Role of microbial accumulation in biological sulphate reduction using lactate as electron donor in an inversed fluidized bed bioreactor: Operation and dynamic mathematical modelling

2017 ◽  
Vol 121 ◽  
pp. 1-10 ◽  
Author(s):  
J. Cassidy ◽  
L. Frunzo ◽  
H.J. Lubberding ◽  
D.K. Villa-Gomez ◽  
G. Esposito ◽  
...  
Keyword(s):  
Mathematical Modelling ◽  
Fluidized Bed ◽  
Electron Donor ◽  
Sulphate Reduction ◽  
Fluidized Bed Bioreactor ◽  
Bioreactor Operation

Lignocellulosic biowastes as carrier material and slow release electron donor for sulphidogenesis of wastewater in an inverse fluidized bed bioreactor

2017 ◽  
Vol 25 (6) ◽  
pp. 5115-5128 ◽  
Author(s):  
Luis C. Reyes-Alvarado ◽  
Álvaro Camarillo-Gamboa ◽  
Elena Rustrian ◽  
Eldon R. Rene ◽  
Giovanni Esposito ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Electron Donor ◽  
Slow Release ◽  
Fluidized Bed Bioreactor ◽  
Carrier Material ◽  
Inverse Fluidized Bed

The role of sulphate reduction on the reductive decolorization of the azo dye reactive orange 14

2006 ◽  
Vol 54 (2) ◽  
pp. 171-177 ◽  
Author(s):  
F.J. Cervantes ◽  
J.E. Enriquez ◽  
M.R. Mendoza-Hernandez ◽  
E. Razo-Flores ◽  
J.A. Field
Keyword(s):  
Electron Donor ◽  
Azo Dye ◽  
Redox Mediator ◽  
Sulphate Reduction ◽  
Anaerobic Sludge ◽  
Biological Mechanisms ◽  
Azo Reduction ◽  
Reactive Orange ◽  
The Impact

The aim of this study was to investigate the impact of a broad range of sulphate concentrations (0–10 g SO4−2 L−1) on the reduction of an azo dye (reactive orange 14 (RO14)) by an anaerobic sludge. An increase in the sulphate concentration generally stimulated the reduction of RO14 by sludge incubations supplemented with glucose, acetate or propionate as electron donor. Sulphate and azo dye reductions took place simultaneously in all incubations. However, there was a decrease on the rate of decolorization when sulphate was supplied at 10 g SO4−2 L−1. Abiotic incubations at different sulphide concentrations (0–2.5 g sulphide L−1) promoted very poor reduction of RO14. However, addition of riboflavin (20 μM), as a redox mediator, accelerated the reduction of RO14 up to 44-fold compared to a control lacking the catalyst. Our results indicate that sulphate-reduction may significantly contribute to the reduction of azo dyes both by biological mechanisms and by abiotic reductions implicating sulphide as an electron donor. The contribution of abiotic decolorization by sulphide, however, was only significant when a proper redox mediator was included. Our results also revealed that sulphate-reduction can out-compete with azo reduction at high sulphate concentrations leading to a poor decolorising performance when no sufficient reducing capacity is available.

Hydrodynamics and mathematical modelling in a low HRT inverse fluidized-bed reactor for biological sulphate reduction

2018 ◽  
Vol 41 (12) ◽  
pp. 1869-1882 ◽  
Author(s):  
Luis C. Reyes-Alvarado ◽  
Artin Hatzikioseyian ◽  
Eldon R. Rene ◽  
Eric Houbron ◽  
Elena Rustrian ◽  
...  
Keyword(s):  
Mathematical Modelling ◽  
Fluidized Bed ◽  
Fluidized Bed Reactor ◽  
Sulphate Reduction ◽  
Inverse Fluidized Bed

scholarly journals The role of nitrogen gas in fluidized bed reactors on the nodular iron nitridation processs

2021 ◽  
Vol 1034 (1) ◽  
pp. 012172
Author(s):  
Wayan Sujana ◽  
Komang Astana Widi ◽  
Gerald A. Pohan ◽  
Tutut Nani Prihatmi ◽  
Luh Dina Ekasari
Keyword(s):  
Fluidized Bed ◽  
Fluidized Bed Reactors ◽  
Nitrogen Gas ◽  
Nodular Iron

Study of the Role of Small Additions of Zr in the CVD- FBR Aluminization Process

2009 ◽  
Vol 289-292 ◽  
pp. 293-300
Author(s):  
L. Sánchez ◽  
F.J. Bolívar ◽  
M.P. Hierro ◽  
F.J. Pérez
Keyword(s):  
Fluidized Bed ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Fluidized Bed Reactor ◽  
Iron Aluminide ◽  
Martensitic Steels ◽  
Aluminide Coatings ◽  
Deposition Parameters ◽  
Zirconium Powder

In this work, iron aluminide coatings were developed by Chemical Vapor Deposition in Fluidized Bed Reactor (CVD-FBR) on ferritic-martensitic steels. Small additions of zirconium powder were introduced in the fluidized bed; as a consequence, the obtained coatings are thicker than that without zirconium additions. When Zr powders are added in the fluidized bed, the deposition atmosphere drastically changes, leading to increase the deposition rate. Thermodynamic calculations were carried out to simulate the modifications in the CVD atmosphere in the Al/Zr deposition system in comparison to the single aluminization. In order to optimize the conditions of the deposition, parameters such as temperature and concentration of zirconium introduced into the bed were evaluated and compared with the results obtained for the single aluminum deposition.

Preponderant role of pentafluorophenyl moieties for tuning the electronic properties of extended benzodifuran-azomethine derivatives

2021 ◽  
Author(s):  
Chady Moussallem ◽  
Magali Allain ◽  
Frédéric Gohier ◽  
Pierre Frere
Keyword(s):  
Electronic Properties ◽  
Electron Donor ◽  
Electron Acceptor

From a central 3,7-bis(perfluorophenyl)-BDF unit, the extension performed with electron acceptor perfluorophenyl groups and/or electron donor N,N-dimethylamino groups via an imine link leads to symmetrical AAA and DAD or dissymmetrical...

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