Base de dados : MEDLINE
Pesquisa : G02.111.071 [Categoria DeCS]
Referências encontradas : 762 [refinar]
Mostrando: 1 .. 10   no formato [Detalhado]

página 1 de 77 ir para página                         

  1 / 762 MEDLINE  
              next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29117591
[Au] Autor:Zhai S; Ji M; Zhao Y; Pavlostathis SG; Zhao Q
[Ad] Endereço:School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China; School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0512, United States.
[Ti] Título:Effects of salinity and COD/N on denitrification and bacterial community in dicyclic-type electrode based biofilm reactor.
[So] Source:Chemosphere;192:328-336, 2018 Feb.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:A dicyclic-type electrode based biofilm electrode reactor (BER) was developed for advanced nitrate removal from saline municipal wastewater. The denitrification efficiency was evaluated with a synthetic feed (NO -N, 20 mg L ) under different salinity and COD to nitrogen ratios (COD/N). As the salinity increased from 0% to 1.0%, the denitrification performance of both the traditional biofilm reactor (BR) and BER was inhibited; however, the BER showed better adaptation and ability to recover. The BER achieved a high nitrate removal efficiency (≥90%) at a salinity of 1.0% and a low COD/N of 2.5 (theoretical stoichiometric 2.86 ignoring microbial growth). The abundance of Methylotenera mobilis in BR and Clostridium sticklandii in BER was higher than in the initial sludge sample used as inoculum. Likewise, the abundance of napA, nirS and nosZ genes increased as the COD/N further decreased. Under high salinity stress, the BER had a higher denitrification efficiency and the consumption of the organic carbon source (i.e., methanol) was reduced compared to BR. The cooperation between heterotrophic and autotrophic denitrifiers in the BER system provides a more efficient and feasible solution for nitrate removal from saline municipal wastewater.
[Mh] Termos MeSH primário: Biofilmes
Reatores Biológicos/microbiologia
Desnitrificação
Salinidade
[Mh] Termos MeSH secundário: Processos Autotróficos
Reatores Biológicos/normas
Processos Heterotróficos
Nitratos/isolamento & purificação
Nitrogênio/análise
Esgotos/microbiologia
Águas Residuais/química
Purificação da Água/métodos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Nitrates); 0 (Sewage); 0 (Waste Water); N762921K75 (Nitrogen)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180212
[Lr] Data última revisão:
180212
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171109
[St] Status:MEDLINE


  2 / 762 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28934270
[Au] Autor:Laut L; Martins MVA; Frontalini F; Ballalai JM; Belart P; Habib R; Fontana LF; Clemente IMMM; Lorini ML; Mendonça Filho JG; Laut VM; Figueiredo MSL
[Ad] Endereço:Laboratório de Micropaleontologia - LabMicro, Universidade Federal do Estado do Rio de Janeiro - UNIRIO, Rio de Janeiro, Rio de Janeiro, Brazil.
[Ti] Título:Assessment of the trophic state of a hypersaline-carbonatic environment: Vermelha Lagoon (Brazil).
[So] Source:PLoS One;12(9):e0184819, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Vermelha Lagoon is a hypersaline shallow transitional ecosystem in the state of Rio de Janeiro (Brazil). This lagoon is located in the protected area of Massambaba, between the cities of Araruama and Saquarema (Brazil), and displays two quite uncommon particularities: it exhibits carbonate sedimentation and displays the development of Holocene stromatolites. Due to both particularities, the salt industry and property speculation have been, increasingly, generating anthropic pressures on this ecosystem. This study aims to apply a multiproxy approach to evaluate the trophic state of Vermelha Lagoon based on physicochemical parameters and geochemical data for the quantification and qualification of organic matter (OM), namely total organic carbon (TOC), total sulfur (TS), total phosphorus (TP) and biopolymeric carbon (BPC), including carbohydrates (CHO), lipids (LIP) and proteins (PTN). The CHO/TOC ratio values suggest that OM supplied to the sediment is of autochthonous origin and results, essentially, from microbial activity. The cluster analyses allowed the identification of four regions in Vermelha Lagoon. The Region I included stations located in shallow areas of the eastern sector of Vermelha lagoon affected by the impact of the artificial channel of connection with Araruama Lagoon. The Region II, under the influence of salt pans, is characterized by the highest values of BPC, namely CHO promoted by microbiological activity. The Region III include stations spread through the lagoon with high values of dissolved oxygen and lower values of TP. Stromatolites and microbial mattes growth was observed in some stations of this sector. Region IV, where the highest values of TOC and TS were found, represents depocenters of organic matter, located in general in depressed areas. Results of this work evidences that the Vermelha Lagoon is an eutrophic but alkaline and well oxygenated environment (at both water column and surface sediment) where the autotrophic activity is greater than heterotrophic one. These particular conditions make this a special and rare ecosystem.
[Mh] Termos MeSH primário: Ecossistema
Sedimentos Geológicos/química
Águas Salinas/química
[Mh] Termos MeSH secundário: Processos Autotróficos
Brasil
Carboidratos/química
Carbono/química
Análise por Conglomerados
Sedimentos Geológicos/microbiologia
Concentração de Íons de Hidrogênio
Lipídeos/química
Oxigênio/química
Fósforo/química
Proteínas/química
Sais/química
Enxofre/química
Temperatura Ambiente
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Carbohydrates); 0 (Lipids); 0 (Proteins); 0 (Salts); 27YLU75U4W (Phosphorus); 70FD1KFU70 (Sulfur); 7440-44-0 (Carbon); S88TT14065 (Oxygen)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171024
[Lr] Data última revisão:
171024
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170922
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0184819


  3 / 762 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28875900
[Au] Autor:Kojima H; Watanabe M; Fukui M
[Ad] Endereço:1​The Institute of Low Temperature Science, Hokkaido University, Kita-19, Nishi-8, Kita-ku, Sapporo 060-0819, Japan.
[Ti] Título:Sulfurivermis fontis gen. nov., sp. nov., a sulfur-oxidizing autotroph, and proposal of Thioprofundaceae fam. nov.
[So] Source:Int J Syst Evol Microbiol;67(9):3458-3461, 2017 Sep.
[Is] ISSN:1466-5034
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:A novel Gram-stain-negative, chemolithoautotrophic sulfur oxidizer, strain JG42T, was isolated from a hot spring microbial mat. As an electron donor for autotrophic growth, strain JG42T utilized sulfide, thiosulfate, tetrathionate and elemental sulfur. Cells of strain JG42T were oxidase-positive and catalase-negative. The G+C content of the genomic DNA was 65 mol%. The predominant cellular fatty acid was C16 : 0. Phylogenetic analysis of the 16S rRNA gene indicated that strain JG42T belonged to the order Chromatiales, but sequence similarities to the known species were less than 94 %. On the basis of its properties, strain JG42T (=DSM 104776T=NBRC 112696T) is proposed as the type strain of a novel species of a new genus, Sulfurivermis fontis gen. nov., sp. nov., which belongs to the family Thioalkalispiraceae. A new family, Thioprofundaceae fam. nov., is also proposed to accommodate the genus Thioprofundum, transferred from the family Thioalkalispiraceae.
[Mh] Termos MeSH primário: Gammaproteobacteria/classificação
Fontes Termais/microbiologia
Filogenia
Bactérias Redutoras de Enxofre/classificação
Enxofre/metabolismo
[Mh] Termos MeSH secundário: Processos Autotróficos
Técnicas de Tipagem Bacteriana
Composição de Bases
DNA Bacteriano/genética
Ácidos Graxos/química
Gammaproteobacteria/genética
Gammaproteobacteria/isolamento & purificação
Japão
RNA Ribossômico 16S/genética
Análise de Sequência de DNA
Bactérias Redutoras de Enxofre/genética
Bactérias Redutoras de Enxofre/isolamento & purificação
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (DNA, Bacterial); 0 (Fatty Acids); 0 (RNA, Ribosomal, 16S); 70FD1KFU70 (Sulfur)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170920
[Lr] Data última revisão:
170920
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170907
[St] Status:MEDLINE
[do] DOI:10.1099/ijsem.0.002137


  4 / 762 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28838232
[Au] Autor:Chen HH; Jiang JG
[Ad] Endereço:College of Food Science and Engineering, South China University of Technology , Guangzhou, Guangdong 510640, People's Republic of China.
[Ti] Título:Lipid Accumulation Mechanisms in Auto- and Heterotrophic Microalgae.
[So] Source:J Agric Food Chem;65(37):8099-8110, 2017 Sep 20.
[Is] ISSN:1520-5118
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Microalgae lipids have attracted great attention in the world as a result of their potential use for biodiesel productions. Microalgae are cultivated in photoautotrophic conditions in most cases, but several species are able to grow under heterotrophic conditions, in which microalgae are cultivated in the dark where the cell growth and reproduction are supported by organic carbons. This perspective is covering the related studies concerning the difference between hetero- and autotrophic cultivation of microalgae. The auto- and heterotrophic central carbon metabolic pathways in microalgae are described, and the catalyzing reactions of several key metabolic enzymes and their corresponding changes in the protein level are summarized. Under adverse environmental conditions, such as nutrient deprivation, microalgae have the ability to highly store energy by forming triacylglycerol (TAG), the reason for which is analyzed. In addition, the biosynthesis of fatty acids and TAGs and their difference between auto- and heterotrophic conditions are compared at the molecular level. The positive regulatory enzymes, such as glucose transporter protein, fructose-1,6-bisphosphate aldolase, and glycerol-3-phosphate dehydrogenase, and the negative regulation enzymes, such as triose phosphate isomerase, played a crucial role in the lipid accumulation auto- and heterotrophic conditions.
[Mh] Termos MeSH primário: Lipídeos/biossíntese
Microalgas/metabolismo
[Mh] Termos MeSH secundário: Processos Autotróficos
Ácidos Graxos/biossíntese
Processos Heterotróficos
Microalgas/crescimento & desenvolvimento
Triglicerídeos/biossíntese
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Nm] Nome de substância:
0 (Fatty Acids); 0 (Lipids); 0 (Triglycerides)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171113
[Lr] Data última revisão:
171113
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170826
[St] Status:MEDLINE
[do] DOI:10.1021/acs.jafc.7b03495


  5 / 762 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28780263
[Au] Autor:Tong S; Stocks JL; Rodriguez-Gonzalez LC; Feng C; Ergas SJ
[Ad] Endereço:School of Water Resources and Environment, China University of Geosciences Beijing, Beijing 100083, China; Department of Civil and Environmental Engineering, University of South Florida, 4202 E. Fowler Ave, ENB 118, Tampa, FL 33620, USA.
[Ti] Título:Effect of oyster shell medium and organic substrate on the performance of a particulate pyrite autotrophic denitrification (PPAD) process.
[So] Source:Bioresour Technol;244(Pt 1):296-303, 2017 Nov.
[Is] ISSN:1873-2976
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The use of pyrite as an electron donor for biological denitrification has the potential to reduce alkalinity consumption and sulfate by-product production compared with sulfur oxidizing denitrification. This research investigated the effects of oyster shell and organic substrate addition on the performance of a particulate pyrite autotrophic denitrification (PPAD) process. Side-by-side bench-scale studies were carried out in upflow packed bed bioreactors with pyrite and sand, with and without oyster shells as an alkalinity source. Organic carbon addition (10% by volume wastewater) was found to improve PPAD denitrification performance, possibly by promoting mixotrophic metabolism. After organic carbon addition and operation at a six-hour empty bed contact time, total inorganic nitrogen (TIN) removal reached 90% in the column with oyster shells compared with 70% without. SEM images and biofilm protein measurements indicated that oyster shells enhanced biofilm growth. The results indicate that PPAD is a promising technology for treatment of nitrified wastewater.
[Mh] Termos MeSH primário: Reatores Biológicos
Desnitrificação
Ostreidae
[Mh] Termos MeSH secundário: Animais
Processos Autotróficos
Ferro
Nitratos
Sulfetos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Nitrates); 0 (Sulfides); 132N09W4PR (pyrite); E1UOL152H7 (Iron)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171103
[Lr] Data última revisão:
171103
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170807
[St] Status:MEDLINE


  6 / 762 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28709076
[Au] Autor:Dasgupta S; Wu S; Goel R
[Ad] Endereço:Department of Civil and Environmental Engineering, University of Utah, Salt Lake City, UT 84112, United States.
[Ti] Título:Coupling autotrophic denitrification with partial nitritation-anammox (PNA) for efficient total inorganic nitrogen removal.
[So] Source:Bioresour Technol;243:700-707, 2017 Nov.
[Is] ISSN:1873-2976
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The performance of and the microbial ecology in an integrated lab scale set up comprising of a PN/A bioreactor and an elemental sulfur-supported packed bed autotrophic denitrification (ESSAD) are reported. The PN/A reactor exhibited an average removal rate of 0.56±0.103kgNm d , whereas the ESSAD reactor removed an average of 0.0018kg NO -Nm d . The combined average removal rate was 0.6kgNm d , yielding an overall total inorganic nitrogen efficiency of 97%. Based on 16S rRNA gene clone libraries from the ESSAD reactor, the extracted Operational Taxonomic Units (OTUs) formed a clade with Thiobacillus denitrificans sp. indicating a common ancestral relationship. High throughput amplicon sequencing targeting V3 region of 16S rRNA gene for the biofilm in the ESSAD also revealed an abundance of the Thiobacillus genus. Additionally, 16s rRNA amplicon sequencing of the genomic DNA from the PN/A reactor reflected a dominance of the Planctomycetes phylum.
[Mh] Termos MeSH primário: Desnitrificação
RNA Ribossômico 16S
[Mh] Termos MeSH secundário: Processos Autotróficos
Bactérias/genética
Reatores Biológicos
Nitrogênio
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (RNA, Ribosomal, 16S); N762921K75 (Nitrogen)
[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:170715
[St] Status:MEDLINE


  7 / 762 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28692936
[Au] Autor:Renard H; Maro D; Le Dizès S; Escobar-Gutiérrez A; Voiseux C; Solier L; Hébert D; Rozet M; Cossonnet C; Barillot R
[Ad] Endereço:Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PRP-ENV/SERIS/LRC, Laboratoire de Radioécologie de Cherbourg Octeville, Cherbourg-Octeville, 50130, France. Electronic address: hugo.renard@irsn.fr.
[Ti] Título:Tritium forms discrimination in ryegrass under constant tritium exposure: From seed germination to seedling autotrophy.
[So] Source:J Environ Radioact;177:194-205, 2017 Oct.
[Is] ISSN:1879-1700
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Uncertainties remain regarding the fate of atmospheric tritium after it has been assimilated in grasslands (ryegrass) in the form of TFWT (Tissue Free Water Tritium) or OBT (Organically Bound Tritium). One such uncertainty relates to the tritium forms discrimination during transfer from TFWT to OBT resulting from photosynthesis (OBT ), corresponding to the OBT /TFWT ratio. In this study, the OBT/TFWT ratio is determined by experiments in the laboratory using a ryegrass model and hydroponic cultures, with constant activity of tritium in the form of tritiated water (denoted as HTO) in the "water" compartment (liquid HTO) and "air" compartment (HTO vapour in the air). The OBT /TFWT ratio and the exchangeable OBT fraction are measured for three parts of the plant: the leaf, seed and root. Plant growth is modelled using dehydrated biomass measurements taken over time in the laboratory and integrating physiological functions of the plant during the first ten days after germination. The results suggest that there is no measurable discrimination of tritium in the plant organic matter produced by photosynthesis.
[Mh] Termos MeSH primário: Germinação/efeitos da radiação
Lolium/efeitos da radiação
Plântulas/efeitos da radiação
Trítio/toxicidade
Poluentes Radioativos da Água/toxicidade
[Mh] Termos MeSH secundário: Processos Autotróficos
Fotossíntese/efeitos da radiação
Monitoramento de Radiação
Trítio/análise
Poluentes Radioativos da Água/análise
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Water Pollutants, Radioactive); 10028-17-8 (Tritium)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170908
[Lr] Data última revisão:
170908
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170711
[St] Status:MEDLINE


  8 / 762 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28675843
[Au] Autor:Blázquez E; Gabriel D; Baeza JA; Guisasola A
[Ad] Endereço:GENOCOV, Department of Chemical, Biological and Environmental Engineering, School of Engineering, Universitat Autònoma de Barcelona, 08193, Bellaterra, Barcelona, Spain.
[Ti] Título:Evaluation of key parameters on simultaneous sulfate reduction and sulfide oxidation in an autotrophic biocathode.
[So] Source:Water Res;123:301-310, 2017 Oct 15.
[Is] ISSN:1879-2448
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Bioelectrochemical systems (BESs) are being studied as an alternative technology for the treatment of several kinds of wastewaters with a lack of electron donor such as high-strength sulfate wastewaters. This study evaluates different parameters that influence the simultaneous sulfate reduction and sulfide oxidation in an autotrophic biocathode: ion-exchange membrane (IEM), cathodic pH and cathode potential. Two different membranes were studied to evaluate sulfate and sulfide adsorption and diffusion from the cathode to the anode, observing that a cation-exchange membrane (CEM) widely decreased these effects. Three different cathode pH (5.5, 7 and 8.5) were studied in a long-term operation observing that pH = 7 was the optimal for sulfate removal, achieving reduction rates around 150 mg S-SO L d . Microbial community analysis of the cathode biofilm demonstrated a high abundance of sulfate-reducing bacteria (SRB, 67% at pH 7, 60% at pH 8.5 and 42% at pH 5.5), mainly Desulfovibrio sp. at pH 5.5 and 7 and Desulfonatronum sp. at pH 8.5. The cathode potential also was studied from -0.7 to -1.2 V vs. SHE achieving sulfate removal rates higher than 700 mg S-SO L d at cathode potentials from -1.0 to -1.2 V vs. SHE. Also, the highest cathodic recovery and the highest sulfur species imbalance were observed at a cathode potential of -1.0 V vs. SHE, which indicated a higher elemental sulfur production.
[Mh] Termos MeSH primário: Bactérias
Sulfatos/química
Sulfetos/química
[Mh] Termos MeSH secundário: Processos Autotróficos
Oxirredução
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Sulfates); 0 (Sulfides)
[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:170705
[St] Status:MEDLINE


  9 / 762 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28599225
[Au] Autor:Wang S; Wang L; Deng L; Zheng D; Zhang Y; Jiang Y; Yang H; Lei Y
[Ad] Endereço:Biogas Institute of Ministry of Agriculture, Chengdu 610041, China; Laboratory of Development and Application of Rural Renewable Energy, Chengdu 610041, China.
[Ti] Título:Performance of autotrophic nitrogen removal from digested piggery wastewater.
[So] Source:Bioresour Technol;241:465-472, 2017 Oct.
[Is] ISSN:1873-2976
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The performance of an autotrophic nitrogen removal process to treat digested piggery wastewater (DPW) was investigated by gradually shortening the HRT and enhancing the DPW concentration during 390days of operation. The results showed that the total nitrogen removal rate and efficiency reached 3.9kg-Nm day and 73%, which were significantly higher than the levels reported previously. A high relative abundance of Nitrosomonas (4.2%) and functional microbes (12.15%) resulted in a high aerobic ammonium oxidizing activity (1.25±0.1g-NgVSS d ), and a good settling ability (SVI, 78.42mLg SS) resulted in a high sludge concentration (VSS, 11.01gL ), which laid a solid foundation for the excellent performance. High-throughput pyrosequencing indicated that, compared with synthetic wastewater, the DPW decreased the relative abundances of every functional group of nitrogen removal microbes, and increased relative abundances of anaerobes (15.7%), sulfur-oxidizing bacteria (9.4%) and methanogens (40.8%).
[Mh] Termos MeSH primário: Processos Autotróficos
Desnitrificação
[Mh] Termos MeSH secundário: Reatores Biológicos
Nitrogênio
Eliminação de Resíduos Líquidos
Águas Residuais
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Waste Water); N762921K75 (Nitrogen)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171106
[Lr] Data última revisão:
171106
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170610
[St] Status:MEDLINE


  10 / 762 MEDLINE  
              first record previous record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28475996
[Au] Autor:Di Capua F; Milone I; Lakaniemi AM; Hullebusch EDV; Lens PNL; Esposito G
[Ad] Endereço:Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, via Gaetano di Biasio 43, 03043 Cassino (FR), Italy; Department of Chemistry and Bioengineering, Tampere University of Technology, P.O. Box 541, FI-33101 Tampere, Finland. Electronic address: f.dicapua@unicas.i
[Ti] Título:Effects of different nickel species on autotrophic denitrification driven by thiosulfate in batch tests and a fluidized-bed reactor.
[So] Source:Bioresour Technol;238:534-541, 2017 Aug.
[Is] ISSN:1873-2976
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Nickel is a common heavy metal and often occurs with nitrate (NO ) in effluents from mining and metal-finishing industry. The present study investigates the effects of increasing concentrations (5-200mgNi/L) of NiEDTA and NiCl on autotrophic denitrification with thiosulfate (S O ) in batch tests and a fluidized-bed reactor (FBR). In batch bioassays, 50 and 100mgNi/L of NiEDTA only increased the transient accumulation of NO , whereas 25-100mgNi/L of NiCl inhibited denitrification by 9-19%. NO and NO were completely removed in the FBR at feed NiEDTA and NiCl concentrations as high as 100 and 200mgNi/L, respectively. PCR-DGGE revealed the dominance of Thiobacillus denitrificans and the presence of the sulfate-reducing bacterium Desulfovibrio putealis in the FBR microbial community at all feed nickel concentrations investigated. Nickel mass balance, thermodynamic modeling and solid phase characterization indicated that nickel sulfide, phosphate and oxide precipitated in the FBR during NiCl injection.
[Mh] Termos MeSH primário: Reatores Biológicos
Desnitrificação
Níquel/química
[Mh] Termos MeSH secundário: Processos Autotróficos
Nitratos
Tiossulfatos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Nitrates); 0 (Thiosulfates); 7OV03QG267 (Nickel)
[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:170506
[St] Status:MEDLINE



página 1 de 77 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