Influence of operational parameters over biomass growth and decay kinetic constants on membrane bioreactors

2013 ◽  
Vol 51 (25-27) ◽  
pp. 4847-4854 ◽  
Author(s):  
L.M. Ruiz ◽  
J. Pérez ◽  
M.A. Gómez
Keyword(s):  
Decay Kinetic ◽  
Membrane Bioreactors ◽  
Kinetic Constants ◽  
Biomass Growth ◽  
Operational Parameters

scholarly journals EVALUATION OF KINETIC CONSTANTS AND TRANSPORT EFFICIENCIES AT MEMBRANE INTERFACES TO OPTIMIZE Co(II) RECOVERY BY BULK LIQUID MEMBRANES

2018 ◽  
Vol 48 (1) ◽  
pp. 51-55
Author(s):  
G. LEÓN ◽  
M. GÓMEZ ◽  
M. A. GUZMÁN ◽  
B. MIGUEL
Keyword(s):  
Transport Mechanism ◽  
Kinetic Constants ◽  
Bulk Liquid ◽  
Liquid Membranes ◽  
Environment And Public Health ◽  
Phase Volume ◽  
Product Phase ◽  
Operational Parameters ◽  
Counter Ions ◽  
Membrane Interfaces

The harms of heavy metals to the environment and public health joined to their character of valuable resource, have lead to an increasing interest in the search of efficient processes for their removal/recovery. In this paper we study the optimization of cobalt(II) recovery by bulk liquid membranes through a carrier facilitated counter transport mechanism, using DP8R as carrier and H2SO4 as stripping agent (protons as counter-ions), by analyzing the influence of different operational parameters (carrier concentration in the membrane, stripping agent concentration in the product phase, stirring rate and organic phase volume) on both the extraction/stripping kinetic constants and the Co(II) transport efficiencies through the feed/membrane and the membrane/product interfaces.

scholarly journals Recent Progresses in Application of Membrane Bioreactors in Production of Biohydrogen

Membranes ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 100 ◽  
Author(s):  
Bahman Jabbari ◽  
Elham Jalilnejad ◽  
Kamran Ghasemzadeh ◽  
Adolfo Iulianelli
Keyword(s):  
Membrane Fouling ◽  
Low Cost ◽  
Renewable Energy Sources ◽  
Membrane Bioreactors ◽  
Pure Hydrogen ◽  
Biological Processes ◽  
Inorganic Membranes ◽  
Operational Parameters ◽  
Practical Applications ◽  
The Common

Biohydrogen is a clean and viable energy carrier generated through various green and renewable energy sources such as biomass. This review focused on the application of membrane bioreactors (MBRs), emphasizing the combination of these devices with biological processes, for bio-derived hydrogen production. Direct biophotolysis, indirect biophotolysis, photo-fermentation, dark fermentation, and conventional techniques are discussed as the common methods of biohydrogen production. The anaerobic process membrane bioreactors (AnMBRs) technology is presented and discussed as a preferable choice for producing biohydrogen due to its low cost and the ability of overcoming problems posed by carbon emissions. General features of AnMBRs and operational parameters are comprehensively overviewed. Although MBRs are being used as a well-established and mature technology with many full-scale plants around the world, membrane fouling still remains a serious obstacle and a future challenge. Therefore, this review highlights the main benefits and drawbacks of MBRs application, also discussing the comparison between organic and inorganic membranes utilization to determine which may constitute the best solution for providing pure hydrogen. Nevertheless, research is still needed to overcome remaining barriers to practical applications such as low yields and production rates, and to identify biohydrogen as one of the most appealing renewable energies in the future.

Biodegradation kinetic constants and sorption coefficients of micropollutants in membrane bioreactors

2012 ◽  
Vol 24 (2) ◽  
pp. 165-177 ◽  
Author(s):  
Eduardo Fernandez-Fontaina ◽  
Ines Pinho ◽  
Marta Carballa ◽  
Francisco Omil ◽  
Juan M. Lema
Keyword(s):  
Membrane Bioreactors ◽  
Kinetic Constants

Log removal values in membrane bioreactors: Correlation of surrogate monitoring and operational parameters

2021 ◽  
Vol 41 ◽  
pp. 102032
Author(s):  
Amos Branch ◽  
Trang Trinh ◽  
Truong Minh Ta ◽  
Greg Leslie ◽  
Pierre Le-Clech
Keyword(s):  
Membrane Bioreactors ◽  
Operational Parameters

Electron sources: Past, present, and future

1993 ◽  
Vol 51 ◽  
pp. 764-765
Author(s):  
David C Joy
Keyword(s):  
Glass Tube ◽  
Source Size ◽  
Electron Gun ◽  
Operating Parameters ◽  
Operational Parameters ◽  
Electron Sources ◽  
Difficult Decision ◽  
Probe Size ◽  
Wide Range ◽  
Overall Performance

The electron source is the most important component of the Scanning electron microscope (SEM) since it is this which will determine the overall performance of the machine. The gun performance can be described in terms of quantities such as its brightness, its source size, its energy spread, and its stability and, depending on the chosen application, any of these factors may be the most significant one. The task of the electron gun in an SEM is, in fact, particularly difficult because of the very wide range of operational parameters that may be required e.g a variation in probe size of from a few angstroms to a few microns, and a probe current which may go from less than a pico-amp to more than a microamp. This wide range of operating parameters makes the choice of the optimum source for scanning microscopy a difficult decision.Historically, the first step up from the sealed glass tube ‘cathode ray generator’ was the simple, diode, tungsten thermionic emitter.

Investigation of culture conditions by Response Surface Methodology and kinetic modeling for exopolysaccharide production by Klebsiella oxytoca ICCF 419 strain, using lactose as substrate

2020 ◽  
Vol 25 (6) ◽  
pp. 2033-2044
Author(s):  
CATERINA TOMULESCU ◽  
◽  
MIŞU MOSCOVICI ◽  
ROXANA MĂDĂLINA STOICA ◽  
GABRIEL BUJOR ALBU ◽  
...  
Keyword(s):  
Citric Acid ◽  
Klebsiella Oxytoca ◽  
Fermentation Medium ◽  
Culture Conditions ◽  
Biomass Growth ◽  
Initial Value ◽  
Substrate Consumption ◽  
Polysaccharide Production ◽  
Crude Polysaccharide ◽  
Central Composite

The objective of this work was to optimize the bioprocess parameters, using Klebsiella oxytoca ICCF 419 to obtain an exopolysaccharide based on lactose as substrate. A kinetic study was employed and Logistic and Gompertz models were applied to describe the polysaccharide production, in relation with biomass growth and substrate consumption. The RSM methodology based on Central Composite Rotatable Design was used to evaluate and optimize the effect of lactose, corn extract, KH2PO4 and citric acid concentrations as independent variables on the polysaccharide production, biomass growth and substrate consumption as the response functions. The interaction effects and optimal parameters were obtained using Design Expert Software (version 9.0.6.2). The significance of the variables and their interactions was tested by means of ANOVA analysis with a 99% confidence level. The optimum culture conditions were determined and the model prediction was compared with experimental results. At an initial value of 23.45 for the C/N in the fermentation medium, the strain produces 17.41 g/L of crude polysaccharide and 2.53 g/L dry biomass. The EPS production was significantly influenced by lactose, corn extract and KH2PO4, while the citric acid had no influence. The biomass growth was influenced by the corn extract, KH2PO4 and citric acid.

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