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Microbial communities biostimulated by ethanol during uranium （VI） bioremediation in contaminated sediment as shown by stable isotope probing

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Frontiers of Environmental Science & Engineering 2015年第3期9卷 453-464页

作者： Mary Beth LEIGH Wei-Min WU erick cardenas Ondrej UHLIK Sue CARROLL Terry GENTRY Terence L. MARSH Jizhong ZHOU Philip JARDINE Craig S. CRIDDLE James M. TIEDJE Center for Microbial Ecology Michigan State University East Lansing MI 48824 USA Institute of Arctic Biology University of Alaska Fairbanks Fairbanks AK 99775 USA Department of Civil and Environmental Engineering Center for Sustainable Development & Global Competitiveness Codiga Resource Recovery Center Stanford University Stanford CA 94305-4020 USA Department of Biochemistry and Microbiology Institute of Chemical Technology Prague Technicka 3 166 28 Prague Czech Republic Environmental Sciences Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA Department of Botany and Microbiology University of Oklahoma Norman OK 73019 USA Department of Crop and Soil Sciences Texas A&M University College Station TX 77843 USA

Stable isotope probing （SIP） was used to identify microbes stimulated by ethanol addition in microcosms containing two sediments collected from the bioremediation test zone at the US Department of Energy Oak Ridge site, TN, USA. One sample was highly bioreduced with ethanol while another was less reduced. Microcosms with the respective sediments were amended with ^13C labeled ethanol and incubated for 7 days for SIP. Ethanol was rapidly converted to acetate within 24h accompanied with the reduction of nitrate and sulfate. The accumulation of acetate persisted beyond the 7 d period. Aqueous U did not decline in the microcosm with the reduced sediment due to desorption of U but continuously declined in the less reduced sample. Microbial growth and concomitant 13C-DNA production was detected when ethanol was exhausted and abundant acetate had accumulated in both microcosms. This coincided with U（VI） reduction in the less reduced sample. I3C originating from ethanol was ultimately utilized for growth, either directly or indirectly, by the dominant microbial community members within 7 days of incubation. The microbial community was comprised predominantly of known denitrifiers, sulfate-reducing bacteria and iron （Ⅲ） reducing bacteria including Desulfovibrio, Sphingomonas, Ferribacterium, Rhodanobacter, Geothrix, Thiobacillus and others, including the known U（VI）-redueing bacteria Acidovorax, Anaeromyxobacter, Desulfovibrio, Geobac- ter and Desulfosporosinus. The findings suggest that ethanol biostimulates the U（VI）-reducing microbial com- munity by first serving as an electron donor for nitrate, sulfate, iron （IH） and U（VI） reduction, and acetate which then functions as electron donor for U（VI） reduction and carbon source for microbial growth.

关键词： Stable isotope probing (S/P) ethanol acetate uranium reduction sediment bioremediation

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地下水铀污染的原位微生物还原与固定：在美国能源部田纳西橡树岭放射物污染现场的试验

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环境科学学报 2011年第3期31卷 449-459页

作者：吴唯民 Jack Carley David Watson 顾宝华 Scott Brooks Shelly D.Kelly Kenneth Kemner Joy D.van Nostrand 吴力游许玫英周集中罗剑 erick cardenas 黄家琪 Matthew W.Fields Terence L.Marsh James M.Tiedje Stefan J.Green Joel E.Kostka Peter K.Kitanidis Philip M.Jardme CraigS.Criddle 美国斯坦福大学土木与环境工程系 StanfordCA94305USA 美国橡树岭国家实验室环境科学部 OakRidgeTN37831USA 美国阿岗国家实验室生物科学部 ArgonneIL60439USA 美国俄克拉荷马大学植物-与微生物学系 NormanOK73019USA 广东省微生物研究所广州510070 美国乔冶亚理工学院土木与环境工程系 AtlantaGA30332USA 美国密歇根州立大学微生物生态中心 EastLansingMI48823USA 美国蒙大拿州立大学生物膜工程中心 BozemanMT59717USA 美国佛罗里达州立大学地球海洋大气科学系 TallahasseeFL32306USA 美国田纳西大学生物系统工程与土壤科学系 KnoxvilleTN37996USA

总结了美国斯坦福大学和橡树岭国家实验室等在美国能源部田纳西州橡树岭综合试验基地进行的铀污染原位微生物修复阶段性试验结果.本试验利用微生物以乙醇为电子供体还原地下水和沉积物中的六价铀为不溶解的四价铀,使之原位固定化.随后... 详细信息

总结了美国斯坦福大学和橡树岭国家实验室等在美国能源部田纳西州橡树岭综合试验基地进行的铀污染原位微生物修复阶段性试验结果.本试验利用微生物以乙醇为电子供体还原地下水和沉积物中的六价铀为不溶解的四价铀,使之原位固定化.随后通过加入溶解氧和硝酸盐来试验微生物还原后的地下水层中还原固定态铀的稳定性.通过预处理和长期间隔注入乙醇溶液,地下水中铀浓度从40～60mg·L-1降至0.03mg·L-1以下,达到了美国环保署饮用水的标准.还原的四价铀主要以U(Ⅳ)-Fe复合物的形态存在.结果表明,固定化后的四价铀只有在厌氧条件下才是稳定的,溶解氧和硝酸盐侵入地下水层后会使固定化的四价铀重新氧化为溶解态的六价铀.在试验过程中,采用多种分子生物学方法检测了微生物种群的变化和与铀氧化还原反应有关的功能微生物.本研究表明,在维持试验系统无氧和无硝酸盐的条件下,通过添加乙醇为电子供体可有效地促进地下水中土著功能微生物的活性,从而实现铀的原位还原固定与稳定.

关键词：铀污染微生物还原原位生物修复地下水沉积物

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Foaming supramolecular surfactants for gas mobility control in naturally fractured carbonate reservoirs at high temperature,salinity,and hardness

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Petroleum Science 2022年第6期19卷 3134-3148页

作者： Enrique Soto-Castruita Raúl Hern andez-Altamirano Eduardo Buenrostro-González erick-Emanuel Luna-Rojero Sung Jae Ko-Kim Violeta-Yasmín Mena-Cervantes Mirna Pons-Jiménez Jorge-Francisco Ramírez-Pérez David-Aaσn Nieto-Alvarez Ricardo Cerón-Camacho Jos e-Ernesto Parra Raúl Oviedo-Roa Jos e-Manuel Martínez-Magadán Rodolfo Cisneros-Dévora Luis-S.Zamudio-Rivera Instituto Mexicano del Petr oleo Eje Central Lazaro Cardenas Norte 152Col.San Bartolo AtepehuacanCiudad de Mexico07730Mexico CONACy T-Instituto Mexicano del Petroleo Eje Central Lazaro Cardenas Norte 152Col.San Bartolo AtepehuacanCiudad de Mexico07730Mexico Centro Mexicano para la Produccion mas Limpia Instituto Politecnico NacionalAvenida Acueducto s/nCol.La Laguna TicomanCiudad de Mexico07340Mexico Centro de Tecnologías para Exploracion y Produccion Camino de Terracería 800Col.San Jose NovilleroBoca delRíoVeracruz94286Mexico

Oil production and mainte nance are essential issues in naturally fractured reservoirs because they are the largest and most productive on ***,they present early water and gas channeling but could be remediated by using foaming agents to control these phenomena through blocking channeling *** Mexico these reservoirs have pressure up to 5,500 psi,high temperature up to 200℃,salinity up to400,000 ppm,and hardness up to 250,000 ppm;due to these thermodynamic conditions,there has been no available technology to form stable enough *** this work,a foaming supramolecular surfactant with the capability to chelate Ca^(2+)ions is *** a result,surfactant monomers are bridged by captured Ca^(2+)cations leading to the formation of high-molecular-weight oligomers,which significantly increment the viscosity of the solution improving the foam stability,and since at this manner the Ca2+cations are no longer available to precipitate as components of solid salts,the foaming supramolecular surfactant also performs as *** observations are explained through quantum theoretical *** foam is stable,effectively blocking the gas channels,whereas in presence of oil the foam is broken leading the oil to pass into the *** characteristic rheological properties of the foam allow its injection into the formation at a range of flow rates,foam qualities,and shear stress to achieve the flooding and the blocking of a variety of fractured carbonate formations,and the change of the wettability of the matrix,which is a desirable behavior in a huff and puff process,as reported in a previous publication about a successful pilot test of this foam.

关键词： Calcium chelation Foaming composition Supramolecular surfactant Molecular design Gas mobility control Flow assurance Improved oil recovery Conformance control

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