The Experts below are selected from a list of 69237 Experts worldwide ranked by ideXlab platform
Liping Zhao - One of the best experts on this subject based on the ideXlab platform.
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versatile Aromatic Compound degrading capacity and microdiversity of thauera strains isolated from a coking wastewater treatment bioreactor
Journal of Industrial Microbiology & Biotechnology, 2010Co-Authors: Xiaojun Zhang, Huihui Zhong, Liping ZhaoAbstract:Bacteria of the Thauera genus have been described as important Aromatic Compound degraders and have attracted increased attention. In this study, three Thauera strains (Q4, Q20-C, and 3–35) were isolated from a coking wastewater treatment plant (WWTP) with a high abundance of Thauera. The 16S rRNA, nitrite reductase, and phenol hydroxylase (LmPH) genes and pollutant-degrading capacity of these strains were characterized and compared. Their 16S rRNA gene sequences were identical, but the genomic structures differed, as demonstrated by distinct enterobacterial repetitive intergenic consensus sequence PCR profiles with a similarity of less than 0.65. The analysis of degradation of coking wastewater by these strains showed that most of the main organic pollutants—phenol, methylphenol, and indole, but not quinoline—were degraded under aerobic conditions. These strains contained different LmPHs genes and showed different phenol degradation rates (Q4 > 3–35 > Q20-C). The presence of a microdiversity of Thauera spp. implies the existence of various finely differentiated niches in the industrial WWTP. The capacity of the Thauera strains to degrade a wide spectrum of Aromatic Compounds suggests their potential in bioremediation applications targeting Aromatic pollutant-containing wastewater.
Eliseo Ranzi - One of the best experts on this subject based on the ideXlab platform.
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A wide range kinetic modeling study of pyrolysis and oxidation of benzene
Combustion and Flame, 2013Co-Authors: Chiara Saggese, Alberto Cuoci, Tiziano Faravelli, Alessio Frassoldati, Eliseo RanziAbstract:The aim of this work is to collect and review the vast amount of experimental data reported in recent years on benzene pyrolysis and oxidation and to analyze them by using and refining a detailed kinetic mechanism, thereby identifying a sensitive and crucial portion of the mechanism itself. Benzene is the first Aromatic Compound, a relevant intermediate of several combustion processes and also a key precursor to soot formation. The emphasis here is on high pressure pyrolysis experiments, ignition delay times in shock tubes, premixed flames as well as low temperature reactions with recombination and propagation reactions of cyclopentadienyl and phenoxy radicals playing a significant role. This is the first time the same kinetic model of benzene pyrolysis and oxidation has been compared with such a wide collection of experimental measurements. © 2013 The Combustion Institute.
Stijn F L Mertens - One of the best experts on this subject based on the ideXlab platform.
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potential driven molecular tiling of a charged polycyclic Aromatic Compound
Chemical Communications, 2014Co-Authors: Oleksandr Ivasenko, Kunal S Mali, Dongqing Wu, Xinliang Feng, Klaus Mullen, S De Feyter, Stijn F L MertensAbstract:Using in situ electrochemical scanning tunnelling microscopy (EC-STM), we demonstrate fully reversible tuning of molecular tiling between self-assembled structures with supramolecular motifs containing 2, 3, 4, 6 or 7 tectons. The structures can be explained by electrocompression of the cationic adlayer at the solid–liquid interface.
Pierre Faure - One of the best experts on this subject based on the ideXlab platform.
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fenton like and potassium permanganate oxidations of pah contaminated soils impact of oxidant doses on pah and polar pac polycyclic Aromatic Compound behavior
Chemosphere, 2019Co-Authors: Marine Boulangé, Coralie Biache, Catherine Lorgeoux, Alain Saada, Pierre FaureAbstract:Potassium permanganate and Fenton-like oxidations were applied on two PAH-contaminated soils collected on former coking plant and gas plant sites. The impact of oxidant dose on the polycyclic Aromatic Compound (PAC) evolution, including 16 US-EPA PAHs, 11 oxygenated- and 4 nitrogen heterocyclic-PACs (O- and N-PACs) was studied for both treatments. The content of extractable organic matter and PACs was determined prior and after oxidation. Overall, permanganate treatment was more efficient than Fenton-like to decrease the PAH content, this latter being limited by the contamination availability. However, permanganate treatment resulted in incomplete PAH degradation, leading to the formation of O-PACs, that was limited with the application of higher dose. It underlines the importance of the dose and the oxidant type in the selection of oxidation parameters for remediation purpose, as improper use of oxidant can lead to the accumulation of oxidation by-products that could be as toxic as the parent Compounds.
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Aging as the main factor controlling PAH and polar-PAC (polycyclic Aromatic Compound) release mechanisms in historically coal-tar-contaminated soils
Environmental Science and Pollution Research, 2019Co-Authors: Marine Boulangé, Coralie Biache, Catherine Lorgeoux, Raymond Michels, Julien Michel, Pierre FaureAbstract:In industrial sites, historically contaminated by coal tar (abandoned coking and manufactured gas plants), other families of organic pollutants than the 16 PAHs (polycyclic Aromatic hydrocarbons) classified by the US-EPA can occur and induce potential risk for groundwater resources. Polar PACs (polycyclic Aromatic Compounds), especially oxygenated and nitrogenated PACs (O-PACs and N-PACs), are present in the initial pollution and can also be generated over time (i.e., O-PACs). Their aqueous solubilities are much greater than those of the PAHs. For these reasons, we need to increase our knowledge on polar PACs in order to better predict their behavior and the potential on-site risk. Batch leaching tests were carried out under various conditions of temperature, ionic strength, and availability of pollutants to determine the mechanisms and key parameters controlling their release. The results show a release of low-molecular-weight PAHs and polar PACs mainly by dissolution, while higher molecular weight PAHs are mainly released in association with colloids. Aging mainly controls the former mechanism, and ionic strength mainly controls the latter. Temperature increased both dissolution and colloidal mobilization. The Raoult law predicts the PAC equilibrium concentration for soils presenting high pollutant availability, but this law overestimates PAC concentration in aged soils (low pollutant availability). This is mainly due to limitation of PAC diffusion within coal-tar particles with aging. The most soluble PACs (especially polar PACs) are the most sensitive to aging. For better prediction of the PAC behavior in soils and water resources management, aging needs to be taken into account.
Xiaojun Zhang - One of the best experts on this subject based on the ideXlab platform.
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versatile Aromatic Compound degrading capacity and microdiversity of thauera strains isolated from a coking wastewater treatment bioreactor
Journal of Industrial Microbiology & Biotechnology, 2010Co-Authors: Xiaojun Zhang, Huihui Zhong, Liping ZhaoAbstract:Bacteria of the Thauera genus have been described as important Aromatic Compound degraders and have attracted increased attention. In this study, three Thauera strains (Q4, Q20-C, and 3–35) were isolated from a coking wastewater treatment plant (WWTP) with a high abundance of Thauera. The 16S rRNA, nitrite reductase, and phenol hydroxylase (LmPH) genes and pollutant-degrading capacity of these strains were characterized and compared. Their 16S rRNA gene sequences were identical, but the genomic structures differed, as demonstrated by distinct enterobacterial repetitive intergenic consensus sequence PCR profiles with a similarity of less than 0.65. The analysis of degradation of coking wastewater by these strains showed that most of the main organic pollutants—phenol, methylphenol, and indole, but not quinoline—were degraded under aerobic conditions. These strains contained different LmPHs genes and showed different phenol degradation rates (Q4 > 3–35 > Q20-C). The presence of a microdiversity of Thauera spp. implies the existence of various finely differentiated niches in the industrial WWTP. The capacity of the Thauera strains to degrade a wide spectrum of Aromatic Compounds suggests their potential in bioremediation applications targeting Aromatic pollutant-containing wastewater.