The Experts below are selected from a list of 255 Experts worldwide ranked by ideXlab platform
Eric Dumont - One of the best experts on this subject based on the ideXlab platform.
-
steady and transient state h2s biofiltration using expanded Schist as packing material
New Biotechnology, 2013Co-Authors: A Romero C Hernandez, M Rodriguez S Susa, Yves Andres, Eric DumontAbstract:The performances of three laboratory-scale biofilters (BF1, BF2, BF3) packed with expanded Schist for H 2 S removal were studied at different empty bed residence times (EBRT = 35, 24 and 16 s) in terms of elimination capacity (EC) and removal efficiency (RE). BF1 and BF2 were filled with expanded Schist while BF3 was filled with both expanded Schist and a nutritional material (UP20; 12% vol). BF1 and BF3 were inoculated with activated sludge, whereas BF2 was not inoculated. A maximum EC of 42 g m −3 h −1 was recorded for BF3 at EBRT = 35 s demonstrating the ability of Schist to treat high H 2 S loading rates, and the ability of UP20 to improve H 2 S removal. Michaelis–Menten and Haldane models were fitted to the experimental elimination capacities while biofilter responses to transient-state conditions in terms of removal efficiency during shock load events were also evaluated for BF1 and BF3.
-
h2s biofiltration using expanded Schist as packing material performance evaluation and packed bed tortuosity assessment
Journal of Chemical Technology & Biotechnology, 2012Co-Authors: Eric Dumont, M Rodriguez S Susa, L Ayala M Guzman, Yves AndresAbstract:BACKGROUND: The aim of this work was to test an innovative packing material (expanded Schist) for H2S biofiltration in order to determine the packing material performance in terms of elimination capacity, removal efficiency and pressure drop changes.Additionally,thechangesovertimeofbedcharacteristics,especiallytortuosity,wereevaluatedaccordingtoporosity measurements. RESULTS:Schistmaterialcantreatlargeloadingrates(upto30 g.m −3 .h −1 )with100%efficiencyatanemptybedresidencetime (EBRT) of 16 s, which is much better than most results reported in the literature. The porosity of the packed bed is around 40% (tortuosity estimated to range from 1.5 to 2.0) which leads to pressure drop measurements in the range of 10‐80 Pa m −1 . CONCLUSION: Schist is a good material for H2S biofiltration in terms of mechanical stability, removal efficiency and effective treatment of high H2S loading rates. Schist is a material that provides the appropriate environment for micro-organisms by itself. This trend should be confirmed over a long period. c � 2012 Society of Chemical Industry
Yves Andres - One of the best experts on this subject based on the ideXlab platform.
-
steady and transient state h2s biofiltration using expanded Schist as packing material
New Biotechnology, 2013Co-Authors: A Romero C Hernandez, M Rodriguez S Susa, Yves Andres, Eric DumontAbstract:The performances of three laboratory-scale biofilters (BF1, BF2, BF3) packed with expanded Schist for H 2 S removal were studied at different empty bed residence times (EBRT = 35, 24 and 16 s) in terms of elimination capacity (EC) and removal efficiency (RE). BF1 and BF2 were filled with expanded Schist while BF3 was filled with both expanded Schist and a nutritional material (UP20; 12% vol). BF1 and BF3 were inoculated with activated sludge, whereas BF2 was not inoculated. A maximum EC of 42 g m −3 h −1 was recorded for BF3 at EBRT = 35 s demonstrating the ability of Schist to treat high H 2 S loading rates, and the ability of UP20 to improve H 2 S removal. Michaelis–Menten and Haldane models were fitted to the experimental elimination capacities while biofilter responses to transient-state conditions in terms of removal efficiency during shock load events were also evaluated for BF1 and BF3.
-
h2s biofiltration using expanded Schist as packing material performance evaluation and packed bed tortuosity assessment
Journal of Chemical Technology & Biotechnology, 2012Co-Authors: Eric Dumont, M Rodriguez S Susa, L Ayala M Guzman, Yves AndresAbstract:BACKGROUND: The aim of this work was to test an innovative packing material (expanded Schist) for H2S biofiltration in order to determine the packing material performance in terms of elimination capacity, removal efficiency and pressure drop changes.Additionally,thechangesovertimeofbedcharacteristics,especiallytortuosity,wereevaluatedaccordingtoporosity measurements. RESULTS:Schistmaterialcantreatlargeloadingrates(upto30 g.m −3 .h −1 )with100%efficiencyatanemptybedresidencetime (EBRT) of 16 s, which is much better than most results reported in the literature. The porosity of the packed bed is around 40% (tortuosity estimated to range from 1.5 to 2.0) which leads to pressure drop measurements in the range of 10‐80 Pa m −1 . CONCLUSION: Schist is a good material for H2S biofiltration in terms of mechanical stability, removal efficiency and effective treatment of high H2S loading rates. Schist is a material that provides the appropriate environment for micro-organisms by itself. This trend should be confirmed over a long period. c � 2012 Society of Chemical Industry
Alan Cooper - One of the best experts on this subject based on the ideXlab platform.
-
Structural evolution of the semiSchist–Schist transition in an accretionary complex: the Otago Schist section at Lake Hāwea, New Zealand
New Zealand Journal of Geology and Geophysics, 2017Co-Authors: Alan Cooper, Richard J. NorrisAbstract:ABSTRACTPermo-Triassic, Rakaia Terrane, pelitic and psammitic Schists at Lake Hāwea, Otago, show progressive metamorphism from TZII, pumpellyite–actinolite facies to TZIV, greenSchist facies. The sequence shows evidence of five phases of deformation. D1 and D2 are progressive synmetamorphic phases, forming macroscopic nappe-like folds, interpreted to have formed by internal deformation within the Rakaia–Caples accretionary wedge during terrane collision. Thick S1 quartz veins are the form surface for definition of D2 folding, intensification of which progressively destroys evidence of D1 at higher textural and metamorphic grades. D3–5 are post metamorphic, less pervasive, kink folds (commonly conjugate) and brittle fault zones that predate the intrusion of lamprophyre magma and carbonatitic fluids associated with the Alpine Dike Swarm (c. 25 Ma). They relate to tectonic relaxation and exhumation of the Schist in Cretaceous–Paleogene times. Fluid flow has been ubiquitous throughout the deformation, resulti...
-
new p t and u pb constraints on alpine Schist metamorphism in south westland new zealand
New Zealand Journal of Geology and Geophysics, 2015Co-Authors: James M Scott, A Auer, Janet R Muhling, T A Czertowicz, Alan Cooper, M A Billia, Allen KennedyAbstract:Metamorphic mineral compositions of a staurolite-bearing greySchist from the middle reaches of the Moeraki River valley in south Westland reveal peak equilibration at c. 558 ± 50 °C and c. 6.1 ± 1.2 kbar. Two c. 83 Ma U–Pb monazite age populations from the cores of monazite-apatite-allanite-epidote corona structures in mylonitised Schists from near Fox Glacier confirm that Alpine Schist metamorphism occurred during the Late Cretaceous. The published spread in Late Cretaceous metamorphic ages indicates that metamorphism was diachronous or was a protracted event. Further dating is required to pin down the cryptic transition into the Jurassic–Early Cretaceous metamorphosed Otago Schist, but the Alpine Schist must extend at least 11 km east of the Alpine Fault in south Westland and overprint the suture between the Pounamu and Rakaia terranes. The P–T–t results imply that the Late Cretaceous crust represented by portions of the Alpine Schist was probably of similar thickness to that beneath the Southern Alps t...
-
the pounamu terrane a new cretaceous exotic terrane within the alpine Schist new zealand tectonically emplaced deformed and metamorphosed during collision of the lip hikurangi plateau with zealandia
Gondwana Research, 2015Co-Authors: Alan Cooper, T R IrelandAbstract:Abstract The petrologically renowned Haast Schist, previously acknowledged as having formed by Jurassic collision and amalgamation of the exotic Rakaia and indigenous Caples terranes during late Mesozoic orogenesis, contains a component of the Alpine Schist whose protolith was deposited in the mid-Cretaceous. An air-fall tuff deposited on the ophiolitic Pounamu Ultramafic Belt (PUB) has an eruption age of 108 Ma. The PUB is in tectonic contact to the east with Rakaia terrane-derived Alpine Schist of Triassic age and is overlain by turbiditic metasediments that have Cretaceous (109–140 Ma) detrital zircon populations. The dominant zircon component of these sediments is Permo-Triassic, compatible with autocannibalistic reworking from the Torlesse Composite terrane. Reconnaissance analysis of the Alpine Schist indicates that Cretaceous protoliths extend at east 200 km along strike, while possible correlatives elsewhere in New Zealand suggest that the original basin may have been thousands of kilometres in extent. Models for the emplacement of these exotic Cretaceous sediments, the proposed Pounamu terrane, are explored. Our favoured interpretation is that the Cretaceous Alpine Schist protoliths were deposited in an ensimatic sedimentary basin north of earlier Mesozoic subduction zones. Multi-phase deformation and metamorphism occurred during collision of the LIP Hikurangi Plateau with Zealandia, resulting in the emplacement of an ophiolite (PUB)-soled allochthonous thrust sheet of the Pounamu terrane onto the previously metamorphosed Rakaia–Otago Schist–Caples massif. Based on new and regional evidence, this collision and the climactic metamorphism of the Pounamu terrane occurred at ~ 72 Ma.
-
cretaceous sedimentation and metamorphism of the western alpine Schist protoliths associated with the pounamu ultramafic belt westland new zealand
New Zealand Journal of Geology and Geophysics, 2013Co-Authors: Alan Cooper, T R IrelandAbstract:The Pounamu Ultramafic Belt (PUB), part of the Alpine Schists, comprises a metamorphosed ophiolitic sequence overlain by a thin pelagic unit, a massive quartzofeldspathic biotite rock and quartzofeldspathic turbidites derived from a Torlesse/Otago Schist source. Constituent zircon populations from the biotite rock are euhedral/prismatic and are unabraded. One sample is near unimodal, with a U–Pb SHRIMP age of 106.6±1.4 Ma (2σm), while the other has two peaks at 108.0±1.6 Ma and 71.9±1.8 Ma. The older age is interpreted to represent the age of igneous activity and sedimentation, while the younger peak is interpreted to represent the age of subsequent metamorphism. The whole-rock geochemistry of the biotite rock, its field distribution and zircon morphology are consistent with an origin by eruption of a dacitic air-fall tuff. The base of the Pounamu sequence divides predominantly psammitic Triassic metasediments to the east from intensely deformed, but regionally west-facing, Cretaceous metasediments to the...
M Rodriguez S Susa - One of the best experts on this subject based on the ideXlab platform.
-
steady and transient state h2s biofiltration using expanded Schist as packing material
New Biotechnology, 2013Co-Authors: A Romero C Hernandez, M Rodriguez S Susa, Yves Andres, Eric DumontAbstract:The performances of three laboratory-scale biofilters (BF1, BF2, BF3) packed with expanded Schist for H 2 S removal were studied at different empty bed residence times (EBRT = 35, 24 and 16 s) in terms of elimination capacity (EC) and removal efficiency (RE). BF1 and BF2 were filled with expanded Schist while BF3 was filled with both expanded Schist and a nutritional material (UP20; 12% vol). BF1 and BF3 were inoculated with activated sludge, whereas BF2 was not inoculated. A maximum EC of 42 g m −3 h −1 was recorded for BF3 at EBRT = 35 s demonstrating the ability of Schist to treat high H 2 S loading rates, and the ability of UP20 to improve H 2 S removal. Michaelis–Menten and Haldane models were fitted to the experimental elimination capacities while biofilter responses to transient-state conditions in terms of removal efficiency during shock load events were also evaluated for BF1 and BF3.
-
h2s biofiltration using expanded Schist as packing material performance evaluation and packed bed tortuosity assessment
Journal of Chemical Technology & Biotechnology, 2012Co-Authors: Eric Dumont, M Rodriguez S Susa, L Ayala M Guzman, Yves AndresAbstract:BACKGROUND: The aim of this work was to test an innovative packing material (expanded Schist) for H2S biofiltration in order to determine the packing material performance in terms of elimination capacity, removal efficiency and pressure drop changes.Additionally,thechangesovertimeofbedcharacteristics,especiallytortuosity,wereevaluatedaccordingtoporosity measurements. RESULTS:Schistmaterialcantreatlargeloadingrates(upto30 g.m −3 .h −1 )with100%efficiencyatanemptybedresidencetime (EBRT) of 16 s, which is much better than most results reported in the literature. The porosity of the packed bed is around 40% (tortuosity estimated to range from 1.5 to 2.0) which leads to pressure drop measurements in the range of 10‐80 Pa m −1 . CONCLUSION: Schist is a good material for H2S biofiltration in terms of mechanical stability, removal efficiency and effective treatment of high H2S loading rates. Schist is a material that provides the appropriate environment for micro-organisms by itself. This trend should be confirmed over a long period. c � 2012 Society of Chemical Industry
Allen Kennedy - One of the best experts on this subject based on the ideXlab platform.
-
new p t and u pb constraints on alpine Schist metamorphism in south westland new zealand
New Zealand Journal of Geology and Geophysics, 2015Co-Authors: James M Scott, A Auer, Janet R Muhling, T A Czertowicz, Alan Cooper, M A Billia, Allen KennedyAbstract:Metamorphic mineral compositions of a staurolite-bearing greySchist from the middle reaches of the Moeraki River valley in south Westland reveal peak equilibration at c. 558 ± 50 °C and c. 6.1 ± 1.2 kbar. Two c. 83 Ma U–Pb monazite age populations from the cores of monazite-apatite-allanite-epidote corona structures in mylonitised Schists from near Fox Glacier confirm that Alpine Schist metamorphism occurred during the Late Cretaceous. The published spread in Late Cretaceous metamorphic ages indicates that metamorphism was diachronous or was a protracted event. Further dating is required to pin down the cryptic transition into the Jurassic–Early Cretaceous metamorphosed Otago Schist, but the Alpine Schist must extend at least 11 km east of the Alpine Fault in south Westland and overprint the suture between the Pounamu and Rakaia terranes. The P–T–t results imply that the Late Cretaceous crust represented by portions of the Alpine Schist was probably of similar thickness to that beneath the Southern Alps t...