptionally well understood along this gradient...
April 11, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28399822/dominant-bacterial-phyla-in-caves-and-their-predicted-functional-roles-in-c-and-n-cycle
#6
Surajit De Mandal, Raghunath Chatterjee, Nachimuthu Senthil Kumar
BACKGROUND: Bacteria present in cave often survive by modifying their metabolic pathway or other mechanism. Understanding these adopted bacteria and their survival strategy inside the cave is an important aspect of microbial ecology. Present study focuses on the bacterial community and geochemistry in five caves of Mizoram, Northeast India. The objective of this study was to explore the taxonomic composition and presumed functional diversity of cave sediment metagenomes using paired end Illumina sequencing using V3 region of 16S rRNA gene and bioinformatics pipeline...
April 11, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28399415/nitrogen-removal-performance-and-loading-capacity-of-a-novel-single-stage-nitritation-anammox-system-with-syntrophic-micro-granules
#7
Shaopo Wang, Yuan Liu, Qigui Niu, Jiayuan Ji, Toshimasa Hojo, Yu-You Li
The operation performance of a novel micro-granule based syntrophic system of nitritation and anammox was studied by controlling the oxygen concentration and maintaining a constant temperature of 25°C. With the oxygen concentration of around 0.11 (<0.15)mg/L, the single-stage nitritation-anammox system was startup successfully at a nitrogen loading rate (NLR) of 1.5kgN/m(3)/d. The reactor was successfully operated at volumetric N loadings ranging from 0.5 to 2.5kgN/m(3)/d with a high nitrogen removal of 82%...
March 29, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28394197/ammonia-oxidizers-diversity-in-wastewater-treatment-processes
#8
Ji Hye Jo, Woong Kim, Juntaek Lim
 Diversity of ammonia-oxidizing bacteria (AOB) within the beta-subclass of Proteobacteria was investigated by genus and family specific real-time quantitative PCR (qPCR) assays on samples drawn from wastewater treatment systems. Sequence types of Nitrosomonas europaea-, Nitrosomonas nitrosa-, and Nitrosomonas cryotolerans-clusters were successfully quantified in a number of laboratory- and full-scale wastewater treatment systems. The 16S rRNA gene copy numbers ranged from 7.0×10(3) to 6.8×10(6), 1.1×10(7) to 1...
April 10, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28390307/comammox-in-drinking-water-systems
#9
Yulin Wang, Liping Ma, Yanping Mao, Xiaotao Jiang, Yu Xia, Ke Yu, Bing Li, Tong Zhang
The discovery of complete ammonia oxidizer (comammox) has fundamentally upended our perception of the global nitrogen cycle. Here, we reported four metagenome assembled genomes (MAGs) of comammox Nitrospira that were retrieved from metagenome datasets of tap water in Singapore (SG-bin1 and SG-bin2), Hainan province, China (HN-bin3) and Stanford, CA, USA (ST-bin4). Genes of phylogenetically distinct ammonia monooxygenase subunit A (amoA) and hydroxylamine dehydrogenase (hao) were identified in these four MAGs...
June 1, 2017: Water Research
https://www.readbyqxmd.com/read/28387799/nitrosomonas-europaea-biofilm-formation-is-enhanced-by-pseudomonas-aeruginosa
#10
Morgan Petrovich, Chia-Yun Wu, Alex Rosenthal, Kuan-Fu Chen, Aaron I Packman, George F Wells
Biofilms are useful in biotechnology applications such as wastewater treatment, where aggregation of cells on surfaces can increase retention of slow-growing organisms such as ammonia-oxidizing bacteria (AOB). The formation and morphological development of polymicrobial biofilms including AOB are not thoroughly understood. Here, we investigated the formation of Nitrosomonas europaea AOB biofilms in flow cell systems. N. europaea developed substantially greater biovolume in co-culture with heterotrophic Pseudomonas aeruginosa than when cultured alone...
April 6, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28385350/nitrification-in-a-completely-stirred-tank-reactor-treating-the-liquid-phase-of-digestate-the-way-towards-rational-use-of-nitrogen
#11
Pavel Svehla, Helena Radechovska, Lukas Pacek, Pavel Michal, Ales Hanc, Pavel Tlustos
The nitrification of the liquid phase of digestate (LPD) was conducted using a 5L completely stirred tank reactor (CSTR) in two independent periods (P1 - without pH control; P2 - with pH control). The possibility of minimizing nitrogen losses during the application of LPD to the soil as well as during long-term storage or thermal thickening of LPD using nitrification was discussed. Moreover, the feasibility of applying the nitrification of LPD to the production of electron acceptors for biological desulfurization of biogas was assessed...
April 3, 2017: Waste Management
https://www.readbyqxmd.com/read/28378285/nitrate-decreases-methane-production-also-by-increasing-methane-oxidation-through-stimulating-nc10-population-in-ruminal-culture
#12
Lihui Liu, Xiurong Xu, Yangchun Cao, Chuanjiang Cai, Hongxiao Cui, Junhu Yao
Studies proved that addition of nitrate in rumen could lead to reduction of methane emission. The mechanism of this function was involved in the competition effect of nitrate on hydrogen consumption and the inhibitory effect of generated nitrite on methanogen proliferation. The present study investigated an alternative mechanism that denitrifying anaerobic methane oxidizing (DAMO) bacteria, DAMO archaea and anammox bacteria may co-exist in rumen, therefore, more methane can be oxidized when addition of nitrate...
December 2017: AMB Express
https://www.readbyqxmd.com/read/28376730/application-of-hierarchical-oligonucleotide-primer-extension-hope-to-assess-relative-abundances-of-ammonia-and-nitrite-oxidizing-bacteria
#13
Giantommaso Scarascia, Hong Cheng, Moustapha Harb, Pei-Ying Hong
BACKGROUND: Establishing an optimal proportion of nitrifying microbial populations, including ammonia-oxidizing bacteria (AOB), nitrite-oxidizing bacteria (NOB), complete nitrite oxidizers (comammox) and ammonia-oxidizing archaea (AOA), is important for ensuring the efficiency of nitrification in water treatment systems. Hierarchical oligonucleotide primer extension (HOPE), previously developed to rapidly quantify relative abundances of specific microbial groups of interest, was applied in this study to track the abundances of the important nitrifying bacterial populations...
April 4, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28368686/co-metabolic-degradation-of-steroid-estrogens-by-heterotrophic-bacteria-and-nitrifying-bacteria-in-mbrs
#14
Hai L Song, Xiao L Yang, Ming Q Xia, Ming Chen
Three membrane bioreactors (MBRs) with different carbon/nitrogen ratios were operated in parallel to investigate the effects of heterotrophic bacteria and nitrifying bacteria on the co-metabolic degradation of the steroid estrogens (SEs) estrone (E1) and 17α-ethinylestradiol (EE2). The functional community structures of the MBRs were analyzed using fluorescence in situ hybridization, and correlations between the functional community structures and SE removal efficiencies were established. The results showed that α-Proteobacteria, β-Proteobacteria, and γ-proteobacteria were responsible for the removal of E1, whereas ammonia-oxidizing bacteria, Nitrosomonas sp...
April 3, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28367960/nitrous-oxide-production-in-a-granule-based-partial-nitritation-reactor-a-model-based-evaluation
#15
Lai Peng, Jing Sun, Yiwen Liu, Xiaohu Dai, Bing-Jie Ni
Sustainable wastewater treatment has been attracting increasing attentions over the past decades. However, the production of nitrous oxide (N2O), a potent GHG, from the energy-efficient granule-based autotrophic nitrogen removal is largely unknown. This study applied a previously established N2O model, which incorporated two N2O production pathways by ammonia-oxidizing bacteria (AOB) (AOB denitrification and the hydroxylamine (NH2OH) oxidation). The two-pathway model was used to describe N2O production from a granule-based partial nitritation (PN) reactor and provide insights into the N2O distribution inside granules...
April 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28360898/archaea-dominate-the-ammonia-oxidizing-community-in-deep-sea-sediments-of-the-eastern-indian-ocean-from-the-equator-to-the-bay-of-bengal
#16
Jing Wang, Jinjun Kan, Xiaodong Zhang, Zhiqiang Xia, Xuecheng Zhang, Gang Qian, Yanyi Miao, Xiaoyun Leng, Jun Sun
Ammonia-oxidizing Archaea (AOA) and ammonia-oxidizing Bacteria (AOB) oxidize ammonia to nitrite, and therefore play essential roles in nitrification and global nitrogen cycling. To better understand the population structure and the distribution of AOA and AOB in the deep Eastern Indian Ocean (EIO), nine surface sediment samples (>3,300 m depth) were collected during the inter-monsoon Spring 2013. One sediment sample from the South China Sea (SCS; 2,510 m) was also included for comparison. The community composition, species richness, and diversity were characterized by clone libraries (total 1,238 clones), and higher diversity of archaeal amoA genes than bacterial amoA genes was observed in all analyzed samples...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28351130/synergic-adsorption-biodegradation-by-an-advanced-carrier-for-enhanced-removal-of-high-strength-nitrogen-and-refractory-organics
#17
Muhammad Ahmad, Sitong Liu, Nasir Mahmood, Asif Mahmood, Muhammad Ali, Maosheng Zheng, Jinren Ni
Coking wastewater contains not only high-strength nitrogen but also toxic biorefractory organics. This study presents simultaneous removal of high-strength quinoline, carbon, and ammonium in coking wastewater by immobilized bacterial communities composed of a heterotrophic strain Pseudomonas sp. QG6 (hereafter referred as QG6), ammonia-oxidizing bacteria (AOB), and anaerobic ammonium oxidation bacteria (anammox). The bacterial immobilization was implemented with the help of a self-designed porous cubic carrier that created structured microenvironments including an inner layer adapted for anaerobic bacteria, a middle layer suitable for coaggregation of certain aerobic and anaerobic bacteria, and an outer layer for heterotrophic bacteria...
April 6, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28345060/genome-reduction-and-microbe-host-interactions-drive-adaptation-of-a-sulfur-oxidizing-bacterium-associated-with-a-cold-seep-sponge
#18
Ren-Mao Tian, Weipeng Zhang, Lin Cai, Yue-Him Wong, Wei Ding, Pei-Yuan Qian
As the most ancient metazoan, sponges have established close relationships with particular microbial symbionts. However, the characteristics and physiology of thioautotrophic symbionts in deep-sea sponges are largely unknown. Using a tailored "differential coverage binning" method on 22-Gb metagenomic sequences, we recovered the nearly complete genome of a sulfur-oxidizing bacterium (SOB) that dominates the microbiota of the cold seep sponge Suberites sp. Phylogenetic analyses suggested that this bacterium (an unclassified gammaproteobacterium termed "Gsub") may represent a new deep-sea SOB group...
March 2017: MSystems
https://www.readbyqxmd.com/read/28334274/interactive-effects-of-multiple-climate-change-factors-on-ammonia-oxidizers-and-denitrifiers-in-a-temperate-steppe
#19
Cui-Jing Zhang, Ju-Pei Shen, Yi-Fei Sun, Jun-Tao Wang, Li-Mei Zhang, Zhong-Ling Yang, Hong-Yan Han, Shi-Qiang Wan, Ji-Zheng 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...
April 1, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28334116/spatial-and-temporal-variability-in-the-nitrogen-cyclers-of-hypereutrophic-lake-taihu
#20
Lauren E Krausfeldt, Xiangming Tang, Jodie van de Kamp, Guang Gao, Levente Bodrossy, Gregory L Boyer, Steven W Wilhelm
Harmful cyanobacterial blooms (cyanoHABs) are a major threat to freshwater ecosystems worldwide. Evidence suggests that both nitrogen and phosphorus are important nutrients in the development and proliferation of blooms, yet much less is known about nitrogen cycling dynamics in these systems. To assess the potential nitrogen cycling function of the cyanoHAB community, surface water samples were collected in Lake Tai (Taihu), China over a 5-month bloom event in 2014. The expression of six nitrogen cycling genes (nifH, hzsA, nxrB, nrfA, amoA, nosZ) was surveyed using a targeted microarray with probes designed to provide phylogenetic information...
April 1, 2017: FEMS Microbiology Ecology
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