J. Martins

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Gjergj Dodbiba

The University of Tokyo

Anamika Kushwaha

Motilal Nehru National Institute of Technology

Olubukola Oluranti Babalola

North-West University

Thomas Pümpel

University of Innsbruck

Marios Tsezos

National Technical University of Athens

abhishek mishra

Suresh Gyan Vihar University

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Papers by J. Martins

Facilitated transport of heavy metals by bacterial colloids in sand columns

Journal de Physique IV (Proceedings), 2003

The aim of this work is to evaluate the ability of biotic collois (e. g. bacterial cells) to faci... more The aim of this work is to evaluate the ability of biotic collois (e. g. bacterial cells) to facilitate the transport of heavy metals in soils. and to identify the main factors influencing colloid transport in order to detelmine the geo-chemical conditions where this secondary transport process may become dominant. The model colloids studied here are living cells of Escherichia coli and Ralstonia metallidurans. We studied the transport of mercury zinc, and cadmium in columns of Fontainebleau sand. The properties (i. e. optical and morphological properties, charge (zêta potentia), Q and hydrophobia (water/hexadecane distribution parameter, Khw)) of the bacterial cells surface were characterised, as well as their potential for heavy metals sorption (kinetic and isotherm). Both surface charge (C=-54 and-14 mV) and hydrophobia (Kh, = 0. 25 and 0. 05) differ strongly for the two bacteria. Column studies were conducted with bacteria and heavy metals separately or simultaneously. The cell surface differences led to different transport behaviour of the two bacteria, although the retardation factor is close to 1 for both. We observed that colloid mobility increases when increasing bacterial cells concentration and when decreasing the ionic strength. We also observed that bacterial colloids appeared as excellent vectors for Hg, Zn and Cd. Indeed, heavy metals adsorbed on the Fontainebleau sand when injected alone in columns (retardation factors of 1. 4 ; 2. 9 and 3. 8 for Hg, Zn and Cd, respectively) ; whereas no retardation (R= 1) is observed when injected in the presence of both bactelia. Moreover, transport of bio-sorbed metal appears to be 4 to 6 times higher than dissolved heavy-ruetal.

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Effect of cultivation and experimental conditions on the surface reactivity of the metal-resistant bacteria Cupriavidus metallidurans CH34 to protons, cadmium and zinc

Chemical Geology, 2007

Effect of cultivation and experimental conditions on the surface reactivity of the metal-resistan... more

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Experimental investigation of biofilm growth and hydrodynamic/biomass interaction in a granular bioreactor

by Philippe Sechet, Christian Geindreau, and J. Martins

Microbiogéochimie, transfert réactif et impact des micropolluants dans les sols. Approche couplée multi-échelles et modélisation

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Comparison of in situ performance-based tests methods to evaluate moduli of railway embankments

Proceedings of the 8th International Conference (BCR2A'09), June 29 - July 2 2009, Unversity of Illinois at Urbana - Champaign, Champaign, Illinois, USA, 2009

Abstract: Compaction control based on performance-based test methods has been used recently. Thes... more

Zinc Sorption to Three Gram-Negative Bacteria: Combined Titration, Modeling, and EXAFS Study

by Cécile Delolme, G. Sarret, L. Spadini, and J. Martins

Environmental Science & Technology, 2006

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Effect of pine bark and compost on the biological denitrification process of non-hazardous landfill leachate: Focus on the microbiology

by J. Martins, Frédéric Coulon, and Cristina Trois

Journal of Hazardous Materials, 2010

In an attempt to optimize the cost-efficiency of landfill leachate treatment by biological denitr... more In an attempt to optimize the cost-efficiency of landfill leachate treatment by biological denitrification process, our study focused on finding low-cost alternatives to traditional expensive chemicals such as composted garden refuse and pine bark, which are both available in large amount in South African landfill sites. The overall objective was to assess the behaviour of the bacterial community in relation to each substrate while treating high strength landfill leachates. Denitrification processes in fixed bed reactors were simulated at laboratory scale using anaerobic batch tests with immature compost and pine bark. High strength leachate was simulated using a solution of water and nitrate at a concentration of 500 mg l -1 . Results suggest that pine bark released large amounts of phenolic compounds and hydroxylated benzene rings, which both can delay the acclimatization time and inhibit the biological denitrification (only 30% efficiency).

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Mechanisms of metal (loïd) s accumulation and detoxification in bacteria and plants using synchrotron techniques

by L. Spadini and J. Martins

Facilitated transport of heavy metals by bacterial colloids in sand columns

Journal de Physique IV (Proceedings), 2003

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Effect of cultivation and experimental conditions on the surface reactivity of the metal-resistant bacteria Cupriavidus metallidurans CH34 to protons, cadmium and zinc

Chemical Geology, 2007

Effect of cultivation and experimental conditions on the surface reactivity of the metal-resistan... more

Download

Experimental investigation of biofilm growth and hydrodynamic/biomass interaction in a granular bioreactor

by Philippe Sechet, Christian Geindreau, and J. Martins

Microbiogéochimie, transfert réactif et impact des micropolluants dans les sols. Approche couplée multi-échelles et modélisation

Download

Comparison of in situ performance-based tests methods to evaluate moduli of railway embankments

Proceedings of the 8th International Conference (BCR2A'09), June 29 - July 2 2009, Unversity of Illinois at Urbana - Champaign, Champaign, Illinois, USA, 2009

Abstract: Compaction control based on performance-based test methods has been used recently. Thes... more

Zinc Sorption to Three Gram-Negative Bacteria: Combined Titration, Modeling, and EXAFS Study

by Cécile Delolme, G. Sarret, L. Spadini, and J. Martins

Environmental Science & Technology, 2006

Download

Effect of pine bark and compost on the biological denitrification process of non-hazardous landfill leachate: Focus on the microbiology

by J. Martins, Frédéric Coulon, and Cristina Trois

Journal of Hazardous Materials, 2010

Download

Mechanisms of metal (loïd) s accumulation and detoxification in bacteria and plants using synchrotron techniques

by L. Spadini and J. Martins

J. Martins

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