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Ostrava, Czech Republic

Jiang S.,Gwangju Institute of Science and Technology | Ho C.T.,Gwangju Institute of Science and Technology | Ho C.T.,Institute of Environmental Technology | Lee J.-H.,Pacific Northwest National Laboratory | And 3 more authors.
Chemosphere | Year: 2012

Shewanella putrefaciens 200, resistant to high concentration of Hg(II), was selected for co-removal of mercury and selenium from aqueous medium. Biogenic Hg(0) reduced from Hg(II) by S. putrefaciens 200 was captured into extracellular amorphous selenium nanospheres, resulting in the formation of stable HgSe nanoparticles. This bacterial reduction could be a new strategy for mercury removal from aquatic environments without secondary pollution of mercury methylation or Hg(0) volatilization. © 2012 Elsevier Ltd. Source

Lefebvre J.-P.,Institute Of Recherche Pour Le Developpement | Lefebvre J.-P.,Hanoi University of Science | Mari X.,Institute Of Recherche Pour Le Developpement | Do T.P.T.,Institute of Environmental Technology | Chu T.V.,Institute of Marine Environment and Resources
Proceedings of the Coastal Engineering Conference | Year: 2014

Transparent exopolymer particles (TEP) are widely recognized to promote sediment aggregation in eutrophic environments. Flocculation in presence of TEP of various suspended sediment concentrations of material sampled on the bank of the Cam River was quantified at the laboratory for turbulence level consistent with slack water and mid ebb conditions measured in the Cam River estuary during dry season of 2009. Stickiness and concentrations of TEP were let to naturally fluctuate by incubation (aging in the dark) for up to nine days. We found that the impact of turbulence on overall buoyancy of TEP-governed aggregation was always opposite between slack water and mid ebb conditions for any duration of incubation; always negative for slack water conditions but for 126 hours of incubation and significantly negative for mid ebb conditions but for 126 hours of incubation. Suspended sediment concentration (SSC) consistently limited aggregates buoyancy, negative or positive. We propose a conceptual model that relates measured and inferred parameters to observed hydrosedimentary processes. Source

Fujikawa Y.,Kyoto University | Hung D.,Institute of Environmental Technology | Sugahara M.,Osaka Sangyo University | Iwasaki H.,Osaka Sangyo University | And 2 more authors.
Understanding the Geological and Medical Interface of Arsenic, As 2012 - 4th International Congress: Arsenic in the Environment | Year: 2012

We conducted the pilot test of biological filtration in Hanoi, Vietnam. Arsenite [As(III)] is a chemical species diffcult to remove if not converted to arsenate [As(V)], and 90% of arsenic (As) in the well water there was As(III). However, our system was able to treat As with no-preoxidation step by the average removal exceeding 80%. © 2012 Taylor & Francis Group. Source

Kubonova L.,Institute of Environmental Technology | Fridrichova D.,Institute of Environmental Technology | Fridrichova D.,Energy Units for Utilization of Non Traditional Energy Sources | Peikertova P.,Institute of Environmental Technology | And 7 more authors.
NANOCON 2015 - 7th International Conference on Nanomaterials - Research and Application, Conference Proceedings | Year: 2015

Three different ordered mesoporous silica materials, such as MCM-41, Al containing MCM-41 (mass ratio Si/Al = 10) and SBA-15, were prepared. In a next step, cobalt (5-8 wt%) as an active metal for redox reactions, was introduced by the impregnation. The prepared catalysts were characterized by AAS, EDX, N2 physisorption, XRD, DR UV-Vis spectroscopy, Raman spectroscopy, TPR-H2 and their catalytic properties were evaluated for N2O decomposition and reduction. The catalysts showed poor activity in N2O decomposition while the use of reducing agent (carbon monoxide) was beneficial for their catalytic activities. The lowest catalytic activity showed Co/Al-MCM indicating that the aggregated CoxOy species present in this catalyst were inactive and not beneficial for the catalytic activity. Source

Ngo P.-T.,French National Institute for Agricultural Research | Ngo P.-T.,Institute of Environmental Technology | Rumpel C.,French National Institute for Agricultural Research | Thu T.D.,French National Institute for Agricultural Research | And 4 more authors.
Carbon Management | Year: 2014

Background: Exogenous organic matter may be valuable amendments for degraded tropical soil in Northern Vietnam. Their effect on carbon storage and composition need to be evaluated.Method: The study investigates soil from mesocosms cultivated with maize and amended with four different kinds of amendments: only mineral fertilizers (control), buffalo manure, compost or vermicompost as well as biochar.Results: All organic amendments showed a positive effect on soil carbon storage and significantly influenced soil organic matter quality. The presence of biochar increased lignin-derived compounds abundance as well as both plant and microbial sugar content of soil amended with vermicompost but had no effect in the case of control soil.Conclusion: Synergistic effects between plants and different organic amendments influence carbon storage and soil organic matter composition. © 2014 Taylor & Francis. Source

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