Base de dados : MEDLINE
Pesquisa : D01.029.260.575 [Categoria DeCS]
Referências encontradas : 675 [refinar]
Mostrando: 1 .. 10   no formato [Detalhado]

página 1 de 68 ir para página                         

  1 / 675 MEDLINE  
              next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28742971
[Au] Autor:Scharko NK; Martin ET; Losovyj Y; Peters DG; Raff JD
[Ad] Endereço:School of Public and Environmental Affairs, Indiana University , 1315 East 10th Street, Bloomington, Indiana 47405, United States.
[Ti] Título:Evidence for Quinone Redox Chemistry Mediating Daytime and Nighttime NO -to-HONO Conversion on Soil Surfaces.
[So] Source:Environ Sci Technol;51(17):9633-9643, 2017 Sep 05.
[Is] ISSN:1520-5851
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Humic acid (HA) is thought to promote NO conversion to nitrous acid (HONO) on soil surfaces during the day. However, it has proven difficult to identify the reactive sites in natural HA substrates. The mechanism of NO reduction on soil surrogates composed of HA and clay minerals was studied by use of a coated-wall flow reactor and cavity-enhanced spectroscopy. Conversion of NO to HONO in the dark was found to be significant and correlated to the abundance of C-O moieties in HA determined from the X-ray photoelectron spectra of the C 1s region. Twice as much HONO was formed when NO reacted with HA that was photoreduced by irradiation with UV-visible light compared to the dark reaction; photochemical reactivity was correlated to the abundance of C═O moieties rather than C-O groups. Bulk electrolysis was used to generate HA in a defined reduction state. Electrochemically reduced HA enhanced NO -to-HONO conversion by a factor of 2 relative to non-reduced HA. Our findings suggest that hydroquinones and benzoquinones, which are interchangeable via redox equilibria, contribute to both thermal and photochemical HONO formation. This conclusion is supported by experiments that studied NO reactivity on mineral surfaces coated with the model quinone, juglone. Results provide further evidence that redox-active sites on soil surfaces drive ground-level NO -to-nitrite conversion in the atmospheric boundary layer throughout the day, while amphoteric mineral surfaces promote the release of nitrite formed as gaseous HONO.
[Mh] Termos MeSH primário: Ácido Nitroso
Quinonas/química
[Mh] Termos MeSH secundário: Nitritos
Oxirredução
Solo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Nitrites); 0 (Quinones); 0 (Soil); T2I5UM75DN (Nitrous Acid)
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171218
[Lr] Data última revisão:
171218
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170726
[St] Status:MEDLINE
[do] DOI:10.1021/acs.est.7b01363


  2 / 675 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28847081
[Au] Autor:Wang D; Fu Q; Xu Q; Liu Y; Hao Ngo H; Yang Q; Zeng G; Li X; Ni BJ
[Ad] Endereço:College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
[Ti] Título:Free nitrous acid-based nitrifying sludge treatment in a two-sludge system enhances nutrient removal from low-carbon wastewater.
[So] Source:Bioresour Technol;244(Pt 1):920-928, 2017 Nov.
[Is] ISSN:1873-2976
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:A new method to enhance nutrient removal from low carbon-wastewater was developed. The method consists of a two-sludge system (i.e., an anaerobic-anoxic-oxic reactor coupled to a nitrifying reactor (N-SBR)) and a nitrifying-sludge treatment unit using free nitrous acid (FNA). Initially, 65.1±2.9% in total nitrogen removal and 69.6±3.4% in phosphate removal were obtained without nitrite accumulation. When 1/16 of the nitrifying sludge was daily treated with FNA at 1.1mgN/L for 24h, ∼28.5% of nitrite was accumulated in the N-SBR, and total nitrogen and phosphate removal increased to 72.4±3.2% and 76.7±2.9%, respectively. About 67.8% of nitrite was accumulated at 1.9mgN/L FNA, resulting in 82.9±3.8% in total nitrogen removal and 87.9±3.5% in phosphate removal. Fluorescence in-situ hybridization analysis showed that FNA treatment reduced the abundance of nitrite oxidizing bacteria (NOB), especially that of Nitrospira sp.
[Mh] Termos MeSH primário: Carbono
Ácido Nitroso
Águas Residuais
[Mh] Termos MeSH secundário: Reatores Biológicos
Nitritos
Nitrogênio
Fósforo
Esgotos
Eliminação de Resíduos Líquidos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Nitrites); 0 (Sewage); 0 (Waste Water); 27YLU75U4W (Phosphorus); 7440-44-0 (Carbon); N762921K75 (Nitrogen); T2I5UM75DN (Nitrous Acid)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171023
[Lr] Data última revisão:
171023
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170830
[St] Status:MEDLINE


  3 / 675 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28683383
[Au] Autor:Zahedi S; Icaran P; Yuan Z; Pijuan M
[Ad] Endereço:Catalan Institute for Water Research (ICRA), Emili Grahit Street, 101, H(2)O Building, Scientific and Technological Park of the University of Girona, 17003 Girona, Spain. Electronic address: zahedi.diaz@gmail.com.
[Ti] Título:Exploring alternatives to reduce economical costs associated with FNA pre-treatment of waste activated sludge.
[So] Source:Bioresour Technol;243:315-318, 2017 Nov.
[Is] ISSN:1873-2976
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Recent studies have shown the effectiveness of Free Nitrous Acid (FNA) pre-treatment in enhancing sludge biodegradability and improving its methane production potential. FNA is regarded as an environmental friendly pre-treatment which can be easily applied when a source of nitrite is present in wastewater treatment plants. However, when nitrite is not available and needs to be purchased, this treatment can become less attractive due to the costs associated to nitrite. In order to overcome this possible limitation, two different strategies to optimize the use of nitrite during FNA treatment were investigated: i) Recovering NO after the pre-treatment is completed; and ii) Concentrating the sludge before FNA pre-treatment. Results show that recovering NO from the pre-treated sludge is not suitable due to the loss of soluble organic matter present in the supernatant after the pre-treatment. However, concentrating the sludge before the pre-treatment seems a good strategy to optimize the use of nitrite.
[Mh] Termos MeSH primário: Reatores Biológicos
Nitritos
[Mh] Termos MeSH secundário: Ácido Nitroso
Esgotos
Águas Residuais
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Nitrites); 0 (Sewage); 0 (Waste Water); T2I5UM75DN (Nitrous Acid)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171023
[Lr] Data última revisão:
171023
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170707
[St] Status:MEDLINE


  4 / 675 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28624728
[Au] Autor:Zheng M; Zuo Z; Zhang Y; Cui Y; Dong Q; Liu Y; Huang X; Yuan Z
[Ad] Endereço:State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China; Advanced Water Management Centre, The University of Queensland, St Lucia, QLD 4072, Australia.
[Ti] Título:Nitrite production from urine for sulfide control in sewers.
[So] Source:Water Res;122:447-454, 2017 Oct 01.
[Is] ISSN:1879-2448
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Most commonly used methods for sewer sulfide control involves dosing chemical agents to wastewater, which incurs high operational costs. Here, we propose and demonstrate a cost-effective and environmentally attractive approach to sewer sulfide control through urine separation and its subsequent conversion to nitrite prior to intermittent dosage to sewers. Urine collected from a male toilet urinal was fed to laboratory-scale sequencing batch reactors. The reactors stably converted roughly 50% of the nitrogen in urine to nitrite, with high abundance (at 17.46%) of known ammonia-oxidizing bacteria (AOB) of the genus Nitrosomonas, and absence (below detection level) of typical nitrite-oxidizing bacteria of the genus Nitrospira, according to 454 pyrosequencing analysis. The stable nitrite production was achieved at both relatively high (1.0-2.0 mg/L) and low (0.2-0.3 mg/L) dissolved oxygen concentrations. Dosing tests in laboratory-scale sewer systems confirmed the sulfide control effectiveness of free nitrous acid generated from urine. Life cycle assessment indicated that, compared with commodity chemicals, nitrite/free nitrous acid (FNA) production from urine for sulfide control in sewers would lower the operational costs by approximately 2/3 and greenhouse gas (GHG) emissions by 1/3 in 20 years.
[Mh] Termos MeSH primário: Nitritos
Esgotos
Sulfetos
[Mh] Termos MeSH secundário: Nitrosomonas
Ácido Nitroso
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Nitrites); 0 (Sewage); 0 (Sulfides); T2I5UM75DN (Nitrous Acid)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171013
[Lr] Data última revisão:
171013
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170619
[St] Status:MEDLINE


  5 / 675 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28248489
[Au] Autor:Ma Q; Wang T; Liu C; He H; Wang Z; Wang W; Liang Y
[Ad] Endereço:Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University , Kowloon, Hong Kong 999077, China.
[Ti] Título:SO Initiates the Efficient Conversion of NO to HONO on MgO Surface.
[So] Source:Environ Sci Technol;51(7):3767-3775, 2017 Apr 04.
[Is] ISSN:1520-5851
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Nitrous acid (HONO) is an important source of hydroxyl radical (OH) that determines the fate of many chemically active and climate relevant trace gases. However, the sources and the formation mechanisms of HONO remain poorly understood. In this study, the effect of SO on the heterogeneous reactions of NO on MgO as a mineral dust surrogate was investigated. The reactivity of MgO to NO is weak, while coexisting SO can increase the uptake coefficients of NO on MgO by 2-3 orders of magnitude. The uptake coefficients of NO on SO -aged MgO are independent of NO concentrations in the range of 20-160 ppbv and relative humidity (0-70%RH). The reaction mechanism was demonstrated to be a redox reaction between NO and surface sulfite. In the presence of SO , NO was reduced to nitrite under dry conditions, which could be further converted to gas-phase HONO in humid conditions. These results suggest that the reductive effect of SO on the heterogeneous conversion of NO to HONO may have a significant contribution to the unknown sources of HONO observed in polluted areas (for example, in China).
[Mh] Termos MeSH primário: Nitritos
Ácido Nitroso
[Mh] Termos MeSH secundário: Poeira
Gases
Radical Hidroxila
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Dust); 0 (Gases); 0 (Nitrites); 3352-57-6 (Hydroxyl Radical); T2I5UM75DN (Nitrous Acid)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170608
[Lr] Data última revisão:
170608
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170302
[St] Status:MEDLINE
[do] DOI:10.1021/acs.est.6b05724


  6 / 675 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28081525
[Au] Autor:Zahedi S; Icaran P; Yuan Z; Pijuan M
[Ad] Endereço:Catalan Institute for Water Research (ICRA), Emili Grahit Street, 101, H(2)O Building, Scientific and Technological Park of the University of Girona, 17003 Girona, Spain. Electronic address: szahedi@icra.cat.
[Ti] Título:Effect of free nitrous acid pre-treatment on primary sludge at low exposure times.
[So] Source:Bioresour Technol;228:272-278, 2017 Mar.
[Is] ISSN:1873-2976
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The present study was undertaken to investigate the effect of different free nitrous acid (FNA) concentrations at low pre-treatment times (PTs) (1, 2 and 5h) and without pH control with mild agitation on primary sludge (PS) biodegradability and methane production (MP). Increasing PTs resulted in an increase in the solubility of the organic matter (around 25%), but not on cell-mortality (>75% in all the cases with FNA) and neither on methane generation. FNA pre-treatment at low PTs improve MP (around 16% at PT of 1h and 650mg N-NO /L). However, a similar improvement was found with mild agitation of PS without FNA at 2 and 5h. Taking into account the potential costs associated with the FNA pre-treatment, a mild agitation without FNA would be preferred to enhance MP in PS.
[Mh] Termos MeSH primário: Ácido Nitroso/farmacologia
Esgotos/química
[Mh] Termos MeSH secundário: Biodegradação Ambiental/efeitos dos fármacos
Análise da Demanda Biológica de Oxigênio
Biomassa
Reatores Biológicos
Concentração de Íons de Hidrogênio
Metano/biossíntese
Viabilidade Microbiana/efeitos dos fármacos
Nitritos/análise
Solubilidade
Fatores de Tempo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Nitrites); 0 (Sewage); OP0UW79H66 (Methane); T2I5UM75DN (Nitrous Acid)
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170817
[Lr] Data última revisão:
170817
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170113
[St] Status:MEDLINE


  7 / 675 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28004053
[Au] Autor:Zhao H; Du L
[Ad] Endereço:Environment Research Institute, Shandong University, Shanda South Road 27, 250100 Shandong, China. lindu@sdu.edu.cn.
[Ti] Título:Atmospheric implication of the hydrogen bonding interaction in hydrated clusters of HONO and dimethylamine in the nighttime.
[So] Source:Environ Sci Process Impacts;19(1):65-77, 2017 Jan 25.
[Is] ISSN:2050-7895
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:In this study, the stability of clusters formed by the trans- and cis-isomers of nitrous acid (HONO) with dimethylamine (DMA) and water has been characterized by density functional theory. The large red shifts of the OH-stretching transitions of both HONO isomers in the clusters indicate the formation of strong hydrogen bonds. At standard temperature and pressure, H O (acceptor) binds to HONO (donor) with binding energies of -25.0 to -24.6 kJ mol , less stable than those of DMA (acceptor) with HONO (donor) (-50.5 to -45.3 kJ mol ). Our findings indicate that hydration enhances proton transfer from HONO to DMA, and consequently increases the interaction strength (binding energies = -67.8 to -78.6 kJ mol ). The topological and generalized Kohn-Sham energy decomposition confirms strong hydrogen bond interactions. The clustering of HONO with DMA in the atmosphere is negligible as compared to the important H SO -DMA clusters.
[Mh] Termos MeSH primário: Poluentes Atmosféricos/química
Dimetilaminas/química
Ácido Nitroso/química
Água/química
[Mh] Termos MeSH secundário: Ligações de Hidrogênio
Periodicidade
Temperatura Ambiente
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Air Pollutants); 0 (Dimethylamines); 059QF0KO0R (Water); ARQ8157E0Q (dimethylamine); T2I5UM75DN (Nitrous Acid)
[Em] Mês de entrada:1702
[Cu] Atualização por classe:170817
[Lr] Data última revisão:
170817
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161223
[St] Status:MEDLINE
[do] DOI:10.1039/c6em00598e


  8 / 675 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27923477
[Au] Autor:Sun X; Guo Z; Yu M; Lin C; Sheng A; Wang Z; Linhardt RJ; Chi L
[Ad] Endereço:National Glycoengineering Research Center, Shandong Provincial Key Laboratory of Carbohydrate Chemistry and Glycobiology, State Key Laboratory of Microbial Technology, Shandong University, Jinan, Shandong 250100, China; Department of Chemistry and Chemical Biology, Department of Chemical and Biologi
[Ti] Título:Hydrophilic interaction chromatography-multiple reaction monitoring mass spectrometry method for basic building block analysis of low molecular weight heparins prepared through nitrous acid depolymerization.
[So] Source:J Chromatogr A;1479:121-128, 2017 Jan 06.
[Is] ISSN:1873-3778
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Low molecular weight heparins (LMWHs) are important anticoagulant drugs that are prepared through depolymerization of unfractionated heparin. Based on the types of processing reactions and the structures of the products, LMWHs can be divided into different classifications. Enoxaparin is prepared by benzyl esterification and alkaline depolymerization, while dalteparin and nadroparin are prepared through nitrous acid depolymerization followed by borohydride reduction. Compositional analysis of their basic building blocks is an effective way to provide structural information on heparin and LMWHs. However, most current compositional analysis methods have been limited to heparin and enoxaparin. A sensitive and comprehensive approach is needed for detailed investigation of the structure of LMWHs prepared through nitrous acid depolymerization, especially their characteristic saturated non-reducing end (NRE) and 2,5-anhydro-d-mannitol reducing end (RE). A maltose modified hydrophilic interaction column offers improved separation of complicated mixtures of acidic disaccharides and oligosaccharides. A total of 36 basic building blocks were unambiguously identified by high-resolution tandem mass spectrometry (MS). Multiple reaction monitoring (MRM) MS/MS quantification was developed and validated in the analysis of dalteparin and nadroparin samples. Each group of building blocks revealed different aspects of the properties of LMWHs, such as functional motifs required for anticoagulant activity, the structure of heparin starting materials, cleavage sites in the depolymerization reaction, and undesired structural modifications resulting from side reactions.
[Mh] Termos MeSH primário: Heparina de Baixo Peso Molecular/química
Heparina/química
Ácido Nitroso/química
[Mh] Termos MeSH secundário: Cromatografia Líquida
Heparina/metabolismo
Heparina Liase/metabolismo
Heparina de Baixo Peso Molecular/isolamento & purificação
Interações Hidrofóbicas e Hidrofílicas
Nadroparina/análise
Espectrometria de Massas em Tandem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Heparin, Low-Molecular-Weight); 0 (Nadroparin); 9005-49-6 (Heparin); EC 4.2.2.7 (Heparin Lyase); T2I5UM75DN (Nitrous Acid)
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170817
[Lr] Data última revisão:
170817
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161208
[St] Status:MEDLINE


  9 / 675 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27865665
[Au] Autor:Wu QL; Guo WQ; Bao X; Zheng HS; Yin RL; Feng XC; Luo HC; Ren NQ
[Ad] Endereço:State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China.
[Ti] Título:Enhanced volatile fatty acid production from excess sludge by combined free nitrous acid and rhamnolipid treatment.
[So] Source:Bioresour Technol;224:727-732, 2017 Jan.
[Is] ISSN:1873-2976
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:VFA production from excess sludge (ES) was greatly enhanced by a low-cost and high-efficient treatment: 0.67mg/L free nitrous acid (FNA) pretreatment combined with 0.04g/g TSS rhamnolipid (RL) addition (FNA+RL), which significantly shortened fermentation time to 3days and increased VFA production to 352.26mgCOD/g VSS (5.42 times higher than raw ES). Propionic and acetic acids were the two leading components (71.86% of the total VFA). Mechanism investigation manifested FNA+RL improved the biodegradability of ES, achieved positive synergetic effect on solubilization, hydrolysis and acidification efficiencies, and inhibited methanation. Microbial community distribution further explained the above phenomena. The bacteria related to polysaccharides/protein utilization and VFA generation, including Clostridium, Megasphaera and Proteiniborus, were mainly observed in FNA+RL, whereas gas-forming bacteria Anaerolineae and acid-consuming bacteria Proteobacteria were assuredly suppressed. Besides, Propionibacterineae associated with propionic acid generation was exclusively enriched in sole RL and FNA+RL.
[Mh] Termos MeSH primário: Ácidos Graxos Voláteis/biossíntese
Glicolipídeos/química
Consórcios Microbianos/fisiologia
Ácido Nitroso/química
Esgotos
[Mh] Termos MeSH secundário: Bactérias/metabolismo
Biodegradação Ambiental
Análise da Demanda Biológica de Oxigênio
Biotecnologia/economia
Biotecnologia/métodos
Fermentação
Hidrólise
Propionatos/metabolismo
Proteínas/metabolismo
Esgotos/microbiologia
Solubilidade
Eliminação de Resíduos Líquidos/métodos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Fatty Acids, Volatile); 0 (Glycolipids); 0 (Propionates); 0 (Proteins); 0 (Sewage); 0 (rhamnolipid); JHU490RVYR (propionic acid); T2I5UM75DN (Nitrous Acid)
[Em] Mês de entrada:1702
[Cu] Atualização por classe:170217
[Lr] Data última revisão:
170217
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161121
[St] Status:MEDLINE


  10 / 675 MEDLINE  
              first record previous record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27837317
[Au] Autor:Kinh CT; Ahn J; Suenaga T; Sittivorakulpong N; Noophan P; Hori T; Riya S; Hosomi M; Terada A
[Ad] Endereço:Department of Chemical Engineering, Tokyo University of Agriculture & Technology, 2-24-16 Naka, Koganei, Tokyo, 184-8588, Japan.
[Ti] Título:Free nitrous acid and pH determine the predominant ammonia-oxidizing bacteria and amount of N O in a partial nitrifying reactor.
[So] Source:Appl Microbiol Biotechnol;101(4):1673-1683, 2017 Feb.
[Is] ISSN:1432-0614
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:We investigated the effects of free ammonia (FA) and free nitrous acid (FNA) concentrations on the predominant ammonia-oxidizing bacteria (AOB) and the emission of nitrous oxide (N O) in a lab-scale sequencing batch reactor for partial nitrification. The reactor was operated with stepwise increases in the NH loading rate, which resulted in a maximum FA concentration of 29.3 mg-N/L at pH 8.3. Afterwards, FNA was increased by a gradual decrease of pH, reaching its maximum concentration of 4.1 mg-N/L at pH 6.3. Fluorescence in situ hybridization indicated that AOB remained predominant during the operation, achieving specific nitrification rates of 1.04 and 0.99 g-N/g-VSS/day at the highest accumulations of FA and FNA, respectively. These rates were in conjunction with partial nitrification efficiencies of >84%. The N O emission factor of oxidized NH was 0.90% at pH 7.0, which was higher than those at pH 8.3 (0.11%) and 6.3 (0.12%), the pHs with the maximum FA and FNA concentrations, respectively. High-throughput sequencing of 16S ribosomal RNA genes showed that increases in FNA drastically changed the predominant AOB species, although increased FA produced no significant changes. This study demonstrates that the FNA concentration and pH are the main drivers that determine the predominant AOB species and N O-emission in a partial nitrifying bioreactor.
[Mh] Termos MeSH primário: Amônia/metabolismo
Ácido Nitroso/metabolismo
[Mh] Termos MeSH secundário: Bactérias/metabolismo
Reatores Biológicos/microbiologia
Concentração de Íons de Hidrogênio
Nitrificação
Óxido Nitroso/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
7664-41-7 (Ammonia); K50XQU1029 (Nitrous Oxide); T2I5UM75DN (Nitrous Acid)
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170308
[Lr] Data última revisão:
170308
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161113
[St] Status:MEDLINE
[do] DOI:10.1007/s00253-016-7961-2



página 1 de 68 ir para página                         
   


Refinar a pesquisa
  Base de dados : MEDLINE Formulário avançado   

    Pesquisar no campo  
1  
2
3
 
           



Search engine: iAH v2.6 powered by WWWISIS

BIREME/OPAS/OMS - Centro Latino-Americano e do Caribe de Informação em Ciências da Saúde